RL4809 4-20mA transmitter

4-20mA transmitter for various monitoring solutions

Part of the Hanwell RL4800 series of radio transmitters, the RL4809 is a 4-20mA transmitter with dual 4-20mA input for use internally or externally.


✓ 2 x 4-20mA input for pump, machine, level and door alerts
✓ 50,000 data readings per channel & up to 18 months battery life
✓ Superior performance hardware & high accuracy sensors
✓ Easily accessible battery
✓ Low power radio for long distance transmission (3km over open ground)
✓ Complies with RoHS, EU & WEEE directives
✓ Carries CE Marking

Typical Applications

• Level measurement
• Door open/close alerts
• Machine on/off alerts


For Instrument specification, please click on the Hanwell Pro RL4809 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

Y119 – Wall mounting bracket
88706 – AA Lithium battery

Contact us for more information about how you can use our 4-20mA transmitters. Alternatively speak to us about your specific application.

Manufactured by Hanwell | Ellab