
ST-R21R-X25 | Kele | Temperature Sensors & Transmitters
Bullet Temperature Sensor, 2252Ω Encapsulated Thermistor @ 77°F (25°C), Type II (Green leads), Rugged 3.5 Moistureproof Coating, 25' (7.6m) Lead Length 24 AWG
Brand:Kele
MPN:ST-R21R-X25
SKU:ST-R21R-X25
List Price:
$34.51
Today's Price:
$17.95
Log in for customized pricingproduct specifications
Accessory
T85U-XR, T81U-XR, T91U-XR, UR, DCP-1.5-W, DCPA-1.2
Feature
Rugged Coating
Application
Cold Water Systems, Hot Water Systems, Retrofit, Hydronic Heating Systems, Chillers
Housing Style
Bullet
Lead Length
25 ft
Probe Length
0.50 in
Sensor Element
2.2K Thermistor
Type
Thermistor
Output Signal
Resistance
product series specifications
Accuracy: ±0.36°F (0.28°C)
Thermistor: ±0.36°F (0.28°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 @ 70°F (21°C)
Type 71, 81: 100O Pt 385 Curve
Type 85: 1000O Pt 385 Curve
Type 91: 1000O Pt 375 Curve
Temperature Range: Thermistor/RTD: -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: 100% (no drift platinum)
Heat Dissipation: 2.7 mW/°C (power needed to raise the temperature by 1°C)
Mounting: Directly to wall or customer supplied enclosure using customer-supplied clips
Wiring Terminations: 8' (2.4m) of 24 AWG wire leads, type 71 & 81 have 18" leads
Weight: ST-R*:0.01 lb (0.005 Kg); ST-R*R: 0.05 lb (0.02 Kg)
Approvals: CE
Warranty: Lifetime
product series features
- Lifetime warranty
- Wide selection of thermistor and RTD curves
- Adaptable miniature sensor
- High heat dissipation constant
- Easy to mount with clips
- Pre-aged, highly stable thermistor material
more information & related documents
Series Description
The Precon ST-R, ST-R_R Series Encapsulated Sensors from PreCon provide precise remote temperature sensing for building automation systems and mechanical equipment room instrumentation. The active sensing element is a highly stable precision thermistor material or platinum RTD. The sensor is encapsulated with a low mass, high conductivity compound for good heat transfer characteristics. It is enclosed in a tough, miniature cylinder, 0.17 in (0.43 cm) diameter, which is small enough to be installed in most HVAC thermostat enclosures.
Kele Description
RAW RUGGED SENSOR 2252 OHM RUGGED 25 FT LEAD
Manufacturer
Kele