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RH-Combo-Outdoor-Air-Nickel
Relative Humidity Outdoor Air with Nickel RTD Sensor
- Monitor Outdoor Air Humidity
- Economizer Control
- Psychrometric calculations such as Enthalpy and Dew point
- Wash down Applications
RH-Combo-Outdoor-Air-Nickel
From
Product Overview
- Applications Environmental Monitoring, Fluid Measurement and Control
- Electrical Connection Screw Terminal
- Enclosure Ratings UL94-5VB
- Filter Hydrophobic Filter
- Insulation Etched Teflon (PTFE) Colored Leads
- Current, Max 8 mA
- Measurement Type Humidity, Temperature
- Operating Temperature, Max 60 °C
- Operating Temperature, Min -40 °C
- Output Detail 0-5 VDC: 12 - 40 VDC / 18 - 28 VAC
- Relative Humidity 10 to 95%
- Relative Humidity Sensor Type Capacitive with Hydrophobic Filter
- Repeatability 0.5% RH,± 0.05°C
- Response Time 20 Seconds Typical
- Sensitivity 0.1% RH
- Series ID RH-Combo-Outdoor-Air-Nickel
- Stability RH Stability: Less than 2% drift / 5 years, Nickel RTD Stability: +/-0.05% after 1000 Hours @ 302°F (150°C)
- Storage Temperature, Max 65 °C
- Storage Temperature, Min -40 °C
- Supply Power Type DC
- Supply Voltage 24 Vdc
- Temperature Sensor Type 1,000 Ohm Nickel RTD
- Tightening Torque 4.43 to 5.31 lb-in (0.5 to 0.6 Nm)
- Wire Gauge 26 to 16 AWG
Supported Applications
The ACI Relative Humidity with Nickel RTD Outside Air Series is a transmitter designed for use in commercial heating and cooling building management systems. It monitors relative humidity and space temperature using an integrated capacitive sensing element and a Nickel RTD sensor.
- Commercial HVAC control applications
- Outside air monitoring
Operating Conditions & Performance
The series operates within a Relative Humidity range of 0 to 95% RH, non-condensing. The measurement output spans 0-100%. Accuracy specifications vary by selected model: +/- 1% over a 20% RH Range between 20 to 90%, or +/- 2% or 3% from 10 to 95%. Operating temperature is -40 to 140°F (-40 to 60°C), with storage capability up to 149°F (65°C). The typical response time (T63) is 20 seconds. Stability is rated at less than 2% drift over 5 years.
Configuration Options
Housings and Enclosures
- Euro (-EH): ABS Plastic, UL94-V0 rating; dimensions include a front view of 4.30" (109.22mm).
- NEMA 4X (-4X): Polystyrene Plastic, UL94-V2, NEMA 4X (IP 66) rating.
Sensors and Outputs
The series features a capacitive RH sensor with a hydrophobic filter. An optional Nickel RTD temperature sensor is available as part of the configuration. Output signals are field-selectable via integral DIP switches:
- 2-wire: 4-20 mA (Factory Default)
- 3-wire: 0-5 VDC or 0-10 VDC
Power and Connections
Screw terminal blocks accept wire sizes from 16 AWG to 26 AWG. Power supply requirements depend on the output configuration:
- 4-20 mA: 15 - 40 VDC / 18 - 28 VAC (Load dependent)
- 0-5 VDC or 0-10 VDC: 12 - 40 VDC / 18 - 28 VAC
Certifications and Options
The series carries CE, UKCA, RoHS, and WEEE approvals. Three-point NIST Calibration Certificates are available as an option.
Key Product Differences
Variants differ primarily by accuracy class (RH1 for +/- 1%, RH2 for +/- 2%, RH3 for +/- 3%) and enclosure type (-O for Euro, -4X for NEMA). Model numbers follow the format A/RH<Accuracy>-1K-NI-<Configuration>. The Nickel RTD sensor output is nominal 1 KΩ at 70°F (21.1°C) with Red/Red wire colors.
PDFs & Manuals
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