2 and 2-1/2 in. (51 and 64 mm) Dial

2 and 2-1/2 in. (51 and 64 mm) Dial
20 and 25 Series
Temperature SWICHGAGE ®
20T Series
shown
Description
The 20 Series (2 inch/51 mm dial) and the 25 Series
(2-1/2 inch/64 mm dial) SWICHGAGE® models are
diaphragm-actuated, temperature-indicating gages,
with built-in electrical switches for tripping alarms
and/or shutdown devices.
Ranges are available from 32-120°F (0-45°C) thru
300-440°F (160-220°C).
The gage mechanism is enclosed in a steel case
coated to resist corrosion. A polycarbonate, breakresistant lens and a polished, stainless steel bezel
help protect this rugged, built-to-last instrument.
These vapor actuated gages feature a sealed capillary tube and a sensing bulb. When subjected to
heat, the liquid in the sensing bulb changes to vapor
creating pressure against the diaphragm mechanism.
The diaphragm translates this vapor pressure into a
mechanical gage reading.
For series 20T and 25T, the gage pointer acts as a
temperature indicator and as one switch pole which
completes a circuit when it touches the adjustable
limit contact. Contact(s) are grounded through the
SWICHGAGE® case. They have self-cleaning
motion to enhance electrical continuity.
Models 20TE and 25TE have internal snap-acting
SPDT switches.
Gage-only models, without contacts
(MURPHYGAGE®) are also available.
Applications
Industrial engines and equipment in Oil Field,
Marine, Irrigation Construction and Trucking
, Engine Coolant, Crankcase
industries. Monitoring
Oil, Transmission Oil.
Specifications
Dial: White on black; U.S.A. standard scale is dual
scale °F/°C; others available (see How to Order).
Case: Plated steel; mounting clamp included
(except for direct mounting models).
T-94031B
Revised 08-03
Catalog Section 10
(00-02-0048)
2 and 2-1/2 in. (51 and 64 mm) Dial
Combination Indicating Gage and Limit Switch
Critical/High Temperature Limit Switch Is
Visible and Adjustable (Most Models)
Switch Can Activate Alarms and/or
Shut Down Equipment
**
Contact Grounds Through Case
Bezel: Polished stainless steel, standard; others are
available (see How to Order).
Pointer: Tempered nickel silver.
Lens: Polycarbonate, high-impact.
Sensing Element: Beryllium copper diaphragm.
Capillary: PVC armored copper; 4 ft. (1.2 m).*
Galvanized and stainless steel armor optional.
Sensing Bulb: Copper.*
Gage Accuracy: See accuracy chart, on page 2.
Maximum Temperature: See Temperature Ranges
and Factory Settings table on page 2.
Adjustable Limit Contact (20T and 25T):
SPST contact; pilot duty only, 2 A @
30 VAC/ VDC; Ground path through encasement.
Normally Closed (NC) when the high limit is met.
Normally Open (NO) when pointer is in normal operating range. Contacts are gold flashed silver.
Limit Contact Adjustment: by a 1/16 in. hex
wrench thru 100% of the scale.
Limit Contact Wire Leads: 18 AWG (1.0 mm2) x
12 in. (305 mm).
Snap-Switch Rating (20TE and 25TE):
SPDT, 3 A @ 30 VDC inductive; 4 A @
125 VAC inductive.
Snap-Switch Wire Leads: 20 AWG (0.75 mm2) x
12 in. (305 mm).
Unit Weight: 20 Series: 12.7 oz. (0.39 kg).
25 Series Models: 13.8 oz. (0.43 kg).
Unit Dimensions: 20 Series: 4-3/4 x 4-3/4 x 2-3/4 in.
(121 x 121 x 70 mm). 25 Series Models: 4-3/4 x
4-3/4 x 3 in. (121 x 121 x 76 mm).
20TL and 25TL SWICHGAGE®
For use on Ford Worldwide engines. Supplied with
special sensing bulb.
Base Models
Gage–Only Models
Coolant or Oil Temperature
20T and 25T Series SWICHGAGE®
For these models the gage pointer makes with an
adjustable contact to complete a pilot-duty circuit.
Bulletin T-94031B page 1 of 4
20TO SWICHGAGE®
Same as 20T with a special dial for Oil Temperature.
20TE and 25TE SWICHGAGE®
20TE (was 20ESR) and 25TE (was 25ESR).
Models with internal SPDT snap-switches, instead
of the single pole/pointer contact(s). When the
switch closes on rising temperature, it becomes Set.
As temperature decreases the switch Resets.
20TABS and 25TABS SWICHGAGE®
Same as 20/25T with internal SPDT snap-switch for
pre-alarm.
Bearing Temperature
20TB SWICHGAGE®
Features special sensing bulb for saddle
bearing temperature.
Cylinder Head Temperature
®
20TH and 25TH SWICHGAGE
20TH (was 20TL8133) and 25TH (was 25TL8133).
For use on Air Cooled engines.
Direct Mount Models
20TD SWICHGAGE®
Same as 20T. Available ranges: 220°F (104°C ) or
250°F (121°C). Includes 1/4 x 4 in. (6 x 102 mm)
sensing bulb.
20SD SWICHGAGE®
Same as 20T. Available ranges: 220°F (104°C ) or
250°F (121°C). Includes 11/32 x 1-1/2 in. (9 x
38 mm) sensing bulb.
®
20TG and 25TG MURPHYGAGE
Gages without contact(s).
* For optional capillary lengths, engine adaptors, sensing bulbs
and range combinations, see Murphy bulletin T-8428B.
** Products cover by this bulletin comply with EMC Council
directive 89/336/EEC regarding electromagnetic compatibility
as noted.
Dimensions
20 Seri es Model s (typi c al )
2-15/64 in. (57 mm)
M
U
RP
HY
SWI CH
°F
GA
G
E
160 210 230
130
80 100 1
20
60
°C
TEMPERATURE
25 Seri es Model s (typi c al )
2-9/32 in. (58 mm)
3-1/8 in. (79 mm)
®
M
25
0
Mounting
Clamp
1-1/2 in.
(38 mm)
1/2 NPT
Adapter Nut†
S WI CHG
°F
AG
E
®
80 100 1
20
°C
TEMPERATURE
0
Mounting
Clamp
Wire
Lead
4 ft. (1.2 m)
long
Contact
Adjustment
1/16 in. hex
HY
60
Capillary†
1-5/16 in.
(33 mm)
RP
160 210 230
130
25
Wire
Lead
2-1/16 in. (52 mm)
Mounting hole dia.
U
2-9/32 in. (58 mm)
5/8-18 U.N.F.
Sensing Bulb†
Contact
Adjustment
Union Nut
Capillary†
1-3/8 in.
(35 mm)
2-11/16 in. (68 mm)
Mounting hole dia.
1/16 in. hex
1-1/2 in.
(38 mm)
1/2 NPT
Adapter Nut†
†Standard combinations. See Murphy bulletin T-8428B for optional sensing bulb, engine adaptors and capillary combinations.
4 ft. (1.2 m)
long
5/8-18 U.N.F.
Sensing Bulb†
Union Nut
Temperature Ranges and Factory Settings
NOTES
1. Values in ( ) are mathematical conversions from °F to °C–they do not reflect actual second scale range. U.S.A. standard scale is °F/°C.
2. For models 20TE and 25TE; the switch trip point cannot be set at either the low or high extreme of the scale. The trip point must allow for the reset differential.
3. For adjustable switch models, the trip point is adjustable only over the upper half of the scale.
Ranges Available
Dual Scale Dial
Single Scale
°Fahrenheit (°Celsius)
°Celsius only
32 – 120
32 – 160
130 – 220
130 – 250
140 – 300
160 – 320
180 – 350
300 – 440
(0 – 49)
(0 – 71)
(54 – 104)
(54 – 121)
(60 – 149)
(71 – 160)
(82 – 177)
(149 – 227)
Std. Settings*
Max. Temp.
––
0 – 70
45 – 100
50 – 120
60 – 140
70 – 160
––
––
°F (°C)
185 (85)
°F (°C)
°C only
150 (66)
210 (99)
210 (99)
275 (135)
300 (149)
330 (166)
400 (204)
66
85
97
130
150
––
––
110 (43)
215 (102)
260 (127)
310 (154)
340 (172)
370 (192)
400 (209)
500 (260)
* Standard setting for 20T, 25T, 20TE and 25TE models.
** SPDT snap-switch is the alarm switch.
––
20TABS and 25TABS Settings
Hi/Lo Settings
Low
Alarm**
High
°F (°C)
°F (°C)
32 (0)
160 (71)
160 (71)
200 (93)
200 (93)
240 (116)
300 (149)
150 (66)
210 (99)
210 (99)
275 (135)
300 (149)
330 (166)
400 (204)
32 (0)
110 (43)
Shutdown
°F (°C)
°C only
°F (°C)
°C only
140 (60)
200 (93)
200 (93)
265 (129)
290 (143)
320 (160)
390 (199)
60
80
95
125
145
––
––
150 (66)
210 (99)
210 (99)
275 (135)
300 (149)
330 (166)
400 (204)
66
85
100
130
150
––
––
100 (38)
––
110 (43)
Temperature Accuracy Chart
Temperature Range
Lower 1/3 of Scale
Middle 1/3 of Scale
Upper 1/3 of Scale
32 to 120°F (0 to 49°C)
± 12°F (± 6°C)
± 5°F (± 2.4°C)
± 6°F (± 3°C)
32 to 160°F (0 to 71°C)
± 20°F (± 10°C)
± 8°F (± 4.4°C)
± 7°F (± 4°C)
130 to 220°F (54 to 104°C)
± 6°F (± 3°C)
± 3°F (± 1.6°C)
± 4°F (± 2°C)
130 to 250°F (54 to 121°C)
± 9°F (± 5°C)
± 5°F (± 2.4°C)
± 4°F (± 2°C)
140 to 300°F (60 to 149°C)
± 10°F (± 5.2°C)
± 6°F (± 3°C)
± 5°F (± 2.4°C)
160 to 320°F (71 to 160°C)
± 10°F (± 5.2°C)
± 5°F (± 2.4°C)
± 5°F (± 2.4°C)
180 to 350°F (82 to 177°C)
± 12°F (± 6°C)
± 5°F (± 2.4°C)
± 5°F (± 2.4°C)
300 to 440°F (149 to 227°C)
± 9°F (± 5°C)
Maximum Temperature
± 5°F (± 2.4°C)
RANGE
MAXIMUM AMBIENT
TEMPERATURE: -40° (-40°) thru 150° (66°)
≤250° (120°)
300° ( 140° )
≥320° (160°)
Bulletin T-94031B page 2 of 4
± 4°F (± 2°C)
MAXIMUM PROCESS
TEMPERATURE
120% OF FULL SCALE
350° ( 198° )
120% OF FULL SCALE
––
Magnetic Switch
INDUCTIVE AND HIGH CURRENT LOADS REQUIRE THE USE OF A
MAGNETIC SWITCH. The SWICHGAGE® contacts are for light-duty electrical switching to operate alarms or control devices. Murphy manufactures the
Magnetic Switch for protection of the light-duty SWICHGAGE® limit contacts.
20T Temperature
SWICHGAGE®
M
130
U
RP
HY
160
SWI CHG
°F
210 230
AG
80 100 1
20
°C
TEMPERATURE
60
E
TATTLETALE® Magnetic Switches show the cause of shutdown for applications that include: capacitor discharge or magneto ignitions, battery systems and
electric motor driven equipment. Typical wiring diagrams are shown below.
117 Magnetic Switch
UR
M
®
25
0
0
C
S
W
20P-F Pressure
®
SWICHGAGE
B
20
0
YS
PH
ICHG
A
PSI
40 60
GE
80
300 60
0
kPa
PRESSURE
20T-F Temperature
SWICHGAGE®
®
M
10
PH
UR
Y SWICHGA
GE
®
°F
0 210 230
0 16
13
0
60
80 100 12
°C
518PH Magnetic Switch
25
R
0
G
0
NC
SW1 SW2
B
TEMPERATURE
N.O. SWICHGAGE®
instruments
_
+
Battery
Energized To Run Devices
Energized To Run Devices
N.C. switches option
_
+
Battery
Pre-Alarm Using 20/25TABS
The 20TABS and 25TABS feature a standard limit contact for high temperature
equipment shutdown. It also has an internal SPDT snap-switch to signal an
alarm before shutting down. When the low side of the snap-switch trips (preset
point), on rising temperature, the switch completes a circuit to activate an alarm.
If the temperature continues to increase, the face-adjustable pointer contact will
make and the shutdown circuit will be completed (see the typical diagram below
for reference). The front contact shutdown limit setting (which is adjustable)
and the snap-switch are preset at the factory. Refer to “Temperature Ranges and
Factory Settings” table on opposite page for settings. For alternative alarm
before shutdown, see Magnetic Switch model 760A or 761APH.
518PH
TATTLETALE®
Magnetic Switch
20TABS
SWICHGAGE®
Alarm Before
Shutdown
®
Mini-Siren
R
G
Shutdown Device
or Ignition Circuit
NC
SW1 SW2
B
_
Opens circuit to
shutdown engine.
+
Battery
Typical Internal Wiring Diagrams
Pointer shown in the shelf position. Pointer type contact rating: pilot duty 2 A @ 30 VAC/VDC.
Snap-acting switch rating: 3 A @ 30 VDC inductive. 4 A @ 125 VAC inductive.
Pointer Type
Contact
“HL” Hi-Lo
Option
HIGH
Case
ground
BLACK
LOW
RED
ABS
Models
HIGH
Case
ground
TE
Models
N.C. (RED)
N.C. (RED)
COM. (WHITE)
COM. (WHITE)
N.O. (BLACK)
N.O. (BLACK)
HIGH
BLACK
Case Ground
Bulletin T-94031B page 3 of 4
BLACK
Case Ground
How to Order
To order, use the diagram below. List options in ascending alphabetical order (A-Z). Example: 20T-IP1-250-4.
____ – ____ – ____ – ____– ____
Base Model
Adapter Nuts†††
25TL
25TE
25TABS
25TH
25TG
1/8 = 1/8-27 NPT
1/4 = 1/4-18 NPT
3/8 = 3/8-18 NPT
3/8B = 3/8-19 BSPT
3/8K = 3/8 NPSF
††††
–
= 1/2-14 NPT
1/2B = 1/2-BSPT
1/2K = 1/2 NPSF
5/8 = 5/8-18 UNF
3/4 = 3/4-14 NPT
3/4U = 3/4-16 UNF
7/8 = 7/8-9 UNC
Options†
A = AGF (Argon filled)
B1 = Black bezel
B2 = Bezel 05051857 (was “HP”)
B3 = Bezel 05051836 (was “HBB”)
EX = EX proof (explosion proofed)
EL = EX less case (explosion proofed less case)
F = “FS” contact (includes “ES” as appropriate)
HL = High and low contacts
I = Illumination (for options, see chart below)
IP1 = Light pipe illumination, 12 VDC
IP2 = Light pipe illumination, 24 VDC
K = Knob adjusting face contact
OS = Oil sealed (Silicone Oil)
*
UA = Temperature bulb style A (10050166)
*
UB = Temperature bulb style B (10010061)
*
UC = Temperature bulb style C (10010060)
*
UD = Temperature bulb style D (10000286)
*
UE = Temperature bulb style E (10010084)
*
UF = Temperature bulb style F (10000577)
*
UG = Temperature bulb style G (10000578)
*
UH = Temperature bulb style H (10002466)
*
UK = Temperature bulb style K (10054886)
† Options not available on all models or configurations.
* Specify optional bulb ONLYwhen not included as standard for
temperatureBase Model, scale/range or capillary length.
Illumination Options
20 Series
25 Series
IP1 / IP2
x
N/A
1
Can be used with standard Clamp Lite Assembly
(12 V= 05702176; 24 V= 05702177).
2
Order Lamp and Socket Assembly separately
(12 V= 05010198; 24 V= 05010199).
I
x1
x2
Metric
M10 =
M12 =
M14 =
M16 =
M18 =
M20 =
M22 =
M24 =
10 mm x 1.5
12 mm x 1.5
14 mm x 1.5
16 mm x 1.5
18 mm x 1.5
20 mm x 1.5
22 mm x 1.5
24 mm x 1.5
†††Specific adapter nut must
match the sensing bulb.
††††Standard.
Temperature Capillary Armor Type and Length
Capillary Armor Type
Blank = PVC armor, copper capillary
S = Stainless steel armor, copper capillary
Capillary Length (specify after capillary type; example: “S4”)
4 = 4 ft. (1.2 m)
Specify other length =Available in 2 ft. increments thru 20 ft.;
5 ft. increments above 20 ft. (0.5 metres increments from 1.5–10
metres; 2 metre increments thru 34 metres.Specify “M” following length, i.e. 1.5M. )
Range††
Dual scale (°F/°C)
°F
120 = 32-120
160 = 32-160
220 = 130-220
250 = 130-250
300 = 140-300
320 = 160-320
350 = 180-350
440 = 300-440
Single scale (°C)
°C
0-49
0-71
54-104
60-121
60-149
71-160
82-177
149-227
70C
100C
120C
140C
160C
=
=
=
=
=
0-70°C
45-100°C
50-120°C
60-140°C
70-160°C
††Consult factory for availability of dials other than °F/°C. Select scale
so your normal operating temperature is in the upper half of the scale.
Warranty
A limited warranty on materials and workmanship is given with
this FW Murphy product. A copy of the warranty may be viewed
or printed by going to www.fwmurphy.com/support/warranty.htm
RE
GI
D
20TH
20TD
20SD
20TG
25T
ST ER
E
20T
20TL
20TO
20TE
20TABS
20TB
USA–ISO 9001:2000 FM 28221
UK–ISO 9001:2000 FM 29422
Bulletin T-94031B page 4 of 4
Printed in U.S.A.
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