aldes VEX 790T Assembly & Maintenance Manual - Page 16
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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)
16
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]