Dwyer Instruments BDPA Series User manual
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"0-!-:1-;,2=;<)*4-1..-:-6<1)4:-;;=:-4):5 with built-in audible
and visual indication 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 BDPA 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 BDPA perfect for use with air and
other noncombustible gases. The Series BDPA can be used in monitoring air filters
and ventilators.
Use only with mediums such as air, or other noncombustible or non-aggressive
gases. Otherwise operating faults or accidents may occur.
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When system pressure reaches alarm point on knob, LED will flash once every 30
seconds while alarm buzzer will sound every 60 seconds. This indication will
continue until alarm condition is corrected or snooze button is pressed. If snooze
button is pressed the audible alarm and LED indication will cease for a three day
period. If after three days the alarm condition persists, the alarm buzzer and LED
indication will restart to notify the alarm condition is still present.
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First check the pressure alarm 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 specifications 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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587:<)6< 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 fittings 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 fit at the connection points, and to make sure that they run without any
kinks.
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Work on electrical installations must only be carried out by electricians who are
specifically trained for this purpose.
First make sure that there is no voltage on the connecting cable
while you are working on the electrical connections. Otherwise, a
possible electric shock may result and the connected equipment may be damaged.
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 first 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.
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!-:>1+-Air and noncombustible, compatible gases.
%-<<-,)<-:1)4;Diaphragm material: Silicone; Housing material: Switch body:
PA 6.6 and POM; Cover: Polystyrene.
"-58-:)<=:-151<;Process ambient temperature from 32 to 122°F
(0 to 50°C).
:-;;=:-151<;Max. operating pressure: 40 in w.c. (10 kPa) for all pressure
ranges.
4-+<:1+)4 )<16/C1.0 amp 30 VDC/VAC.
!?1<+0"A8-SPDT.
4):56,1+)<176 Red LED and audible alarm.
4):5->-4 Approximately 90 db at 4˝ (10 cm).
4):5+367?4-,/- Button press.
7?-: -9=1:-5-6<;16 to 30 VDC, 18 to 30 VAC or battery. If line power
supplied battery acts as back-up if power loss.
"A8-7.)<<-:A 1/2 AA LS14250.
)<<-:A1.- Approximately 1.5 years with 3.6 V/1.2 Ah.
-8-)<)*141<A±15% FS.
4-+<:1+)4766-+<176;Screw terminals. M20x1.5 with cable strain relief or
optional 1/2˝ PT connection.
:7+-;;766-+<176;5/16˝ (7.94 mm) outside diameter tubing, 1/4˝ (6.0 mm)
inside diameter tubing.
7=6<16/:1-6<)<176Vertically, with pressure connections pointing downwards.
%-1/0<6.1 oz (173 g).
6+47;=:- )<16/IP21.
/-6+A88:7>)4;CE, RoHS.
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19/64
[7.5]
51/64
[18]
(P2)(P1)
Ø11/64
[Ø4.5]
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[8.5]
2-9/16
[65]
1-31/32
[50]
Ø15/64
[Ø6] INSIDE VIEW
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#"
POWER
I PUT
CO TACT
OUTPUT
BATTERY
TEST/
S OOZE
BUTTO
LED
AUDIBLE
BUZZER
% C !
"" '% !%"#"#""
$$% %
BATTERY ACTS AS BACK-UP POWER
$$% % !%"#"#""
BATTERY ACTS AS BACK-UP POWER
"!(%
SHOW BATTERY POWERED
CA BE COMBI ED WITH LI E POWER
$$% !%"#"#""
SEPARATE POWER FOR SUPPLY WITH SWITCH LOOP
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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 alarm on
during an increase of pressure.
1. The indications on the dial are only correct for the vertical mounting
position.
2. When the pressure falls, the alarm returns to its resting position as soon
as the pressure falls below the dead band.
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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.
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Do not operate the system until the housing is closed. Otherwise there is the
possibility of a 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. To
test that audible alarm and LED light are functioning properly without connected
pressure, press the snooze button. The alarm buzzer and LED will activate for 1
second.
587:<)6< Observe the maximum permissible operating pressure of 40 in w.c. (10
kPa) which is indicated in the data sheet. Otherwise the pressure alarm may be
damaged.
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Upon final installation of the Series BDPA Adjustable Differential Pressure Alarm, no
routine maintenance is required other than possible battery replacement if used.
Roughly one week before the battery goes dead, the LED will pulse 3 times once
every minute while every fifth minute the alarm buzzer will synchronize with the LED
giving off 3 short signals notifying of a low battery. A periodic check of system
calibration is recommended. The Series BDPA is not field serviceable and should be
returned if repair is needed (field 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.
©Copyright 2014 Dwyer Instruments, Inc. Printed in U.S.A. 5/14 FR# R8-443824-00 Rev.3
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