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CPl's SNAP-STAT thermal switches have a bimetal snap disc that actuates a miniature microswitch. This double snap action makes these switches virtually immune to shock and vibration. Epoxy sealing or glass-to-metal hermetic sealing makes them ideal for demanding industrial or military applications.

The SNAP-STAT's SPDT action provides both control and indication at the same time - two functions from one switch. Or it can be used as a SPST thermal switch. Calibration temperature range is 0°F to 350°F with a tolerance of +/- 7°F. (Dual temperature SNAP-STAT incorporates two separate temperature controls in one mounting). The basic SNAP-STAT switch mechanism AD060 shown is available and is suitable for gluing or clamping in place. We can also design custom brackets for your use.

APPLICATIONS FOR CPI SNAP-STAT THERMAL SWITCHES.

CPI SNAP-STAT thermal switches offer a broad array of mounting, probe and termination options for a diverse roster of industrial applications including over-temperature on air compressors, food extruders, distilling machines, industrial steam cleaners, clutches/brakes/transmissions, escalators and elevators. CPI SNAP-STATS are specified where reliability is critical in aircraft fuel systems, environmental control systems, medical equipment such as lasers, incubators, sophisticated electronic equipment including government communication systems and fuel cells.

BASIC SNAP-STAT SWITCH AD060

The basic SNAP-STAT switch shown here, and almost all SNAP-STAT switches, have the same wiring diagram indicated. Exceptions are shown in the listings for each model.

HOW CPI SNAP-STAT SWITCHES WORK

When heat is applied to the bimetal disc, the disc reverses from convex to concave. This reversal of the disc operates the microswitch causing the normally open side to close and the normally closed side to open. When the disc cools, it reverts back to its normal condition, releasing the microswitch and reversing the electrical actions.

Bases of the SNAP-STATS are thin for good heat conductivity, and the ring supporting the snap disc is made of aluminum to help conduct the heat into the disc.

SPECIFICATIONS

Calibration temp (factory set): 0°F Min. to 350°F Max. (Specify close on rise or close on fall).

Tolerance: +/- 7°F (Tighter tolerances available)

Repeatability: +/- 3°F under standardized conditions

Actuation/Deactuation differential: 10°F to 25°F(non-adjustable)

Safe momentary undershooVovershoot: ?65°F to +400°F

Electrical action: SPDT(standard), or SPST(specify NO or NC)

Electrical rating: Standard - 28 VDC, 120 VAC, 5 amp resistive, 3 amp inductive, 220 VAC, 5 amp resistive. 50,000 cycles. Gold contacts (for special applications, such as dry circuit or long periods of inactivity) - 28 VDC, 120 VAC,1 amp resistive, 1/2 amp inductive.

Electrical Terminations: Leads are insulated from mounting, 20 AWG stranded, Teflon insulation. AD049 - 3 pins, .035 dia. Special glass seal connections available.

Weight: 0.6 oz to 2.3 oz.

Response time per MIL S 24236 P4.7.5.1: From 15 sees. to 40 sees. (varies with thermal mass of switch body).