JPS6258135A - Water level detector of automatic water sampling apparatus - Google Patents

Abstract

PURPOSE:To certainly sample a predetermined amount of specimen water or to output an alarm signal, by providing a sensor for detecting the predetermined amount of sampled water to a water sampling tube. CONSTITUTION:Water sampling tubes T1-T12 are inserted in specimen containers S1-S12 and the sampling of water is controlled by opening and closing solenoid valves SV1-SV12. Sensors LS1-LS12 each detecting the lower limit of the water level in each specimen container and sensors HS1-HS12 each detecting the upper limit of the water level are respectively provided to the leading end parts of the tubes T1-T12 and the lead wires of the sensors are introduced into a control part 6. When water sampling time arrives, it is judged whether the water level of an adjusting tank 3 is E2 or more and, at the time of NO, a water level lower limit is outputted to stop the sampling of water and, if the water level is E2 or more, for example, the solenoid valve SV1 relating to the first specimen container S1 is opened and, when the upper limit water level sensor HS1 detects a water level A, a water sampling completion signal is outputted to close the solenoid valve SV1. When the detection signal of the water level A is outputted even if about 1-2min is elapsed after the valve is closed, it is judged that any trouble is generated and, therefore, the solenoid valve SV1 is closed and a water sampling impossible alarm is outputted.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to an apparatus for automatically sampling a predetermined amount of water at predetermined time intervals for water quality testing.

<Conventional technology> FIG. 4 shows a conventional example.

The sample water is pumped from the water channel to the adjustment tank 3 by the water sampling pump 2, where sediment, algae, etc. are removed, and then the sample water is pumped into the water sampling tube T to which the solenoid valves S■1...5VL2 are connected.
The sample is collected into sample container S1-312 via l-TI2. The overflow of the adjustment tank 3 and the overflow from the sample container are returned to the waterway through the drainage channel 4. Adjustment tank 3
is provided with a water level detector 5, the detection signal of which is input to the control unit 6, and each solenoid valve S
Vl-S Vl2 is controlled to open and close. The water level detector 5 has a function of detecting water levels below El and above 82.

The control unit 6 outputs a water level lower limit alarm when the water level is below E1, and when the water level is above 82, the solenoid valve S V 1-8 V I2 is output.
The solenoid valve was sequentially opened for 1 to 2 minutes every 1 to 3 hours to sample water into a sample container, and after opening the solenoid valve for a predetermined period of time, a water sampling completion signal was output. FIG. 5 shows a time chart of the operation.

When the water sampling command for the first sample container S1 is output at 1:00 OO, the water sampling completion signal is output after a time Tl. Next, at 3:00 OO, a water sampling command is output to the second sample container S2. The water sampling command is not output while the water level lower limit signal is being output.

<Problems to be Solved by the Invention> According to such a conventional device, the water sampling tube is clogged, and the tip of the water sampling tube does not enter the sample container.

There was a drawback that a water sampling completion signal was output even when water sampling was not successful due to a malfunction of the solenoid valve or the like. Furthermore, since the electromagnetic valve is opened for a predetermined period of time, there is a drawback that if there is a fluctuation in the flow rate in the water sampling tube, the water sampling 9 will also fluctuate.

An object of the present invention is to provide a water level detection device for an automatic water sampling device that reliably samples a predetermined amount of sample water or outputs an alarm signal.

<Means for Solving the Problems> The water level detection device of the present invention is characterized in that the water sampling tube is provided with a sensor for detecting a predetermined amount of sampled water.

<Example> FIG. 1 shows an embodiment of the present invention.

A water sampling pump 2 is provided in the water channel 1 to pump up sample water to the adjustment tank 3, and a water level detector 5 is provided in the adjustment tank 3 to determine the water level E1. Detect E2 and attach water sampling tube T to each sample container Sl-/SI2.
I-・TI2 is inserted, solenoid valve 5V1---8 V
The fact that water sampling is controlled by opening and closing 12 is the same as in the conventional example.

At each tip of the water sampling tube Tl-1TI2, a sensor LS+medium LS+2 for detecting the lower limit of the water level in the sample container and a sensor HS+...-HS I2 for detecting the upper limit of the water level are provided. The lead wire is connected to the control unit 6.
has been introduced. Lower limit detection sensor LS+/-LS+
2 is provided at the bottom to confirm that the sample container is empty. Upper limit detection sensor HS + ---
-HS +2 is provided at the top of the bottle to confirm that a predetermined amount of water has been sampled.

FIG. 2 shows a time chart of the operation of this embodiment, and FIG. 3 shows a flow chart of the sequence of the control section 5.

When the water sampling time comes, it is determined whether the water level in the adjustment tank 3 is equal to or higher than E2, and when the answer is No, a water level lower limit alarm is output and water sampling is stopped. If the water level is above E2, for example, the solenoid valve SV associated with the first sample container S1 opens, and when the upper limit water level sensor outputs water level A, a water sampling completion signal is output and the solenoid valve SVI closes. . After “closing” the solenoid valve, 1
If the water level A detection signal is not output even after ~2 minutes have elapsed, this means that some kind of failure has occurred, so the solenoid valve closes and a water sampling impossible alarm is output.

<Effects> According to the present invention, a predetermined amount of water can always be sampled even if there are fluctuations in flow resistance, water pressure, etc. of the sampling channel. Further, when some kind of failure occurs in the device, a warning can be reliably output.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of the present invention, FIG. 2 is a time chart showing its operation, and FIG. 3 is a sequence flow chart. FIG. 4 is a configuration diagram showing a conventional example, and FIG. 5 is a time chart showing its operation. 5Vn--Solenoid valve Sn-Sample container H3n-Upper limit sensor LSn-Lower limit sensor Tn--Water sampling tube

Claims (1)

[Claims] In a device that inserts a water sampling tube into a sample container and collects a predetermined amount of sample water into the sample container by opening and closing a solenoid valve connected to the water sampling tube, a predetermined amount of sample water is inserted into the water sampling tube. A water level detection device for an automatic water sampling device, characterized in that it is provided with a sensor for detecting.