Description, Basic Operation | Murphy SPL instruction

4.5in. (114 mm) Dial Temperature SWICHGAGE®

SPL/45-94117B

Revised 08-05

Catalog Section 10

SPL and 45TE Series

■ Combination Indicating Gage and Critical

Temperature Limit Switches

■ High and Low Temperature Limit Contacts

Are Visible and Adjustable

■ SPDT Snap-Acting Models

*	**	■ Panel and Wall Mount Versions
		■ Panel and Wall Mount Versions

45TE Model

■ Latching Control Relay Versions Available

Description

The 4-1/2 in. (114 mm) dial size SWICHGAGE® is a mechanical gage for temperature indication. It includes adjustable, electrical contacts that can be used for start and stop, to trip alarms and to shut down equipment.

Ranges are available from 15° to 250°F

(9° to 121°C) thru 260° to 450°F (127° to 232°C).

Basic Operation

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-clean- ing motion to ensure electrical continuity.

A toggle switch is provided on SPLC models to override the low contact for equipment start-up.

Models 45TE and 45TEF have internal snap-acting SPDT switches.

Applications

Typical applications include:

•Gas Compressors

•Engine Coolant Temperature

•Process Temperature

•Heaters and Coolers

•Water Pump Temperature

Specifications

Dial: White on black, dual scale, °F and °C stan- dard, 4-1/2 in. (114 mm) diameter.

Case: Die cast aluminum, surface or panel mount.

Capillary: PVC armored copper tube, 5 ft. long (1.5 m.) standard–see options next page.

Sensing Bulb: Copper bulb: 1/2 in. (13 mm) OD; Length: 7 in. (178 mm). Minimum bulb inser- tion–see corresponding chart, on page 2.

Pressure Rating: 600 psi (4.1 MPa) [41 bar].

Connection: 1/2 NPT compression fitting.

Overrange: Do not exceed 10% above full range.

Limit Contacts (SPLC and SPLFC): 1-SPDT, Center off; pilot-duty; 2 A @ 30 V; 1 A @ 125 VAC. Contacts are gold plated silver.

Snap-Acting Switches (45TE and 45TEF):

2-SPDT; 2 A @ 250 VAC.

Dry Relay Contact (“BP” Models):

10 A @ 28 VDC or 10 A @ 120 VAC.

Wire Connections:

Surface mount models: 1/2 NPT conduit and terminal block.

Panel mount models: Wire leads, 18 AWG (1.0 mm2) x 9 in. (229 mm) long.

“OS” models: 1/2 NPT conduit and wire leads, 18 AWG (1.0 mm2) x 9 in. (229 mm) long.

Item Weight: 8 lb. (3.6 kg) approximately. Explosion-proof models: 22 lb. (10 kg) approx.

Item Dimensions: 16 x 11 x 5-1/2 in. (406 x 279 x 140 mm).

Explosion-proof models: 12 x 12 x 9 in. (305 x 305 x 229 mm).

Basic Models

SPLC Series SWICHGAGE®

Surface mount version of the SWICHGAGE®. For these models the gage pointer makes with two adjustable contacts to complete a pilot duty circuit.

SPLFC Series SWICHGAGE® Panel-mounting (round case) version of the SPLC.

SPLBP Latching Control Relay

SWICHGAGE®

This version of the SPLC Series is designed to start and to stop electric motor driven equipment. The pilot duty contacts of the SPLBP are connected to a latching control relay for automatic ON/ OFF con- trol, either directly or through a motor starter.

45TE Series Snap-Acting SWICHGAGE® Surface mount version of the SWICHGAGE®. These models offer internal snap-acting SPDT switches, instead of the single pole contacts.

45TEF Series SWICHGAGE®

This is the panel mounting (round case) version of the 45TE series.

45TEBP Snap-Acting and Latching Control Relay SWICHGAGE®

Same as 45TE–includes an internal latching con- trol relay for automatic ON/OFF control either directly or through a motor starter.

Murphy offers square case configurations altered to fit round panel openings, see “Dimensions”, next page.

*Selected configurations are third party listed. Call Murphy for details.

**Products covered by this bulletin comply with

EMC Council directive 89/336/EEC regarding electromagnetic compatibility except as noted.

SPL/45-94117B page 1 of 4

SPL specifications

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