ACI A/20K-D-18"-4X : Duct Temperature Sensor, 20K Thermistor, 18" Probe Length, NEMA 4X Enclosure
The ACI Thermistor Duct Series is a line of high-quality temperature sensors designed for precise air temperature measurement in HVAC applications. Featuring a durable stainless steel probe and two color-coded lead wires for easy identification, these thermistors are built to withstand demanding environments.
Key Features:
- Double encapsulation: ACI's unique double encapsulation process protects the sensor from moisture and ensures fast response times.
- Compact design: Ideal for smaller duct applications, the duct sensor includes an insulation pad for optimal sealing and vibration dampening.
- Accurate and reliable: These thermistors offer exceptional accuracy (±0.2°C) and a quick response time (10 seconds).
- Wide range of applications: Suitable for monitoring air temperatures in roof top units, air handlers, and supply,discharge, return, and mixed air ducts.
Specifications:
| Sensor Type | Sensor Curve: | Thermistor | Non-Linear, NTC (Negative Temperature Coefficient) |
| Number Sensing Points | Number Wires: | One | Two (Non-Polarity Sensitive) |
| Sensor Output @ 25°C (77°F) | (Lead Wire Colors): | A/20K: 20KΩ nominal | (Brown/Blue) |
| Sensor Accuracy 0-70°C (32-158°F): | +/-0.2°C (+/-0.36°F) |
| Response Time (63% Step Change): | 10 Seconds nominal |
| Sensor Operating Temperature Range: | -40°C (-40°F) to 150°C (302°F) |
| Enclosure Specifications (Temperature, Material, Flammability, NEMA/IP Ratings): | “-4X” Enclosure: Polystyrene Plastic, UL94-V2, -40 to 70°C (-40 to 158°F), NEMA 4X (IP 66) |
| Storage Temperature Range: | -40 to 85°C (-40 to 185°F) |
| Operating Humidity Range: | 10 to 95% RH, non-condensing |
| Probe Material | Probe Diameter: | 304 Stainless Steel | 0.250” (6.35mm) |
| Fitting Material | Flammability Rating: | Polyamide 66 (High Performance Nylon) | UL94-HB |
| Foam Pad Material | Flammability Rating: | Neoprene/EPDM/SBR Polymer | UL94-HBF; FMVSS-302; MIL-R-6130C |
| Conductor Size: | 22 AWG (0.65 mm) |
| Agency Approvals: | CE, RoHS2, WEEE |
Data Sheets
 | Technical Data Sheet – ACI Duct Thermistor Temperature Sensor |
| Instruction – ACI Duct Thermistor Temperature Sensor |
- Sensor Type:
- Duct
- Temperature Element:
- 20K
- Probe Length:
- 18
- Enclosure:
- NEMA 4X Enclosure
- Supported Protocols:
- None
- Humidity Element:
- None
- CO2 Element:
- None
- Setpoint:
- No Setpoint
- Override:
- No
- Display:
- No Display
