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B
Data sheet
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Data sheet
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Schematics
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Specifications
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Ashcroft B Schematics

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235
Nominal Ranges and Deadbands Pressure and Temperature Switches, B-Series
PRESSURE/VACUUM SWITCHES
Overpressure Ratings Approximate Deadband
(1)
Nominal Range
Vacuum
–30 in.Hg –760
Compound
–15 in.H 15 in.H –30 in.H 30 in.H
O/ –375 mmH2O/ –3.7 kPa 20 35 0.15-0.75/ 1.5-2.5/ .45-2.0/ 0.5-1.2/ 2.1-3.5/
2
O 375 mmH2O 3.7 kPa 0.15-0.75 1.5-2.5 0.45-2.0 0.5-1.2 .2.1-3.5
2
O –760 mmH2O/ –7.5 kPa 20 35 0.30-0.60/ 1.5-2.5/ 0.45-2.0/ 0.5-1.5/ 2.1-3.5/
2
O 760 mmH2O 7.5 kPa 0.30-0.60 1.5-2.5 0.45-2.0 0.5-1.5 2.1-3.5
2
–30 in.Hg/ –760 15 psi 1.0 kg/cm
–30 in.Hg/ –760 30 psi 2.0 kg/cm
–30 in.Hg/ –760m 60 psi 4.0 kg/cm
Pressure
10 in.H 30 in.H 60 in.H 100 in.H 150 in.H
15 psi 1.0 kg/cm
O 250 mmH2O 2.5 kPa 20 35 0.2-0.5 1.0-2.0 0.35-1.5 0.4-1.0 1.4-2.8
2
O 750 mmH2O 7.5 kPa 20 35 0.3-0.6 1.5-2.5 4.5-2.0 0.5-2.0 2.1-3.5
2
O 1500m mmH2O 15 kPa 20 35 0.5-1.3 1.5-3.5 0.9-2.5 0.7-3.0 2.1-5.0
2
O 2500 mmH2O 25 kPa 20 35 0.6-1.6 2.5-5.5 1.1-4.0 1.0-4.0 3.5-7.7
2
O 3750 mmH2O 37 kPa 20 35 1.0-2.5 4.5-8.5 1.7-6.5 2.0-6.0 6.0-12.0
2
30 psi 2.5 kg/cm 60 psi 4.0 kg/cm 100 psi 7.0 kg/cm 200 psi 14 kg/cm 400 psi 28 kg/cm 600 psi 42 kg/cm 1000 psi
(8)
3000 psi 210 kg/cm
Proof psi Burst psi 20, 26, 27 21, 24, 31 50 22 32, 42
mmHg –100 kPa 250 400 0.3-0.7 1.5-4.0 0.5-2.2 0.4-1.5 2.1-4.2
mmHg/ –100 kPa 250 400 0.5-1.0/ 2.0-3.5/ 0.75-2.5/ 0.7-1.8/ 2.8-4.2/
2
100 kPa 0.3-0.7 0.5-2.0 0.5-1.0 0.5-1.4 0.7-2.1
mmHg/ –100 kPa 250 400 1.0-1.5/ 3.0-6.0/ 1.2-4.5/ 1.4-2.4/ 4.2-8.4/
2
200 kPa 0.3-0.8 1.0-2.0 0.7-1.5 0.4-1.3 1.4-2.8
mmHg/ –100 kPa 250 400 2.0-3.0 5.0-9.0 2.5-7.0 2.8-4.5/ 7.0-12.0
2
400 kPa 0.7-1.5 3.0-5.0 1.1-4.0 1.0-2.3 4.2-7.0
2
100 kPa 500 1500 0.1-.35 0.5-1.5 0.2-1.0 0.4-1.0 0.7-2.1
2
200 kPa 500 1500 0.1-.50 0.5-1.5 0.3-1.0 0.4-1.0 0.7-2.1
2
400 kPa 500 1500 0.3-1.0 1.0-3.5 0.7-2.5 0.6-2.0 1.4-5.0
2
700 kPa 1000 3000 0.5-1.7 1.5-5.0 1.1-3.5 1.0-4.5 2.1-7.0
2
1400 kPa 1000 3000 1-3 5-13 2-9 3.0-7.5 7.0-18.2
2
2800 kPa 2400 3000 4-7.5 5-24 5.5-15 4.0-11.0 7.0-33.6
2
4200 kPa 2400 3000 4-11 9-30 7-20 5.0-23.0 12.6-42
70 kg/cm2 7000 kPa 12000 18000 7-30 30-110 18-70 15.0-60 42-154
2
21000 kPa 12000 18000 15-60 80-235 37-160 30.0-130.0 112-329
(2)
Switch Element (Buna-N Diaphragm)
DIFFERENTIAL PRESSURE SWITCHES
Overpressure Ratings Approximate Deadband
(1)
Nominal Range
Od 750 mmH2O 7.5 kPa 5.4 21.6 0.3-0.6 1.5-2.5 0.45-2.0 0.5-2.0 2.1-3.5
30 in.H
2
60 in.H
Od 1500 mmH2O 15 kPa 5.4 21.6 0.5-1.3 1.5-3.5 0.9-2.5 0.7-3.0 2.1-5.0
2
100 in.H
Od 2500 mmH2O 25 kPa 5.4 21.6 0.6-1.6 2.5-5.5 1.1-4.0 1.0-4.0 3.5-7.7
2
150 in.H
Od 3750 mmH2O 37 kPa 5.4 21.6 1.0-2.5 4.5-8.5 1.8-6.5 2.0-6.0 6.3-12.0
2
15 psid 1 kg/cm 30 psid 2.5 kg/cm 60 psid 4 kg/cm 100 psid 7 kg/cm 200 psid 14 kg/cm 400 psid 28 kg/cm 600 psid 42 kg/cm
Static psi Proof psi 20, 26, 27 21, 24, 31 50 22 32, 42
2
100 kPa 500 2000 0.5-1.0 2.0-5.0 0.7-3.5 0.7-1.4 2.8-7.0
2
200 kPa 500 2000 1.0-2.0 2.0-5.0 1.5-3.5 1.4-2.8 2.8-7.0
2
400 kPa 500 2000 2.0-4.0 3.0-6.0 3.0-4.5 2.8-5.6 4.2-8.5
2
700 kPa 1000 4000 4.0-10.0 11.0-20.0 7.0-15.0 6.0-14.0 16.0-28.0
2
1400 kPa 1000 4000 5.0-15.0 12.0-40.0 10.0-86.0 7.0-21.0 17.0-56.0
2
2800 kPa 1000 8000 10.0-20.0 20.0-60.0 15.0-40.0 14.0-28.0 28.0-84.0
2
4200 kPa 1000 8000 20.0-40.0 80.0-150.0 30.0-115.0 30.0-56.0 112.0-210.0
(2,4)
Switch Element (Buna-N Diaphragm)
TEMPERATURE RANGE SELECTION
Adjustable Range
Max. Temp.
Approximate Deadband
°F °C °F 20, 26, 27 21, 24, 31 50 22 32, 42
–40 to 60 –40 to16 400 1.0-2.0 3.0-8.0 1.5-5.5 1.4-6.0 8.0-16.0 0 to 100 75 to 205 150 to 260 235 to 375 350 to 525 500 to 750
NOTES:
1. Switches may generally be set between 15% and 100% of nominal range on increasing pressure. Consult fac­tory for applications where setpoints must be lower.
the nominal range column. Deadbands shown are for switches with Buna N diaphragm.
–20 to 40 400 1.5-3.0 5.0-12.0 2.2-8.5 1.5-7.5 9.0-20.0
(7)
(3)
20 to 95 400 1.5-3.5 8.0-16.0 2.5-12.0 2.0-9.0 10.0-24.0 65 to125 400 1.5-3.0 5.0-12.0 2.2-8.5 2.0-9.0 10.0-24.0 110 to 190 500 1.5-3.5 5.0-12.0 2.2-8.5 2.0-9.0 10.0-24.0 175 to 275 700 2.0-4.5 8.0-16.0 3.2-12.0 2.5-10.0 15.0-34.0 260 to 400 900 4.0-8.0 16.0-30.0 7.0-24.0 5.0-23.0 30.0-50.0
Approximate deadbands for optional diaphragms: Viton: Multiply Buna N value by 1.4 Teflon: Multiply Buna N value by 1.2 Stainless Steel: Multiply Buna N value by 1.7 Monel: Multiply Buna N value by 1.7
3. Available with remote mount thermal system only.
(6)
Switch Element
4. Deadbands given are for zero static working pressure.
5. For approximate deadbands for dual switch elements, multiply the single switch element by 1.6.
6. All deadbands given in °F.
7. Not available with 2
8. Proof pressure is 4000 psi with stainless steel and monel welded diaphragms.
3
/4˝ stem.
Consult factory for guidance in product selection Phone (203) 385-0217, Fax (203) 385-0602 or visit our web site at www.ashcroft.com
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