Fieldpiece ARH5
In-Duct Psychrometer Accessory Head

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Fieldpiece ARH5 Shown
Product Information
Datasheet 3.2 MB PDF Datasheet
Manual 2.4 MB PDF Datasheet
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  • Measures temperature and %RH
  • Calculates wet bulb and dew point
  • Slim 38" telescoping probe
  • Fast response time
  • Depth and direction indicators
  • Hands-free testing with stabilizing cone and magnetic hanger
  • Can send wireless measurements from up to 100' away

To assist HVACR professionals in getting the proper measurements, Fieldpiece engineered this in duct psychrometer head to take measurements in the duct where they are supposed to be taken -near the evaporator! So HVACR professionals can trust the results for tests like temperature splits, target evaporator exit temperture, target superheat, and CheckMe! because measurements are taken without the interference of outside air temp or leaks in the duct work.

The Fieldpiece ARH5 In Duct Psychrometer Accessory Head that measures temperatures and %RH in the prime location - in the duct, near the evaporator. It’s great for calculating target superheat as well as logging %RH, temp, WB or DP over time. The Fieldpiece ARH5 snaps directly onto Fieldpiece stick meters, data logger, electronic handles and adapters. Plus techs can get results wirelessly, like indoor wet bulb while they're at the condensor, when they use this accessory head with a wireless transmitter and wireless enabled Fieldpiece meter.

Fieldpiece ARH5 In-Duct Psychrometer Accessory Head can make hustling from condensor, to attic, and back again to take indoor wet bulb and charge a system, a thing of the past! When attached to a wireless transmitter, the Fieldpiece ARH5 measurements can be sent wirelessly to any Fieldpiece wireless meter (HG3, LT17AW, EH4W) from anywhere on the job site. So results like indoor wet bulb, can be read in real-time on your wireless meter from up to 100' away.

The Fieldpiece ARH5 accessory head was engineered specifically to put the right tools in the hands of HVACR professionals. For even more convenience and time savings, Fieldpiece designed the 38" telescoping probe with laser etching so techs know the sensor is in the correct location, and is facing in the proper direction. With the quick-response sensor it's a snap to complete target superheat, and take target evaporator exit temperature tests.

Temperature: Sensor type: Precision thermistor
Operating environment: -4°F to 140°F (-20°C to 60°C)
Range: -4°F to 140°F (-20°C to 60°C)
Resolution: 0.1°F / 0.1°C
Accuracy: ±(1°F) 32°F to 113°F
±(2°F) -4°F to 32°F, 113°F to 140°F
±(0.5°C) 0°C to 45°C
±(1°C) -20°C to 0°C, 45°C to 60°C
Output: 1mV to 1°F/°C
Relative Humidity: Sensor Type: Capacitance polymer film
Operating environment: 32°F to 131°F (0°C to 55°C)
Range: 0% to 100%RH
Accuracy: ±(2.5%) 10% to 90%RH
±(5%) 90%RH
Note: Above accuracies stated at 73.4°F (23°C).
Output: 1mV to %RH
Sensor Response Time: 60 seconds typical for 90% of total range
Sensor Hystersis: ±1%RH typical (Excursion of 10% to 90% to 10%RH)
Telescoping Probe Length: Up to 38 inches (97cm)
Probe Tip Diameter: 0.35 inch (9mm)
Storage temperature: -4°F to 140°F (-20°C to 60°C), 0 to 80% RH (with battery removed)
Temperature Coefficient: 0.1 x (specified accuracy)/°C (28°C)
Power: Single standard 9-volt battery, NEDA 1604, JIS 006P, IEC 6F22
Auto Power Off: Approx. 15 minutes
Battery life: 150 hours typical (alkaline)
Low Battery Indication: Red LO BATT LED will light to indicate low battery
Output Impedance 500Ω approx.
Dimensions: 144mm(H) x 67mm(W) x 32mm(D)
Weight: Approx. 240g, including battery
Ordering Information
Model Description Buy Online Price
ARH5  Fieldpiece ARH5 In-Duct Psychrometer Accessory Head Buy Now Sale $106.40
(Reg. $133.00)
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HG3 Fieldpiece HG3 Wireless HVAC Guide System Analyzer Buy Now Sale $372.00
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LT17AW Fieldpiece LT17AW Wireless Digital Multimeter Buy Now Sale $172.00
(Reg. $215.00)
EH4W Fieldpiece EH4W Wireless Electronic Handle and ET2W Wireless Transmitter Kit Buy Now Sale $106.40
(Reg. $133.00)