N321S-RS485 Differential Temperature Controller with RS-485, 240 V Powered

In stock (4 items available)
  • Weight
    0.3 kg
  • SKU
    CET-031

Novus' N321S controller is designed for solar water heating applications. Two NTC-type temperature sensor inputs and one control output. It can be controlled by a PC/PLC via RS-485 serial (Modbus RTU protocol) and requires 240 VAC

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The N321S is a controller for solar heating applications. It typically commands a water circulation pump through the temperature differential between the solar collector and the thermal reservoir or pools.

The controller has two inputs for NTC-type temperature sensors (supplied with the controller) and one control outlet for activating the water circulation pump.

It also includes functions for preventing damage to during deep winter and high summer, thereby preventing plumbing damages (burst pipes) and thermal discomfort.

RS-485 serial and the Modbus RTU protocol allow the N321S to be queried or controlled from a PC, PLC or SCADA system.

CE (European Union) and UL (United States and Canada) certifications compliant.

Please note: To increase the sensors' life span, it is recommended that the sensors are either installed inside a thermowell that is carefully designed to avoid water logging due to condensation OR have the sensors attached to the exterior of the tank

  • Power Supply: 100 to 240VAC or VDC ±10%, 50 to 60Hz
  • Power Consumption: 5VA
  • Protocol: Modbus RTU via RS485
  • Operating Temperature: 0 to 40°C
  • 2 x Sensor Inputs:
    • Type: NTC sensors (supplied)
    • Range:  -50 °C to 120 °C
    • Accuracy: 0.6°C (NTC)
    • Resolution: 0.1ºC (from –19.9 to 119.9ºC); 1ºC (elsewhere)
  • 1 x Control Output: SPDT relay, 1HP 250VAC / 1/3HP 125VAC (16A resistive)
  • Case Protection:
    • Front panel: IP65
    • Box: IP42 with Polycarbonate material, UL94-2
  • Panel Cut-Out: 70 x 29 (mm)
  • Dimensions: 75 x 33 x 75 (mm)
  • Novus part number: N321S-NTC-485

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

Full Terms and Conditions

By placing an order with Ocean Controls, you agree to be bound by our Terms and Conditions of Trade.

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