Humidity control instrument - switchgear temperature and humidity controller - temperature and humidity controller manufacturer

Temperature and humidity controller manufacturer

Overview:

The product adopts a digital temperature and humidity sensor, which displays temperature and humidity values in the form of a digital tube. It is equipped with fan and heater contacts, and has functions such as load disconnection alarm, sensor fault indication, RS485 communication, etc. Suitable for unmanned substations. Users can program the upper and lower limits of temperature and humidity, cycle display mode, communication parameters, etc. through buttons. This series of products has strong anti-interference ability and high reliability, and complies with GB/T 15309-1994 and GB/T 13978-92.

Main features of the second product:

Adopting integrated digital temperature and humidity sensors with high measurement accuracy;

Each measurement corresponds to 2 control output contacts, which can be connected to a heater and a fan respectively;

Through button programming, users can freely set control parameters and controller operating parameters;

Instrument setting data * saved, not lost after power failure;

Extremely strong ability to resist electromagnetic interference;

It has password protection function.

Three technical indicators

Switch setting, hysteresis to control output:

In the process of temperature and humidity control, the difference between the temperature or humidity value when the executing component (heater or fan) starts working and the temperature or humidity value when it stops working is called hysteresis.

MANUAL

Long press the left button of the device to enter manual heating mode in normal measurement display state, the exhaust function will be turned off, and the corresponding indicator light will indicate. About half an hour after starting, or lightly touch the left button again in manual mode to turn off the manual heating function, and the device will enter automatic measurement and control mode.

Long press the right button of the device to enter manual exhaust mode in normal measurement display state, the heating function will be turned off, and the corresponding indicator light will indicate. About half an hour after starting, or lightly touch the right button again in manual mode to turn off the manual exhaust function, and the device will enter automatic measurement and control mode.

Installation method (panel size 72 * 72mm, hole size 68 * 68mm, installation depth 85mm)

Wiring Terminal Diagram

Four device operation and usage instructions

4.1 Measurement

In the measurement state, the upper digital tube displays the temperature of the current test channel, the front section of the lower digital tube displays the channel number, and the back section displays the humidity value of the current test channel. In addition, the temperature and humidity values of the corresponding sensor channels can be cyclically measured and displayed during multi-channel measurement and control.

4.2 Control

Factory default settings:

Start the heater at 85% humidity and turn off the heater at 77% (with a hysteresis of 8%)

Start the heater at a temperature of 5 ℃ and turn off the heater at 13 ℃ (with a hysteresis of 8 ℃)

Start the fan at a temperature of 40 ℃ and turn off the fan at 35 ℃ (with a hysteresis of 5 ℃).

When the temperature or humidity value of the environment meets the pre-set working conditions, the heater or fan is started, and the corresponding indicator light is lit (middle luminous tube). When the heater or sensor fails to work according to the conditions, the corresponding alarm indicator light is lit to indicate an alarm.

4.3 Control Testing

In normal working condition, hold down the left directional key for more than 3 seconds, and all channels that are working normally will be heated unconditionally; Press and hold the right arrow key for more than 3 seconds, and all channels that are working properly will blow air unconditionally.

4.4 System Setting Mode

4.4.1 Enter/Exit System Settings Mode

Enter the system:

Under normal circumstances, the instrument is in normal working condition. At this time, press the SET key for 3 seconds to enter the system settings mode. Press the Enter key to enter the password, which defaults to 0002 at the factory. If the password is correct, it will automatically enter the main menu.

After entering the main menu, the digital display on the top row shows' CH1 '. Press the enter key to enter the channel 1 working parameter settings. Press the left and right keys to switch to other menus at the same level. This menu includes' CH2', 'COMM', 'DISP', 'ALM', and 'REST', which are used to set the working parameters of channel 2, set communication, display mode, alarm settings, and restore factory settings (see user programming flowchart). Click enter to enter the main menu, where you can use the left and right keys to select other main menu options for settings. Communication 'COMM' can set the local address (1-247) and communication baud rate (1200, 2400, 4800, 9600). Display mode 'DIP' sets the interval time for three channel cyclic measurement displays, including closed loop or intervals of 2s, 4s, 6s, and 8s.

Exit the system:

Repeatedly pressing the "SET" key in the main menu setting mode will gradually return to the previous menu directory until exiting the system setting mode and returning to normal working state. In the menu setting mode, do not operate the button and it will automatically return to normal working mode after about 3 minutes.

4.4.2 Setting of channel parameters

The parameter setting process for CH1 and CH2 is completely the same. The following provides a detailed explanation using CH2 as an example. After entering the system settings, the menu and data are displayed in area 1, and area 2 displays the channel number after entering the channel settings. Display before entering CH2:

Click enter to display as follows

Click enter to display as follows

Click enter to display as follows

Click enter to display as follows

Click enter to display as follows

Click enter to display as follows

4.5 User Programming Text Description

4.6 User Programming Flowchart

Five Data Communication

This instrument provides a serial asynchronous half duplex RS485 communication interface, using MODBUS-RTU protocol, and various data messages can be transmitted on the communication line.

Function code: Tell the addressed terminal what function to perform. The function codes supported by this series of instruments, as well as their meanings and functions.

Example of Communication Message: 1. Read Data (Function Code: 03/04): This function allows users to obtain data and system parameters collected and recorded by the device. There is no limit to the number of data requests a host can make at once, but it cannot exceed the defined address range.

Data frame query (host)

Response data frame (slave)

The above message sent back the following information:

1. One way temperature=(0131H)/10=305D/10=30.5 ℃

One way humidity=(0334H)/10=820D/10=82%

One temperature information is composed of 8 bits of high temperature and 8 bits of low temperature, which are integrated into a hexadecimal number 131H. 131H is converted into a decimal number 305D, and then divided by 10 to obtain the real-time temperature value of 0.5 ℃

One channel of humidity information consists of 8 bits of high humidity and 8 bits of low humidity, which are integrated into a hexadecimal number 334H. 334H is converted into a decimal number 820D, and then divided by 10 to obtain the real-time temperature value of 82%.

The calculation of temperature and humidity values for the second path is similar to that of the * path.

When the high and low bits of a certain data channel are both 00H, it indicates that the corresponding sensor is disconnected.

3. In the working state of the load, the lower 8 bits of data are converted into binary numbers, and the data format is:

Work status word description

When one of the lower 8 bits is 1, it indicates that the corresponding load is working.

For example, if the low position of the load status displays 08H, corresponding to binary digits, it indicates that heater 1 is in working condition.

The address table of communication parameters for the six intelligent temperature and humidity controllers is attached in the appendix;

Intelligent temperature and humidity control instrument communication parameter address table

*Attribute: Command word, R (read) -03 (04) W (write) -10

note appended:

Work status word description

Switchgear temperature and humidity controller

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