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Temperature and Humidity Controller for HVAC – DTH-966-AHU

Bar Graph Indicator Model BGI-144

Process Control Instruments

Temperature and Humidity Controller for HVAC – DTH-966-AHU

DTH-966-AHU Micro controller based PID/On-Off Temperature & Humidity controller. Two input and two PID/On-OFF control outputs with alarms.

Size (H x W x D):96 x 96 x 120 mm

Technical Specifications :

ParametersDescription
ModelDTH-966-AHU
Input from T+RH Transmitter4-20 mA from T + Rh transmitter
(both the inputs can be derived from Libratherm make
(T + Rh) transmitter model HTX-220/HTX-440 or from any other 3rd party similar transmitter.
Input from T+RH Direct Sensor(0-1)V, (0-3.3)V and/or direct Pt-100 sensor.
(Like Hygroclip-XD or HTS-220/HTS-440)
Range0.0 °C to 60.0 °C for temp. (Optional upto 80.0 °C) & 0.0 to 100.0 % for RH. (Programmable Span Hi and Span Lo)
Resolution0.1 °C for Temp. and 0.1 % for RH
Indicating Accuracy+/- 0.3 °C for Temp. and + / - 0.5% for RH.
(Subject to accuracy of the sensor/transmitter used in the system)
Display4-digit 0.3" Red 7-segment display for Temp. in oC.
4-digit 0.3" green 7-segment display for RH in %.
Front Panel LED indications for Control outputs and alarms.
Control ActionPID - User selectable Direct and Reverse action.
(Direct/Reverse)(In DIRECT action the control output increases as the process value approaches towards the set value and In REVERSE action the control output decreases as the process value approaches towards the set value)
Control Outputa) Dual 4-20 mA or 0-10VDC/0-5VDC for T and RH control
b) Dual DC pulse (0 to 12)VDC - for T and RH (PID + On-Off)
Control settingsSet points PID and On-Off hysteresis values for T and Rh are individually programmable through key board.
Alarm settingsHigh and Low settable for each T and RH with programmable Hysteresis.
Alarm Outputs2 sets of relay contacts – (C1-NO1), (C2-NO2)
TuningManual tuning of PID values.
Memory BackupRetention of PID and Set values in the built in non-volatile memory in case of power failure and automatic re-execution of control on power resumption.
Serial Interface (Optional feature)Two wire RS485 on Modbus RTU Protocol for PC/DCS/PLC/BMS interface (in slave mode with user programmable ID).
Supply90-240VAC, 50/60Hz.
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