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Mounted through a duct wall, this transmitter measures relative humidity in the air stream to ±2% accuracy using a thermoset polymer capacitive element behind a hydrophobic filter. A matched 1,000 ohm nickel RTD shares the housing, so humidity and temperature reach the controller from a single duct penetration. Field-selectable outputs cover 0-5 and 0-10 V DC and 4-20 mA.
Mounted through a duct wall, this transmitter measures relative humidity in the air stream to ±2% accuracy using a thermoset polymer capacitive element behind a hydrophobic filter. A matched 1,000 ohm nickel RTD shares the housing, so humidity and temperature reach the controller from a single duct penetration. Field-selectable outputs cover 0-5 and 0-10 V DC and 4-20 mA.
The ACI Relative Humidity with Nickel RTD 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.
Features
Applications
| RH Measurement Range | 0 to 100% |
| Nickel RTD Sensor Accuracy | 32°F (0°C): ±0.72°F (0.4°F); 70°F (21.1°C): ±0.34°F (0.17°C); 130°F (54.4°C): ±1.00°F (0.56°C) |
| Nickel RTD Stability | ±0.05% after 1000 Hours @ 302°F (150°C) |
| 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 |
| 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) |
| 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 |
| 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) |
| Nickel RTD Din Standard | Din 43760 |
| Operating RH Range | 0 to 95% RH, non-condensing (Conformally Coated PCB's) |
| Nickel RTD (PTC) Output @ 70°F (21.1°C) (Wire Colors) | 1000 Ohms nominal (1K-Nickel RTD) | Red/Red |
| Temperature Coefficient | 6370 ppm/ °C |
| Operating Temperature Range | -40 to 140°F (-40 to 60°C) |
| Storage Temperature Range | -40 to 149°F (-40 to 65°C) |
| Product Dimensions (L x W x H) | 10.20 x 4.10 x 3.90" (259.1 x 104.1 x 99.1 mm) |
| Product Weight | 0.70 lbs (317 g) |
| Agency Approvals | UKCA, CE, RoHS, WEEE |
| RH Measurement Range | 0 to 100% |
| Nickel RTD Sensor Accuracy | 32°F (0°C): ±0.72°F (0.4°F); 70°F (21.1°C): ±0.34°F (0.17°C); 130°F (54.4°C): ±1.00°F (0.56°C) |
| Nickel RTD Stability | ±0.05% after 1000 Hours @ 302°F (150°C) |
| 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 |
| 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) |
| 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 |
| 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) |
| Nickel RTD Din Standard | Din 43760 |
| Operating RH Range | 0 to 95% RH, non-condensing (Conformally Coated PCB's) |
| Nickel RTD (PTC) Output @ 70°F (21.1°C) (Wire Colors) | 1000 Ohms nominal (1K-Nickel RTD) | Red/Red |
| Temperature Coefficient | 6370 ppm/ °C |
| Operating Temperature Range | -40 to 140°F (-40 to 60°C) |
| Storage Temperature Range | -40 to 149°F (-40 to 65°C) |
| Product Dimensions (L x W x H) | 10.20 x 4.10 x 3.90" (259.1 x 104.1 x 99.1 mm) |
| Product Weight | 0.70 lbs (317 g) |
| Agency Approvals | UKCA, CE, RoHS, WEEE |
