Dwyer instruments, inc – Dwyer BDPA User Manual

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WIRING DIAGRAMS

BATTeRY pOWeReD; SWITCH OUTpUT CONNeCTeD

24 VAC/VDC pOWeR WIRING

BATTERY ACTS AS BACK-UP POWER

24 VAC/VDC LINe pOWeR WIRING; SWITCH OUTpUT CONNeCTeD

BATTERY ACTS AS BACK-UP POWER

ReMOTe SNOOZe WIRING

SHOWN BATTERY POWERED

CAN BE COMBINED WITH LINE POWER

24 VAC/VDC LINe pOWeR; SWITCH OUTpUT CONNeCTeD

SEPARATE POWER FOR SUPPLY WITH SWITCH LOOP

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 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.

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 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.

Important: 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.

MAINTeNANCe
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.

Printed in U.S.A. 5/14

FR# R8-443824-00 Rev.3

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]