Data Logger | LM-H PRO RF

The LM-RF series of wireless data logger is a new RF based data logger measuring 3 of the most vital parameters – temperature, % RH and differential pressure in industry. These data loggers are very useful in monitoring data across large facilities as they do not require any wiring. Deployment is very quick and easy. Data are sent by each device directly to the centralized moderator (repeater) device and from there to gtekNetTM software over ethernet port. These data can be accessed from any network connected device using standard web browser.

The data logger consists of RF radio transmitter and receiver operating at 869.88 MHz (SRD License Free: EU Version) frequency. These data loggers form a star network with its moderator. The moderator is connected to the client-server based gtekNetTM software through ethernet. A new data logger when it is in the range of the central node – moderator, gets connected to the gtekNetTM. Each device transmits its data to the moderator and is captured in gtekNetTM. Any parameter of the data logger when set / changed from gtekNetTM, first goes to the moderator and then to the device. These data loggers have an internal memory of 3000 data sets. In the event of communication failure between moderator and device or moderator and gtekNetTM, after reconnection, all the missed data will be synchronized by gtekNetTM automatically. This ensures that no data is missed.

  • RF based data logger
  • Up to 100m range (Line of Sight – Actual range may vary based on site condition)
  • No wiring required
  • Quick to deploy
  • Long battery life > 1year at 15min Store interval
  • High Accuracy, Temperature 0.5 °C; RH ±2 %
  • Resolution of 0.1
  • Upto 3000 data storage
Model No LM-H Pro - RF
Product Code 6211-x6
Display and Operator Panels
Display Type 3½ digit LCD Display
Status Indicator Unit Indication, High and Low Alarm Indication, Battery Status and storage on Indication
Analog Input Details
Sensor Types: (PCB mounted, Internal Sensors)
Temperature and %RH Solid-state
Range - Temperature: -20 to +60 °C
Range - % RH: 0 to 100%
Accuracy - Temperature: ± 0.5°C
Accuracy - % RH: ±2% RH between 20-80 %RH
±3% RH otherwise
Measurement Rate 5 min Default
Batch Storage / Data Memory Details
Start / Stop Remote Start – Stop through gtekNet
Store Interval 5 minutes to 18 Hrs
Memory Size 3000 records; Rollover
Temperature (Storage)-30˚C to 70˚C
Humidity (Storage) 5 to 90 % RH Non Condensing
Power Requirement
Supply Voltage Internal 2x1.5V 2500mAH battery size AA
Battery Life >12 months @ 25 Deg C, communication @ every 5 mins approx
RF Transmission 869.88 MHz (SRD License Free: EU Version)
Power Tx: 10dBm
Rx: -40dBm
Protocol Proprietary
Range 100m Line of Sight approx.
(may vary based on the field conditions and interferences)
Network Topology Star
RF Data Packet Standard IEEE 802.15.4, open communication architecture
Antenna Integrated on PCB Omnidirectional
Alarm Output
Alarm Set-point High/Low individually settable for each channel
Alarm Indication With Display Flashing and arrow to indicate High or Low
Overall Dimension
Dimension L x W x D (mm) 135 x 75 x 30 Approx
Protection IP 54

No Accessories are supported.