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Custom Control Panels ► SPL Series
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The 4-1/2 in. (114 mm) size dial gauge is a mechanical gauge for temperature indication. It is a combination indicating gauge and critical temperature limit switch. High and low temperature limit contacts are visible.
The SPL Series includes adjustable, electrical contacts that can be used for start and stop, to trip alarms and to shut down equipment.
Panel and wall-mount versions are available as well as latching control relay versions.
Ranges are available from 15° to 250° F (9° to 121° C) through 130° to 350° F (54° to 177° C).
Basic Models
SPLC Series gauge: Surface-mount version of the gauge. For this model, the gauge pointer makes with two adjustable contacts to complete a pilot-duty circuit.
SPLFC Series gauge: Panel-mounting (round case) version of the SPLC
FW Murphy offers square case configurations altered to fit round panel openings, see Dimensions.
Basic Operation
This vapor-actuated gauge 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 gauge reading.
For models SPLC and SPLFC, the gauge 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.
