| Agency Approvals | : | UL 916; CE: EN61000-6-2, EN61000-6-3, EN61000 Series, immunity, EN 61326-1; FCC Part 15 Class A; REACH, RoHS, RoHS 2 (China), RCM (Australia), ICES-003 (Canada), UKCA (UK) | 
| Collection | : | Plant Room Air Quality Sensors | 
| Enclosure Material | : | Polycarbonate; flammability rating UL 94 V0 | 
| Humidity Calibration Certificate | : | Replaceable RH element available in 1% & 2% with NISTcalibration certificate | 
| Humidity Measurement Accuracy | : | ±2% from 10 to 80% RH @ 25°C (77 °F) | 
| Humidity Measurement Linearity | : | Included in accuracy specification | 
| Humidity Measurement Resolution | : | 0.1% RH | 
| Humidity Output Range | : | 0 to 100% RH | 
| Humidity Sensor Type | : | Solid state capacitive, replaceable | 
| IP Protection | : | IP65 | 
| Input Specifications | : | 3-wire volt mode: 20 to 30 Vdc, 24 Vac, 50 to 60 Hz; loop powered: 20 to 30 Vdc | 
| Measurement Type | : | Relative Humidity / Temperature | 
| Operating Humidity | : | 0 to 95% RH non-condensing | 
| Operating Temperature | : | -35 to 60 °C (-31 to 140 °F) | 
| Output Specifications | : | Selectable 4 To 20 MA, 0 To 5 V, 0 To 10 V | 
| Outputs | : | Analog Output | 
| Temperature Measurement Accuracy | : | ±0.2 °C (±0.4 °F) typical | 
| Temperature Measurement Range | : | -35 to 60 °C (-31 to 140 °F) | 
| Temperature Measurement Resolution | : | 0.1 °C (0.1 °F) | 
| Temperature Sensor Type | : | 100 Ohm Platinum RTD | 
| Terminal Blocks | : | Screwless terminal block with spring actuator, 16-24 AWG | 
HD2 Series Analog Humidity Sensors provide an ideal solution for measuring relative humidity in a wide range of conditions. All models are equipped with a solid state capacitive humidity sensor that is easy to replace in the field. They are also equipped with a solid state temperature sensor that provides high accuracy measurements.
HD2XA2B is an all-in-one device combining humidity and temperature sensing. Intended for duct mount applications, the device ensures a building’s optimum temperature and humidity levels, resulting in greater energy efficiency. Each device is an active sensor that converts a humidity or temperature measurement into 4-20mA, 0 to 5 Vdc or 0 to 10 Vdc analog output.