Omega Products PX835 Installation Manual

User’s Guide

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PX835

M-5089/0112

PX835 EXPLOSION/FLAME PROOF

.83˝

4.78˝

3.065˝

.675˝

1.06˝

DIA.

.83˝

4.78˝

3.065˝

.885˝

1.06˝ (27) Hex.
Common For All
Pressure Fittings

(21)

(121)

(78)

(17)

(22)

(78)

(121)

(21)

(27)

1.06˝

DIA.

(27)

.83˝

4.78˝

3.065˝

.885˝

1.06˝ (27) Hex.
Common For All
Pressure Fittings

(22)

(78)

(121)

(21)

1.06˝

DIA.

(27)

PRESSURE TRANSMITTER
INSTRUCTION SHEET
M-5089/0112

WARNING! READ



BEFORE INSTALLATION

1. GENERAL:

A failure resulting in injury or dam-

ge may be caused by excessive

a

overpressure, excessive vibration or
pressure pulsation, excessive instru­ment temperature, corrosion of the
pressure containing parts, or other
misuse.

2. OVERPRESSURE:

Pressure spikes in excess of the rated
overpressure capability of the trans­ducer may cause irreversible electri-
cal and/or mechanical damage to the
pressure measuring and containing
elements.

Fluid hammer and surges can destroy
any pressure transducer and must
always be avoided. A pressure snubber
should be installed to eliminate the
damaging hammer effects. Fluid ham­mer occurs when a liquid flow is sud­denly stopped, as with quick closing
solenoid valves. Surges occur when

flow is suddenly begun, as when a
pump is turned on at full power or a

alve is quickly opened.

v

iquid surges are particularly damag-

L

ing to pressure transducers if the pipe
is originally empty. To avoid damaging
surges, fluid lines should remain full (if
possible), pumps should be brought up
to power slowly, and valves opened
slowly. To avoid damage from both fluid
hammer and surges, a surge chamber
should be installed.

Symptoms of fluid hammer and surge's
damaging effects:

• Pressure transducer exhibits an out­put at zero pressure (large zero offset).

• Pressure transducer output remains
constant regardless of pressure

• In severe cases, there will be no output.

FREEZING:

Prohibit freezing of media in pressure
port. Unit should be drained (mount in
vertical position with electrical termina­tion upward) to prevent possible over­pressure damage from frozen media.

3. STATIC ELECTRICAL CHARGES:

Any electrical device may be suscepti-

le to damage when exposed to static

b
electrical charges. To avoid damage to
the transducer observe the following:

• Operator/installer should follow the
proper ESD (electrostatic discharge)
protection procedures before handling
the pressure transducer.

• Ground the body of the transducer
BEFORE making any electrical
connections

• When disconnecting, remove the
ground LAST!

Note: The shield and drain wire in the
cable (if supplied) is not connected to
the transducer body, and is not a suit­able ground.

Omega®PX835 Pressure Transmitter, Typical Dimensions and Construction*

Conduit
electrical
termination

Dimensions and construction details may vary based on product specified.

*

PX835 EXPLOSION/FLAME PROOF

+

+

–

P

OWER

SUPPLY

(

+)

(

–)

TRANSDUCER

–

V

+

V–

P

IN 1

P

IN 2

4-20mA

METER

OR OTHER DEVICE

+

+

–

–

POWER
SUPPLY

METER

OR OTHER DEVICE

TRANSDUCER

(

Common)

(+ Power)

(+ Output)

PIN 1

PIN 2

PIN 3

3-Wire Voltage

.830

FLYING LEADS

ELECTRICAL TERMINATION

CONDUIT - 1/2 NPT MALE

1.062

.830

PIGTAIL

ELECTRICAL TERMINATION

CONDUIT - 1/2 NPT MALE

(C1), (P7)

1.062

.830

FLYING LEADS

ELECTRICAL TERMINATION

CONDUIT - 1/2 NPT MALE

(C2), (C3), (C4)

1.062

PRESSURE TRANSMITTER
INSTRUCTION SHEET
M-5089/0112

Mounting

The PX835 transmitter requires no
special mounting hardware, and can be
mounted in any plane with negligible posi­tion error.

Although the unit can withstand normal
vibration without damage or significant
output effects, it is always good practice
to mount the transducer where there is
minimum vibration.

For units with NPT type pressure fittings
apply Teflon

®

tape or an equivalent

sealant to the threads before installing.

When tightening, apply a wrench to the
hex wrench flats located just above the
pressure fitting. DO NOT tighten by using
a pipe wrench on the housing.

Power Supply

Power Supply Voltage

Output Signal Min Max

1-5Vdc 10V 30V
4-20mA* 12V 36V**

* For transmitters with 4-20mA output

signal, the minimum voltage at the temi­nals is 12Vdc. However, the minimum
supply voltage should be calculated
using the following graph and formula.

** For Intrinsically Safe Installations max,

supply voltage is 30Vdc.

Loop Supply Voltage vs. Loop Resistance

1000

800

600

400

200

Loop Resistance (Ohms)

Vmin = 12V+ (.022A x RL) (includes a 10% safety factor)
R

= RS+ R

L

RL= Loop Resistance (ohms)
R

= Sense Resistance (ohms)

S

= Wire Resistance (ohms)

R

W

30 Vdc max for
Intrinsically Safe
Installations

0

10

Loop Supply Voltage (Vdc)

W

Operating

Region

20

Noise

For minimum noise susceptibility, avoid
running the transducer’s leads in a con­duit that contains high current AC power
cables. Where possible avoid running the
cable near inductive equipment..

Wire Voltage Current
Color Output Output

Red (+) Power (+) Power
White (+) Output None
Black (–) Power (–) Power

PX835 Wiring Diagrams

PX835 transducer has internal
transient protection: for safety, limit
line-to-ground voltage to 36 Vdc max.

HAZARDOUS AREA CERTIFICATIONS

Explosion Proof* – cUL: Specify A2X
Class I, Div. 1 & 2, Groups A, B, C and D
Class II, Div. 1 & 2, Groups E, F and G

Flame Proof* – ATEX: Specify A2X

II 2 GD
Ex d IIC T4
Ex nC IIC T4

Intrinsically Safe (applies to 4-20mA) FM/CSA:

Intrinsic Safety: Class I, II and III Div.1 and 2,

Non-Incendive: Class I, II and III Div.1 and 2,

See Omega drawing #825A027

Groups A, B, C, D, F and G, no
barriers needed

Wire Voltage Current

Color Output Output

Red (+) Power (+) Power
White (+) Output None
Black (–) Power (–) Power

* Model PS835 enclosure is intended for

installation using metallic conduit and
requires installer to comply with appropri­ate codes to complete proper installation

30

36

to meet the assigned hazardous area
designation.

SHIELDED CABLE (PIG TAIL)

ELECTRICAL TERMINATION

CONDUIT - 1/2NPT MALE

OMEGAnet®Online Service Internet e-mail

omega.com [e-mail]

Servicing North America:

B

U.S.A.: Omega Engineering, Inc., One Omega Drive, P.O. Box 4047

ISO 9001 Certified S

C

anada:

tamford, CT 06907-0047
Toll-Free: 1-800-826-6342 Tel: [phone]
FAX: [phone] e-mail: [e-mail]

976 Bergar
Laval (Quebec), Canada H7L 5A1
Toll-Free: 1-800-826-6342 TEL: [phone]
FAX: [phone] e-mail: [e-mail]

enelux:

Czech Republic: Frystatska 184

F

rance:

For immediate technical or application assistance:

U.S.A. 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

®

®

Mexico: En Español: 001 [phone] FAX: [phone]

[e-mail] e-mail:[e-mail]

It is the policy of OMEGA Engineering, Inc. to comply with all worldwide safety and EMC/EMI regulations that apply. OMEGA is constantly pursuing certification of its

roducts to the European New Approach Directives. OMEGA will add the CE mark to every appropriate device upon certification.

p

he information contained in this document is believed to be correct, but OMEGA accepts no liability for any error s it contains, and reserves the right to alter specifications without notice.

T
WARNING: These products are not designed for use in, and should not be used for, human applications.

G

ermany/Austria:

®

United Kingdom: OMEGA Engineering Ltd.

ISO 9001 Certified O

Servicing Europe:

Managed by the United Kingdom Office
Toll-Free: 0800 099 3344 TEL: [phone]
FAX: [phone] e-mail: [e-mail]

33 01 Karviná, Czech Republic

7
Toll-Free: 0800-1-66342 TEL: [phone]
FAX: [phone] e-mail: [e-mail]

Managed by the United Kingdom Office

oll-Free: 0800 466 342 TEL: [phone]

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

Daimlerstrasse 26, D-75392 Deckenpfronn, Germany
Toll-Free: 0 800 6397678 TEL: [phone]
FAX: [phone] e-mail: [e-mail]

ne Omega Drive, River Bend Technology Centre, Northbank
Irlam, Manchester M44 5BD England
Toll-Free: 0800-488-488 TEL: [phone]
FAX: [phone] e-mail: [e-mail]

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 in which wear is not
warranted, include but are 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 the company will be as specified and free of
defects. OMEGA MAKES NO OTHER WARRANTIES OR REPRESENTATIONS OF ANY KIND WHATSOEVER, EXPRESSED 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.

Direct all warranty and repair requests/inquiries to the OMEGA Customer Service Department. BEFORE RETURNING ANY PRODUCT(S) TO OMEGA,

RETURN REQUESTS/INQUIRIES

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 WARRANTY
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, 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 20 09 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.

RETURNS, please have the following information

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.