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SPL/45-94117B page 1 of 4

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 mm

2

) x 9 in. (229 mm) long.

“OS” models

: 1/2 NPT conduit and wire leads, 

18 AWG (1.0 mm

2

) 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.

SPL/45-94117B

Revised 08-05

Catalog Section 10

4.5 in. (114 mm) Dial 
Temperature SWICHGAGE

®

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

Latching Control Relay Versions Available

45TE Model

**

**

Products covered by this bulletin comply with 
EMC Council directive 89/336/EEC regarding 

electromagnetic compatibility except as noted. 

*

*

Selected configurations are third party listed.

Call Murphy for details.

Summary of Contents for Temperature SWICHGAGE SPL

Page 1: ...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 ...

Page 2: ...o 121 C 8 F 4 C 2 F 1 C 2 F 1 C 5 in 127 mm 130 to 350 F 60 to 180 C 8 F 4 C 2 F 1 C 3 F 1 5 C 2 1 2 in 64 mm 260 to 450 F 127 to 232 C 8 F 4 C 2 F 1 C 3 F 1 5 C 2 1 2 in 64 mm Minimum Sensing Bulb Insertion into Process Using a Thermowell Start Up Lockout Start Up Lockout Toggle Switch SPLC Series Low Limit Contact TEMPERATURE MURPHY SWICHGAGE TULSA U S A 270 250 220 200 170 350 340 320 300 290 C...

Page 3: ...E model The 45TE series SWICHGAGE incorporates 2 SPDT snap switches instead of the pointer type contacts of the SPL Unlike the SPL that completes an elec trical circuit as soon as the pointer touches the contact the 45TE trip point indi cators will stop the pointer movement slightly before the switches operate As temperature continues to increase reaching high set point or to decrease reaching low...

Page 4: ... NOTE No designator is required for Standard configurations Also list options in alphabetical order A to Z Place a dash between each option See example below SPLBP 4 350 G 10 EX How to Order Latching Control Relay Voltage applies to BP models only Blank 120 VAC 2 12 VDC 4 24 VDC This version not covered by CE mark Warranty A limited warranty on materials and workmanship is given with this FW Murph...

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