CN103576726A

CN103576726A - HYW-300 temperature and humidity control transmitter

Info

Publication number: CN103576726A
Application number: CN201210268544.7A
Authority: CN
Inventors: 胡颖雯
Original assignee: Individual
Current assignee: Individual
Priority date: 2012-07-21
Filing date: 2012-07-21
Publication date: 2014-02-12

Abstract

The invention provides a HYW-300 temperature and humidity control transmitter and belongs to the application environment temperature and humidity control field of measuring and control instruments and 4-20mA current standard signal transmitters. At present, existing similar temperature and humidity controllers have no the capacity of converting temperature and humidity parameters into 4-20mA current for remote transmission simultaneously, and although some temperature and humidity controllers are provided with 485 communicating interfaces, actual using valve does not exist. Existing temperature and humidity transmitters convert the temperature and humidity parameters into the 4-20mA current but do not have a control function. The HYW-300 temperature and humidity control transmitter has functions of common temperature and humidity controllers and functions of the temperature and humidity transmitters, can convert the temperature and humidity parameters into the 4-20mA current and remotely transmit the 4-20mA current to a control console and is a good primary instrument for transformer substations and other large comprehensive monitoring and controlling systems.

Description

HYW-300 Temperature and Humidity Control transmitter

1. technical field

The measurement control of anti-condensation control, Dehumidification controlling and domain of control temperature and parameter become send remote transmission instrument.Mainly be used in various regulator cubicles in electric system ground etc. and need humiture and anti-condensation control field.

2. technical background

There are in the market 2 kinds of similar instrument.

A temperature and humidity controller, can complete the field control of dehumidifying condensation proof and temperature, have also with 485 communication interfaces.But because exist in actual applications and the obstacle (the non-same company of upper and lower computer manufactures) of host computer communication protocol, the humiture parameter teletransmission measuring cannot be arrived to control desk.

Another kind is exactly warm and humid transmitter, specially humiture parameter is converted to the teletransmission of 4～20mA normalized current to control desk.

Reality need to a kind ofly can complete field control, can produce again the multifunction instrument of 4～20mA remote transfer signal.

3. summary of the invention

HYW-300 wet temp is controlled transmitter following invention

In an instrument, both complete the field control of humiture, and can produce again temperature, the humidity remote transfer signal of 4～20mA, possessed transmitter functions.

4. specific embodiments and method

4.1 hardware circuit

Temperature and Humidity Control transmitter be take single-chip microcomputer as core, minute two parts.

A. controller is partly furnished with temperature, Humidity Detection input channel, controls output channel, the parts such as charactron demonstration and operation push-button.Input channel has temperature, humidity sensor, A/D conversion etc.; Control output channel and have I/O signal, photoelectric commutator, amplifier, relay, topworks's (well heater and blower fan).

B. transmitter partly has D/A conversion, and isolated form V/I conversion etc., export 2 tunnel 4～20mA electric currents.

4.2 show charactron

On panel, there is effective temperature, the moisture measurement value of showing of three figure place codes; The warning message that display system is abnormal; Various setting values and the prompt of display update.When temperature sensor is bad, charactron shows TER; When humidity sensor is bad, charactron shows HER.

4.3 button

On panel, there are four buttons: " ST ", " ↑ ", " ↓ " and " EN ", be respectively " setting ", " progressively increasing ", " successively decreasing " and acknowledgement key.With these four keys, can complete the setting value lower limit of Temperature and Humidity Control and the modification of the upper limit.

4.4 indication light diodes

On panel, have five red light emitting diodes, when charactron displays temperature measured value, " temperature " pilot lamp is bright; When charactron shows moisture measurement value, " humidity " pilot lamp is bright; When heating circuit is opened a way, " broken string " pilot lamp bright also " load 1 " pilot lamp is glittering; When open a way in blower fan loop, " broken string " pilot lamp bright also " load 2 " pilot lamp is glittering; When normal heating or blowing, " load 1 " or " load 2 " pilot lamp is bright.

On 4.5 panels, there is " automatically---a manually " change-over switch.When switch is beaten at " manually " state, with manually controlling heating; When switch is beaten at " automatically " state, controller enters automatic control state, does not need manual intervention.

The application program of 4.6 single-chip microcomputers C language compilation, completes following content.

A. to charactron, send displaying contents;

B. explain and carry out key command;

C. command light emitting diode work;

D. explain and carry out " automatically---manually " change-over switch;

E. check and process warning message;

F. complete the sampling of temperature and humidity;

H. complete Dehumidification controlling.

I. completing temperature controls

K. by the temperature measuring, humidity value, by D/A converting member, become 0～5V signal, then by isolated form V/I converting member, become the accurate remote transfer signal of 2 road sign of 4～20mA.Temperature is linear with 4～20mA electric current within the scope of-40～100 ℃; Humidity is linear with 4～20mA electric current within the scope of 0～100%RH.

5. accompanying drawing explanation

Fig. 1 is HYW-300 Temperature and Humidity Control transmitter theory diagram; Fig. 2 is HYW-300 temperature and humidity controller transmitter panel layout.

Fig. 3 is HYW-300 Temperature and Humidity Control transmitter applications line graph.

Claims

HYW-300 Temperature and Humidity Control transmitter has following invention technical characterictic:

HYW-300 Temperature and Humidity Control transmitter has each of temperature, humidity sensor, and two combine into one to make temperature and humidity controller and humiture transducer, simplified whole TT&C system.

1. on the basis of common temperature and humidity controller, increased transmitter functions, can complete on-the-spot Temperature and Humidity Control, possessed again teletransmission 2 tunnels and be worth corresponding 4～20mA electric current to the ability of control desk with temperature, moisture measurement.