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RH Outside Air Thermistor

This product is covered by ACI's Five (5) Year Limited Warranty. Learn more

Product overview

Relative Humidity, RH Outputs: 0-5, 0-10 VDC & 4-20mA (Default), Outside Air, ± 2% Accuracy, 100,000 Ohm Thermistor, Euro Enclosure

Application

  • Monitor Outdoor Air Humidity
  • Economizer Control
  • Psychrometric calculations such as Enthalpy and Dew point
  • Wash down Applications

Product specifications

Supply Voltage:
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
Supply Current:
Voltage Output: 8 mA maximum (0.32 VA) Current Output: 24 mA maximum (0.83 VA)
Output Load Resistance:
4-20 mA: 700 Ohms maximum 0-5 VDC or 0-10 VDC: 4K Ohms Minimum
Output Signals:
2-wire: 4 - 20 mA (Factory Default) 3-wire: 0-5 or 0-10 VDC and 4 - 20 mA (Field Selectable)
Accuracy @ 77°F (25°C):
Model Dependent: +/- 1% over 20% RH Range between 20 to 90% | +/- 2%, or 3% from 10 to 95%
RH Measurement Range:
0-100%
Operating Humidity Range:
0 to 95% RH, non-condensing (Conformally Coated PCB’s)
Operating Temperature Range:
-40 to 140°F (-40 to 60°C)
Storage Temperature Range:
-40 to 149°F (-40 to 65°C)
RH Stability | Repeatability | Sensitivity:
Less than 2% drift / 5 years | 0.5% RH | 0.1% RH
Response Time (63% Step Change):
20 Seconds Typical
RH Sensor Type:
Capacitive with Hydrophobic Filter
RH Transmitter Stabilization Time:
30 Minutes (Recommended time before doing accuracy verification)
Connections | Wire Size:
Screw Terminal Blocks (Polarity Sensitive) | 16 (1.31 mm²) to 26 AWG (0.129 mm²)
Terminal Block Torque Rating:
4.43 to 5.31 lb-in (0.5 to 0.6 Nm)
NIST Test Points:
Default Test Points: 3 Points (20%, 50% & 80%) 1% NIST Test Points: 5 Points within selected 20% Range (ie. 30%-50% are 30, 35, 40, 45 & 50)
Nominal Thermistor Resistive Output @ 77°F (25°C) (Lead Wire Colors):
RHx-1.8K Series: 1.8K (Red/Yellow) RHx-3K Series: 3K (White/Brown) RHx-AN Series (Type III): 10K (White/White) RHx-AN-BC Series: 5.238K (White/Yellow) RHx-CP Series (Type II): 10K (White/Green) RHx-CSI Series: 10K (Green/Yellow) RHx-10KS Series: 10K (White/Blue) RHx-10K-E1 Series: 10K (Gray/Orange) RHx-20K Series: 20K (Brown/Blue) RHx-50K Series: 50K nominal (Brown/Yellow) RHx-100KS Series: 100K (Black/Yellow)
Accuracy 0-70ºC (32-158ºF):
+/- 0.36°F (0.2°C) except 10K-E1 Series: +/- 0.54°F (0.3°C) 1.8K Series: +/- 0.9°F (0.5°C) @ 77°F (25°C) & +/- 1.8°F (1.0°C) from 32 to 158°F (0 to 70°C)
Power Dissipation Constant:
3 mW/°C except 1.8K Series: 1 mW/°C; 10K-E1 Series: 2 mW/°C
Response Time (63% Step Change):
10 Seconds nominal
Lead Length | Conductor Size:
14” (35.6 cm) | 22 AWG (0.65 mm)
Insulation | Rating:
Etched Teflon (PTFE) Colored Leads | Mil Spec 16878/4 Type E
Enclosure Specifications (Material, Flammability, Temperature, NEMA/IP Rating):
“-EH” Enclosure: ABS Plastic; UL94-V0; -40 to 140°F (-40 to 60°C) “-4X” Enclosure: Polystyrene Plastic; UL94-V2; -40 to 158°F (-40 to 70°C); NEMA 4X (IP 66)
Sensing Tube Dimensions (Length x Diameter):
“-EH” Models: 3.00” (76.20 mm) x 1.125” (28.75 mm) “-4X” Models: 4.73” (120.14 mm) x 0.845” (21.46mm)
Product Weight:
A/RHx-xx-O Series: 0.59 lbs. (0.27 kg) A/RHx-xx-O-4X Series: 0.45 lbs. (0.204 kg)
Agency Approvals:
CE, RoHS2, WEEE

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