HDH-ALARM has been designed for monitoring and control of CO2 levels in room spaces. The transmitters have built-in display and alarm LED for indicating high CO2 concentration. The transmitters have 2 x 0..10Vdc outputs for transmitting the CO2 measurement and the space temperature to BMS and control systems.

The display can be configured to show CO2 concentration, temperature or alternate the both measurements.

The alarm LED operation is configured by removing the unit cover and by setting the low CO2 limit and high CO2 limit. When the CO2 measurement exceeds to high setpoint the ALARM LED is emitting at the highest intensity.

The CO2 transmitter is automatically calibrated using ABCLogic™. ABCLogic™ is a patented self-calibration technique, that is designed to be used in applications where concentrations will drop to outside conditions (appr. 400 ppm) at least twice in a week period (= an unoccupied building). For applications that do not see periodic ambient conditions, ABCLogic™ can be turned off, but a regular single point calibration of the sensor in 6 -12 months is necessary. Checking and calibration is recommended every 5th year even if ABCLogic™ is on.

• Accurate and reliable CO2 and temperature measurement
• Self-calibration of zero point via ABCLogicTM
• ALARM LED for alerting high levels of CO2
• Display for CO2 and Temperature
• CO2 alarm limits configurable digitally and accurately
• 0..10Vdc Output for CO2 Concentration
• 0..10Vdc Output for Space Temperature
• 24Vac/dc Power Supply