Submittal Sheet

B-Series Switches – Pressure, Differential Pressure,
Temperature & Hydraulic
BULLETIN SW10
Ashcroft Inc., 250 East Main Street, Stratford, CT 06614 USA
Tel: [phone] • Fax: [phone]
email: [e-mail] • www.ashcroft.com
All specifications are subject to change without notice.
All sales subject to standard terms and conditions.
© Ashcroft Inc. 2007 10/08
Pressure & Differential Pressure Switches
B-Series pressure, differential pressure and
vacuum switches use two different actuators
depending on setpoint require-ments. For set-
points between 2 and 3000 psi, the simple,
rugged diaphragm-sealed piston actuator is
used. This design features high reliability and
choice of actuator seal materials for virtually
ever
y application. An optional welded design is
also available for setpoints up to 1000 psi for
maximum reliability. This design is available in
316 SS or Monel. Differential pressure models
use a unique, dual diaphragm-sealed piston
design that features very high static operating
pressures and small size.
For setpoints between 4.5 and 150 inches of
H
2
O, a large diaphragm is used for increased
sensitivity in both pressure and differential
pressure designs with good choice of materials
of construction.
All standard models feature ±1 percent of
range setpoint repeatability and a minimum of
400 percent of range proof pressures.
These standard designs perform well in appli-
cations where shock and vibration could be a
problem and may be used in conjunction with
Ashcroft diaphragm seals in extreme services
such as slurries or abrasive process fluids.
Overpressure Ratings Approximate Deadband
(2)
Switch Element
Nominal Range
(1)
Proof psi Burst psi 20, 26, 27 21, 24, 31 50 22 32, 42
Vacuum
–30˝ Hg –760mm Hg -100 kPa 250 400 0.3-0.7 1.5-3.0 0.5-2.2 0.4-1.5 2.1-4.2
Compound
–15˝ H
2
O/ –375mm H
2
O/ –3.7 kPa/ 20 35 0.15-.75/ 1.5-2.5/ 0.45-2.0/ 0.5-1.2/ 2.1-3.5/
15˝ H
2
O 375mm H
2
O 3.7 kPa 0.15-.75 1.5-2.5 0.45-2.0 0.5-1.2 2.1-3.5
–30˝ H
2
O/ –760mm H
2
O/ –7.5 kPa/ 20 35 0.30-.60/ 1.5-2.5/ 0.45-2.0/ 0.5-1.5/ 2.1-3.5/
30˝ H
2
O 760mm H
2
O 7.5 kPa 0.30-.60 1.5-2.5 0.45-2.0 0.5-1.5 2.1-3.5
–30˝ Hg/ –760mm Hg/ –100 kPa/ 0.5-1.0/ 2.0-3.0/ 0.75-2.5/ 0.7-1.8/ 2.8-4.2/
15 psi 1.0 kg/cm
2
100 kPa 250 400 0.3-0.7 0.5-1.5 0 .5-1.0 0.7-1.4 0.7-2.1
–30˝ Hg/ –760mm Hg/ –100 kPa/ 1.0-1.5/ 3.0-6.0/ 1.2-4.5/ 1.4-2.4 4.2-8.4/
30 psi 2.0 kg/cm
2
200 kPa 250 400 0.3-0.8 1.0-2.0 0.7-1.5 0.4-1.3 1.4-2.8
–30˝ Hg/ –760mm Hg/ –100 kPa/ 2.0-3.0/ 5.0-9.0/ 2.5-7.0/ 2.8-4.5 7.0-12.0/
60 psi 4.0 kg/cm
2
400 kPa 250 400 0.7-1.5 3.0-5.0 1.1-4.0 1.0-2.3 4.2-7.0
Pressure
10˝ H
2
O 250mm H
2
O 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
30˝ H
2
O 750mm H
2
O 7.5 kPa 20 35 0.3-0.6 1.5-2.5 0.45-2.0 0.5-2.0 2.1-3.5
60˝ H
2
O 1500mm H
2
O 15 kPa 20 35 0.5-1.3 1.5-3.5 0.9-2.5 0.7-3.0 2.1-5.0
100˝ H
2
O 2500mm H
2
O 25 kPa 20 35 0.6-1.6 2.5-5.5 1.1-4.0 1.0-4.0 3.5-7.7
150˝ H
2
O 3750mm H
2
O 37 kPa 20 35 1.0-2.5 4.5-8.5 1.7-6.5 2.0-6.0 6.0-12.0
15 psi 1.0 kg/cm
2
100 kPa 500 1500 0.1-0.35 0.5-1.5 0.2-1.0 0.4-1.0 0.7-2.1
30 psi 2.0 kg/cm
2
200 kPa 500 1500 0.1-0.50 0.5-1.5 0.3-1.0 0.4-1.0 0.7-2.1
60 psi 4.0 kg/cm
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
100 psi 7.0 kg/cm
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
200 psi 14 kg/cm
2
1400 kPa 1000 3000 1-3 5-13 2-9 3.0-7.5 7.0-18.2
400 psi 28 kg/cm
2
2800 kPa 2400 3000 4-7.5 5-24 5.5-15 4.0-11.0 7.0-33.6
600 psi 42 kg/cm
2
4200 kPa 2400 3000 4-11 9-30 7-20 5.0-23.0 12.6-42
1000 psi 70 kg/cm
2
7000 kPa 12000 18000 7-30 30-110 18-70 15-80 42-154
3000 psi 210 kg/cm
2
2100 kPa 12000 18000 15-60 80-235 37-160 30.0-230 112-329
PRESSURE/VACUUM SWITCHES
DIFFERENTIAL PRESSURE SWITCHES
Pressure Ratings Approximate Deadband
(2)
Switch Element
Static Work-
Nominal Range
(1)
ing Pressure Proof psi 20, 26, 27 21, 24, 31 50 22 32, 42
30˝ H
2
O 750mm H
2
O 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
60˝ H
2
O 1500mm H
2
O 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
100˝ H
2
O 2500mm H
2
O 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
150˝ H
2
O 3750mm H
2
O 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
15 psid 1.0 kg/cm
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
30 psid 2.0 kg/cm
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
60 psid 4.0 kg/cm
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
100 psid 7.0 kg/cm
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
200 psid 14.0 kg/cm
2
1400 kPa 1000 4000 5.0-15.0 12.0-40.0 10.0-26.0 7.0-21.0 17.0-56.0
400 psid 28.0 kg/cm
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
600 psid 42 0 kg/cm
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
Values shown are for zero static working pressure.
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.
2 All deadbands are given in English units as shown in the nominal range
column. Deadbands shown are for switches with Buna N diaphragm.
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
Dual Switch Element: Multiply single switch element value by 1.6
for approximate deadband.