ACI Humidity, Temperature and Outside Air Sensor

FEATURES

The ACI Relative Humidity with Thermistor Outside Air Series utilizes a thermoset polymer capacitive sensing element with factory applied hygroscopic filter to deliver a proportional analog current or voltage output signal. The hygroscopic filter provides added resistance to moisture, dust, and other chemicals for greater long-term reliability. The RH Outside Air transmitter features integral DIP switches for field selection of the proper output signal and supply voltage to meet your applications requirements. Each unit also contains 0%, 50%, and 100% test options to verify that the transmitter is both working and wired properly. Field calibration also 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. Outside Air configurations feature a weatherproof Euro style enclosure with gasketed cover and conformally coated circuit boards for added moisture and chemical resistance.

• The ACI RH Thermistor Outside Air is covered by ACI’s Five Year Limited Warranty

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 Supply Current (VA): Voltage Output: 8 mA maximum (0.32 VA) | Current Output: 24 mA maximum (0.83 VA)
• RH Output Load Resistance: 4-20 mA: 700 Ohms maximum | 0-5 VDC or 0-10 VDC: 4K Ohms Minimum
• 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 Accuracy @ 77°F (25°C): +/- 1% over 20% RH Range between 20 to 90% | +/- 2% or 3% from 10 to 95%
• RH Measurement Range: 0-100%
• Operating RH 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
• RH Response Time (T63): 20 Seconds Typical
• RH Sensor Type: Capacitive with Hydrophobic Filter
• RH Transmitter Stabilization Time: 30 Minutes (Recommended time before doing accuracy verification)
• RH Connections | Wire Size: Screw Terminal Blocks (Polarity Sensitive) | 16 (1.31 mm²) to 26 AWG (0.129 mm²)
• RH Terminal Block Torque Rating: 4.43 to 5.31 lb.-in (0.5 to 0.6 Nm)
• RH 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): 10KΩ (White/Green)
• Thermistor Accuracy 32-158°F (0-70°C): +/- 0.36°F (0.2°C) except
• Thermistor Power Dissipation Constant: 3 mW/°C
• Thermistor Sensor Response Time (T63): 10 Seconds nominal
• Lead Wire Length | Conductor Size: 14” (35.6 cm) | 22 AWG (0.65 mm)
• Insulation | Rating: Etched PTFE Colored Leads | Mil Spec 16878/4 Type E
• Agency Approvals: CE, UKCA, RoHS, WEEE