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ACI A/RH Series Relative Humidity Transmitters

Relative Humidity Transmitters
A/RH Series

The A/RH Series Relative Humidity transmitters, convert a resistance change 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 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 also allows the sensor to maintain its accuracy over a longer period of time. Despite its high 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 Series humidity transmitter is calibrated using a NIST Traceable Temperature /Humidity Chamber. Both three and five point calibration certificates are a vailable for 1% and 2% RH accuracies but they must be ordered separately.

All A/RH Series transmitters have a limited five year warranty.

• Single point Field Calibration
• Field selectable output signals
• 1%, 2%, 3%, and 5% Accuracies
• Low Drift
• Highly Repeatable
• Calibration Certificates Available Applications:
• Building Automation Systems
• Light Industrial
• Pharmaceutical
• Humidity Chambers
• Data acquisition
• OEM

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

Table 1Table 2Table 3
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Table 1Accuracy
RH1+/- 1%
RH2+/- 2%
RH3+/- 3%
RH5+/- 5%
3 PT NIST Certificate3 point Calibration Certificate @ 20, 50 and 80% RH
5 PT NIST Certificate5 point Calibration Certificate w/standard points choosen by ACI
Table 2Range if 1%
20% 40-60%Please Specify a 20% Span (i.e. 40-60%)
Table 3Configuration
RRoom
DDuct
OOutdoor Air
SPStainless Plate
Supply Voltage: 250 Ohm Load: +15 to 36 VDC / 21.6-26.4 VAC
0-5VDC: +15-36 VDC / 21.6-26.4 VAC
500 Ohm Load: +18 to 36 VDC / 21.6-26.4 VAC
0-10VDC: +18-36 VDC / 21.6-26.4 VAC
Power Consumption: 1 VA max.
RH Measurement Range: 0 to 100%
RH Output: 2-wire, 4 to 20mA (Factory Standard)
3-wire, 0-5, 0-10 VDC or 4 to 20mA
Accuracy @ 77oF: +/- 1% over 20% span (between 20 to 90%)
+/- 2%, 3%, or 5% from 20 to 95%
Long Term Stability: Less than 2% drift / 5 years
Hysteresis: Less than 0.4% RH
Repeatablity: 0.5% RH
Sensitivity: 0.1 % RH
Response Time: 110 seconds for 63% Step
Operating Temperature Range: -10 to 122oF (-23.3 to 50oC)
Operating Humidity Range: 0 to 95 % RH non-condensing
Saturation Response Time: 10 minutes for 63% Step


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