Bulletin AT-95026B page 2 of 4
2-1/4 in.
(57 mm)
2-1/2 in.
(64 mm)
2-29/32 in.
(74 mm)
2-1/2 in.
(64 mm)
1-11/32 in.
(34 mm)
2-11/16 in. (68 mm)
Mounting hole dia.
1-27/64 in.
(36 mm)
2-1/16 in. (53 mm)
Mounting hole dia.
Mounting
Clamp
Mounting
Clamp
°C
TEMPERATURE
1-1/2 in.
(38 mm)
1/2 NPT
M
U
RP
H Y
S W I C H G
A G
E
®
Contact
Adjustment
1/16 in. hex
°C
TEMPERATURE
130
160 210
250
80 100
60
230
120
M
U
RP
H Y
S W I C H G
A G
E
®
°F
Contact
Adjustment
1/16 in. hex
Adapter Nut
†
Union Nut
Sensing Bulb
†
Union Nut
130
160 210
250
80 100
60
230
120
°F
1-1/2 in.
(38 mm)
1/2 NPT
5/8-18 U.N.F.
Adapter Nut
†
Sensing Bulb
†
5/8-18 U.N.F.
4 ft. (1.2 m)
long
Capillary
†
4 ft. (1.2 m)
long
Capillary
†
†
Standard combinations. See Murphy bulletin T-8428B for optional sensing bulb, engine adaptors and capillary combinations.
Dimensions
A20 Series Models (typical)
A25 Series Models (typical)
Ranges Available
Dual Scale Dial
Single Scale
°Fahrenheit (°Celsius)
°Celsius only
Std. Settings
*
°F (°C)
°C
only
Max. Temp.
°F (°C)
20TABS and 25TABS Settings
Alarm
**
Shutdown
°F (°C) °C
only
°F (°C)
°C
only
Hi/Lo Settings
Low
High
°F (°C)
°F (°C)
32 – 160
(0 – 71)
0 – 70
215 (102)
150 (66)
66
32 (0)
150 (66)
140 (60)
60
150 (66)
66
32 – 120
(0 – 49)
––
185 (85)
110 (43)
––
32 (0)
110 (43)
100 (38)
––
110 (43)
––
130 – 220
(54 – 104)
45 – 100
260 (127)
210 (99)
85
160 (71)
210 (99)
200 (93)
80
210 (99)
85
130 – 250
(54 – 121)
50 – 120
310 (154)
210 (99)
97
160 (71)
210 (99)
200 (93)
95
210 (99)
100
160 – 320
(71 – 160)
70 – 160
370 (192)
300 (149)
150
200 (93)
300 (149)
290 (143)
145
300 (149)
150
140 – 300
(60 – 149)
60 – 140
340 (173)
275 (135)
130
200 (93)
275 (135)
265 (129)
125
275 (135)
130
180 – 350
(82 – 177)
––
400 (209)
330 (166)
––
240 (116)
330 (166)
320 (160)
––
330 (166)
––
300 – 440
(149 – 227)
––
500 (260)
400 (204)
––
300 (149)
400 (204)
390 (199)
––
400 (204)
––
*
Standard setting for A20T, A25T, A20TE and A25TE models.
**
SPDT snap-switch is the alarm switch.
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 differen-
tial.
3.
For adjustable switch models, the trip point is adjustable
only
over the upper half of the scale.
Temperature Ranges and Factory Settings
Temperature Accuracy Chart
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)
Temperature Range
Lower
1
/
3
of Scale
Middle
1
/
3
of Scale
Upper
1
/
3
of Scale
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)
± 5°F (± 2.4°C)
± 4°F (± 2°C)
RANGE
MAXIMUM PROCESS
TEMPERATURE
≤
250° (120°)
120% OF FULL SCALE
300° (140°)
350° (198°)
≥
320° (160°)
120% OF FULL SCALE
MAXIMUM AMBIENT
TEMPERATURE:
-40° (-40°) thru 150° (66°)
Maximum Temperature
