Russian Comeco Temperature and Humidity Sensor - RH/T-e

1. Description of Russian Comeco Temperature and Humidity Sensor RH/T-e:

Using a thin-film sensor whose capacitance changes proportionally with the relative humidity of the medium, RHT measures the RH of air and non-corrosive gases and converts it into a standard 4-20mA 2-wire signal. A built-in temperature drift compensation system ensures good measurement stability, and an additional temperature sensor or second line transmitter can be built in to measure the relative humidity and temperature of the medium. The RH transmitter is factory calibrated and requires no custom adjustment, while the temperature transmitter can be additionally calibrated on site. The device is available in three different mounting and temperature range variants. All these features, combined with high protection rating, small size, and low price, make RHT a convenient solution for many RH measurement applications.

2. Russian Comeco Temperature and Humidity Sensor RH/T-eFeatures:

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

3. Russian Comeco Temperature and Humidity SensorRH/T-e Parameters:

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