ACI A/20K-S-4X : Strap-On Temperature Sensor, 20K Thermistor, 1-1/4" to 4" Pipe Size, 14" Etched Teflon Leads, NEMA 4X Enclosure, 5-Year Warranty, Made in USA

ACI A/20K-S-4X : Strap-On Temperature Sensor, 20K Thermistor, 1 1/4" (32mm) to 4" (100mm) Pipe Size, NEMA 4X Enclosure

Applications:

• Cold Water Systems
• Hot Water Systems
• Retrofit
• Hydronic Heating Systems
• Chillers

The ACI Thermistor Strap-On Series features a 1.5” square copper plate with the sensor encapsulated to the back side of the plate to improve the thermal conductivity between the pipe and the sensor when an Immersion style sensor can’t be inserted into the pipe. Each sensor has two, 14 inch 22 AWG Etched Teflon colored lead wires to differentiate the different sensor types. The sensors in this series are manufactured using ACI’s proven double encapsulation process to eliminate the effects of moisture upon the sensors as well as to improve the thermal response times using our high quality, thermally conductive epoxy. The Strap-On Series sensors can be used to monitor pipe sizes from 1 1⁄4” to 10” in diameter. For best accuracy and increased thermal conduction between the pipe and the sensor, ACI recommends cleaning the pipe before applying thermal grease as well as to insulate the sensor from the effects of the ambient air. Optional weatherproof enclosure and NIST certificates are available upon request.

• Sensor Type | Sensor Curve: Thermistor Non-Linear NTC (Negative Temperature Coefficient)
• Number Temperature Sensing Points: One
• Number Wires: Two (Non-Polarity Sensitive)
• Sensor Output @ 25 °C (77 °F) (Lead Wire Colors):
  • A/CP (Type II): 10KΩ nominal | (White/Green)
  • A/AN (Type III): 10KΩ nominal | (White/White)
  • A/20K: 20KΩ nominal | (Brown/Blue)
• Accuracy 0-70°C (32-158°F): +/- 0.2°C (+/-0.36°F) except A/10K-E1 Series: +/-0.3°C (+/-0.54°F) A/1.8K Series: +/-0.5°C @ 25°C (77°F) and +/-1.0°C (+/-1.8°F)
• Stability: Sensor Dependent; Contact ACI for more information on the sensor in question.
• Response Time (63% Step Change): 30 Seconds nominal
• Power Dissipation Constant: 3 mW/°C except A/1.8K Series: 1 mW/°C | A/10K-E1 Series: 2 mW/°C
• Enclosure Specifications, Operating Temperature Range, Ratings:
  • A/XX-S-GD: Galvanized Steel, -40 to 93°C (-40 to 200°F), NEMA 1 (IP 10)
  • A/XX-S-PB: ABS Plastic, -30 to 85°C (-22 to 185°F), UL94-HB, Plenum Rated
  • A/XX-S-4X: Polystyrene Plastic, -40 to 70°C (-40 to 158°F), UL94-V2, NEMA 4X (IP 66)
• Storage Temperature Range: -40 to 80°C (-40 to 176°F)
• Operating Humidity Range:10 to 95% RH, non-condensing
• Pipe Mount Sensor Enclosure Material: 14” (35.6cm) | 22 AWG (0.65mm)
• Acceptable Pipe Size:A/X-S-XX: 1 1/4” (32mm) to 4” (100mm); A/X-S10-XX: 2” (50mm) to 10” (250mm)
• Foam Material | Flammability Rating: Neoprene/EPDM/SBR Polymer | UL94-HF1; MIL-R-6130C; FMVSS-302
• Lead Length | Conductor Size:
  • A/XX-S-XX: 14” (35.6cm)
  • A/XX-S10-XX: 22 AWG (0.65mm)
• Lead Wire Insulation | Wire Rating: Etched Teflon (PTFE) Colored Leads | MIL-W-16878/4 (Type E)
• Conductor Material:Silver Plated Copper
• Product Dimensions:See Drawing on Back of Data Sheet
• Product Weight:
  • A/XX-S-GD: 0.80 lbs. (0.37kg)
  • A/XX-S-PB: 0.40 lbs. (0.18kg)
  • A/XX-S-4X: 0.55 lbs. (0.25kg)
• Agency Approvals: CE, RoHS2, WEEE

Datasheets

	ACI Strap On Data Sheet
	ACI Strap On Installation
	Thermistor Curve