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1. Electrical Connection

10. PRESSOSTAT - INSTALLATION AND

OPERATING INSTRUCTIONS

The Series aDpS adjustable Differential pressure Switch is de-

signed for overpressure, vacuum, and differential pressure applica-

tions. The scaled adjustment knob allows changes to the switching

pressure to be made without a pressure gage. The ADPS is available

with settings from 0.08˝ w.c. (20 Pa) to 20˝ w.c. (5000 Pa). The sili-

cone diaphragm and PA 6.6 body make the Series ADPS perfect for

use with air and other noncombustible gases. The Series ADPS can

be used in monitoring air ﬁ lters, ventilators, and industrial cooling-air

circuits along with controlling air and ﬁ re-protection ﬂ aps and many

other applications.

Use only with mediums such as air, or other noncombustible or non-

aggressive gases. Otherwise operating faults or accidents may occur.

Mounting Switch

First check the pressure switch to ascertain whether any damage is

visible on the housing. If the housing is leaky because of damage, the

pressure switch must not be used.

Switching pressure speciﬁ cations apply to vertical installation which

is also the recommended position with pressure connections pointing

downwards.

Only if there is no potential for condensate forming can you mount

the pressure switch horizontally. In this case, however, the switching

values are approximately 0.08 in w.c. (20 Pa) higher as indicated

on the scale. In the horizontal position, the pressure switch should

be mounted 'lying down' only (that is to say with the electrical con-

nections pointing upwards). Do not mount the pressure switch in a

hanging position (that is to say, not 'overhead' with the electrical

connections pointing downwards). Otherwise the device will function

inaccurately.

a) Mounting with screws or brackets

1. To mount the pressure switch, L-shaped A-288 and S-shaped

A-289 mounting brackets can be ordered separately. To secure

the device on the rear side of the housing, only use the sheet

metal screws (3.5 x 8 mm) which are supplied together with

the mounting brackets. Under no circumstances must you use

longer screws. Otherwise, the base of the housing could be

punctured resulting in the pressure switch leaking.

2. You can also mount the pressure switch directly on a wall. To

do this use screws with a maximum diameter of 0.315˝ (8.0

mm), if you use the outer mounting lugs to screw the device

in place. Do not tighten the screws so much that the base of

the device is deformed. Otherwise, the pressure switch can be

shifted out of position, or leak.

2-17/64

[57.5]

Ø11/64

[Ø4.5]

21/64

[8.5]

(P2)

7/8

[22]

2-21/64

[59]

19/64

[7.5]

51/64

[18]

(P1)

SPECIFICATIONS

Service: Air and noncombustible, compatible gases.

Wetted Materials: Diaphragm material: Silicone; Housing material &

switch body: POM and PA 6.6; Cover: Polystyrene.

Temperature Limits: Process ambient temperature from -4 to 185˚F

(-20 to 85˚C).

Pressure Limits: Max. Operating Pressure: 40" W.C. (10 kPa) for all

pressure ranges.

Switch type: Single-pole double-throw (SPDT).

Repeatability: ±15% FS.

Electrical Rating: Standard: Max., 1.5A/250 VAC, max. switching

rate: 6 cycles/min.; Gold Contact Option: 0.1 A/ 24 VDC.

Electrical connections: Push-on screw terminals. M20x1.5 with

cable strain relief or optional 1/2˝ NPT connection.

Process connections: 5/16˝ (7.94 mm) outside diameter tubing,

1/4˝ (6.0 mm) inside diameter tubing.

Mounting orientation: Vertically, with pressure connections pointing

downwards.

Mechanical Working Life: Over 106 switching operations.

Weight: 5.6 oz (160 g).

Enclosure Rating: IP54.

Agency approvals: CE, RoHS.

Installing Hoses

Important: Pressure tubing cannot be kinked. Pay particular atten-

tion to this point if you run hoses over an edge. It is better to form a

loop. If the hoses are kinked, the device cannot function accurately.

a) For connection to the pressure switch two ﬁ ttings inherent in the

housing are provided for hoses with an internal diameter of 1/4˝

(6.0 mm).

1. Connect a hose with the higher pressure to socket P1 which is

located on the lower section of the housing.

2. Connect a hose with the lower pressure to socket P2 which is

located on the middle section of the housing.

After you have installed the hoses, it is absolutely essential to check

them for tightness of ﬁ t at the connection points and to make sure

that they run without any kinks.

2-9/16

[65]

1-31/32

[50]

Ø15/64

[Ø6]