RL4401/2: Temperature Sensors with a Range of -200 °C to +110 °C

The RL4401 (single channel) and RL4402 (dual channel) 4-wire PT100 units are part of the RL4000T Series. They are fitted with 5-pin metal Lemo socket for external high- and low-temperature sensor and LCD display.

Due to the radio system requirement, these products are not available to purchase online. Customers can contact IMC for more information and discuss the product variable options most suitable to their applications:

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

Instrument Specifications

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Dimensions 110 x 80 x 35 mm
Weight 200 g
Power Supply 3.6 V AA Lithium battery
Memory capacity 100,000 readings
IP Rating IP50


Technical Specification

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Probe Options 4 Wire PT100 – Probes below are sold separately
Option 1 J094-3-01 4 wire PT100 (3 m cable with 5-pin Lemo Plug)
Option 2 J094-5-01 4 wire PT100 (5 m cable with 5-pin Lemo Plug)
Range -200 °C to +110 °C
Accuracy ±0.1 °C
Resolution 0.1 °C


Radio Transmitter Functions

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Frequency Options A range of frequencies is available between 433-458 MHz. Country specific regulations apply.
Radio Power 10 mW
Radio Range 3 km over open ground
Battery Life Up to 18 months


This product can be calibrated to customers' specifications.

N.B Instrument operating range -20 °C to +65 °C in a non-condensing RH environment.

System Components

Software Required

W700 – Standard Synergy Software Package
W706 – Validated Synergy Software Package

*See Synergy datasheet for further options

Hardware Required

SR2 – Smart Receiver
REP – Repeater
CR2 – Controller


Y119 – Wall mounting bracket
88706 – AA Lithium battery

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