Omega Products PX2670 Installation Manual

User’s Guide

http://www.omega.com

email: [e-mail]

MODEL PX2670

Low Pressure Tranducers

and T ransmitters

OMEGAnet On-Line Service Internet e-mail
http://www.omega.com [e-mail]

Servicing North America:

USA: One Omega Drive, 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 techincal or application assistance:

USA and Canada Sales Service: 1-800-826-6342/1-800-TC-OMEGASM
Customer Service: 1-800-622-2378/1-800-622-BESTSM
Engineering Service: 1-800-872-9436/1-800-USA-WHENSM
TELEX:996404 EASYLINK: 62968934 CABLE: OMEGA
Mexico and Latin America: Tel: [phone] FAX: [phone]

En Espan~ol: (95) 203-359-7803 email: [e-mail]

Benelux: Postbus 8034, 1180 LA Amstelveen, The Netherlands

Servicing Europe:

Tel: [phone] FAX: [phone]

Czech Republic ul. Rude armady 1868, 733 01 Karvina-Hranice
Tel: [phone] FAX: [phone]

France: 9, rue Denis Papin, 78190 Trappes
Tel: [phone] FAX: [phone]

Germany/Austria: Daimlerstrasse 26, D-75392 Deckenpfronn, Germany
Tel: [phone] FAX: [phone]

United Kingdom: One Omega Drive, River Bend Technology Centre
ISO 9002 Certified Northbank, Irlam, Manchester

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.

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

Toll Free: 0800-1-66342 e-mail: [e-mail]

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

Toll Free in Germany: 0130 11 21 66
e-mail: [e-mail]

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

SS2045 03/24/99 Rev.A

General Information
The PX2670 Series pressure transducers and transmitters sense differential pressure and

gage (static) pressure and convert this pressure difference to a proportional high level
analog output for both unidirectional and bidirectional pressure ranges. Two versions are
offered: the voltage model transducer with 0 to 10 VDC output and the current model
transmitter with 4 to 20 mA output.

Environmental Conditions
The PX2670 Series is designed to be operated and stored in the following environmental

conditions:

Temperature - The PX2670 is designed to operate and be stored with the
following temperature limitations:

Operating: 0 to 150°F (-18 to 65°C)
Storage: -65 to 180 °F (-54 to 82°C)

Position Effect:

Range Zero Offset
0 to .1” WC 2.1% FS
0 to 1” WC .22% FS
0 to 5” WC .14% FS
0 to 30” WC .06% FS

Electrical Connections
Wiring is through a standard PG13.5 cable strain relief. Wiring terminations are identified

on the circuit board below the terminal strip (see Figure 1). To access the terminal strip,
remove the cover by unscrewing the 2 captive screws on top of the case.

Voltage Models
The voltage model is a 3-wire circuit. The standard voltage model can operate from
either 24 VAC or 24 VDC excitation with a 0 to 10 VDC output. The input tolerances are
as follows:

24 VAC can operate from 9 to 30 VAC
24 VDC can operate from 12 to 40 VDC

Electrical
Connections

+EXC GND +SIG

Voltage

Span

Zero

Zero & Span
Adjustment

Figure 1

Electrical
Connections

+EXC -

Zero & Span
Adjustment

Current

Span
Zero

The Model 267 voltage output is a 3-wire circuit, with three terminals available for wiring
(see Figure 1). The -Excitation and -Output are commoned on the circuit (see Figure 2A).
The 267 voltage output can operate from either AC (9-30 VAC) or DC (12-40 VDC)
excitation. The 267 has a 0-10 VDC output, calibrated at the Factory.

Figure 2

Power

Supply

PX 2670

Transmitter

(4 to 20 mA)

+
+

_

_
+

(Monitor)

_

Load

Figure 2A

Power

Supply

PX 2670

Transducer

(Voltage)

+
+

_

_
+

Load

(Monitor)

_

Current Models
The current output transmitters are true 2-wire (See Figure 2), 4-20 mA current devices

and deliver rated current into any external load of 0-800 ohms. The 4-20 mA current
units are designed to have current flow in one direction only - please observe polarity.
The PX2670 can operate over a voltage range of 9 to 30 VDC. It has been factory
calibrated at 24 VDC into a 250 ohm load. The minimum and maximum power supply
must be capable of delivering these voltages to the PX2670. Thus, the
minimum and maximum power supply calculation is shown and depicted in Figure 4.

MIN Supply Voltage: 9 + 0.02 x (resistance of receiver plus line)
MAX Supply Voltage: 30 + .004 x (resistance of receiver plus line)

Mounting and Pressure Fittings

Mounting

The PX2670 Series are designed to be mounted with the two holes located on the base
of the housing. The holes are sized to accept a #8 screw.

Fittings

Two (2) 3/16” O.D. pressure fittings are supplied for pressure signal connection with a
1/4” push on tubing. Both positive (high) and negative (low) pressure ports are located
on the bottom face side of the unit. For best results (shortest response time), 3/16” I.D.
tubing is suggested for tube lengths up to 100 feet long, 1/4” I.D. for tube lengths up to
300 feet long, and 3/8” I.D. for tubing lengths up to 900 feet. The high and low ports are
labeled next to each respective port (see Figure 3).

Calibration

Figure 3

All PX2670 Series pressure transducers
and transmitters are factory calibrated and
should require no field adjustment. How­ever, both zero and span adjustments are
accessible under the cover of the unit (see Figure 1), below and to the right of the
terminal strip. Whenever possible, any zero and span adjustments should be corrected
by software in the user’s control system. Us the zero and span adjustments only if
necessary. The PX2670 Series are calibrated in the vertical position at the factory
(baseplate vertical). For use in other orientations, position the unit and follow the zero
adjustment procedure listed below. Pressure ranges are fixed and cannot be changed
in the field. If a range change is required, contact the factory for a replacement PX2670
model with the appropriate pressure range.

Zero Adjustment - Voltage

While monitoring the voltage between the positive output (+OUT) and common (-OUT),
and with both ports open to atmosphere, the zero may be adjusted. For unidirectional
pressure ranges, turn the zero adjustment screw until a reading of 0.050 VDC is
achieved. For bidirectional pressure ranges set to 5 VDC.

Zero Adjustment - Current

While monitoring the current output with both ports open to atmosphere, the zero may be
adjusted. For unidirectional pressure ranges, turn the zero adjustment screw until a
reading of 4 mA is achieved. For bidirectional pressure ranges, set the zero to 12 mA.

Span Adjustment - Voltage

Span or full scale output adjustments should only be performed by using an accurate
pressure standard (electronic manometer, digital pressure gage, etc.) with at least
comparable accuracy as the PX2670 Series. With full scale pressure applied to the high
pressure port, adjust span for full scale electrical output of 10.05 VDC.

Example 1: Unidirectional pressure range of 0 to 1” WC and 0.05

to 10.05 VDC output. Apply 1” WC to the high
pressure port and adjust span as close as practical to

10.05 VDC.

Span Adjustment - Current

Span or full scale output adjustments should only be performed by using an accurate
pressure standard (electronic manometer, digital pressure gage, etc.) with at least
comparable accuracy as the PX2670 Series. With full scale pressure applied to the high
pressure port, adjust span for full sale electrical output of 20mA.

Example 1: Unidirectional pressure range of 0 to 1” WC

Apply 1” WC to the high pressure port and adjust span as close
as practical to 20 mA.

Example 2: Bidirectional pressure range of ±5” WC

Apply 5” WC to the high pressure port and adjust span
as close as practical to 20 mA.
Apply -5” WC to the high pressure port and adjust span
as close as practical to 4 mA.

Figure 4

Loop Power Supply

vs.

Loop Resistance for 4 to 20mA Transmitters

800

Operating

Range

Loop Resistance (Ohms)

0

9

Loop Supply Voltage (Vdc)

30

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 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 W ARRANTY 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’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 WHATSO EVER, 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 forth 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/INQUIRES

Direct all warranty and repair requests/inquires 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 SER VICE DEPARTMENT (IN ORDER TO AVOID PROCESSING DELA YS).
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 WARRANTY 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.

OMEGA’s policy is to make running changes, not model changes. 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.

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.

Where Do I Find Everything I Need for

Process Measurement and Control?

OMEGA...Of Course!

TEMPERATURE

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

● Wire: Thermocouple, RTD & Thermistor

● Calibrators & Ice Point References

● Recorders, Controllers & Process Monitors

● Infrared Pyrometers

PRESSURE, STRAIN AND FORCE

● Transducers & Strain Gauges

● Load Cells & Pressure Gauges

● Displacement Transducers

● Instrumentation & Accessories

FLOW/LEVEL

● Rotameters, Gas Mass Flowmeters & Flow Computers

● Air Velocity Indicators

● Turbine/Paddlewheel Systems

● Totalizers & Batch Controllers

pH/CONDUCTIVITY

● pH Electrodes, Testers & Accessories

● Benchtop/Laboratory Meters

● Controllers, Calibrators, Simulators & Pumps

● Industrial pH & Conductivity Equipment

DA TA ACQUISITION

● Data Acquisition & Engineering Software

● Communications-Based Acquisition Systems

● Plug-in Cards for Apple, IBM & Compatibles

● Datalogging Systems

● Recorders, Printers & Plotters

HEATERS

● Heating Cable

● Cartridge & Strip Heaters

● Immersion & Band Heaters

● Flexible Heaters

● Laboratory Heaters

ENVIRONMENTAL
MONITORING AND CONTROL

● Metering & Control Instrumentation

● Refractometers

● Pumps & Tubing

● Air, Soil & Water Monitors

● Industrial W ater & Wastewater Treatment

M-3243/0399