Omega Products DPG701 Installation Manual

User’s Guide

omega.com

®

www.omega.com

e-mail: [e-mail]

™

Series DPG701

Room Pressure Monitor

Servicing North America:

USA: One Omega Drive, P.O. Box 4047

ISO 9001 Certified Stamford CT 06907-0047

TEL: [phone] FAX: [phone]
e-mail: [e-mail]

Canada: 976 Bergar

Laval (Quebec) H7L 5A1
TEL: [phone] FAX: [phone]
e-mail: [e-mail]

For immediate technical or application assistance:

USA and Canada: Sales Service: 1-800-826-6342 / 1-800-TC-OMEGA

®

Customer Service: 1-800-622-2378 / 1-800-622-BEST

®

Engineering Service: 1-800-872-9436 / 1-800-USA-WHEN

®

TELEX: 996404 EASYLINK: 62968934 CABLE: OMEGA

Mexico: Tel: [phone] FAX: [phone]

En Espan˜ol: [phone]-7803 e-mail: [e-mail]

[e-mail]

Servicing Europe:

Benelux: Postbus 8034, 1180 LA Amstelveen, The Netherlands

TEL: [phone] FAX: [phone]
Toll Free in Benelux: 0800 0993344
e-mail: [e-mail]

Czech Republic: Rudé armády 1868, 733 01 Karviná

TEL: [phone] FAX: [phone]
Toll Free in Czech Rep.: 0800-1-66342 e-mail: [e-mail]

France: 9, rue Denis Papin, 78190 Trappes

TEL: [phone] FAX: [phone]
Toll Free in France: 0800-4-06342
e-mail: [e-mail]

Germany/Austria: Daimlerstrasse 26, D-75392 Deckenpfronn, Germany

TEL: [phone] FAX: [phone]
Toll Free in Germany: 0800 TC-OMEGA

SM

e-mail: [e-mail]

United Kingdom: One Omega Drive, River Bend Technology Centre

ISO 9002 Certified Northbank, Irlam, Manchester

M44 5EX, United Kingdom
TEL: [phone] FAX: [phone]
Toll Free in the United Kingdom: 0800 488 488
e-mail: [e-mail]

omega.comomega.com

OMEGAnet®On-Line Service Internet e-mail

www.omega.com [e-mail]

It is the policy of OMEGA to comply with all worldwide safety and EMC/EMI regulations that
apply. OMEGA is constantly pursuing certification of its products to the European New Approach
Directives. OMEGA will add the CE mark to every appropriate device upon certification.

The information contained in this document is believed to be correct, but OMEGA Engineering, Inc. accepts
no liability for any errors it contains, and reserves the right to alter specifications without notice.
WARNING: These products are not designed for use in, and should not be used for, patient-connected applications.

®

™

INSTALLATION, WIRING AND CALIBRATION

0 - 10V

0 - 5 V

4 - 20 mA

120/240 VAC

SEL. SWITCH

NO SELECTOR SWITCH WHEN POWERED FROM 24 VAC.

OF ROOM PRESSURE MONITOR

DPG701

1. GENERAL

The DPG701 monitors either positive or negative room pressures.
Refer to the Data Sheet for detailed specifications .

2. INSTALLATION

This instrument is designed for mounting on the surface of a wall by means of (3) #10 screws (5 mm screws).
Select a wall area which is reasonably flat to prevent stressing of the enclosure. A template is printed on a sepa­rate sheet to facilitate installation on a wall.

3. WIRING AND PIPING

3.1. Electrical connections

WARNING: Check setting of voltage selector

switch, 120/240 Vac, before applying power

to this instrument!

NOTE: There is no selector switch when this instrument is powered from a 24 Vac supply.
Connections are by means of a 3/8" terminal barrier with #6 screws.
Terminals 1 and 2 are the power supply connections.
Terminals 4, 5, and 6 are the relay output terminals.
Terminals 8 and 10 are the 0-5 V analog output. Terminals 8 and 9 are the 0-10 V analog output.
Terminals 11 and 12 are the 4-20 mA output, sourcing. Total loop resistance must be less than 580 Ohms.
It is recommended that the length of the signal wires connected to the voltage outputs be limited to about 18 feet
(6 m). The 4 - 20 mA output should be used if the signal wires are long.
A 15 volt supply with a maximum current of 13 mA is available from terminal 8 (COM) and terminal 3.
A light indicator status signal is accessible at terminal 7. The output is low (about 1 Volt) when pressure is within
normal condition (green led on).

120/240 VAC

SEL. SWITCH

RPTRMB01

J1

1 2 3 4

AC

POWER

AVAILABLE

SUPPLY

INPUT

NO SELECTOR SWITCH WHEN POWERED FROM 24 VAC.

15V

13mA

SUPPLY

Fig.1 T erminal connections

3.2. Pressure connections

To monitor the differential pressure between a room and a selected ref erence, connect the air line from the room to
be monitored to the fitting labeled "ROOM PRESSURE", and the air line from the reference area to the fitting
labeled "REFERENCE".
Three sets of barb fittings accomodate plastic tubing sizes from 1/8", to 7/32" I.D. (3 to 6 mm I.D.)

Do not overtighten the fittings, a 1/4 turn,

hand-tightening, is sufficient to insure

a leak-proof connection!

If the pressure in the room to be monitored is higher than the reference pressure, the digital display indicates a
positive pressure, and conversely, if the pressure in the room is less than the reference pressure, the digital display
indicates a negative pressure.

5

6 7 8 9 10 11 12

NO NC COM

RELAY OUT

LIGHT

INDICATOR

STATUS

SIGNAL

COM

0 - 10V

+

0-5V

+

+ -

4-20mA

4. DISPLAY PANEL

To open the clear polycarbonate cover, depress the ridged slot along the narrow side of the polycarbonate cover
and pull. The cover can be installed to hinge from the left or from the right. To remove the cover, open the co ver
and place thumbs along the inside hinge of cover, carefully push the cover forward (away from the case) while
pushing the hinge down. Use the same technique to remove the latch. To install the cover, align the cover to the
desired side, left or right of the body hinge retainers. Insert the centering pins in the cover through the two side
retainers on the case and pull up, the cover will snap into place. To install the optional cover lock, remove the blank
in cover lock assembly, insert optional key and press until slotted end is flush with cover.

4.1- Panel description

Refer to Fig. 2 Display panel to locate the various components of the panel.
A - Status selector switch and accompanying indicator lights: The selector switch allo ws for programming of

the red and green light which indicate when the pressure in the room is above or below a preset pressure.
When monitoring a positive pressure, set the selector switch to "+". The green LED is on when the
pressure is above the minimum set pressure. The red LED lights up if the pressure falls below the
allowed minimum pressure. When monitoring a negative room pressure, set the selector s witch to "-".
The green LED is on when the pressure, is below the minimum set pressure. The red LED lights up if the
pressure rises above the allowed minimum pressure.

B - Light adjust potentiometer: To change the light set pressure remove the plug marked "LIGHT" and turn

the potentiometer (clockwise to raise the pressure setpoint) until the desired set pressure is reached. The
setting may be determined by pressurizing the instrument until the status indicator light activates, the
pressure may be read from the display panel at the moment the light changes states. Refer to section

5.2.2 for a precise calibration procedure.

C - Relay adjust potentiometer: A SPDT relay output is available at terminals 4, 5, and 6 of connector J1

(See Fig. 1). The contacts are rated 5A at 30 Vdc or 120 Vac, 4A at 240 Vac resistive. Adjustment of
the relay set pressure is by means of a potentiometer located behind the plug marked "RELAY". Turn the
potentiometer (clockwise to raise the pressure setpoint) until the desired pressure is reached. The relay is
set at the factory to energize on falling pressure. To change the logic, see section 5.1.2. and refer to
section 5.2.2 for a precise calibration procedure.

D - Digital display: Displays the room pressure in engineering units, either English or metric. To change the

units of measurement, refer to section 5.2.1.
E - Unit indicating light: One of three lights indicates the unit of measure being displa yed.
F - Transmitter span adjust potentiometer: Should the pressure transmitter require recalibration, remove the

the plug to gain access to the potentiometer. It is recommended that the recalibration be performed in the

field only if proper calibrating equipment is available. Ref er to section 5.3 for calibration instructions .
G - Transmitter zero adjust potentiometer: Used during calibration of the instrument.

A
B
C

D
E

F
G

Fig.2 Display panel

5. ADDITIONAL CONTROLS

Disconnect the AC power to the instrument, and remove the front panel to gain access to the other controls.
Two interconnected PC Boards are seen. One PC board is labeled "RPM MAIN BOARD" and the other is labeled
"RPM DISPLA Y BO ARD".

5.1. Main Board

The main board consists of a power supply, a pressure sensing element and associated electronics, alarm circuitry
and a relay.

PRSKSA02

Fig.3 Main board

5.1.1 - To change the deadband of both, the lights and the relay, locate potentiometer R53, labeled DEADBAND,
and rotate the screw to the desired position. The deadband adjustment ranges from 0 to 20 %. Fluttering
indicator lights and chattering relay output indicate that the deadband is set too low. Increase the
deadband until chatter stops.

5.1.2 - To change the relay logic from energizing on falling pressure to energizing on rising pressure , locate
connector J5, remove both jumpers, rotate them 90° and re-insert.

5.2. Display Board

5.2.1 - To change from English to metric unit, locate the selector switch "SW2" on the display board and select
either "METRIC" (Pascals and kPascals) or "ENGLISH" (inches of water).

Fig.4 Display board

RPSKSA01

5.2.2 - Apply the AC power to the unit.

- To obtain a precise "LIGHT" adjust or "RELAY" adjust setting, locate testpoints "GND", "T4", and "T3"
on the display board.

- The testpoint voltage range is 0 - 5.0 Volts.

- To adjust the light set pressure , connect a voltmeter across "GND" and "T4" and adjust potentiometer
R4.

- A reading between 2.5 Volts and 5.0 Volts will activate the light when the room pressure is higher than
the reference pressure. A reading between 0 and 2.5 Volts will activate the light when the room pressure
is lower than the reference pressure .

- To adjust the relay set pressure connect the voltmeter across "GND" and "T3" and adjust potentiometer
R3.

- A reading between 2.5 Volts and 5.0 Volts will energize the relay when the room pressure is higher than
the reference pressure.

- A reading between 0 and 2.5 Volts will activate the relay when the room pressure is lower than the
reference pressure.

5.3. Calibration

To calibrate the transmitter , proceed as follows:

5.3.1 - Connect a voltmeter across terminals 8 (ground terminal) and 10 (5.00 Volt Output) of connector J1 on
the Main Board (refer to Fig. 1).

- Locate the "ZERO" potentiometer R2 and the "SPAN" potentiometer R1 on the display board (refer to
Fig. 4).

- With no pressure applied to the pressure ports, adjust the "ZERO" potentiometer R2 until the output
signal between terminals 8 and 10 of J1 is 2.50 Volts.

- Apply full pressure to the positive pressure port and adjust the "SPAN" potentiometer R1 until the
output signal is 5.00 Volts.

- Chec k the zero pressure output again and repeat the above steps if necessary .

- When the instrument is fully calibrated, pressurize the reference port. When full pressure is applied to
the reference port, the voltmeter should read 0 Volts. No adjustment is necessary.

5.3.2 - To check the 10 Volt output connect the positiv e side of the voltmeter to terminal 9 (10.00 Volt Output)
of connector J1.

- The output signal should read 5.00 V olts when no pressure is applied and 10.00 Volts at full pressure .

- No adjustment is necessary if the instrument has been calibrated as specified in step 5.3.1.

5.3.3 - To check the current output, first proceed with steps 5.3.1 abov e then connect an ammeter across
terminals 11 and 12 of connector J1.

- Locate the "4-20 mA ZERO ADJUST" R51 and the "4 - 20 mA SPAN ADJUST" R52 potentiometers on
the main board, (see Fig 3).

- With no pressure applied to the pressure ports, adjust the "ZERO" potentiometer R51 until the output
signal reads 12 mA.

- Apply full pressure and adjust the "SPAN" potentiometer R52 until the output signal is 20 mA.

- Check the zero pressure output again and repeat the above steps if necessary.

5.3.4 - Disconnect the AC power to the instrument and replace the front panel by carefully inserting the digital
panel meter terminals into the display socket J6.

- The digital display is calibrated at the factory and should not require recalibration.

INSTALLATION TEMPLATE

RPTPLB01

WARRANTY/DISCLAIMER

OMEGA ENGINEERING, INC. warrants this unit to be free of defects in materials and workmanship for a

period of 13 months from date of purchase. OMEGA’s Warranty adds an additional one (1) month grace

period to the normal one (1) year product warranty to cover handling and shipping time. This

ensures that OMEGA’s customers receive maximum coverage on each product.
If the unit malfunctions, it must be returned to the factory for evaluation. OMEGA’s Customer Service

Department will issue an Authorized Return (AR) number immediately upon phone or written request.
Upon examination by OMEGA, if the unit is found to be defective, it will be repaired or replaced at no
charge. OMEGA’s WARRANTY does not apply to defects resulting from any action of the purchaser,
including but not limited to mishandling, improper interfacing, operation outside of design limits,
improper repair, or unauthorized modification. This WARRANTY is VOID if the unit shows evidence of
having been tampered with or shows evidence of having been damaged as a result of excessive corrosion;
or current, heat, moisture or vibration; improper specification; misapplication; misuse or other operating
conditions outside of OMEGA’s control. Components which wear are not warranted, including but not
limited to contact points, fuses, and triacs.

OMEGA is pleased to offer suggestions on the use of its various products. However,
OMEGA neither assumes responsibility for any omissions or errors nor assumes liability for any
damages that result from the use of its products in accordance with information provided by
OMEGA, either verbal or written. OMEGA warrants only that the parts manufactured by it will be
as specified and free of defects. OMEGA MAKES NO OTHER WARRANTIES OR
REPRESENTATIONS OF ANY KIND WHATSOEVER, EXPRESS OR IMPLIED, EXCEPT THAT OF TITLE,
AND ALL IMPLIED WARRANTIES INCLUDING ANY WARRANTY OF MERCHANTABILITY AND FIT­NESS FOR A PARTICULAR PURPOSE ARE HEREBY DISCLAIMED. LIMITATION OF
LIABILITY: The remedies of purchaser set for th herein are exclusive, and the total liability of
OMEGA with respect to this order, whether based on contract, warranty, negligence,
indemnification, strict liability or otherwise, shall not exceed the purchase price of the
component upon which liability is based. In no event shall OMEGA be liable for
consequential, incidental or special damages.

CONDITIONS: Equipment sold by OMEGA is not intended to be used, nor shall it be used: (1) as a “Basic
Component” under 10 CFR 21 (NRC), used in or with any nuclear installation or activity; or (2) in medical
applications or used on humans. Should any Product(s) be used in or with any nuclear installation or
activity, medical application, used on humans, or misused in any way, OMEGA assumes no responsibility
as set forth in our basic WARRANTY/DISCLAIMER language, and, additionally, purchaser will indemnify
OMEGA and hold OMEGA harmless from any liability or damage whatsoever arising out of the use of the
Product(s) in such a manner .

RETURN REQUESTS / INQUIRIES

Direct all warranty and repair requests/inquiries to the OMEGA Customer Service Department. BEFORE

RETURNING ANY PRODUCT(S) TO OMEGA, PURCHASER MUST OBTAIN AN AUTHORIZED RETURN
(AR) NUMBER FROM OMEGA’S CUSTOMER SERVICE DEPARTMENT (IN ORDER TO AVOID
PROCESSING DELAYS). The assigned AR number should then be marked on the outside of the return
package and on any correspondence.

The purchaser is responsible for shipping charges, freight, insurance and proper packaging to prevent
breakage in transit.

FOR W

ARRANTY RETURNS, please have the
following information available BEFORE
contacting OMEGA:

1. Purchase Order number under which the product

was PURCHASED,

2. Model and serial number of the product under

warranty, and

3. Repair instructions and/or specific problems

relative to the product.

FOR NON-WARRANTY REPAIRS,

consult OMEGA
for current repair charges. Have the following
information available BEFORE contacting OMEGA:

1. Purchase Order number to cover the COST

of the repair,

2. Model and serial number of the product, and

3. Repair instructions and/or specific problems

relative to the product.

OMEGA’s policy is to make running changes, not model changes, whenever an improvement is possible. This affords
our customers the latest in technology and engineering.

OMEGA is a registered trademark of OMEGA ENGINEERING, INC.
© Copyright 1999 OMEGA ENGINEERING, INC. All rights reserved. This document may not be copied, photocopied,

reproduced, translated, or reduced to any electronic medium or machine-readable form, in whole or in part, without the
prior written consent of OMEGA ENGINEERING, INC.

MADE IN

Where Do I Find Everything I Need for

Process Measurement and Control?

OMEGA…Of Course!

TEMPERATURE

MU

Thermocouple, RTD & Thermistor Probes, Connectors, Panels & Assemblies

MU

Wire: Thermocouple, RTD & Thermistor

MU

Calibrators & Ice Point References

MU

Recorders, Controllers & Process Monitors

MU

Infrared Pyrometers

PRESSURE, STRAIN AND FORCE

MU

Transducers & Strain Gages

MU

Load Cells & Pressure Gages

MU

Displacement Transducers

MU

Instrumentation & Accessories

FLOW/LEVEL

MU

Rotameters, Gas Mass Flowmeters & Flow Computers

MU

Air Velocity Indicators

MU

Turbine/Paddlewheel Systems

MU

Totalizers & Batch Controllers

pH/CONDUCTIVITY

MU

pH Electrodes, Testers & Accessories

MU

Benchtop/Laboratory Meters

MU

Controllers, Calibrators, Simulators & Pumps

MU

Industrial pH & Conductivity Equipment

DATA ACQUISITION

MU

Data Acquisition & Engineering Software

MU

Communications-Based Acquisition Systems

MU

Plug-in Cards for Apple, IBM & Compatibles

MU

Datalogging Systems

MU

Recorders, Printers & Plotters

HEATERS

MU

Heating Cable

MU

Cartridge & Strip Heaters

MU

Immersion & Band Heaters

MU

Flexible Heaters

MU

Laboratory Heaters

ENVIRONMENTAL
MONITORING AND CONTROL

MU

Metering & Control Instrumentation

MU

Refractometers

MU

Pumps & Tubing

MU

Air, Soil & Water Monitors

MU

Industrial Water & Wastewater Treatment

MU

pH, Conductivity & Dissolved Oxygen Instruments

Series DPG701 M3489/0899