NEW! TEMPERATURE
NEW!
TEMPERATURE
Immersion Thermistor and RTD Sensors
ST-W* Series
Description
TM
The PreCon Model ST-W* Immersion Thermistor and RTD
Sensor provides precision 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.
TCC-12
The sensing element is sealed with a temperature conductive
compound in a 4-7/8" (12.4 cm) stainless steel tube and
brass fitting. A brass thermowell is the standard well
provided with each sensor. A Greenfield connector is factory
installed for flexible connection. The sensor probe assembly
is removable from the thermowell for replacement without
draining the system.
Features
•
•
•
•
•
•
•
•
Lifetime warranty
±0.36°F (±0.2°C) thermistor accuracy
±1°F (0.53°C) RTD accuracy
Wide selection of thermistor and RTD curves
Brass thermowell for quick temperature response
Adaptable with many options
Easy to mount and remove from thermowell
Waterproof stainless steel probe
WEL-B
ST-W24
OPTIONS
Application
• 304 stainless steel well, maximum temperature 900°F
(482°C),maximum pressure 3000 psig (20,685 kPa)
• Handy-box enclosure
• Custom lengths (wells available)
• 1/2" LB conduit fitting
• Liquid-tight fitting
• Weather resistant box
• Matched pairs used for BTU measurement
• NIST Traceable
TEMPERATURE
The Model ST-W* is a waterproof sensor featuring a 304
stainless steel probe and brass fitting. The fitting has a 1/2"
NPT female threads to accept the standard Greenfield fitting.
It has 1/8" NPT male threads for installing into a furnished
WEL-B thermowell. The thermowells are designed with close
tolerances, eliminating the need for thermal grease under
normal conditions. Each well is designed so that the sensor
assembly can be easily removed after installation. The well
screws into a 1/2" NPT saddle (or Thredolet® fitting) furnished
by the installing contractor.
Specifications
Accuracy
Thermistor
RTD
Type 63
Type 71
Type 81, 85
Type 91
Sensor Type
Thermistor
RTD
Type 63
Type 71, 81
Type 85
Type 91 Temperature Range
Thermistor/RTD
March 2014
±0.36°F (0.2°C)
±0.72°F (0.40°C)
±0.054°F (0.03°C)
±0.27°F (0.15°C)
±0.54°F (0.30°C)
2.252 kΩ, 3 kΩ, 10 kΩ Type II, III, & III
w/11K shunt, 20 kΩ, 100 kΩ
1000Ω Nickel
100Ω Pt 385 Curve
1000Ω Pt 385 Curve
1000Ω Pt 375 Curve
-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
Heat Dissipation
2.7 mW/°C (power needed to raise
the temperature by 1°C)
Mounting
Directly to pipe in supplied brass
well, no adapters needed for
standard boxes, customer-supplied
1/2" Thredolet® required in pipe
Wiring Terminations 8' (2.44 m) of 24 AWG pigtails with
prestripped ends, type 71 & 81 have
18" leads
Approvals
CE
Weight
0.65 lb (0.3 kg) w/o well
Warranty
Lifetime
WE MAKE IT EASY.
kele.com
888-397-5353 USA
20
1211
TEMPERATURE
NEW!
Immersion Thermistor and RTD Sensors
ST-W* Series
Mounting
DIMENSIONS
Mounting
Install well into customer-supplied 1/2" FNPT saddle (or Thredolet®). Screw
sensor into the well via the 1/8" NPSM brass fitting.
Wiring
Terminate with butt splice or soldering. Twist on wire connectors are not
recommended. Basic model comes with 8' (2.4 m) of 24 AWG wire.
Greenfield
Fitting
1.37
(3.49)
1/2" NPT
1/8" NPSM
4.87
(XL)
(12.38)
5.13
(13.03)
Install the wells as shown to obtain
optimum well strength.
Flow
in
(cm)
Flow
3.25
(8.26)
0.25 (0.63)
Sensor
Angle must not allow end of well
to contact the other side of pipe.
Sensor in Well
ORDERING INFORMATION
TEMPERATURE
MODEL
ST-W3
ST-W11K
ST-W21
ST-W22
ST-W24
ST-W27
ST-W42
ST-W63
ST-W71
ST-W81
ST-W85
ST-W91
20
ST-W3
TCC-111
TCC-12
UR
1212
888-397-5353 USA
DESCRIPTION
10,000Ω immersion thermistor @ 77°F (25°C), Type III (gray leads)
10,000Ω immersion thermistor @ 77°F (25°C), Type III with 11K shunt (gray leads)
2252Ω immersion thermistor @ 77°F (25°C), Type II (green leads)
3000Ω immersion thermistor @ 77°F (25°C), Type II (blue leads)
10,000Ω immersion thermistor @ 77°F (25°C), Type II (yellow leads)
100,000Ω immersion thermistor @ 77°F (25°C), Type II (gray leads)
20,000Ω immersion thermistor @ 77°F (25°C), Type IV (green leads)
1000Ω nickel immersion RTD @ 32°F (0°C), (yellow leads)
100Ω ultra high accurate immersion RTD @ 32°F (0°C), 385 platinum curve (blue leads)
100Ω immersion RTD @ 32°F (0°C), 385 platinum curve (yellow leads)
1000Ω immersion RTD @ 32°F (0°C), 385 platinum curve (blue leads)
1000Ω immersion RTD @ 32°F (0°C), 375 platinum curve (green leads)
WELL DESIGNATION
–
Sensor with standard brass well
E
Sensor without well
S
Sensor with stainless steel well 900°F (482°C) max temp, 3000 psig (20.7 kPa) max pressure
OPTIONS
QD¼ Nylon insulated quick disconnect ¼"
X25
25' (7.6m) lead length 24 AWG
XC25 25' (7.6m) lead length jacketed cable
XCO ½" LB condulet fitting
XCP25 25' non-shielded plenum cable
XD
Dual sensors in one probe
XH
Handy box housing (factory installed)
XHP Non-metallic handy box housing ( factory installed)
XL
Custom length insertion probes 1" to 108"(Specify E without well)
XL2 in Custom length insertion probe, 2"(5.08 cm)(Specify E without well)
XL9
Custom length insertion probe, 9"(22.86 cm)(Specify E without well)
XLT
Liquid-tight fitting (factory installed)
XN
Certificate of conformance
XN1
NIST certificate, one reference point 32°F(0°C)
XN2
NIST certificate, two reference points 32°F/158°F(0°C/70°C)
XN3
NIST certificate, three reference points 32°F/77°F/158°F(0°C/25°C/70°C)
XNB ½" MNPT brass close nipple
XNG No Greenfield fitting(½" NPSM threads)
XNP ½" MNPT plastic close nipple
XP
Matched sensor pair, matched to ±0.1°F, 0.05°C (must order two sensors)
XPA
Ultra high accuracy, all thermistors, ±0.135˚F (0.075˚C)
XW
Weather resistant housing
XZ
Three wire RTD connections (Optional only on Type 81, standard on Type 71, not
available for use with XC25 & XCP25 options)
S
XP
Example: ST-W3-S-XP 10,000Ω Type III immersion sensor with a matched
10,000Ω Type III immersion sensor and stainless steel well
RELATED PRODUCTS
Thermal conductive compound 111 ml tub
Thermal conductive compound tube, 12 ml
Moisture-resistant three-wire butt splice
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When you need it right, right now, call Kele.
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March 2014
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