Your browser does not support JavaScript!
Product image V1_iSMA-B-LP800x800px_01.png

iSMA-B-LP Series

iSMA-B-LP is a room unit with 2.3” LCD display and four function buttons. Additionally, the room unit has a built-in temperature, humidity (option) and CO2 (option) sensors.

There are four different built-in sensors combination available, depending on hardware version:
• iSMA-B-LP. Temperature sensor only.
• iSMA-B-LP-H. Temperature + Humidity sensors.
• iSMA-B-LP-C. Temperature + CO2 sensors.
• iSMA-B-LP-HC. Temperature + Humidity + CO2 sensors.

iSMA-B-LP is powered with 24 V AC/DC and has the built-in RS485 port (Modbus RTU/ASCII and BACnet MSTP). Use of open communication protocol allows to connect the room unit with any controller supporting Modbus RTU/ASCII or BACnet MSTP. Together with iSMA-B-FCU controller, the room unit allows to change the basic parameters such as: temperature setpoint, fan speed, FCU mode and others.

Thanks to the built-in USB port, there is possibility to firmware update and room unit configuration without the necessity of power supply. iSMA-B-LP has the modern design and is available in different colours (white is basic) on client request.

Technical data


  • Baud rate: 2400 to 115200 bps
  • MINI USB, Type B
  • Protocol: Modbus, BACnet
  • 2x RJ 12 terminal (RS485 half duplex)

Temperature sensor

  • Type: 10k NTC
  • Range: 0 – 50°C
  • Accuracy: +/- 0,5°C
  • Resolution: +/- 0,1°C

CO2 sensor

  • Method Non Dispersive Infrared (NDIR), gold plated optics, diffusion sampling (with Telaire’s Patented ABC Logic Self Calibrated Algorithm)
  • Range: 400 – 2000 ppm
  • Accuracy: +/- 30 ppm OR +/- 3% of reading
  • Stability: < 2% of FS over life of sensor (15 years typical
  • Warm Up Time : < 2 minutes (operational); 10 minutes (maximum accuracy)
  • Calibration: ABC Logic Algorithm
  • Manual Calibration Interval: Not required

Humidity sensor

  • Range: 0-100% RH
  • Accuracy: +/- 2% RH in range 20 – 80% RH
  • Resolution: +/- 1% RH


  • ARM Cortex – M0+

Power supply

  • 24 V AC/DC

Ask about products

Contact us

See materials

Log in