RL4401/2 Temperature Transmitter -200°C to +110°C

RL4401/2 Temperature Transmitter -200°C to +110°C

Part of the RL4000T Series, the RL4401 (single channel) and RL4402 (dual channel) 4-wire PT100 unit with fitted 5-pin metal Lemo socket for the external temperature sensor and LCD display.

Instrument measuring range: -200°C to +110°C

Probes are available separately – see below for compatible probes

RL4401/02 Datasheet

Low and High Temperature Sensors

Part of the RL4000T Series, the RL4401 (single channel) and RL4402 (dual channel) 4-wire PT100 unit with fitted 5-pin metal Lemo socket for external low and high temperature sensors and LCD display. All of our products can be easily calibrated in-house to traceable or UKAS as and when required by our customers, contact us for more information about calibration.

These products are not available to purchase online due to the radio system requirement, please contact us for information and to discuss the product variable options most suitable to your application:

  1. RL4401-434.075 – The RL4401 is a single channel radio transmitter.
  2. RL4402-434.075 – The RL4402 is a dual channel radio transmitter.


✓ Single/Dual Channel instrument
✓ Highly accurate low and high temperature sensors
✓ LCD display with data readings & battery life
✓ Superior performance hardware & high accuracy sensors
✓ Easily accessible battery & USB socket
✓ Low power radio for long distance transmission (3km over open ground)
✓ Complies with RoHS, EU & WEEE directives
✓ Carries CE Marking

Typical Applications for low and high temperature sensors

• Fridges
• Freezers
• Chillers


Wireless data logger specification

For the Instrument specification, please click on the Hanwell Pro RL4401/2 transmitter datasheet.

Low and high temperature sensor specification

For a range of low or high temperature sensor options, browse our probe datasheet


This product is to be used in conjunction with the Hanwell EMS software for a comprehensive centralised monitoring and control solution.

Compatible products

Software Required:

W900 – Standard Hanwell EMS Software Package
W906 – Validated Hanwell EMS Software Package
*See EMS datasheet for further options

Hardware Required:

Probe datasheet – High temperature sensor
SR2 – Smart Receiver
CR2 – Controller
REP – Repeater

Y119 – Wall mounting bracket
88706 – AA Lithium battery

Find out more about about our range of low and high temperature sensors and how they can be used to suit your application or alongside a larger system using our centralised monitoring system, EMS. Contact us today or call us on +44 (0) 1462 688 070.

Manufactured by Hanwell | Ellab