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ACI A/RH3-20K-O-4X : Outside Air Relative Humidity Sensor, 3% Accuracy, RH Outputs: 0-5, 0-10 VDC & 4-20mA (Default), 20K Ohm Thermistor, NEMA 4X Duct Enclosure, Made in USA

ACI

MSRP: $363.00
$138.00
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SKU:
A/RH3-20K-O-4X
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ACI A/RH3-20K-O-4X : Outside Air Relative Humidity Sensor, 3% Accuracy, RH Outputs: 0-5, 0-10 VDC & 4-20mA (Default), 20K Ohm Thermistor, NEMA 4X Duct Enclosure, Made in USA

The ACI Relative Humidity with Thermistor Outside Air Series is a humidity transmitter designed for outdoor air monitoring and various applications. Here are the key features and information:

  • Sensing Element: The transmitter utilizes a thermoset polymer capacitive sensing element with a factory-applied hygroscopic filter. The filter enhances resistance to moisture, dust, and chemicals, ensuring long-term reliability.
  • Output Signal: The transmitter provides a proportional analog current or voltage output signal, allowing for compatibility with different systems.
  • DIP Switches: Integral DIP switches are included in the transmitter for easy field selection of the output signal and supply voltage, enabling customization to meet specific application requirements.
  • Test Options: The unit incorporates 0%, 50%, and 100% test options, facilitating verification of proper functioning and wiring of the transmitter.
  • Field Calibration: The transmitter supports field calibration using increment and decrement calibration DIP switches, eliminating the need for sensor element replacement.
  • Enclosure: The Outside Air configurations come with a weatherproof Euro style enclosure featuring a gasketed cover. The circuit boards are conformally coated for added resistance to moisture and chemicals.
  • Applications: The transmitter is suitable for monitoring outdoor air humidity, economizer control, and performing psychrometric calculations such as Enthalpy and Dew point. It can also be used in wash-down applications where resistance to moisture is crucial.

Specifications

RH Supply Voltage (Reverse Polarity Protected):

4-20 mA: 250 Ohm Load: 15 - 40 VDC / 18 - 28 VAC | 500 Ohm Load: 18 - 40 VDC / 18 - 28 VAC

0-5 VDC: 12 - 40 VDC / 18 - 28 VAC | 0-10 VDC: 18 - 40 VDC / 18 - 28 VAC

RH Output Signal: 2-wire: 4 - 20 mA (Factory Default) | 3-wire: 0-5 or 0-10 VDC and 4 - 20 mA (Field Selectable)
RH Measurement Range: 0-100%
Operating RH Range: 0 to 95% RH, non-condensing
RH Stability | Repeatability | Sensitivity: Less than 2% drift / 5 years | 0.5% RH | 0.1% RH
Nominal Thermistor Resistive Output @ 77°F (25°C) (Lead Wire Colors): 20KΩ(Brown/Blue)

 

Datasheets

pdf logo ACI Outside Air Relative Humidity and Temp Data Sheet
pdf logo ACI Outdoor Relative Humidity and Temp Installation
Sensor Type:
Outside Air
Humidity Element:
3%
Humidity Ouput:
4-20 mA, 0-5 VDC, or 0-10 VDC
Temperature Element:
20K
CO2 Element:
None
Display:
No Display
Enclosure:
NEMA 4X Enclosure