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| SPL Series 4.5" Surface Mount Temperature Swichgage®
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The SPL Series Swichgage® instruments are combination indicating gage and critical temperature limit switches. Each model includes adjustable, electrical contacts that can be used for start and stop, to trip alarms and to shut down equipment. High and low temperature limit contacts are visible and adjustable. Typical applications include gas compressors, heaters and coolers, water pump temperature, engine coolant temperature, and process temperature.
This vapor-actuated gage features a sealed capillary tube and sensing bulb. When subjected to heat, the liquid in the sensing bulb expands to vapor creating pressure against a bourdon tube mechanism. The bourdon tube translates this vapor pressure into a mechanical gage reading.
For models SPLC and SPLFC, the gage pointer acts as a pressure indicator and as one switch pole, which completes a circuit when it touches the adjustable limit contacts. Contacts have self-cleaning motion to ensure electrical continuity. A toggle switch is provided on SPLC models to override the low contact for equipment start-up.
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