Temperature and Humidity Controller for HVAC – DTH-948
DTH-948 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 48 x 120 mm
Technical Specifications :
| Parameters | Description |
|---|---|
| Input from T+RH Transmitter | 4-20 mA from T + Rh transmitter |
| (both the inputs can be derived from Libratherm make) | |
| 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) | |
| Range | 0.0 °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) | |
| Resolution | 0.1 °C for Temp. and 0.1 % for RH |
| Indicating Accuracy | +/- 0.3oC for Temp. and + / - 0.5% for RH. |
| (Subject to accuracy of the sensor/transmitter used in the system) | |
| Display | 4-digit 0.3" Red 7-segment display for Temp. in °C. |
| 4-digit 0.3" green 7-segment display for RH in %. | |
| Front Panel LED indications for Control outputs and alarms. | |
| Control Action | PID - 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 Output | a) 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 settings | Set points PID and On-Off hysteresis values for T and Rh are individually programmable through key board. |
| Alarm settings | High and Low settable for each T and RH with programmable Hysteresis. |
| Alarm Outputs | 2 sets of relay contacts - (C1-NO1), (C2-NO2) |
| Tuning | Manual tuning of PID values. |
| Memory Backup | Retention 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). |
| Supply | 90-240VAC, 50/60Hz. |
| Size | 96W x 48H x 120D mm. |
| Panel Cutout | 92W x 44H mm. +/- 0.5 mm. |
| Enclosure | ABS plastic with polycarbonate front graphic. |