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Vertiv Liebert TW420 and THW420
Environmental Sensors

Vertiv Liebert TW420 and THW420

Vertiv Products
Liebert Liebert Environmental Sensors
Vertiv Liebert TW420 Environmental Sensor for Temperature
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Vertiv Liebert THW420 Environmental Sensor for Temperature and Humidity
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Provides a communication interface from Liebert devices to a Building Management System or SiteScan SiteLink modules for remote monitoring and control via Modbus RTU or Liebert proprietary protocol.

Best Suited For:


  • Helps to avoid potentially hazardous problems
  • Easy to install
  • Transmission over long distances without degradation of the 4-20 mA signal


  • TW420 sensor monitors temperature;
  • THW420 sensor monitors temperature and humidity
  • Communicate to the Liebert Universal Monitor
  • Provides 4-20mA signals
  • Monitored temperature range of 45°F to 96°F (7°C to 35°C)
  • Monitored humdity range of 0 to 100% relative humidity

Infrastructure Management

Managing the Data Center Gap