Dwyer BDPA - Manual

Series BDpA Adjustable Differential pressure Alarm
Specifications - Installation and Operating Instructions
e-80-BDpA
The Series BDpA Adjustable Differential pressure Alarm 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.
Alarm function
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.
Mounting Alarm
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.
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 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.
electrical Connection
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.
DWYeR INSTRUMeNTS, INC.
phone: 219/879-8000 www.dwyer-inst.com
p.O. BOX 373 • MICHIGAN CITY, INDIANA 46360, U.S.A. fax: 219/872-9057 e-mail: [email protected]
SpeCIfICATIONS
Service: Air and noncombustible, compatible gases.
Wetted Materials: Diaphragm material: Silicone; Housing material: Switch body:
PA 6.6 and POM; Cover: Polystyrene.
Temperature Limits: Process ambient temperature from 32 to 122°F
(0 to 50°C).
pressure Limits: Max. operating pressure: 40 in w.c. (10 kPa) for all pressure
ranges.
electrical Rating: 1.0 amp 30 VDC/VAC.
Switch Type: SPDT.
Alarm Indication: Red LED and audible alarm.
Alarm Level: Approximately 90 db at 4˝ (10 cm).
Alarm Acknowledge: Button press.
power Requirements: 16 to 30 VDC, 18 to 30 VAC or battery. If line power
supplied battery acts as back-up if power loss.
Type of Battery: 1/2 AA LS14250.
Battery Life: Approximately 1.5 years with 3.6 V/1.2 Ah.
Repeatability: ±15% FS.
electrical Connections: 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.
Weight: 6.1 oz (173 g).
enclosure Rating: IP21.
Agency Approvals: CE, RoHS.
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CAUTION
POWER
INPUT
CONTACT
OUTPUT
BATTERY
TEST/
SNOOZE
BUTTON
LED
AUDIBLE
BUZZER