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HD9008T…-HD9009T… Series – Meteorological Temperature and RH Transmitter
Brand: Delta OHM S.R.L.The HD9008…and HD9009… series are single block RH and temperature (or only RH or only temperature) microprocessor transmitters, temperature configurable.
They are available in different versions:
- HD9008TRR: 2-wire with 4…20 mA output for RH and temperature
- HD9008T7AC: 2-wire with 4…20 mA output (only temperature)
- HD9008T7S – HD9008T17S: with RS485 MODBUS-RTU output
- HD9009TRR: 0…1 V standard voltage output (other ouputs available on demand) for RH and temperature
SENSORS
The humidity sensor is a capacitor which dielectric is made up by an hygroscopic polymer.
As water dielectric constant is approximately 80, you’ll get a strong change in capacity as the humidity content of this polymer changes.
The advantages of this kind of sensor are: good linearity, insensitivity to temperature changes, fast response time and long-lasting life.
The sensor temporary looses its accuracy if some condensation develops on its surface (the transmitted value is higher than the real one because of an increase in effective capacity).
The temperature sensor is a Platinum resistance thermometer (100Ω @0°C). The Pt100 resistance variation is transformed into a current or voltage signal, linear to temperature.
Specifications
Brand
Operating Temperature
- -40…+80° C
Output
- HD9008TRR, HD9008T7AC, HD9009TRR: analog
- HD9008T17S, HD9008T7S: RS-485 Modbus-RTU
Power Supply
- HD9008TRR, HD9008T7AC: 10…30 Vdc
- HD9008T17S, HD9008T7S: 5…30 Vdc
- HD9009TRR: 5…35 Vdc
Humidity Sensor
- HD9008TRR, HD9008T17S, : Capacitive
Humidity Measuring Range
- HD9008TRR, HD9008T17S, HD9009TRR: 0…100 %RH
Humidity Accuracy
- HD9008TRR, HD9008T17S, HD9009TRR: ± 1,5 % (0…90 %RH) / ± 2 % (90…100 %RH) @ T=15…35° C ± (1,5 + 1,5 % of the measure) % @ T= remaining range
Humidity Accuracy Response Time
- HD9008TRR, HD9008T17S, HD9009TRR:< 15 s @ 23° C (air speed = 1 m/s without filter)
Humidity Output Signal
- HD9008TRR: 0 % RH = 4.0 mA, 100 % RH = 20.0 mA
- HD9008T17S: RS-485 Modbus-RTU
- HD9009TRR: 0 %RH = 0.00 Vdc, 100 %RH = 1.00 Vdc
Humidity Load Resistance
- HD9008TRR: RLmax= (Vdc - 10)/ 22 mA
- HD9009TRR: RinMIN=10kΩ
Temperature Measuring Range - Standard
- 40…+80° C
Temperature Accuracy
- ± 0,2° C ± 0,15 % of the measure
Temperature Response Time
- < 15 s (without filter)
Temperature Output Signal
- HD9008TRR, HD9008T7AC:0 % RH = 4.0 mA, 100 % RH = 20.0 mA
Temperature Load Resistance
- HD9008TRR: RLmax= (Vdc - 10)/ 22 mA
Dimensions
- Ø 26 x 185 mm
Cable Dimensions Maximum Length for Analog Output Connection
- HD9008TRR, HD9008T7AC:200 m
- HD9008T17S, HD9008T7S: depending on Baud Rate and wire gauge
- HD9009TRR:10 m
Cable Dimensions Wire Minimum Section
- 20 AWG - 0.5 mm2
Cable Dimensions Cable Maximum Diameter
- Ø 5 mm
