Temperature and Humidity Controller for Greenhouse – DTH-966-A
Temperature and Humidity Controller for Greenhouse – DTH-966-A
Product Description :
DTH-966-A – On-Off Controller or High/Low Alarms for Temperature & %Rh. Two input and Four Relay Outputs / 4 SSR Outputs / Dual 4-20mA Retransmission output and RS-485 MODBUS interface.
Size (H x W x D) – 96 x 96 x 120 mm
Size (H x W x D) – 96 x 96 x 120 mm
Libratherm offers a new model of Temperature and Humidity Indicator & Controller Model DTH-966-A, designed using the latest high-speed microcontroller. This controller is most suitable for Humidifier, De-Humidifier, Hatchery Incubators/Ovens, HVAC systems, and other similar applications.
T+RH PID/On-Off Controller or High/Low Alarms DTH-966-A accepts inputs from a standard T + RH Sensor or Transmitter. The instrument displays the temperature and humidity on 4 digits 0.5” 7-segment Red / Green LEDs. High and Low alarm outputs in the form of DC pulse and relay contacts are available for each parameter and are settable using front panel keyboards. To interface with other devices analog retransmission output proportional to measured temperature and humidity values in the form of 4-20mA/0-10V is also provided. Digital communication with PC or another device through RS-485 serial port over MODBUS is available.
Key Features :
- Microcontroller based design.
- Elegant appearance, easy to operate and compact in size.
- Highly accurate and sturdy in operation.
- Dual display for simultaneous indication of T and RH.
- Field proven Algorithm, tested successfully for various HVAC control applications.
| Parameters | Description |
|---|---|
| No. of Inputs | 2 (one each for Temperature and Relative Humidity). |
| Input | From Standard T + RH sensor / transmitter |
| Range | -40.0 to 60.0°C / 0.0 to 60.0°C / 0.0 to 80.0°C / 0.0 to 150.0°C and 0.0 to 100.0 %RH. (Subject to type of Sensor used) |
| Resolution | 0.1°C / 0.1% Rh. |
| Indicating Accuracy | Better than ± 0.1°C for temperature and ± 0.1% for RH. (Actual accuracy will depend on specified accuracy of selected Sensor / Transmitter). |
| Display | 4 digit 0.5” Red 7-segment display for temperature 4 digit 0.5” Green 7-segment display for %RH (model dependent) |
| Control Action | ON-OFF with programmable Hysteresis values. |
| Control Outputs | 4 x DC pulse (0-10VDC) to operate external Solid State Relays (SSR) |
| Alarm Outputs | High / Low alarm each for temperature and RH (total 4 outputs). |
| Retransmission Output | 4-20mA proportional to the specified temperature range 4-20mA proportional to 0 to 100% Rh. (Optional feature) |
| Open Sensor Indication | Display shows Open and control outputs will be turned OFF. |
| Settings | Using front panel membrane keyboard to set the various values. |
| Memory Backup | Retention of Set values in the non-volatile memory in the event of power failure. |
| Serial Interface | Two wire RS485 over Modbus RTU Protocol for PC interface. (Optional feature) |
| Supply | (90-250)VAC, 50/60Hz. |
| Size | 96 x 96 x 120 mm |
| Panel cut out | 92 x 92 +/-0.5 mm |
| Enclosure | ABS plastic with polycarbonate front. |
| Sr. No. | Specifications | Part no. |
|---|---|---|
| 1.1 | Analog Input: 2 x 4-20mA, Output: 4 x SSR | 3301-1 |
| 1.2 | Analog Input: 2 x 4-20mA, Output: 4 x Relays | 3301-2 |
| 1.3 | Analog Input: 2 x 4-20mA, Output: 4 x SSR + 2 x 4-20mA Retransmission | 3301-3 |
| 1.4 | Analog Input: 2 x 4-20mA, Output: 4 x Relays + 2 x 4-20mA Retransmission | 3301-4 |
| 1.5 | Analog Input: 2 x 4-20mA, Output: 4 x SSR + RS-485 serial port | 3301-5 |
| 1.6 | Analog Input: 2 x 4-20mA, Output: 4 x Relays + RS-485 serial port | 3301-6 |
| 2.1 | Analog Input: 2 x 0-1V from Hygroclip-XD or equivalent Output: 4 x SSR | 3302-1 |
| 2.2 | Analog Input: 2 x 0-1V from Hygroclip-XD or equivalent Output: 4 x Relays | 3302-2 |
| 2.3 | Analog Input: 2 x 0-1V from Hygroclip-XD or equivalent Output: 4 x SSR + 2 x 4-20mA Retransmission | 3302-3 |
| 2.4 | Analog Input: 2 x 0-1V from Hygroclip-XD or equivalent Output: 4 x Relay + 2 x 4-20mA Retransmission | 3302-4 |
| 2.5 | Analog Input: 2 x 0-1V from Hygroclip-XD or equivalent Output: 4 x SSR + RS-485 serial port | 3302-5 |
| 2.6 | Analog Input: 2 x 0-1V from Hygroclip-XD or equivalent Output: 4 x Relay + RS-485 serial port | 3302-6 |
| 3.1 | Analog Input: (0-3.3V+Pt-100) from HTS-220/HTS-440 or equivalent Output: 4 x SSR | 3303-1 |
| 3.2 | Analog Input: (0-3.3V+Pt-100) from HTS-220/HTS-440 or equivalent Output: 4 x Relays | 3303-2 |
| 3.3 | Analog Input: (0-3.3V+Pt-100) from HTS-220/HTS-440 or equivalent Output: 4 x SSR + 2 x 4-20mA Retransmission | 3303-3 |
| 3.4 | Analog Input: (0-3.3V+Pt-100) from HTS-220/HTS-440 or equivalent Output:4 x Relay + 2 x 4-20mA Retransmission | 3303-4 |
| 3.5 | Analog Input: (0-3.3V+Pt-100) from HTS-220/HTS-440 or equivalent Output: 4 x SSR + RS-485 serial port | 3303-5 |
| 3.6 | Analog Input: (0-3.3V+Pt-100) from HTS-220/HTS-440 or equivalent Output: 4 x Relay + RS-485 serial port | 3303-6 |
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