ST-U21-B | Kele | Temperature Sensors & Transmitters
2.252K Universal Thermistor, WEL-B Brass Well Included
Brand:Kele
MPN:ST-U21-B
SKU:ST-U21B
product specifications
Accessory
T81U-XR, T85U-XR, T91U-XR, OSAB, F-1000-331
Enclosure Rating
NEMA 3R, IP22
Feature
Brass Well
Application
Air Handling Unit, Immersion Temperature
Probe Length
4.875 in
Sensor Element
2250 Ohm Thermistor
Type
Thermistor
Output Signal
Resistance
product series specifications
Accuracy: ±0.36°F (0.2°C)
Thermistor: ±0.36°F (0.2°C)
RTD:
Type 63: ±0.72°F (0.40°C)
Type 71: +/-0.0774°F (0.043°C)
Type 81, 85: ±0.27°F (0.15°C)
Type 91: ±0.54°F (0.30°C)
Sensor Type:
Thermistor: 2.252 kO, 3 kO, 10 kO Type II, III & III w/11K shunt, 20 kO, 100 kO
RTD:
Type 63: 1000O Nickel
Type 71, 81: 100O Pt 385 Curve
Type 85: 1000O Pt 385 Curve
Type 91: 1000O Pt 375 Curve
Temperature Range: -40° to 221°F (-40° to 105°C)
Temperature Coefficient: Thermistor: Negative temperature coefficient; RTD: Positive temperature coefficient
Temperature Stability:
Thermistor: 0.24°F (0.13°C) over five years
RTD: Max 0.04% after 1k hours @ 500 °F
Heat Dissipation: 2.7 mW/°C (power needed to raise the temperature by 1°C)
Enclosure Rating: NEMA 3R, UL 94V-0, plenum-rated plastic, IP22 UV protected with snap-off cover
Mounting: Directly to duct, immersion well, or OSA wall mount with appropriate bracket
Wiring Terminations: 8' (2.4m) of 24 AWG pigtails with pre-stripped ends, type 71 & 81 have 18" leads
Weight: Weight: 0.25 lb (0.1 Kg) w/o options
Approvals: CE
Warranty: Lifetime
product series features
- Lifetime warranty
- Flame retardant, plenum rated
- Wide selection of thermistor and RTD curves
- Adaptable with many mounting options
- 304 stainless steel probes
- Easy to mount to duct, well, or wall
- Waterproof probe
- Paintable plastic
- NEMA 3R, IP22
- Brass or stainless well
- Outside air kit
- Custom lengths
- Matched sensor pairs
- Ultra high accuracy optional
more information & related documents
Series Description
The Precon Model ST-U Universal Mount Sensor from PreCon provides precise remote temperature sensing in multiple applications such as duct, OSA, and immersion installations for Building Automation Systems, BAS. The active sensing element is a highly stable precision thermistor material or platinum RTD. The sensing element is sealed with a thermally conductive compound in a 4-7/8 in (12.38 cm) long stainless steel probe and is attached to a 2.5 in (6.35 cm) square enclosure. These sensors have tabs on the enclosure to provide mounting ears for direct duct mounting. They can be easily removed if they are not needed. This multipurpose enclosure minimizes the number of stock parts required to handle multiple applications.
Kele Description
TEMP SENSOR, DUCT, 2.252K, 4-7/8", NO ENCL, NO OUTPUT
Manufacturer
Kele
