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Thermostat
Klixon Probe Packages
 
   
 
 
 
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ORDERING
Here’s a breakdown of our part numbering system for probe packages:

Field 1
21542
(or 21544, 21548, 21549)
Basic package describes general physical appearance and basic thermostat incorporated into device
Field 2
xx
Probe length times 2 (probe length is the length in inches from bottom of the hex to bottom of the device)
Field 3
xxx
Operating characteristics, assigned consecutively (Sensata will assign this number at the time your order is taken)
Field 4
xx
For wire leads, this is the length of wire in 6 inch increments (for 6" it would be 1, for 12" it would be 2, for 18" it would be 3, etc.). For connectors, contact Sensata Technologies for this code.

So, a ½" pipe thread/connector (see "Standard Part Numbers and Configurations" at right) with probe length of 3" and with an 18" wire lead would be numbered: 21549-06-xxx-03.

Site Updated September 19, 2017

* * * Sensata > Products > Klixon Brand > Thermostats > Precision Thermostats >

Klixon® Thermostat Probe Packages: Immersion Type
Extreme Temperature Protection Probe–Type Thermal Switches


These Klixon® snap–acting thermostat probes are designed to provide reliable, consistent performance over a long cycle life in the harshest of environments. These probes provide excellent shock and vibration resistance and operate as low as -65°F and as high as 550°F and incorporate the reliable Klixon M1 thermostat.

For more information, see the page of free drawings available or download the data sheet (file type: PDF).

Qualifications

UL/Canadian-UL Ratings
For 28303 series only: UL and Canadian-UL (File #E34618) (Go to UL online certifications directory web page)

Performance

The standard M1 utilizes silver contacts. Gold plated contacts can be furnished to assure reliable circuit switching under low wattage conditions. (See second table below.)

Ratings for UL and UL–Canadian for 28303 Series Package Devices
 
Max. Voltage
Max. Current Non–inductive
Max. Temp.
Cycles
Notes
UL
120 VAC
2.5 A
450°F
100,000
Break but not make, ungrounded cup
UL
110–300 VAC
720 VA
392°F
10,000
Make and break, ungrounded cup
UL
300 VAC
360 VA
392°F
10,000
Make and break, grounded or ungrounded cup
UL
24–240 VAC
120 VA
393°F
10,000
Make and break, grounded or ungrounded cup
UL–C
120 VAC
2.5 A
450°F
100,000
 

Contact Ratings (Resistive) Based on standard differential
30 VAC/DC
125 VAC
250 VAC
Life
Cycles
5.0 Amperes
2.5 Amperes
1.0 Amperes
100,000
5.5 Amperes
3.0 Amperes
1.5 Amperes
50,000
6.0 Amperes
4.0 Amperes
2.0 Amperes
25,000
6.5 Amperes
5.0 Amperes
2.5 Amperes
10,000
7.0 Amperes
6.0 Amperes
3.0 Amperes
5,000

Gold Contact Ratings (Resistive) Gold-plated contacts are not suitable for higher loads.
30 VAC/DC
500 mA and below
115 VAC
200 mA and below
230 VAC
100 mA and below

Characteristics
Contact Resistance
0.100 ohms per MIL-STD-202, Method 307
Dielectric Strength
1250 VAC, rms, 60 cycles for 1 minute, terminal to case 1000 VAC, 60 cycles for 1 minute, terminal to terminal with contacts open per MIL-STD-202, Method 301
Salt Spray Resistance
Per MIL-STD-202, Method 101, Condition B, 5% Solution
Ambient Temperature Range
-80°F to 550°F, (-62.2°C to 287.8°C)
Maximum ambient exposure while in the closed position is 200°F above contact closing temperature.
Operating Temperature Range
-65°F to 550°F, (-53.9°C to 287.8°C)

Operating Temperature
Differential
Tolerance *
°F
°C
°F
°C
±°F
±°C
-65 to -1
-53.9 to -18.4
30
16.7
12
6.7
0 to 200
-17.8 to 93.3
20
11.1
7
3.9
201 to 300
93.9 to 148.9
30
16.7
10
5.6
301 to 450
149.5 to 223.2
40
22.2
14
7.8
451 to 550
223.8 to 287.8
70
38.9
30
16.7
* Tolerances based on precision factory calibration and test equipment. Customers checking tolerances should allow for differences in test equipment of ±1°F. Temperature settings outside the ranges indicated or to closer tolerances will be considered on special request.

Configurations

Standard M1 probe packages are comprised of the following physical features, but many other variants are available. The standard material is stainless steel, but nickel plated brass versions are available.

PLEASE NOTE: The orientation of the connector with respect to the package body is not controlled.

Configuration Options - Custom configurations are available
Probe Body Thread Sizes
Standard lengths are available in ½" increments from 1.5" to 6".
Termination
Standard connector is a Sealtron B8002G-10SL-4P-F (or equivalent)
Standard wire leads are AWG #18 stranded wire with white or black Teflon* insulation (per MIL-W-22759) (Teflon is a trademark of E. I. Dupont de Namers and Co.)
Other
Other styles are available, as well as custom designs

Standard Part Numbers and Configurations - Many other styles are available, including SPDT. Also, see free drawings available for download.
21542
¾" - 16 thread/connector
21543
½" pipe thread/leads
21548
¾" - 16 thread/leads
21549
½" pipe thread/connector


For more information, see the page of free drawings available.
* * *
Klixon
Miniature Thermostats

Qualifications
For 28303 series only: UL and Canadian-UL (File #E34618) Go to UL online certifications directory web page



Drawing
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