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Mounted through an outside wall, this transmitter measures relative humidity in outdoor air to ±2% accuracy using a thermoset polymer capacitive element behind a hydrophobic filter. A matched 10,000 ohm Type II thermistor shares the housing, so humidity and temperature reach the controller from one weatherproof housing. Field-selectable outputs cover 0-5 and 0-10 V DC and 4-20 mA.
Mounted through an outside wall, this transmitter measures relative humidity in outdoor air to ±2% accuracy using a thermoset polymer capacitive element behind a hydrophobic filter. A matched 10,000 ohm Type II thermistor shares the housing, so humidity and temperature reach the controller from one weatherproof housing. Field-selectable outputs cover 0-5 and 0-10 V DC and 4-20 mA.
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.
Features
Applications
| RH Measurement Range | 0 to 100% |
| RH Accuracy @ 77°F (25°C) | ± 1% over 20% RH Range between 20 to 90% | ± 2% or 3% from 10 to 95% |
| RH Stability | Repeatability | Sensitivity | Less than 2% drift / 5 years | 0.5% RH | 0.1% RH |
| Thermistor Accuracy 32 to 158°F (0 to 70°C) | ± 0.36°F (0.2°C) |
| RH Output Load Resistance | 4 to 20 mA: 700 Ohms maximum | 0 to 5 V DC or 0 to 10 V DC: 4K Ohms Minimum |
| RH Output Signal | 2-wire: 4 to 20 mA (Factory Default) | 3-wire: 0 to 5 or 0 to 10 V DC and 4 to 20 mA (Field Selectable) |
| RH Response Time (T63) | 20 Seconds Typical |
| RH Transmitter Stabilization Time | 30 Minutes (Recommended time before doing accuracy verification) |
| Thermistor Sensor Response Time (T63) | 10 Seconds nominal |
| RH Supply Current (VA) | Voltage Output: 8 mA maximum (0.32 VA) | Current Output: 24 mA maximum (0.83 VA) |
| RH Supply Voltage (Reverse Polarity Protected) | 0 to 5 V DC: 12 to 40 V DC / 18 to 28 V AC | 0 to 10 V DC: 18 to 40 V DC / 18 to 28 V AC |
| Thermistor Power Dissipation Constant | 3 mW/°C |
| RH Sensor Type | Capacitive with Hydrophobic Filter |
| Lead Wire Length | Conductor Size | 14" (35.6 cm) | 22 AWG (0.65 mm) |
| 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) |
| Insulation | Rating | Etched Teflon (PTFE) Colored Leads | Mil Spec 16878/4 Type E |
| Operating RH Range | 0 to 95% RH, non-condensing (Conformally Coated PCB's) |
| Nominal Thermistor Resistive Output @ 77°F (25°C) (Lead Wire Colors) | 10KΩ (White/Green) |
| Operating Temperature Range | -40 to 140°F (-40 to 60°C) |
| Storage Temperature Range | -40 to 149°F (-40 to 65°C) |
| Product Weight | 0.59 lbs (268 g) |
| Agency Approvals | CE, UKCA, RoHS, WEEE |
| RH Measurement Range | 0 to 100% |
| RH Accuracy @ 77°F (25°C) | ± 1% over 20% RH Range between 20 to 90% | ± 2% or 3% from 10 to 95% |
| RH Stability | Repeatability | Sensitivity | Less than 2% drift / 5 years | 0.5% RH | 0.1% RH |
| Thermistor Accuracy 32 to 158°F (0 to 70°C) | ± 0.36°F (0.2°C) |
| RH Output Load Resistance | 4 to 20 mA: 700 Ohms maximum | 0 to 5 V DC or 0 to 10 V DC: 4K Ohms Minimum |
| RH Output Signal | 2-wire: 4 to 20 mA (Factory Default) | 3-wire: 0 to 5 or 0 to 10 V DC and 4 to 20 mA (Field Selectable) |
| RH Response Time (T63) | 20 Seconds Typical |
| RH Transmitter Stabilization Time | 30 Minutes (Recommended time before doing accuracy verification) |
| Thermistor Sensor Response Time (T63) | 10 Seconds nominal |
| RH Supply Current (VA) | Voltage Output: 8 mA maximum (0.32 VA) | Current Output: 24 mA maximum (0.83 VA) |
| RH Supply Voltage (Reverse Polarity Protected) | 0 to 5 V DC: 12 to 40 V DC / 18 to 28 V AC | 0 to 10 V DC: 18 to 40 V DC / 18 to 28 V AC |
| Thermistor Power Dissipation Constant | 3 mW/°C |
| RH Sensor Type | Capacitive with Hydrophobic Filter |
| Lead Wire Length | Conductor Size | 14" (35.6 cm) | 22 AWG (0.65 mm) |
| 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) |
| Insulation | Rating | Etched Teflon (PTFE) Colored Leads | Mil Spec 16878/4 Type E |
| Operating RH Range | 0 to 95% RH, non-condensing (Conformally Coated PCB's) |
| Nominal Thermistor Resistive Output @ 77°F (25°C) (Lead Wire Colors) | 10KΩ (White/Green) |
| Operating Temperature Range | -40 to 140°F (-40 to 60°C) |
| Storage Temperature Range | -40 to 149°F (-40 to 65°C) |
| Product Weight | 0.59 lbs (268 g) |
| Agency Approvals | CE, UKCA, RoHS, WEEE |
