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

2 and 2-1/2 in. (51 and 64 mm) Dial
A20 and A25 Series
Temperature SWICHGAGE ®
A20T Series
shown
The A20 Series (2 inch/51 mm dial) and the A25
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).
All models of these rugged, built-to-last instruments
are fully sealed from the environment by the unique
combination of a polycarbonate case and lens, a polished stainless steel bezel, and O-ring seals.
These vapor/pressure 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 a diaphragm mechanism.
The diaphragm translates this vapor pressure into a
mechanical gage reading.
For series A20T and A25T, 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 isolated from ground. They have
self-cleaning motion to enhance electrical continuity.
Models A20TE and A25TE have internal snap-acting
SPDT switches.
Gage-only models, without contacts
(MURPHYGAGE®) are also available.
Applications
Applications for A20 and A25 Series temperature
SWICHGAGE® instruments include: engines and
equipment in Oil Field, Marine, Irrigation, Construction
and Trucking industries. Monitoring Engine Coolant
temperature, Crankcase Oil, Transmission Oil.
Specifications
Dial: White on black; U.S.A. standard scale is dual
scale °F/°C; others available.
(00-02-0039)
2 and 2-1/2 in. (51 and 64 mm) Dial
**
Description
AT-95026B
Revised 07-04
Catalog Section 10
Corrosion Resistant Polycarbonate Case
Indicating Gage and Limit Switch
Switch Can Activate Alarms and/or Shut
Down Equipment
Critical/High Temperature Limit Switch
Is Visible and Adjustable (Most Models)
Contact(s) Isolated From Ground
Case: Glass filled/Polycarbonate, corrosion-resistant; steel mounting clamp included. Bezel:
Polished stainless steel, standard; others
are available.
Pointer: Tempered nickel silver; red tip.
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 (A20T and A25T):
SPST contact; pilot-duty only, 2 A @ 30 VAC/
VDC; isolated from case ground. Normally Closed
when the high limit is met. Normally Open 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.
Wiring: A20T: Number 4 screw terminals;
A25T: Number 6 screw terminals.
Snap-Switch Rating (A20TE and A25TE):
SPDT, 3 [email protected] 30 VDC inductive; 4 A @
125 VAC inductive.
Wiring: A20TE: Number 4 screw terminals;
A25TE: Number 6 screw terminals.
Unit Weight: A20 Series: 11.9 oz. (0.370 kg).
A25 Series Models: 13.3 oz. (0.413 kg).
Unit Dimensions: A20 Series: 4-3/4 x 4-3/4 x 3 in.
(121 x 121 x 76 mm). A25 Series Models: 4-3/4 x
4-3/4 x 2-3/4 in. (121 x 121 x 70 mm).
Base Models
Coolant or Oil Temperature
A20T and A25T Series SWICHGAGE®
For these models the gage pointer makes with an
adjustable contact to complete a pilot-duty circuit.
Bulletin AT-95026B page 1 of 4
A20TL and A25TL SWICHGAGE®
For use on Ford Worldwide engines. Supplied with
special sensing bulb.
A20TE and A25TE SWICHGAGE®
A20TE (was A20ESR) and A25TE (was A25ESR).
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.
Model A25TE is CSA listed for
non-hazardous areas. Model
A25TE-EX is CSA listed for
Class I, Division 1, Groups
C & D hazardous areas.
A20TABS and A25TABS SWICHGAGE®
Same as 20 and 25T with internal SPDT snapswitch for pre-alarm.
Cylinder Head Temperature
A20TH and A25TH SWICHGAGE®
A20TH (was A20TL8133) and A25TH (was
A25TL8133). For use on Air Cooled engines.
Gage–Only Models
A20TG and A25TG MURPHYGAGE®
Gage without contact(s).
* For optional capillary lengths, engine adapters, sensing bulbs
and range combinations, see Murphy bulletin T-8428B.
** Products covered by this bulletin comply with EMC Council
directive 89/336/EEC regarding electromagnetic
compatibility except as noted.
Dimensions
A20 Seri es Model s (typi c al )
2-1/4 in.
(57 mm)
M
U
RP
HY
SWI CH
°F
GA
G
E
160 210 230
130
80 100 1
20
60
°C
TEMPERATURE
A25 Seri es Model s (typi c al )
2-1/2 in.
(64 mm)
2-29/32 in.
(74 mm)
®
M
25
0
Mounting
Clamp
U
RP
HY
S WI CHG
°F
2-1/2 in.
(64 mm)
AG
E
®
160 210 230
130
25
80 100 1
20
°C
TEMPERATURE
60
Capillary†
1-27/64 in.
(36 mm)
2-1/16 in. (53 mm)
Mounting hole dia.
1-1/2 in.
(38 mm)
1/2 NPT
Adapter Nut†
Mounting
Clamp
4 ft. (1.2 m)
long
Contact
Adjustment
1/16 in. hex
0
Capillary†
1-11/32 in.
(34 mm)
2-11/16 in. (68 mm)
Mounting hole dia.
5/8-18 U.N.F.
Sensing Bulb†
Contact
Adjustment
Union Nut
4 ft. (1.2 m)
long
1/16 in. hex
1/2 NPT
Adapter Nut†
†Standard combinations. See Murphy bulletin T-8428B for optional sensing bulb, engine adaptors and capillary combinations.
1-1/2 in.
(38 mm)
Sensing Bulb†
5/8-18 U.N.F.
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 A20TE and A25TE; 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)
––
0 – 70
45 – 100
50 – 120
60 – 140
70 – 160
––
––
Std. Settings*
Max. Temp.
°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 (173)
370 (192)
400 (209)
500 (260)
* Standard setting for A20T, A25T, A20TE and A25TE 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 AT-95026B 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 pilot-duty SWICHGAGE® limit contacts.
HIGH
C
S
C
A20T Temperature
®
SWICHGAGE
A20P Pressure
®
SWICHGAGE
117 Magnetic Switch
A20T Temperature
®
SWICHGAGE
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.
LOW
B
C
N. C.
N. O.
N.O. SWICHGAGE
instruments
R
HIGH
G
®
C
NC
SW1 SW2
_
+
+
Battery
Energized To Run Devices
Battery
B
N. O.
Energized To Run Devices
_
518PH TATTLETALE®
N.C. switches option
Pre-Alarm Using A20/A25TABS
The A20TABS and A25TABS features a standard limit contact for equipment
shutdown on high temperature. It also has an internal SPDT snap-switch to signal an alarm before shutting down. When 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
Alarm Before
Shutdown
®
MINI-SIREN
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®
A20TABS
®
SWICHGAGE
R
G
ABS
NC
B
SW1 SW2
HIGH
N. C.
N. O.
C
Shutdown Device
or Ignition Circuit
_
Opens circuit to
shutdown engine.
Typical Internal Wiring Diagrams
Pointer shown in the shelf position. Pointer type contact rating: pilot-duty 2 A @ 30 VAC/VDC resistive.
Snap-acting switch rating: 3 A @ 30 VDC inductive. 4 A @ 125 VAC inductive.
A20T
A20T-HL
LOW
HIGH
C
N. C.
A25T
N. C.
C
N. O.
N. O.
HIGH
N. C.
C
C
N. O.
N. C.
N. C.
N. O.
C
N. O.
RESET
HIGH
L
P
H
LOW
SET
HIGH
L
P
H
A20TE
ABS
A25TABS
A25T-HL
N. C.
A20TABS
HIGH
L
P
RESET
HIGH
C
N. O.
A25TABS-HL
N. C.
C
N. O.
RESET
SET
LOW
HIGH
H
Bulletin AT-95026B page 3 of 4
SET
L
P
H
N. O.
C
N. C.
A25TE
N. C.
C
RESET
N. O.
SET
L
P
H
+
Battery
How to Order
To order, use the diagram below. List options in ascending alphabetical order (A-Z). Example: A20T-B1-250-4.
____ – ____ – ____ – ____ – ____
Base Model
Options
†
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
B1 = Black bezel
EX = Explosion-proof (CSA Listed for
Class I, Div. 1, Groups C & D) *
EL = Explosion-proof less case
HL = High and low contacts
K = Knob adjusting face contact
OS = Oil sealed (Silicone Oil)
UA = Temperature bulb style “A” (10-05-0166)
UB = Temperature bulb style “B” (10-01-0061)
UC = Temperature bulb style “C” (10-01-0060)
UD = Temperature bulb style “D” (10-00-0286)
UE = Temperature bulb style “E” (10-01-0084)
UF = Temperature bulb style “F” (10-00-0577)
UG = Temperature bulb style “G” (10-00-0578)
UH = Temperature bulb style “H” (10-00-2466)
UJ = Temperature bulb style J (10051153)
UK = Temperature bulb style K (10054886)
††† Specific adapter nut must
match the sensing bulb.
†††† Standard.
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 m.
increments from 1.5–10 m.; 2 m. increments thru
34 m. Specify “M” following length, i.e. 1.5M. )
Range
Illumination – Order Separately
Clamp Lite Assembly; 12 V= 05702176; 24 V= 05702177
N/A.
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
Temperature Capillary Armor Type
and Length
†Options not available on all models or configurations.
*A25TE-EX only is CSA listed for hazardous locations.
**This option is not covered by the CE mark.
A20 Series:
A25 Series:
Metric
M10 =
M12 =
M14 =
M16 =
M18 =
M20 =
M22 =
M24 =
††
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
°C
0-49
0-71
54-104
60-121
60-149
71-160
82-177
149-227
Single scale (°C)
70C = 0-70°C
100C = 45-100°C
120C = 50-120°C
140C = 60-140°C
160C = 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
A20TG
A25T
A25TL
A25TE
A25TABS
A25TH
A25TG
†††
ST ER
E
A20T
A20TL
A20TO
A20TE
A20TABS
A20TB
A20TH
Adapter Nuts
USA–ISO 9001:2000 FM 28221
UK–ISO 9001:2000 FM 29422
Bulletin AT-95026B page 4 of 4
Printed in U.S.A.
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