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2-wire Humidity Transmitter - RHT

• Low cost
• Temperature compensation system
• Two 2-wire transmitters for RH and temperature
• Optional built-in Pt temperature sensor
• Optional stainless steel sintered filter
• IP65 protection
• Operating Ambient temperature: -10~60 °C
• Operating Ambient humidity: 0-98 %RH, non-condensing

Model Number: RHT
Data Sheet:

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Product Specification

2-wire RH/T Transmitter RHT

• Low cost
• Temperature compensation system
• Two 2-wire transmitters for RH and temperature
• Optional built-in Pt temperature sensor
• Optional stainless steel sintered filter
• IP65 protection

Using thin-film sensor with capacitance changing proportionally to medium relative humidity, RHT measures RH of air and non-aggressive gases and converts it into standard 4-20mA 2-wire signal. A built-in temperature drift compensation system guarantees good stability of measurement and an additional temperature sensor or second 2-wire transmitter may be built-in for measurement of both medium relative humidity and temperature. The RH transmitter is factory calibrated and does not need custom adjustment, while the temperature transmitter can be additionally calibrated on-site. The device is available in 3 variants with different mounting and temperature ranges. All this, in addition to the high protection class, the small size, and the low price, make RHT a convenient solution for many RH measurement applications.

RHT 2-wire Humidity Transmitter Technical specifications

Input
Humidity	capacitive sensor, 0 - 100 %RH
Temperature (option)	Pt100...1000 (w=1.385), -20 ~ 90 °C
RH adjustment	not needed (factory set)
Temperature ZERO adjustment	± 20%
Temperature SPAN adjustment	± 20%
Output
RH current output	4 - 20 mA, 2-wire
- input range correspondence	0 - 100 %RH
Temperature current output (option)	4 - 20 mA, 2-wire
Linearity proportional to	measured value
RH output limit	100% RH for condensation
Power supply
Supply voltage	8 - 36 VDC
Admissible variations	1 Vp-p at 50 Hz
Maximum line load	800 Ω at 24V/20mA
Accuracy
RH measurement error	≤ 2.5% from span
Temperature measurement error	≤ 0.5% from span
Non-linearity	within measurement error
Temperature drift for RH	0.05% from span for 1°C
Temperature drift for temperature	0.01% from span for 1°C
Operating conditions
Ambient temperature	-10 ~ 60°C
Ambient humidity	0 - 98 %RH, non-condensing
Design and materials
Case material	ABS plastic
Sensor protection	plastic cap with stainless steel mesh
Sintered filter (option)	stainless steel, 75 μm
Wiring	screw terminals inside housing
Protection class	IP65 (NEMA 4, 4x)

RHT 2-wire Humidity Transmitter Ordering code RHT* - G6 - #1.#2

Code	Feature or option	Code values
*	Variant	A - for wall mounting, B - for in-hole mounting, D - high-temperature
G6	Stem length 'n' [mm]	100…500 (step 10 mm)
#1	Built-in temperature sensor / transmitter	X - none, D - Pt100, F - Pt500, G - Pt1000, TT - 2-wire transmitter
#2	Sintered filter	X - none, S - sintered filter mounted