JP3749960B2 - Antenna humidity monitoring method, humidity monitor and humidity control device - Google Patents

Description

[0001]
[Industrial application fields]
The present invention relates to a wireless communication system in which dry air is sealed in a feed line system to an antenna such as a waveguide within a certain pressure range, and the humidity in the feed line system is kept below a certain value to prevent deterioration of the transmission characteristics. The present invention relates to a humidity monitoring method, a humidity monitoring device, and a humidity control device in humidity control to be suppressed.
[0002]
[Prior art]
Conventionally, dry air is sealed within a certain pressure range in a load that is a feeder line system for an antenna such as a waveguide in a wireless communication system, and the humidity in the load is kept below a certain value in order to prevent deterioration of transmission characteristics. In the method (refer to FIG. 1 hereafter), dry air from a supply device 44 that is a dry air supply source installed in an unmanned radio room 43 provided in a remote place close to an antenna is supplied via an air supply pipe 54. To the branch box B in the radio room 43, and branch and supply to each feed line system 56a which is a load 56 outside the radio room 43 individually connected to the branch box B by a connection pipe 55, and the load is sealed. The inside of 56 is always kept dry.
[0003]
The supply device 44 uses the compressed air from the compressor 45 that compresses and sends out air as dry air through the sorption tank 46 containing the desiccant, and supplies this dry air via the shut-off electromagnetic valve 47 and check valve 48. The dry air from the supply device 44 has a lower limit pressure value and an upper limit pressure value set by a pressure switch 49, and the dry air is supplied to the load 56 side. When the pressure is supplied to the upper limit pressure value, the shut-off electromagnetic valve 47 is shut off in response to a command from the pressure switch 49, the compressor 45 is stopped, and the pressure in the load 56 reaches the lower limit pressure value. For example, the compressor 45 is actuated by a command from the pressure switch 49, and the shut-off electromagnetic valve 47 is in a communication state to supply dry air to the load 56 side up to the upper limit pressure value.
[0004]
The reason why the dry air having a constant pressure value range is sealed in the load 56 is to prevent external moisture from entering the load 56 through a pinhole or the like. For monitoring the humidity of the dry air sealed on the side, the same desiccant as the desiccant in the sorption tank 46 is stored in the air supply port 52 of the supply device 44 or a detector K using a humidity detector is provided. I was going.
[0005]
The above-described detector K in the prior art is for monitoring the humidity of the dry air sent from the supply device 44. When a desiccant is used as the detector K, the blue desiccant is pink. If the humidity detector is used as the detector K, it is determined that the dehumidifying capacity of the desiccant in the sorption tank 46 has deteriorated due to the value of the detection output from the humidity detector. The desiccant in the sorption tank 46 is replaced with a new desiccant. When a humidity detector is used as the detector K, an alarm output is output from the alarm device 51 when the detected output exceeds a preset value. A manned monitoring station is notified of this via the terminal 53.
[0006]
That is, in the prior art, by constantly monitoring the dry air production capacity of the supply device 44 that is a dry air supply source, the load side that is a feed line system to an antenna such as a waveguide in a wireless communication system is used. The humidity was kept below a certain value to prevent deterioration of the transmission characteristics due to the humidity of the load.
[0007]
[Problems to be solved by the invention]
However, in the above-described conventional technology, the load 56 and the connection pipe 55 are installed outdoors, and the pressure in the load 56 is changed from the upper limit pressure value to the lower limit pressure by being directly exposed to the outside air and wind and rain. Due to moisture permeation in the air supply pipe 54, the connection pipe 55, and the load 56 in a sealed state over a long period in which the supply device 44 is suspended until the value is lowered, there are the following problems.
[0008]
The first is water intrusion from the leakage port generated in the load 56. In preparation for the case where a leak hole such as a pinhole is generated in the load 56, the external pressure is reduced to prevent the water from entering from the leakage port. In consideration of this, dry air is sealed in the load 56 at a constant pressure. However, when an external pressure exceeding the sealed pressure is applied due to a sudden storm or the like, moisture may enter the load 56 from the leak port.
[0009]
The second is dryness deterioration caused by maintaining the sealed state on the load 56 side over a long period of time, and the dryness inside the load 56 gradually deteriorates due to moisture permeation of the material constituting the load 56 side. In particular, drying in the load 56 is performed by moisture transmission from the air supply pipe 54 and the connection pipe 55 which are generally made of a non-metallic material having moisture absorption and moisture permeability, and packings used in each connection portion. Degree deteriorates.
[0010]
As described above, when the dryness on the load 56 side deteriorates, the air whose dryness on the load 56 side deteriorates diffuses and flows backward to the supply device 44 side, and the detector K of the supply device 44 is operated. Although the desiccant in the sorption tank 46 has not deteriorated, it is misidentified that the desiccant has deteriorated, or it is mistaken as a malfunction of the supply device 44, and a plurality of feeder lines 56 a are used as the loads 56. When connected and the load capacity is large, the above-described misidentification is likely to occur.
[0011]
Third, in order to cope with the above-described problems, the air in the load 56 needs to be replaced periodically. It depends on the airtightness, outside air conditions, the material of the air supply pipe 54 and the connection pipe 55, etc. and cannot be determined in general. As a result, it is necessary to go to a remote radio room, which requires a lot of manpower and expense, and is subject to significant restrictions on the work date and time in relation to the operation of the radio communication system. This causes a serious inconvenience of temporarily stopping transmission / reception of the wireless communication system.
[0012]
Therefore, the present invention was devised to solve the above-described problems in the prior art, and the humidity on the load side is constantly controlled without being affected by the moisture permeability on the supply device side having a low moisture permeability in the wireless room. It is a technical issue to monitor, so that humidity deterioration on the load side can be detected early and accurately, and based on the detection result, automatic replacement of the load-side humidity deterioration air with dry air is possible. The object is to improve the reliability of transmission and reception of the system and to achieve a significant reduction in the cost required to maintain the dryness within the load.
[0013]
[Means for Solving the Problems]
The first means of the present invention for solving the above technical problem is:
Humidity control in which dry air is sealed within a certain pressure range in a load that is a power supply line system for an antenna such as a waveguide in a wireless communication system, and the humidity in the load is kept below a certain value to prevent deterioration of transmission characteristics Being related to,
A humidity sensor that detects the humidity in the dry air supply line including the load and a slight amount of desiccant are placed together in the middle of the dry air supply line between the supply device that is the dry air supply source and the load. ,
Determining that the humidity in the dry air supply line including the load has deteriorated when the detection signal of the humidity sensor exceeds a preset threshold value,
The desiccant capacity of the desiccant can be dehumidified so that the moisture permeability in the dry air supply line on the supply device side does not reach the threshold value of the humidity sensor detection signal. Set the moisture so that it cannot be dehumidified until the detection signal of the humidity sensor does not reach the threshold.
It is in the humidity monitoring method.
[0014]
The second means of the present invention is:
Forms a dry air supply line to an inlet port to which an air supply pipe that forms a dry air supply line from a supply device that is a dry air supply source is connected, and a load that is a feed line system to an antenna such as a waveguide A connection port to which a connecting pipe is connected, a delivery port for discharging dry air, and When the humidity in the dry air supply line including the load is detected, and the air in the dry air supply line including the load deteriorates in humidity, the detection signal becomes equal to or higher than a preset threshold value. Make a sealed hollow body with a mounting port equipped with a humidity sensor,
In this sealed hollow body, moisture permeation moisture in the air supply pipe can be dehumidified so that the detection signal of the humidity sensor does not reach the preset threshold value. During ~ Moisture permeable moisture is stored with the desiccant set to a dehumidifying capacity that cannot be dehumidified so that the detection signal of the humidity sensor does not reach the threshold value in a state where scattering to each port is prevented,
There is a humidity monitor.
[0015]
In the second means of the present invention, the sealed hollow body is composed of a bottomed cylindrical main body cylinder and a top cylindrical cap cylinder that is closely assembled to the upper end opening of the main body cylinder, and the inlet port is In addition to being provided on the bottom wall of the main body cylinder, a delivery port and a mounting port may be provided on the cylinder wall of the main body cylinder, and a connection port may be provided on the top wall of the cap cylinder.
[0016]
The third means of the present invention is:
When the humidity in the dry air supply line including the load is detected, and the air in the dry air supply line including the load deteriorates in humidity, the detection signal becomes equal to or higher than a preset threshold value. Air supply pipe that forms a dry air supply line from a supply device that is a humidity sensor and a dry air supply source During ~ Moisture permeable moisture can be dehumidified so that the detection signal of the humidity sensor does not reach a preset threshold value, but the connection forms a dry air supply line to a load that is a feed line system to an antenna such as a waveguide Pipe side During ~ Moisture permeable moisture is connected to the inlet port of the humidity monitor that contains the desiccant set to the dehumidifying capacity that cannot be dehumidified so that the detection signal of the humidity sensor does not reach the threshold value, and the air supply pipe is connected An entrance port
Connecting the output port to which the connection pipes provided for each of the plurality of feeder lines are individually connected to the connection port of the humidity monitor individually via the manual open / close valve,
Connect the forced release port opened to the outside air to the connection port of the humidity monitor through the forced open / close valve,
Connecting the discharge port, which is also open to the outside air, to the output port of the humidity monitor via a series line of solenoid valve and regulating valve,
When the detection signal of the humidity sensor of the humidity monitor is input, and the magnitude of this detection signal exceeds a preset threshold value, an operation signal for operating the solenoid valve for a set time is output. If the detection signal of the humidity sensor is greater than or equal to the threshold value even after operation for a certain period of time, providing a control circuit unit that outputs an alarm signal,
It is in the humidity control device.
[0017]
In the third means of the present invention, it is convenient to provide an expansion port for connecting a new feeder line system as a load in parallel with the outlet port.
[0018]
Further, in the third means of the present invention, the control circuit unit includes a circuit means for outputting an operation signal when the detection signal from the humidity sensor of the humidity monitor exceeds a preset threshold value, and an input of the operation signal. The first timer is a normally open contact that has a fixed self-holding time and controls the connection with the power supply of the solenoid valve. Consists of one timer contact I and a first timer contact II, which is a normally closed contact, and a second timer has a certain operation start delay time and is connected in series with the first timer contact II to output an alarm. It is good to comprise by the 2nd timer contact which is a normally open type | mold contact which forms.
[0019]
[Action]
The humidity sensor is installed in the middle of the dry air supply line to detect the humidity in the dry air supply line including the load, so that leakage occurs in the air supply pipe and the connecting pipe forming the load and the dry air supply line. The intrusion moisture and moisture transmission moisture from the mouth are constantly monitored.
[0020]
However, this humidity sensor can dehumidify moisture permeation in the short air supply pipe forming the dry air supply line on the dry air supply device side so that the detection signal of the humidity sensor does not reach the threshold value. Moisture permeable moisture in the long connection pipe forming the dry air supply line is provided with a small amount of desiccant with dehumidifying capacity set so that it can not be dehumidified so that the detection signal of the humidity sensor does not reach the threshold value. Therefore, the humidity monitored by the humidity sensor is substantially the humidity of the dry air supply line on the load side.
[0021]
Therefore, in a normal state, the humidity sensor is not affected by a slight moisture permeable moisture in the dry air supply line on the supply device side that is close to the humidity sensor, and the long dry air supply line on the load side. The humidity will be monitored.
[0022]
A humidity monitor with a humidity sensor attached to the mounting port has an inlet port to which an air supply pipe is connected to a sealed hollow body containing a small amount of desiccant, a connection port to which the connection pipe is connected, and a delivery port. Therefore, the dry air supplied from the supply device to each feeder line system, which is a load, always passes through the humidity monitor, and the dry air supply line including the load is always inside the humidity monitor. The air is in communication, and if necessary, the dry air in the dry air supply line is discharged from the delivery port into the outside air.
[0023]
In this way, the humidity monitor equipped with the humidity sensor is always in communication with the dry air supply line, and the dry air that enters and exits the dry air supply line always passes therethrough. As a matter of course, the dry air enclosed in the supply line uses a humidity sensor to measure all the humidity of the dry air supplied from the supply device to the dry air supply line and the dry air discharged from the dry air supply line into the outside air. Will be monitored.
[0024]
Since the humidity control device has a configuration in which the input port, which is the inlet port of the humidity monitor, is piped through the humidity monitor, all dry air sent from the supply device passes through this humidity monitor. Become.
[0025]
When the humidity of the dry air sealed in the load deteriorates and the detection signal of the humidity sensor of the humidity monitor exceeds the threshold set by the control circuit, the humidity is monitored by the output of the operation signal from the control circuit. The solenoid valve connected to the discharge port of the device is opened for a set time, so that the pressure in the load does not drop rapidly below the lower limit pressure value. The humidity deteriorated air in the load is discharged from the discharge port into the outside air through an adjustment valve for adjusting the flow rate per unit time.
[0026]
When the pressure in the load reaches the lower limit pressure due to the release of humidity-degraded air in the load, the compressor is activated by the action of the pressure switch of the supply device and dry air begins to be supplied to the humidity monitor. A part of the dry air is released into the outside air through the solenoid valve, but most of it is sent to the load side where the internal pressure is reduced through the humidity monitor, and this dry air is sent to the load side. Since the atmosphere of the humidity sensor becomes dry with dry air, the value of the detection signal of the humidity sensor is below the threshold value, and this stops the output of the operation signal of the control circuit section and after a certain time has elapsed. The solenoid valve is closed and the desiccant in the humidity monitor is restored to its dehumidifying capacity by dry air.
[0027]
Even if the solenoid valve is closed, the supply of dry air from the supply device to the load side continues until the internal pressure on the load side reaches the upper limit pressure value, so that the humidity deteriorated air in the load can be replaced with dry air. Although achieved, this air change is not always accomplished in a single operation and may be repeated several times.
[0028]
The humidity sensor detection signal does not fall below the threshold value even when dry air is sent to the load side when the degree of humidity deterioration is extremely large, such as when water has accumulated in the dry air supply line on the load side. In such a case, an alarm signal is output from the control circuit to the monitoring station side by utilizing the fact that the solenoid valve is in an open state even after a set time has elapsed.
[0029]
Upon receiving the warning signal, the monitoring station goes to the site and, depending on the situation, if necessary, operates the manual open / close valve to determine which power line system has deteriorated humidity or pressure drop. It is judged that the humidity deterioration level of the load is severe due to outside air conditions such as sudden storms, etc., and the above normal dry air replacement operation cannot recover the humidity deterioration state at an early stage. Open the forced open / close valve to release the humidity-degraded air in the load within a short period of time, and forcibly discharge the water in the connection pipe, and then supply dry air from the supply device to the load. Enclose and restore the dryness within the load within a short time.
[0030]
In addition, when the pressure of the dry air in the load drops to the lower limit pressure value due to leakage or the like without causing deterioration of humidity, the dry air is automatically supplied from the supply device to the load by the action of the pressure switch of the supply device. At this time, even if there is moisture permeability in the air supply pipe connecting the supply device and the humidity control device, the moisture permeable moisture in the air supply pipe is absorbed by the desiccant of the humidity monitor. Therefore, the detection signal of the humidity sensor does not exceed the threshold value due to moisture permeation moisture in the air supply pipe, so that the operation signal output from the control circuit unit is output only according to the humidity on the load side. It will be a thing.
[0031]
【Example】
An embodiment of the present invention will be described below with reference to FIGS.
FIG. 1 shows a schematic configuration of one unmanned monitoring facility for controlling dry air in a load 56 in a wireless communication system. In the unmanned wireless room 43, a conventional supply device 44 and a conventional branch are provided. A configuration in which a humidity control device 14 is provided instead of the box B, and a load 56, which is a plurality of power supply line systems 56a installed outdoors, is connected to the humidity control device 14 by a connection pipe 55 for each power supply line system 56a. It has become.
[0032]
A humidity control device 14 (refer to FIG. 2 hereinafter) provided in place of the conventional branch box B includes a humidity monitor 1 having an inlet port 3 as an input port 36 of the humidity control device 14, and the humidity monitor 1 In addition to the manual opening / closing valve 15 and the manual opening / closing valve 15, the connection port 7, the manual opening / closing valve 15 for individually connecting each output port 37 connected to each power supply line system 56 a serving as the load 56 by the connection pipe 55. 7, the forced opening / closing valve 19 that opens the load 56 side directly to the outside air from the forced discharge port 39 without passing through the humidity monitor 1, the delivery port 4 and the discharge port 38 of the humidity monitor 1. And a control circuit unit 20 that outputs an operation signal in accordance with a detection signal of the humidity sensor 11 of the humidity monitor 1.
[0033]
The humidity monitor 1 (refer to FIG. 3 hereinafter) includes a bottomed cylindrical metal body cylinder 2 having an inlet port 3 on the bottom wall and a delivery port 4 and a mounting port 5 on the cylinder wall. A metal cap cylinder 6 having a top cylindrical shape that is tightly screwed and assembled to the open top end of the main body cylinder 2 and provided with a connection port 7 on the top wall, and is housed in a ventilated box to prevent scattering. In this state, the desiccant 8 stored in the main body cylinder 2 and the humidity sensor 11 attached to the attachment port 5 are configured.
[0034]
A filter 9 that prevents the desiccant 8 from entering the port is provided in the internal opening of each port. The filter 9 is provided between the main body cylinder 2 and the cap cylinder 6, and between the mounting port 5 and the humidity sensor 11. In the meantime, a packing 10 for achieving a seal is provided, and when the humidity sensor 11 is attached to the attachment port 5, the humidity sensor 11 is assembled to the tip, and the detection signal of the humidity sensor 11 is taken out. This is achieved by assembling the adapter 12 into which the terminal wire 13 is led out to the mounting port 5.
[0035]
The control circuit unit 20 (refer to FIG. 4 hereinafter) is operated by a circuit means for outputting an operation signal when a detection signal from the humidity sensor 11 exceeds a preset threshold value, and an operation signal input from the circuit means. The first timer 30 includes a first timer 30 and a second timer 31. The first timer 30 has a self-holding time that is set to be constant and is connected to the power source of the solenoid valve 17. The first timer contact I30a, which is a normally open contact to be controlled, and the first timer contact II30b, which is a normally closed contact, are configured. The second timer 31 has a certain operation start delay time, and the first timer The second timer contact 31a is a normally open contact that is connected in series with the contact II 30b to form an alarm circuit for transferring an alarm signal to the monitoring station.
[0036]
Further, a power supply terminal 32 connected to a power supply connector 41 of the humidity control device 14 to which a commercial AC power supply is connected is connected to a power supply transformer 21 for supplying power to circuit means and the humidity sensor 11, and a first timer 30. A solenoid valve terminal 33 to which the solenoid valve 17 is connected via the first timer contact I30a is connected in parallel. On the secondary side of the power transformer 21, a constant voltage that provides a constant DC power source for circuit means. A circuit 22 and a sensor power circuit 23 that generates power for the humidity sensor 11 are connected in parallel, and an output of the sensor power circuit 23 is applied to the humidity sensor 11 via a sensor terminal 34. .
[0037]
The circuit means performs zero adjustment and span adjustment on the voltage signal that is the detection signal of the humidity sensor 11 to adjust the output characteristics of the humidity sensor 11, and the threshold value of the detection signal from the amplification circuit 24. The comparator 25 outputs a signal when the detected signal is equal to or greater than the threshold value, a reference voltage circuit 26 that outputs a preset threshold value to the comparator 25, and the output of the comparator 25. A power amplifying circuit 27 for amplifying, and a relay 28 that operates by the output of the power amplifying circuit 27 and closes the relay contact 28a, thereby inputting a constant voltage power of the constant voltage circuit 22 to the timer circuit 29 as an operation signal. It is composed of
[0038]
A pressure gauge 16 is provided on the downstream side of each manual opening / closing valve 15 of the humidity control device 14. By operating the manual opening / closing valve 15, the presence or absence of leakage of dry air due to pressure change for each power supply line system 56 a. Can be inspected.
[0039]
Further, an expansion port 40 is provided in the pipe line to which the manual opening / closing valve 15 is connected, so that a power supply line system 56 a can be connected and expanded as a new load 56.
[0040]
A timer circuit 29 provided in the control circuit unit 20 of the humidity control device 14 is provided for setting and controlling the operation of the electromagnetic valve 17 in a unit of a fixed time unit and outputting an alarm signal when necessary. By giving a constant self-holding time to the first timer 30 that directly controls the operation and providing the first timer contact I30a of the first timer 30 in the power supply circuit of the solenoid valve 17, the operation of the solenoid valve 17 in units of a certain time is performed. When the control is achieved, and the first timer contact II 30b of the first timer 30 and the second timer contact 31a of the second timer 31 to which the operation delay time is given are connected in series, the solenoid valve 17 is opened for a certain period of time. Even after the operation, the alarm signal is output when the detection signal of the humidity sensor 11 is not below the threshold value.
[0041]
Note that the constant delay time is given to the second timer 31 because the first timer contact II30b and the second timer 31 which are normally closed contacts of the first timer 30 are instantaneous even when the timer circuit 29 is activated. This is because the second timer contact 31a, which is a normally open contact, is short-circuited to prevent an alarm signal from being illegally output.
[0042]
However, even if the electromagnetic valve 17 is closed due to the time-up of the first timer 30, if the value of the detection signal of the humidity sensor 11 is equal to or greater than the threshold value, the operation signal is still input to the timer circuit 29. Therefore, the second timer contact 31a remains in the “closed” state, and the first timer contact II 30b instantaneously returns to the “closed” state due to the momentary turn-off of the first timer 30 due to time up. At this time, both terminals of the alarm output terminal 35 are short-circuited and output an alarm signal to the monitoring station.
[0043]
【The invention's effect】
Since the present invention has the above-described configuration, the following effects can be obtained.
Since the humidity in the dry air supply line including the load is monitored between the supply device that is the dry air supply source and the load, the humidity in the load can always be maintained above a certain degree of dryness. Thus, it is possible to reliably prevent the deterioration of the transmission characteristics of the wireless communication system due to humidity, and to obtain a stable transmission operation.
[0044]
Normal humidity deterioration over time that occurs in the load can be automatically recovered by releasing the air whose humidity has deteriorated and supplying dry air, so that manual recovery is not required. Thus, an accurate and stable operation for preventing humidity deterioration can be obtained.
[0045]
Humidity deterioration in the load can be automatically and reliably recovered, so there is no need to periodically visit the site and replace the dry air in the load, and this is a major field survey for on-site response. Therefore, it is possible to greatly reduce the cost required for managing the wireless communication system and to exhibit an excellent management effect.
[0046]
The alarm signal is output when an abnormal condition occurs in which a large amount of water is accumulated in the dry air supply line on the load side. Therefore, this abnormal condition can be detected promptly and The state can be promptly recovered and recovered, whereby the excellent transmission characteristics of the wireless communication system can be stably maintained.
[Brief description of the drawings]
FIG. 1 is an overall system schematic diagram showing an embodiment of the present invention.
FIG. 2 is a pipe line and a layout diagram showing one configuration example of a humidity control device in the embodiment shown in FIG. 1;
3 is a semi-vertical cross-sectional front view showing an embodiment of a humidity monitor assembled to the embodiment shown in FIG. 2; FIG.
4 is a diagram showing a circuit configuration example of a control circuit unit assembled in the embodiment shown in FIG. 2;
[Explanation of symbols]
1; Humidity monitor 2; Body cylinder
3; Inlet port 4; Outlet port
5; Mounting port 6; Cap cylinder
7; Connection port 8; Desiccant
9; Filter 10; Packing
11; Humidity sensor 12; Adapter
13; Terminal wire 14; Humidity control device
15; Manual open / close valve 16; Pressure gauge
17; Solenoid valve 18; Regulating valve
19; Forced open / close valve 20; Control circuit section
21; Transformer for power supply 22; Constant voltage circuit
23; Sensor power supply circuit 24; Amplifier circuit
25; Comparator 26; Reference voltage circuit
27; power amplifier circuit
28; Relay 28a; Relay contact
29; Timer circuit
30; first timer 30a; first timer contact I
30b; First timer contact II
31; second timer 31a; second timer contact
32; Power supply terminal 33; Solenoid valve terminal
34; Sensor terminal 35; Alarm output terminal
36; Input port 37; Output port
38; discharge port 39; forced discharge port
40; Expansion port 41; Power connector
42; alarm connector 43; radio room
44; Feeding device 45; Compressor
46; sorption tank 47; shut-off solenoid valve
48; Check valve 49; Pressure releaser
50; Pressure gauge 51; Alarm
52; Air supply port 53; Alarm output terminal
54; Air supply pipe 55; Connection pipe
56; load 56a; feeder line system
K; Detector B; Branch box

Claims (6)

In a wireless communication system, dry air is sealed in a load (56), which is a feeder line system (56a) to an antenna such as a waveguide, in a certain pressure range, and the load (56) In the humidity control to keep the humidity below a certain value, drying including the load (56) in the middle of the dry air supply line between the supply device (44) as the dry air supply source and the load (56) When the humidity sensor (11) for detecting the humidity in the air supply line and a slight desiccant (8) are positioned together, and the detection signal of the humidity sensor (11) exceeds a preset threshold value, It is judged that the air in the dry air supply line including the load (56) has deteriorated in humidity, and the dehumidifying capacity of the desiccant (8) is determined by the moisture permeable moisture in the dry air supply line on the supply device (44) side. Can be dehumidified so that the detection signal of the humidity sensor (11) does not reach the threshold value, but the load (56) side A method for monitoring humidity of an antenna, wherein moisture permeation moisture in a dry air supply line is set so that dehumidification cannot be performed so that a detection signal of the humidity sensor (11) does not reach the threshold value. An inlet port (3) to which an air supply pipe (54) forming a dry air supply line from a supply device (44) as a dry air supply source is connected, and a feeder line system (56a) to an antenna such as a waveguide A connection port (7) to which a connection pipe (55) forming a dry air supply line to a load (56) is connected, a delivery port (4) for discharging dry air, and the load (56) When the humidity in the dry air supply line including the load (56) deteriorates in humidity, the humidity sensor (11 ) In the sealed hollow body provided with the mounting port (5), the moisture permeable moisture in the air supply pipe (54) does not reach the preset threshold value of the detection signal of the humidity sensor (11) However, moisture permeability in the connecting pipe (55) including the load (56) is detected by the humidity sensor (11). There a set to dehumidification capacity that can not dehumidification desiccant (8) to the extent that does not reach the threshold, the humidity monitoring device of the accommodating while preventing scattering to each port antenna. The sealed hollow body is composed of a bottomed cylindrical body cylinder (2) and a top cylinder-shaped cap cylinder (6) that is tightly assembled to the upper end opening of the main body cylinder (2). 3) is provided on the bottom wall of the main body cylinder (2), the delivery port (4) and the mounting port (5) are provided on the cylinder wall of the main body cylinder (2), and the connection port (7) is provided on the cap cylinder ( The antenna humidity monitor according to claim 2, which is provided on the top wall of 6). When the humidity in the dry air supply line including the load (56) is detected, and the air in the dry air supply line including the load (56) deteriorates in humidity, the detection signal exceeds the preset threshold value. Moisture permeable moisture in the air supply pipe (54) that forms the dry air supply line from the humidity sensor (11) and the supply device (44) that is the dry air supply source is detected in advance by the detection signal of the humidity sensor (11). Although it can be dehumidified so that it does not reach the set threshold, it is on the side of the connecting pipe (55) that forms the dry air supply line to the load (56) that is the feed line system (56a) to the antenna such as the waveguide Moisture permeable moisture of the humidity monitor (1) containing a desiccant (8) set to a dehumidifying capacity that cannot be dehumidified so that the detection signal of the humidity sensor (11) does not reach the threshold value. The inlet port (3) is an inlet port (36) to which the air supply pipe (54) is connected, and each of the plurality of feeder lines (56a) The output ports (37) to which the individual connection pipes (55) are individually connected are individually connected to the connection port (7) of the humidity monitor (1) via the manual open / close valve (15), so that Connect the open forced discharge port (39) to the connection port (7) of the humidity monitor (1) via the forced open / close valve (19), and connect the discharge port (38) that is also open to the outside air. A humidity sensor (11) of the humidity monitor (1) connected to the delivery port (4) of the humidity monitor (1) through a serial line of the solenoid valve (17) and the regulating valve (18) If the magnitude of the detection signal is equal to or greater than the threshold value, an operation signal for operating the solenoid valve (17) for a set time is output, and the solenoid valve (17) If the detection signal of the humidity sensor (11) is equal to or higher than the threshold even after the operation for a certain period of time, the humidity of the antenna provided with the control circuit unit (20) for outputting an alarm signal The control device. 5. The antenna humidity control apparatus according to claim 4, wherein an expansion port (40) for connecting a new feeder line system (56a) as a load (56) is provided in parallel with the outlet port (37). The control circuit unit (20) is operated by circuit means for outputting an operation signal when the detection signal from the humidity sensor (11) of the humidity monitor (1) exceeds a preset threshold, and by inputting the operation signal. Comprising a timer circuit (29) comprising a first timer (30) and a second timer (31), the first timer (30) having a certain self-holding time, and a solenoid valve (17) The first timer contact I (30a) that is a normally open contact that controls connection with the power source of the first timer contact II (30b) that is a normally closed contact, and the second timer (31) The second timer contact (31a) is a normally open contact that has a constant operation start delay time and is connected in series with the first timer contact II (30b) to form an alarm output circuit. 4. The humidity control apparatus for the antenna according to 4.

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