Ashcroft D400 - Differential Pressure Switches - Manual

Installation and Maintenance Instructions for
D400 & D700 ASHCROFT ® Snap Action Switches
for Low Range Differential Pressure Control
INTRODUCTION
The Ashcroft differential pressure switch is a precision built con-
trol device which features a mechanical snap action switch.
Controllers are available for operation on various pressure differ-
entials with fixed or variable switching differentials. Also, manual
reset types are available for operation on increasing or decreas-
ing pressure. The manual reset types remain trlpped until reset
by pressing a button on the top of the enclosure. The standard
electrical switch Is SPDT and is available with various electrical
characteristics. Two SPDT switch elements mounted together
are available except on variable deadband and manual reset types. Various wetted material constructions for compatibility
with a wide range of pressure media maybe obtained.
The Ashcroft snap action differentiaI pressure switch is fur-
nished in the standard NEMA 4 and explosion proof NEMA 7
and 9 enclosure styles. Both enclosures are epoxy coated
aluminum castings.
All D400 Series controls with the suffix XG5 as part of their
catalog number are Underwriters Laboratories listed for gas and
oil service. Any control so marked has a pressure limit of 5.4 psi
on both the high and low side. Controls marked XG5HX are
constructed to increase the pressure limit to 40 psi.
4.03
(102)
Ø 0. 28 X 3 HOLES
(7)
0.2 2
(6)
3. 3 2
(84 )
3 . 2 6
(83 )
6. 0 7 (1 54 )
1. 57( 4 0 )
0. 50(1 3 )
1. 3 9
(3 5)
2. 78( 71 )
3 . 5 0 ( 89)
Ш 5. 1 2 (1 3 0 )
Ш 0. 34
2 HOLES
0. 36 (9)
0. 25
(6)
2. 27 (58)
1. 25
(32)
2. 77
(70)
5. 62
(14 3 )
3. 0 6
(78)
2. 96 ( 75) 3/4 NPT
1/4 NPT
FEMALE
BRACKET WHEN
REQURIED “XBP” VARIATION
5.20 (132)
3.62
(92)
2.18
(55)
0.32
(8)
4.37
(111)
1.37
(35)
Ø 0 . 2 8 x 3 HOLES ( 7)
1. 93
(49)
2 . 78 (71 )
3. 50(89)
Ш 5. 1 2 (1 3 0 )
0. 36 (9)
0. 50
( 13 )
0. 36
(9)
Ш 0 . 3 4 X 2 HOLES (9)
1. 3 9
(3 5)
6.4 3
(1 6 3 )
1 . 4 3
(3 6)
Ø 3 . 9 0
(99)
0. 03
(1 )
3. 58(91 )
0. 3 1 (8)
3. 0 6
(78)
5.62
(14 3 )
1. 2 2 (3 1 )
1. 11
(2 8 )
1/4 NPT FEMALE
HIGH PRESSURE PORT
3/4 NPT 2 HOLES
BRACKET WHEN
REQUIRED "XBP" VARIATION
1/4 NPT FEMALE
LOW PRESSURE PORT
D400
D700
2.7 lb
(1.2 kg)
3.6 lb
(1.6 kg)
STANDARD RANGES
30, 60, 100, 150 ˝H
2
O Diff.
© 2007 Ashcroft Inc., 250 East Main Street, Stratford, CT 06614-5145, USA, Tel: 203-378-8281, Fax: 203-385-0499, www.ashcroft.com
All sales subject to standard terms and conditions of sale. I&M009-10009-10/00 (250-2289E) AMR 12/07