Dwyer Instruments Series ADPS Differential Pressure Switch Installation and Operating Instructions
Series ADPS Differential Pressure Switch
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Specications - Installation and Operating Instructions
Bulletin E-80-ADPS
The Series ADPS Adjustable Differential Pressure Switch is designed for
overpressure, vacuum, and differential pressure applications. 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 in w.c. (20 Pa) to 20 in w.c. (5000 Pa).
The silicone 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
lters, ventilators, and industrial cooling-air circuits along with controlling air and reprotection 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 specications 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 connections
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.
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CABLE GLAND INSERT
SPECIFICATIONS
Service: Air and noncombustible, compatible gases.
Wetted Materials: Diaphragm material: Silicone; Housing material and switch body:
POM and PA 6.6; Cover: Polystyrene.
Temperature Limits: Process and ambient temperature: -4 to 185°F (-20 to 85°C);
Storage: -40 to 185°F (-40 to 85°C).
Pressure Limits: Max operating pressure: 40 in 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 10
Weight: 4.4 oz (125 g).
Enclosure Rating: IP54.
Agency Approvals: CE, RoHS.
Installing Hoses
Important: Pressure tubing cannot be kinked. Pay particular attention 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 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 t at the connection points and to make sure that they run without any kinks.
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[P2]
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switching operations.
[P1]
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DWYER INSTRUMENTS, INC.
Electrical Connection
3 COM
Work on electrical installations must only be carried out by electricians who are
specically trained for this purpose.
CAUTION
possible electric shock may result and the connected equipment may be damaged.
The connecting cable can be run to the pressure switch from three sides, according
to choice. The screw cable connection has a plug-in design for this purpose. Rotate
protective cover accordingly.
First make sure that there is no voltage on the connecting cable
while you are working on the electrical connections. Otherwise, a
Setting the Pressure Range
Make absolutely certain that there is no voltage on the electrical connections before
you carry out any setting on the pressure switch. Otherwise, it could be fatal if you
accidentally touch the electrical connections or the metal adjusting screw while you
are performing the settings.
a) Use the adjustment dial to set the pressure which should trip the switch on an
increase of pressure.
1. The indications on the dial are only correct for the vertical mounting position.
2. When the pressure falls, the switch returns to its resting position as soon as
the pressure falls below the dead band.
For cable gland models, the seal in the screw cable connection is designed for cables
with alternative sheath diameters of 0.275˝ (7 mm) or 0.393˝ (10 mm). Only use these
sizes – otherwise the screw cable connection cannot seal adequately.
1. If using a 0.275˝ (7 mm) connecting cable, you can line up the press nut, the plain
washer and the sealing ring directly on the cable.
2. If using a 0.393˝ (10 mm) connecting cable, you must rst break the inner rubber
ring out of the sealing ring directly on the cable. Then line up the press nut, the
plain washer and the sealing ring on the cable.
Wiring
The switching device in this pressure switch is designed as a change-over contact as
can be seen from the wiring diagram (Figure 1). The rest position is shown in Figure 1
(pressure below the activation switch point on dial).
1. In the instance where pole 3 (COM) closes to Pole 2, the pressure is increasing
(NO).
2. In the instance where pole 3 (COM) closes to Pole 1, the pressure is decreasing
(NC).
Protect the feed line (to pole 3) by fuse, either in control system or along the line, and
do so with:
1. Max 1.5 A / 250 VAC, if you are loading the contact with an resistive load.
2. Max 0.4 A / 250 VAC, if you are loading the contact with an inductive load (such
as relay).
3. Max 0.1 A / 24 VDC, if you are using the pressure switch in the weak current
version with gold-plated contacts.
The connections are intended for crimp-type sockets, 0.25 in (6.3 mm).
1. Make sure the crimp connection is perfect, and that the cable lugs t properly on
to the connections.
2. If you do not have any crimp-type sockets available, you can also use the cable
lugs which are supplied with mounted screw terminals. However, these are only
intended for rigid copper wire.
3. On ex, it is either necessary to crimp on strand end sleeves – and then you can
also screw the strands on – or to crimp cable lugs on directly as previously
described.
Attaching Cover
a) Insert the screw cable connection into the recess provided for this purpose on the
housing.
b) Then place the housing cover in position and screw it down evenly on to the
pressure switch.
Testing the Setting
Do not operate the system until the housing is closed. Otherwise there is the possibility
of an electric shock if you accidentally touch live parts.
Check the trip and reset pressures by slowly increasing the pressure and then allowing
it to fall again.
Important: Observe the maximum permissible operating pressure of 40 in w.c. (10
kPa) which is indicated in the data sheet. Otherwise the pressure switch may be
damaged.
MAINTENANCE
Upon nal installation of the Series ADPS Adjustable Differential Pressure Switch, no
routine maintenance is required. A periodic check of system operation is recommended.
The Series ADPS is not eld serviceable and should be returned if repair is needed
(eld repair should not be attempted and may void warranty). Be sure to include a
brief description of the problem plus any relevant application notes. Contact customer
service to receive a return goods authorization number before shipping.
2 NO
P
1. Break contact
2. Operating contact
3. Power supply line
1 NC
3
Figure 1
DWYER INSTRUMENTS, INC.
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Printed in U.S.A. 4/20 FR# 443602-00 Rev. 3©Copyright 2020 Dwyer Instruments, Inc.
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