Omega Speaker Systems Stereo Amplifier PH 2720 PA User Manual

Users Guide  
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PH-2720-PA  
Preamplifier  
 
OMEGA PH-2720-PA pH/ORP Preamplifier Instructions  
SAFETY INSTRUCTIONS FOR IN-LINE ELECTRODE INSTALLATION  
1.  
2.  
3.  
4.  
Do not remove from pressurized lines.  
Do not exceed maximum temperature/pressure specifications.  
Wear safety goggles or face shield during installation/service.  
Do not alter product construction.  
Failure to follow safety instructions may result in severe personal injury!  
1. Wiring  
Preamplifier:  
PH-2720-PA  
Preamplifier:  
PH-2720-PA  
Silver (earth ground)  
Brown  
Blue  
Silver (earth ground)  
Brown  
Blue  
(mV Input)  
(Iso. Gnd)  
(V-)  
(mV Input)  
(Iso. Gnd)  
(T+)  
7
6
8
4
10  
ALARM  
2
ALARM  
1
pH  
2
12  
14  
Black  
Red  
Green  
White  
Red  
0
(V+)  
(T-)  
ENTER  
Green  
White  
(T+)  
(V+)  
Black  
(T-)  
OMEGA  
PHCN-5700  
OMEGA  
PHCN-5700  
(V-)  
pH  
ORP  
pH  
ORP  
Electrodes:  
PHE-3271  
PHE-2716  
Electrodes:  
ORE-2715  
ORE-2717  
Electrodes:  
ORE-2715  
ORE-2717  
Electrodes:  
PHE-3271  
PHE-2716  
Preamplifier:  
PH-2720-PA  
Preamplifier:  
PH-2720-PA  
Silver (earth ground)  
Silver (earth ground)  
Red  
Black  
Red  
Black  
(#10) V+  
(#11) V-  
N/C  
(#10) V+  
(#11) V-  
(#12) T+  
(#13) Ain  
(#14) ISO  
(#14) ISO  
pH CONTROLLER  
ORP CONTROLLER  
RLY  
RLY  
RLY  
RLY  
1
2
3
4
RLY  
RLY  
RLY  
RLY  
1
2
3
4
Green  
Green  
mV  
ORP  
mV  
pH  
ENTER  
CAL  
MOD  
ENTER  
CAL  
MOD  
White  
Brown  
Blue  
Brown  
White  
Blue  
N/C  
TEMP  
RELAY  
OUTPUT  
RELAY  
OUTPUT  
(#13) Ain  
(#14) ISO  
OMEGA  
PHCN-90  
OMEGA  
ORCN-90  
• Use X1 gain selection  
• Use X1 gain selection  
pH  
ORP  
Electrodes:  
PHE-3271  
PHE-2716  
Electrodes:  
ORE-2715  
ORE-2717  
Technical Notes:  
• Use 6-conductor shielded cable for cable extensions to 120 m (400 ft)  
• Shield must be maintained through cable splice  
2. Installation Fittings  
Type  
Description  
Type  
Description  
Plastic tees  
0.5 to 4 in.  
PVC or CPVC  
Carbon steel  
weld-on  
2 to 4 in, use 1-7/16 in. hole in pipe  
Remove insert before welding  
Mounts via glue-on fittings  
weldolets  
Installed by certified welder only  
Carbon steel  
threaded tees  
PVC glue-on  
saddles  
(O-ring not  
required)  
2 to 4 in., use 1-7/16 in. hole in pipe  
Align wedge arrows with saddle  
arrows during assembly.  
0.5 to 2 in.  
Mounts on threaded pipe ends  
Universal  
pipe adapter  
for large pipes  
For existing pipe fittings 2 in. and up  
External 1-1/4 inch NPT male threads  
Iron  
strap-on  
saddles  
2 to 4 in., use 1-7/16 in. hole in pipe  
Consult OMEGA for additional fitting information.  
 
3. Recommended Position  
Customer supplied:  
• 3/4 in. NPT threaded  
pipe (A)  
Customer supplied:  
• 3/4 in. NPT nipple (male)  
• J-box  
C.  
D.  
3/4 in. NPT OR  
ISO 7/1-Rc 3/4  
female threads  
• J-box (B)  
B.  
B.  
A.  
• Flex conduit (C)  
• Quick release pipe  
clamp (D)  
• flex conduit  
C.  
A.  
• Tank flange (E)  
0°  
E.  
2 in.  
min.  
In-Line  
Process  
pipe  
Open  
tanks  
Closed  
tanks  
• Vertical (0°) position optimum  
• 4 fps or less for max. performance and sensor life  
Caution: If liquid level is not constant, always ensure  
liquid contact with electrode tip  
4. Installation  
Submersible Applications  
In-line Applications  
2
1
2
1
Sealant  
Preamplifier  
Preamplifier  
Customer  
supplied  
pipe  
3/4 in. NPT or  
ISO 7/1-Rc 3/4  
A. O-ring lubricant  
recommended  
(factory applied)  
A. O-ring lubricant  
Sealant  
C.  
recommended  
B. Align  
marks  
B. Align  
marks  
C.  
Hand  
tighten  
only!  
(factory applied)  
PH-31542-TC Sensor Cap  
(purchased separately)  
Fitting  
inlet  
3
Fill with  
3 to 4 in.  
of sealant  
Attach 3/4 in. watertight pipe to the top of the preamplifier. Secure  
the threaded connection to prevent any leakage. For additional  
defense against possible accumulation of condensation at the back  
seal area of the sensor, fill the lower 3-4 inches (75-100 mm) of  
conduit or extension pipe with a flexible sealant such as silicone.  
 
5. Accessories  
Part no.  
Description  
Material  
PP  
Sensor  
cap  
PH-31542-TC  
CAUTION!  
FPP-1220-0021  
FPP-1224-0021  
FPP-1228-0021  
Sensor O-ring,  
2 required  
Viton®  
EPR  
Kalrez  
When replacing O-rings, apply O-ring lubricant to sensor O-rings  
prior to preamplifier/electrode assembly. Unlubricated O-rings  
may score the preamplifier sealing surface.  
6. Specifications  
PH-2720-PA pH/ORP Preamplifier  
PHE Series pH Electrodes - ORE Series ORP Electrodes  
Housing material:  
CPVC  
Compatible sensors: PHE-3271  
PHE-2716  
Flat Surface pH Electrode  
Bulb pH Electrode  
Flat Surface ORP Electrode  
Bulb ORP Electrode  
General Specifications  
Wetted parts:  
Sensor body:  
O-rings:  
ORE-2715  
CPVC  
Viton®  
ORE-2717  
Input Impedance:  
Operating temp.:  
Gain:  
>1011  
Electrode junction:  
Quality standard:  
Porous UHMW polyethylene  
CE  
0 to 80 °C  
X1 (unity)  
±4.5 to ±8 VDC, dual supply  
Input power:  
Maximum pressure/temperature ratings:  
7 bar (100 psi) max. @ 65 °C (149 °F)  
4 bar (58 psi) max. @ 85 °C (185 °F)  
Current consumption: <1 mA, dual supply  
Quality standard:  
CE  
BAR  
PSI  
7 100  
5
75  
50  
25  
3
2
Dimensions:  
167 212  
77 122  
25 50  
°F  
°C  
3/4 in. NPT  
100  
75  
female threads  
Std.15 ft/  
4.6 m cable  
SAFETY INSTRUCTIONS FOR IN-LINE ELEC-  
TRODE INSTALLATION  
1. Do not remove from pressurized lines.  
2. Do not exceed maximum temperature/pressure  
specifications.  
3.6 in./  
91 mm  
3. Do not install/service without following  
installation instructions (see sensor manual).  
4. Wear safety goggles and faceshield during  
installation/service.  
5. Do not alter product construction.  
6. Failure to follow safety instructions could result  
in severe personal injury!  
1.8 in./  
46 mm  
7. Preamplifier Troubleshooting  
Procedure:  
A. Install sensor adapter into preamplifier  
Simulator  
Actual displayed  
mV  
________________________  
________________________  
________________________  
________________________  
B. With preamplifier and instrument connected, simulate pH 4, 7, and  
10 and record displayed mV readings (right) and approximate  
preamplifier response time between simulations.  
Input  
4.00, +177 mV  
7.00, 0 mV  
C. Refer to table on next page for preamplifier troubleshooting tips.  
10.00, -177 mV  
Preamplfier response time:  
 
With simulator  
connected  
Error Condition  
Possible Cause  
Possible Remedy  
A) mV output stuck at  
zero  
B) mV output erratic  
C) mV output stuck at  
1.4 VDC  
A) Shorted input signal  
B) Faulty preamplifier or wiring  
C) Faulty preamplifier  
A) Check preamplifier cable connections and shielding.  
B) Verify preamplifier shield connections. Verify cable shield  
wire has been maintained through each cable splice.  
C) Replace preamplifier  
Ok with  
A) mV output stuck  
near zero  
B) mV output erratic  
C) Output stuck at  
1.4 VDC  
A) Cracked electrode glass  
B1) Poor contact between  
electrode and preamplifier  
connectors  
A) Replace electrode  
B1) Check contacts between electrode and preamplifier.  
Contacts must be clean and dry.  
B2) Clean electrode, see electrode manual  
B3) Isolate electrode in test beaker. If output is stable, ground  
loops may exist causing erratic behavior; isolate instrument  
outputs (i.e. 4 to 20 mA, 0 to 5 VDC).  
C) Replace preamplifier  
simulator  
connected but  
fails with  
electrode  
B2) Fouled electrode  
reference or aged electrode  
B3) Ground loop  
C) Faulty preamplifier  
8. Electrode Maintenance and Cleaning  
8.1 Maintenance  
Hard coatings: can be chemically removed. Always use the least  
harsh chemical which will remove the contaminant within two (2)  
minutes without attacking the materials of construction. e.g. calcium  
carbonate may be removed with a 5% HCL (muriatic acid) solution.  
Variables can affect long term pH or ORP electrode life. For this  
reason, a maintenance log is recommended for trend analysis. When  
storing boxed sensors, lay the sensor flat to maximize hydration of the  
glass surface. Keep the glass surface wet at all times. Soak the sensor  
tip in pH 4.0 buffer during system maintenance intervals. In-line  
applications should be plumbed with a depression (trap) which ensures  
liquid is maintained around the sensor tip. If sensor dehydration has  
occurred, soak the sensor tip in pH 4 buffer for 24 to 48 hours, then  
visually inspect the electrode for surface cracks, swelling, or  
discoloration.  
Oily or Organic Coatings: can be removed with detergents or an  
appropriate solvent that does not attack the materials of  
construction e.g. isopropyl alcohol may be used but acetone must  
be avoided to prevent damage to the CPVC sensor body.  
ORP electrode surface (platinum rod): can be gently sanded with  
600 grit wet and dry silicone or carbide sandpaper, jewelers  
rouge, crocus cloth, or very fine steel wool.  
8.2 Cleaning  
Cleaning techniques vary depending on the type of coating present on  
the glass electrode surface or reference junction.  
Soft coatings: can be removed by vigorous stirring, or with  
directed spray of an applicable detergent or solvent onto the glass  
electrode surface. Chlorine bleach or mild detergent may be used  
to remove soft coatings. Always rinse electrode tip in clean water  
after cleaning.  
WARNING!  
When using chemicals or solvents care should be taken and  
appropriate eye, face, hand, body, and/or respiratory  
protection should be used.  
 
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 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 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 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 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.  
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 2000 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.  
 
Where Do I Find Everything I Need for  
Process Measurement and Control?  
OMEGA…Of Course!  
TEMPERATURE  
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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  
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Transducers & Strain Gages  
Load Cells & Pressure Gages  
Displacement Transducers  
Instrumentation & Accessories  
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Rotameters, Gas Mass Flowmeters & Flow Computers  
Air Velocity Indicators  
Turbine/Paddlewheel Systems  
Totalizers & Batch Controllers  
pH/CONDUCTIVITY  
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pH Electrodes, Testers & Accessories  
Benchtop/Laboratory Meters  
Controllers, Calibrators, Simulators & Pumps  
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DATA ACQUISITION  
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Communications-Based Acquisition Systems  
Plug-in Cards for Apple, IBM & Compatibles  
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Recorders, Printers & Plotters  
HEATERS  
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Heating Cable  
Cartridge & Strip Heaters  
Immersion & Band Heaters  
Flexible Heaters  
Laboratory Heaters  
ENVIRONMENTAL  
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Metering & Control Instrumentation  
Refractometers  
Pumps & Tubing  
Air, Soil & Water Monitors  
Industrial Water & Wastewater Treatment  
pH, Conductivity & Dissolved Oxygen Instruments  
6-2720.090-OM/(B-11/01)  
M-2035/1101  
 

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