Telog 41 Series

LoRaWAN Stand-Alone Data Loggers

The Telog 41 series is a range of Trimble Water's stand-alone data loggers that operate on LoRaWAN IoT networks.

LoRaWAN technology has become the standard for constructing IoT private wireless networks for long-distance, low-power communication, complementing public cellular LTE-M and NBIoT networks.

This range includes several models depending on the types of signals and instruments connected, for applications that are mainly in the areas of water and environment.

All these models are packaged in rugged waterproof housings, can withstand a large range of operating temperatures (-40°C/+70°C) and offer an autonomy of several years.

The Telog 41 recorders can be integrated into the Trimble Unity centralized supervision package.


Remote monitoring of measuring locations, on sites without power, mainly in the areas of water and environment:

  • Pressure and flow monitoring of drinking water distribution networks
  • Leak detection
  • Water level monitoring (reservoirs, aquifers...)
  • Remote reading of meters or flow meters (pulse or encoder outputs)
  • Rainfall stations
  • Equipment monitoring (On/Off status, alarms, operating times, etc.)
  • Detection of alert levels (overflows, floods...)

Main benefits

  • Long distance transmission and low power consumption
  • Long battery life using user-replaceable batteries
  • Large operating temperature range (-40°C/+70°C)
  • Ease of installation and commissioning
  • A wealth of monitoring tools in the Trimble Unity package



  • PR-41 for water pressure sensors
  • WL-41 for water level sensors
  • RG-41 for rain gauges
  • MTU-41 for water meters or flow meters with encoder outputs
  • PE-41 for instruments or equipment with pulse output or ON/OFF contact


  • Dimensions (H x W x D): 120 x 81 x 56 mm
  • Weight (MTU-41 / PE-41 / RG-41 models): 450 g (1 pound)
  • Weight (PR-41 / WL-41 models): 680 g (1.5 pounds)
  • Operating Temperatures: -40°C to +70°C
  • IP67 waterproof (submersible)
  • Material: Polycarbonate


  • Powered by user-replaceable internal Lithium battery
  • Autonomy: 5 years for 1 transmission/15 min (may vary depending on signal level)


  • 128 kb memory
  • Logging capacity: 28,000 time-stamped data readings (or 80,000 meter readings)
  • Configurable sampling rate (1 sec to 8h)


  • RS232 serial link by 4 pin IP67 connector


  • LoRaWAN bi-directional wireless technology, Class A
  • Secure access and exchanges using AES-128 encryption
  • Transmitting power: 18.5 dBm
  • Frequency: 915 MHz
  • Internal antenna (optional external antennas available)
  • Configurable or self-adjusting transmission frequency (depending on models)
  • Alarm notification on status or threshold violation


  • Models PR-41 and WL-41 (pressure and level measurements):
    — 1 input for pressure sensor with I2C series protocol.
    — sensor scale selectable from 1 to 500 psi
    — sensor accuracy: 0.1% of full scale
    — stainless steel collector, polyurethane collector
    — sensor mounting by 1/4'' NPT male threaded socket
  • Model RG-41 (Rain Gauges):
    — 1 input for tipping bucket rain gauge pulse
    — excitation contact 3 VDC/20 μA max.
    — minimum pulse duration 10 msec.
    — supplied with 2-wire sheathed cable (approx. 1 m)
  • Model MTU-41 (Encoder Counters):
    — 1 input for 6 to 9 digits encoder register signal
    — compatible with 3-wire AMR/AMI serial protocols (Sensus ECR, Neptune ProRead, Badger Meter ADE and HR-E, etc.)
  • Model PE-41 (Events and Pulse Counters):
    — 1 input for event detection (ON/OFF status) or pulse counting (1 Hz max.)
    — excitation contact 3 VDC/20 μA max.
    — minimum pulse duration 10 msec.
    — connection on 2-wire screw terminal block, via watertight connection

Related products

  • Pressure sensors with I2C output (PR-41 and WL-41 models)
  • LoRaWAN external antennas (for low coverage areas)
  • Trimble Unity Software Suite


Telog Serie - Diagram
Telog Serie - Diagram
Telog PT-DS-A Sensor
Telog MTU-41 - Meter Telemetry Unit
Telog PE-41 - Pulse/Event Recorder
Telog PR-41 - Pressure Recorder
Telog RG-41 - Rain Gauge Recorder
Telog WL-41 - Water Level Recorder
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