This snap–acting, probe–type thermal switch incorporates the
reliable Klixon
® 4286 thermostat.
These thermostat probes accurately open and
close within a narrow 2° to 8° F differential providing close temperature control in critical
applications.
For more information,
see the page of free drawings available or
download the data sheet (file type: PDF).
Performance
The standard narrow differential probe utilizes silver contacts. Gold plated contacts can be furnished to assure reliable circuit switching under low wattage conditions.
(See second table below.)
Contact Ratings (Resistive) Based on standard differential |
30 VAC/DC |
125 VAC |
Life Cycles |
2.0 Amps |
2.0 Amps |
250,000 |
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, per MIL-STD-202, Method 301 |
Salt Spray Resistance |
Per MIL-STD-202, Method 101, Condition B, 5% Solution |
Ambient Temperature Range |
-65°F to 400°F (-53.9°C to 204.4°C)
Maximum ambient exposure should be limited to 100°F above operating temperature for close on rise devices or 100°F below the operating temperature for open on rise devices. |
Operating Temperature Range |
0°F to +275°F, (-17.8°C to 135°C) |
The standard operating temperature ranges, differential and tolerances are shown in
the table below, but can be customized to meet your specific requirements.
Operating Temp.
Range |
Differentials
Available |
Closing Temperature Tolerance* |
Standard |
0 to 250°F
(-117.8 to 121.1°C) |
2 to 5°F
(1.1 to 2.8°C) |
+/- 5°F
(+/- 2.8°C) |
251 to 275°F
(121.7 to 135°C) |
3 to 8°F
(1.7 to 4.4°C) |
+/- 6°F
(+/- 3.4°C) |
* Tolerances are based on precision factory calibration and test equipment. Customers checking tolerances should allow for differences in test equipment of ±1°F. |
Configurations
Standard narrow differential probe packages are comprised of the following physical features, but many other variants are available to meet your needs.
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". Standard probe bodies are available with the following thread sizes:
¾" - 16
½" - 14 NPT |
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.) |
Finish |
The standard material is stainless steel |
Other |
Other styles are available, as well as custom designs |
Standard Part Numbers and Configurations - Many other styles are available Also, see free drawings available for download. |
21545 |
½" pipe thread with leads |
21546 |
¾" - 16 thread with connector |
21547 |
¾" - 16 thread with leads |
21550 |
½" pipe thread with connector |
