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ACI A/RH-TEMP Series Relative Humidity/ Temperature Combinations

Relative Humidity/ Temperature Combinations
A/RH-TEMP Series

The A/RH-TEMP Series Relative Humidity transmitters, convert a resistance to a linear 4 to 20 mA, 0 to 5 VDC, or 0 to 10 VDC output. The current signal may be transmitted over long distances on unshielded twisted-pair wire and will not be affected by the lead wire resistance or electrical noise.

The Advanced Ceramic Technology design overcomes the limitations of other resistance-based humidity sensors that utilize water soluble polymer coatings. The Advanced Ceramic Technology enables these sensors to recover fully from condensation. This allows the sensor to maintain its accuracy over a longer period of time. Despite its accuracy, the Advanced Ceramic Technology sensor and related circuitry is economical.

Accuracy is maintained over the entire operating range, using a thermistor for temperature compensation. Each A/RH-TEMP Series humidity transmitter is calibrated using an NIST Traceable Temperature and Humidity Chamber.

Any ACI thermistor, RTD, or temperature transmitter may be ordered with the A/RH transmitter. All A/RH-TT Room combination units will have a board mounted on the back of the enclosure. All A/RH-Temp Series transmitters have a limited five year warranty.

• Low Drift
• Highly Repeatable
• Temperature Sensor Ouput
• Field Selectable Output Signals
• Single Point Field Calibration using DIP Switches
• Lowers Inventory Cost

Select a link under the "item" tab below to order.

Table 1Table 2
Table 1Configuration
R2ORoom w/Override
R2ORoom w/Set Point*
R2SORoom w/Set Point &Override*
OOutdoor Air
SPStainless Plate
Table 2Temp Transmitter Output (if needed)
44 to 20mA Output
11-5 VDC Output
22-10VDC Output
Supply Voltage: 250 Ohm Load: +15 to 36 VDC / 24 VAC
500 Ohm Load: +18 to 36 VDC / 24 VAC
Power Consumption: 1 VA max.
RH Measurement Range: 0 to 100% RH
RH Output Signal:
2-wire, 4-20mA, 3-wire 0-5 or 0-10 VDC2-Wire Resistive, or 2-wire uA Output
2-wire, 4 to 20mA, or 3-wire, 1-5, 2-10 VDC
Temperature Sensor Output: 2-Wire Resistive, or 2-wire uA Output
Temperature Transmitter Output: 2-wire, 4 to 20mA, or 3-wire, 1-5, 2-10 VDC
Accuracy @ 77oF (25oC): +/- 1% over 20% Span between 20-95% RH
+/- 2, 3, or 5% from 20 to 95% RH
Repeatability: 0.5% RH
Hysteresis: Less than 0.4% RH
Long Term Stability: Less than 2% RH Drift / 5 Years
Response Time: 110 seconds for 63% Step
Saturated Response Time: 10 minutes for 63% Step
Operating Temp. Range: -10 to 122oF (-23.3 to 50oC)
Operating RH Range: 0 to 100% RH

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