RL4803/4 Radio Transmitter

Digital Radio Transmitters; Door, Machine, Pump and Level Monitoring

Part of the RL4800 Series, the RL4803 (Single Channel) and RL4804 (Dual Channel) are British Made Digital Radio Transmitters for door, machine, pump or level monitoring internally or externally. Each unit includes a steel bracket for mounting purposes.

Below are multiple applications that the Transmitters can be used for:

  • Production Machine Downtime Monitoring
    Receive alerts when critical equipment is off-line for within any predetermined period.
  • Pump Monitoring
    Receive notifications when the pump stops longer than a predetermined period.
  • Level Monitoring
    Monitor the state of level in tanks, reservoirs, rivers and much more.
  • Door Monitoring
    Monitor and alarm critical doors on fridges within cold storage distribution centers.
  • Refrigeration Plant Monitoring
    Predictive maintenance for refrigeration systems. Receive early warning following breakdown rather than waiting for high-temperature alarms. This can gain several hours allowing for repair work to be carried out prior to goods spoilage.
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. RL4803-434.075 – RL4803 Radio Transmitter with One Channel
  2. RL4804-434.075 – RL4804 Radio Transmitter with Two Channels


For Instrument specification, please click on the Hanwell Pro RL4803/4 transmitter datasheet.


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

Compatible products

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

Hardware Required:
SR2 – Smart Receiver
CR2 – Controller
REP – Repeater

88706 – AA Lithium battery

Manufactured by Hanwell | Ellab