N323-RHT-485 Temperature & RH Controller w/ RS-485, 240 VAC

N323-RHT-485 Temperature & RH Controller w/ RS-485, 240 VAC

SKU: CET-113

Panel mount temperature & relative humidity controller with sensor probe on 3 metres of cable. 3 independent relay outputs. RS-485 Modbus communications. 100 to 240 VAC powered.

  • Manufacturer: Novus
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The N323RHT is a digital controller for relative humidity and temperature. Its 3 relay outputs can be configured independently as control or alarm, either for temperature or relative humidity. A relative humidity and temperature or RHT probe (3 m cable length) is provided along with the instrument

The temperature, humidity and status of relays are shown on the LED Display.

Each relay output has configurable set point, hysteresis and action. Relays can trigger above or below setpoints, within or outside temperature ranges. On and off times are configurable.

Relay outputs can drive fans, compressors, pumps, heaters, humidifiers etc. to control the temperature and humidity.

The controller has an RS-485 port and communicates via Modbus RTU, allowing integration into building management or logging systems.

Applications include fruit storage, data centres and air conditioning.


  • RHT sensor probe with 3 metre cable included
  • Triple independent relay output
  • Bright, 3.5 digit LED display
  • Adjustable hystereses and configurable setpoint minimum and maximum limits
  • Configurable password protection
  • IP65 when installed in a panel
  • RS-485 Modbus communications
  • Heating, cooling, humidifying or drying modes, in band and out of band alarm modes
  • Initial blocking modes prevent alarms from activating until normal operation has commenced
  • Configurable delayed start allows reduction of inrush current when using multiple controllers powered up at once
  • Temporary activation mode to activate an output for a maximum fixed time.
  • Sequential activation mode toggles an output on and off for mixers or agitators


    • SKU
    • Weight
      0.38 kg
    • Dimensions (L x W x H)
      32.5 x 12 x 4.5 cm


Physical and Environmental:
Sensor Probe:
Humidity measurement accuracy:±3% from 20% to 80%
Humidity stability:≤1 %RH / year
Humidity measurement range:0 to 100 % RH
Humidity linearity error:≤1 % RH
Long term humidity stability:≤1 % RH
Humidity response time:4 seconds (10 to 90 %)
Temperature measurement accuracy:±0.5 to ±2 °C depending on temperature
Temperature repeatability:±0.1 °C
Temperature measurement range:-20 to 100 °C
Cable length:3 metres
Warm-up:15 minutes
Temperature resolution:0.1º (–19.9º and 119.9º)
RH resolution:1%
OUTPUT1 Relay:SPDT, 16A / 250 VAC (1 HP)
OUTPUT2 Relay:SPST, 3A / 250 VAC
OUTPUT3 Relay:SPST, 5A / 250 VAC
Power:100 to 240 VAC (± 10 %)
Mains frequency:50 to 60 Hz
Power consumption:5 VA
Serial Port:RS-485
Communication:Modbus RTU protocol
Dimensions:75 × 33 × 75 mm
Panel cut-out:70 × 29 mm
Weight:120 g
Operating temperature:0 to 40 °C
Storage temperature:-20 to 60 °C
Operating relative humidity:20 to 85 % non condensing
Case:Polycarbonate UL94 V-2
Ingress protection (front):IP65
Ingress protection (rear):IP42
Suitable wiring:Up to 4.0 mm²

Faulty Goods and Warranty

Where such goods have been supplied we undertake to repair or replace them as quickly as possible.Prior to returning faulty items, please contact us with a description of the fault as one of our engineers might be able to assist you by resolving the issue over the phone.
A Warranty form must be filled out and returned with any goods.

Our standard warranty period is 12 months from the date of purchase unless stated otherwise.

Other warranty periods:

Labjack Products: 5 Years
Atop Products: 3 Years
MeanWell Products: 3 Years
Terracom Products: 3 Years

Warranty is subject to us being satisfied that a defect was caused by defective workmanship or materials and was not caused by or was not substantially contributed to by other factors beyond our control including incorrect installation, alterations or modifications of the product not recommended by the manufacturer.

Returns Policy

If you are dissatisfied with our goods you may return them within 14 days of the dispatch date. Contact us for an authorisation and we will refund your purchase less shipping costs and restocking fees. All returned goods MUST be in AS NEW condition including ALL PACKAGING and DOCUMENTATION / MANUALS etc.

Please note:

  • The product returned will attract a 20% restocking fee.
  • The customer must pay the delivery costs.
  • Non standard, custom made or a specially manufactured or imported products are not returnable.
  • Semiconductors, books and software are not refundable

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