ML4109-DU RH/T Outdoor Radio Transmitter

Rugged Wireless outdoor temperature and humidity sensor

The ML4109 is a wireless outdoor temperature sensor with humidity monitoring using onboard sensors monitoring between -20°C to +60°C and 0-100%RH. This reliable transmitter is used with our renowned Hanwell Pro wireless system for 24/7 monitoring and alarm notifications. Contact us today for your free quotation and signal strength test (we can prove ours to be unrivaled) or to discuss your specific temperature monitoring requirements and application.


✓ Combined temperature & humidity measurement for outdoor use
✓ 50,000 data readings per channel & up to 2 years 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 and UKCA Marking
✓ Supplied with wall bracket

Typical Applications

• Outdoor comparative data monitoring


For Instrument specification, please click on the Hanwell Pro ML4109-DU 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
CR3 – Controller
REP – Repeater

88706 – AA Lithium battery

Manufactured by Hanwell | Ellab