Demanding temperature and humidity of the application requirements of the RH series temperature and humidity transmitter can provide high-precision, long-term stability and reliable operation. The RH series is designed for monitoring and control of humidity or temperature and humidity in the building energy management systems, HVAC, commerce, residential, clean rooms, museums, atmospheric rooms and other space monitoring applications. The RH series two-wire transmitter is a 4-20mA loop output. The transmitter can be from 100% saturation state of recovery and are free calibration. Variety of installation methods optional pipeline installation and outdoor installation. Optional humidity measurement or temperature and humidity measurements. RHT is a set of temperature and humidity sensor measurements in one, providing a dual-channel 4-20mA output signal to control the temperature and humidity, and lower installation costs. This version can also choose a digital LCD local display to display the temperature and humidity. The temperature unit can be the scene ° F and ℃. 

 Physical properties 
 Relative humidity range :0-100% RH 
 Temperature range: -40 to 140 ℉ (-40 to 60 ° C) 
 Accuracy: ± 2% of 10 - 90% RH; ± 0.9 ℉ _AT_ 72 ℉ (± 0.3 ° C @ 25 ° C) 
 Temperature limits: -40 to 140 ℉ (-40 to 60 ° C) 
 Storage temperature: -40 to 176 ° F (-40 to 80 ° C) 
 Compensation temperature range: -4 to 140 ℉ (-20 to 60 ° C) 
 Power supply :10-35 VDC. 
 Output signal :4-20mA, 2 channels for temperature and humidity type (RH loop circuit) 
 Reaction time: 15 seconds 
 Electrical Connections: Screw terminal box 
 Pipeline connections: 1/2NPS; outdoor installation: 1/2 "(22.3mm) 
 Drift: <1% RH / year 
 RH sensor: capacitive polymer 
 Temperature Sensor: Solid state band gap. 
 Shell Material: pipe installation: of PBT outdoor installation: polycarbonate 
 Degree of protection: NEMA 4X (IP65) 
 Display: Optional 2-line alphanumeric 8 character / line 
 Display resolution: RH: 0.1%; 0.1 ℉ (0.1 ° C) 
 Weight: pipeline connection: 0.6 lb (0.3 kg); outdoor installation: 1 lb (0.45 kg) 
 Certification: CE