RHT21FT - Humidity/Temperature Transmitter

Product Diagram

The RHT21 is ideal for high-precision measurement of relative humidity and temperature.

The RHT21 transmitter is available in wall and duct mount versions.

The RHT21FT is loop powered and has two 4 - 20mA outputs, 0…100% humidity and -40…60°C.

An optional radiation shield providing a forced ventilation is recommended for use in outdoor applications.







4-20mA 2-Wire



Most drawings are supplied in PDF format. Portable Document Format is used to present documents in a manner independent of application software, hardware, and operating systems.


Lead Time for a Preferred Accessory Product


Accessory items are not manufactured by APCS. Accessory items only have 1 year warranty and may not be returned for credit. Accessory have a different discount structure to APCS manufactured items by APCS. Delivery is typically 12 days.

Alternate Products


Order Processing


APCS makes and customises products according to a customers order. Upon receipt of the customers order the following information is required before manufacture, allocation or deliver until full details are given, these include;

  1. Identity of purchaser. Company name, ABN (Australian companies), street address and accounts email address.
  2. Required delivery address.
  3. Full part number and calibration detail required to manufacture items.
  4. Total on purchase order to include delivery charges. Orders received with missing information will be entered and marked to indicate missing details and returned to the customer for correction or approval.

Compliance with the above ensures that your items are manufactured and delivered according to the required specifications.

Standard delivery times commence after the order has been approved for processing.