Omega Vehicle Security Heat Pump PX791 User Manual

Users Guide  
TM  
omega.com  
®
PX791 & PX792 Series  
Sanitary Pressure Transducer  
 
PX791 & PX792 SERIES  
OMEGA® SANITARY PRESSURETRANSDUCER  
INSTRUCTION SHEET  
W A R N I N G !  
This instrument is susceptible to damage when exposed to static  
electrical charges. To avoid damage to the transducer observe the  
following:  
• Ground the body of the transducer BEFORE making any electrical  
connections  
• When disconnecting, remove the ground LAST.  
NOTE: The braided shield and drain wire in the cable (if supplied) is not  
connected to the transducer body, and is not a suitable ground.  
CAUTION: Pressure spikes in excess of the rated overpressure capabil-  
ity of the transducer may cause irreversible electrical and/or mechani-  
cal damage to the pressure measuring and containing element(s).  
Excitation (Ratiometric Output Only)  
Mounting  
For proper operation a voltage within the range  
of 5 to 10 Vdc must be applied between the  
transducer’s supply terminals.  
Although the unit can withstand normal vibra-  
tion without damage or significant output  
effects, it is always good practice to mount the  
transducer where there is minimum vibration. Be  
sure to use a gasket that does not interfere with  
the sanitary diaphragm. If the gasket I.D. is  
smaller than 1.50 inches, an offset due to  
clamping force will occur.  
Noise  
For minimum noise susceptibility, avoid running  
the transducer’s cable in a conduit that contains  
high current AC power cables. Where possible  
avoid running the cable near inductive equipment.  
Power Supply  
The supply voltage for the 1-5 and  
Shield Wiring  
Connect the braided shield to the guard terminal  
on the reading instrument (meter, etc.) if avail-  
able or to ground or to the power supply nega-  
tive terminal.  
1-6 Vdc output transducers must be within the  
range of 10 to 36 Vdc. The maximum supply  
voltage for a 4-20mA current output transducer  
is 36 Vdc while the minimum supply voltage is  
dependent upon the loop resistance of the circuit.  
Refer to Figure 1. The loop supply voltage vs.  
loop resistance shows the minimum supply  
voltage (Vmin) required for a given loop resistance  
(RLOOP).  
Adjustment Potentiometers  
The zero and span pots are accessible through  
the top of the case. Loosen the four screws and  
separate the top carefully. The zero pot is marked  
with a white dot.  
 
PX791 & PX792 Series  
Vent Tube  
The cable will have a clear Teflon vent tube that's  
required at pressure below 500 psi to provide  
atmospheric reference. The open end should be  
placed in a dry area.  
Dimensions  
A
Life Support Policy  
These products are not authorized for use as  
critical components in life support devices or  
systems. As used herein:  
1. Life support devices or systems are devices or  
systems which, (a) are intended for surgical  
implant into the body, or (b) support or sustain  
life, and whose failure to perform, when prop-  
erly used in accordance with instructions for  
use provided in the labeling, can be reasonably  
expected to result in a significant injury  
to the user.  
B
2. A critical component is any component of a life  
support device or system whose failure to per-  
form can be reasonably expected to cause the  
failure of the life support device or system, or  
to affect its safety or effectiveness.  
C
D
Figure 1. Loop Supply Voltage vs. Loop Resistance  
MODEL  
S15  
A
B
C
D
SERIES  
PX791  
PX792  
0.8  
0.8  
4.7  
4.7  
0.9  
0.9  
2.0  
2.5  
Loop Supply Voltage vs.  
Loop Resistance  
for 4-20mA Output Only  
S20  
1182  
1000  
750  
500  
250  
0
0
10  
20  
30 36  
Loop Supply Voltage (Vdc)  
Vmin = 10V + [.022A*(RL)]  
*includes a 10% safety factor  
RL = RS + RW  
RL = Loop Resistance (ohms)  
RS = Sense Resistance (ohms)  
RW = Wire Resistance (ohms)  
 
PX791 & PX792 SANITARY TRANSDUCERS –  
ELECTRICAL CONNECTIONS  
Voltage Output Units 1-5, 1-6 Vdc  
WARNING:  
READ BEFORE  
INSTALLATION  
CABLE TYPE F2  
Red  
=
=
=
+Power  
Common  
Output  
White  
Green  
The diaphragm is very sensitive and fragile!  
Do not let anything touch the diaphragm but  
the fluid to be measured. 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 valve is quickly opened.  
CABLE TYPE C1  
Red  
=
=
=
+
Power  
White  
Green  
Common  
Output  
HIRSCHMANN TYPE  
PIN-1  
PIN-2  
PIN-4  
=
=
=
+Power  
Common  
Output  
BENDIX 4-PIN, 6-PIN  
Pin A  
Pin B  
Pin D  
=
=
=
+Power  
Output  
Common  
Current Output Units 4-20mA  
Liquid surges are particularly damaging 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.  
CABLE TYPE F2  
Red  
=
=
+Power  
Power  
Black  
CABLE TYPE C1  
Red  
=
=
+Power  
Power  
Black  
HIRSCHMANN TYPE  
Pin-1  
Pin-2  
=
=
+Power  
Power  
Symptoms of fluid hammer and surge's  
damaging effects:  
a) Pressure transducer exhibits an output  
at zero pressure (large zero offset). If  
zero offset is less than 10% FS, user  
can usually re-zero transducer, install  
proper snubber and continue  
BENDIX 4-PIN, 6-PIN  
Pin A  
Pin B  
=
=
+Power  
Power  
Ratiometric (mV/V)  
CABLE TYPE F2  
monitoring pressures.  
Red  
=
=
=
=
+Power  
– Power  
+Output  
– Output  
White  
Green  
Black  
b) Pressure transducer output remains  
constant regardless of pressure.  
CABLE TYPE C1  
c) In severe cases, there will be no  
output.  
Red  
=
=
=
=
+Power  
– Power  
+Output  
– Output  
White  
Green  
Black  
HIRSCHMANN TYPE  
Pin A  
Pin B  
Pin C  
Pin D  
=
=
=
=
+Power  
+Output  
– Output  
– Power  
BENDIX 4-PIN, 6-PIN  
Pin A  
Pin B  
Pin C  
Pin D  
Pin E  
Pin F  
=
=
=
=
=
=
+Power  
– Power  
+Output  
– Output  
Shunt Cal.  
Shunt Cal.  
 
WIRING DIAGRAMS FOR ALLTRANSDUCERS  
+
RED  
(+ Power)  
POWER  
SUPPLY  
WHITE (- Power)  
TRANSDUCER  
(+ Output)  
(- Output)  
GREEN  
BLACK  
+
METER  
4-Wire Ratiometric (mV/V)  
+
(+ Power)  
POWER  
SUPPLY  
(Common)  
TRANSDUCER  
+
(+ Output)  
METER  
3-WireVoltage  
POWER  
SUPPLY  
+
(+)  
POWER  
TRANSDUCER  
OUTPUT  
(–)  
+
METER  
4-20mA  
 
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 PUR-  
POSE 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 / 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 OMEGAS 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 RETURNS, please have the  
following information available BEFORE  
contacting OMEGA:  
FOR NON-WARRANTY REPAIRS, consult OMEGA  
for current repair charges. Have the following  
information available BEFORE contacting OMEGA:  
1. Purchase Order number under which the product  
was PURCHASED,  
1. Purchase Order number to cover the COST  
of the repair,  
2. Model and serial number of the product under  
warranty, and  
3. Repair instructions and/or specific problems  
relative to the product.  
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.  
 
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Process Measurement and Control?  
OMEGA…Of Course!  
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Industrial Water & Wastewater Treatment  
pH, Conductivity & Dissolved Oxygen Instruments  
DPS-5C-1P-10/99,R0505-1C  
M3424/0505  
 

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