ACI A/RH2-20K-D-4X : Duct Relative Humidity Sensor, 2% 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 Duct Series utilizes a thermoset polymer capacitive sensing element with a factory fitted hydrophobic filter to improve its moisture resistance. The sensing elements multilayer construction also provides excellent resistance in applications where dust, dirt, oils and common environmental chemicals are found. The RH duct sensors include on board DIP switches which allow the user to select the desired output signal and can be powered by AC or DC power sources. Each unit also contains 0%, 50%, and 100% test options to verify that the transmitter is both working and wired properly. Field calibration can be performed by using the increment and decrement calibration DIP switches without the need to replace the sensing element. These enhancements provide increased flexibility and outstanding long-term reliability without the need to replace the sensors in the field.
Applications:
- Humidification
- Dehumidification
- Supply / Discharge / Return Air
- Economizers
- Clean Rooms
- Data Centers
- Process Control
- Schools
- Hospitals
- Office Buildings
Specifications
| RH Supply Voltage (Reverse Polarity Protected): | 4-20 mA / 0-5 VDC / 0-10 VDC |
| 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) Non-Linear NTC | RHx-20K Series: 20KΩ (Brown/Blue) |
Datasheets
 | ACI RH Duct Relative Humidity/Temp Data Sheet |
| ACI RH Duct Relative Humidity/Temp Installation |
- Sensor Type:
- Duct
- Humidity Element:
- 2%
- Output Signal:
- 4-20mA, 0-5 VDC, or 0-10 VDC
- Temperature Element:
- 20K
- CO2 Element:
- None
- Display:
- No Display
- VOC Element:
- None
- Probe Length:
- 8
- Enclosure:
- NEMA 4X Enclosure
- Supported Protocols:
- None
