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INSTRUCTION MANUAL
ECFP21A1A1
Differential pH Sensor
1 ½ Inch NPT Mounting Threads
Technolo
adeEa
68X216866 Rev 0 10/04
Preface
This instruction manual serves to explain the use of the ECFP21A1A1 1½ inch pH sensor and is written to
cover as many applications as possible. Please do not hesitate to contact Eutech Instruments or an
authorized representative with questions or concerns.
The information presented in this instruction manual is subject to change without notice as improvements are
made, and does not represent any commitment whatsoever on the part of Eutech Instruments.
Eutech Instruments cannot accept any responsibility for damage or malfunction of the sensor due to
improper use.
Eutech Instruments Pte Ltd.
All rights reserved
Rev 0 10/04
Safety Information
The ECFP21A1A1 1½ inch pH sensor shall be installed and operated only in the manner specified. Only a
skilled, trained or authorized person should carry out installation, setup and operation of the sensor system.
Before using the sensor, make sure that the sensor cable is connected as specified. Failure to do so may result
in permanent damage to the sensor or controller.
Protection against electric shock will be achieved only by observance of the corresponding installation rules.
TABLE OF CONTENTS
1. INTRODUCTION................................................................................................................................... 1
1.1. G
1.2. I
ENERAL INFORMATION.................................................................................................................... 1
NTENDED USE ................................................................................................................................... 2
2. PRODUCT DESCRIPTION.................................................................................................................. 3
2.1. S
2.2. S
ENSOR DESCRIPTION........................................................................................................................ 3
PECIFICATIONS................................................................................................................................. 4
3. INSTALLATION....................................................................................................................................5
3.1. W
3.2. M
3.2.1. P
3.2.2. I
IRING.............................................................................................................................................. 5
OUNTING HARDWARE..................................................................................................................... 6
IPE TEE MOUNTING...................................................................................................................... 7
MMERSION MOUNTING ............................................................................................................... 10
4. PH SENSOR MAINTENANCE .......................................................................................................... 12
4.1. CLEANING THE PH SENSOR HEAD....................................................................................................12
4.2.
4.3.
PH SENSOR REFURBISHMENT - REPLACING THE SALT BRIDGE AND REFERENCE SOLUTION............ 13
PH SENSOR TROUBLESHOOTING ...................................................................................................... 14
5 PH SENSOR SPARE PARTS AND ACCESSORIES.......................................................................16
5.1.1 Reference Cell Replacements.................................................................................................. 16
5.1.2 pH Buffer Standards ............................................................................................................... 16
5.1.3 Mounting Hardware Replacements ........................................................................................ 17
6 WARRANTY......................................................................................................................................... 18
7 RETURN OF ITEMS...........................................................................................................................19
Instruction manuals ECFP21A1A1
1. INTRODUCTION
1.1. General Information
Thank you for purchasing the ECFP21A1A1 Differential pH Sensor. This industrial sensor has many
enhanced features that offer superior performance in process applications:
• Differential pH measurement technology minimizes susceptibility to ground loops.
• A built in pre-amplifier eliminates high impedance wiring problems.
• A replaceable heavy-duty quad junction salt bridge for extended life in severe applications.
• A large reference reservoir filled with buffered solution minimizes the effects of dilution and extends
the life of the reference electrode.
• Easily refurbished in the field by replacing the salt bridge and reference solution, extending the life of
the sensor.
The product is designed for continuous use in industrial process applications and complies with safety
regulations currently in force. Improper use could lead to hazards for the user or a third-party, and/or adverse
effects to the plant or other equipment.
Eutech Instruments does not accept any liability for damage that may arise if information in this
manual is not followed. Therefore, the operating instructions and specifications must be read and
understood by all persons involved in installation and operation of this equipment.
This manual identifies safety instructions and additional information by means of the following symbols:
This symbol draws attention to safety instructions and warnings of potential danger,
which if neglected, could result in injury to persons and/or damage to property.
This symbol identifies additional information and instructions, which if neglected, could
lead to inefficient operation and possible loss of production.
It is recommended that this manual be made accessible to everyone who may need it as a reference.
Please contact Eutech Instruments or an authorized representative with any questions.
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Instruction manuals ECFP21A1A1
1.2. Intended use
ECFP21A1A1 1½ inch pH sensor is designed to continuously measure pH and temperature in aqueous
solutions in accordance with the technical product specifications in Section 2.2 of this manual.
Any other use, or use not mentioned here, that is incompatible with the technical specifications is deemed
inappropriate. The operator is solely responsible for any damage arising from such use.
Other prerequisites for appropriate use include:
• Observing the instructions, notes and requirements set out in this instruction manual.
• Observing all local safety regulations.
• Observing all warnings and cautions in the documentation regarding all products used in this
measurement system, including the pH sensor, mounting hardware, analyzer electronics and
cabling.
• Observing the prescribed environmental and operational conditions.
• Observing chemical compatibility with all wetted materials.
1.3. Safety Instructions
The ECFP21A1A1 1½ inch pH sensor should be installed and operated only by
personnel familiar with the sensor and qualified for such work.
A defective sensor should be returned to Eutech Instruments for repair or
replacement. Contact Eutech Instruments to obtain a Return Goods Authorization
(RGA) number.
No modifications to the ECFP21A1A1 1½ inch pH sensor are allowed. The
manufacturer/supplier accepts no responsibility for damage caused by unauthorized
modifications. The risk is borne entirely by the user.
1.4. Removal from Service / Correct Disposal of the Sensor
Removal from Service
• Disconnect the cable wiring from the controller terminal block.
• Remove the sensor from the mounting hardware.
Correct Disposal of Unit
• When the sensor is taken out of service, observe the local environmental regulations for correct
disposal.
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Instruction manuals ECFP21A1A1
2. PRODUCT DESCRIPTION
2.1. Sensor Description
The ECFP21A1A1 1½ inch pH sensor uses a differential measurement technique to maximize lifetime in
continuous industrial applications. The ground rod and encapsulated preamplifier construction reduce the
effects of ground loops and allow the pH signals to be transmitted up to 3,000 feet. A replaceable heavyduty quad junction salt bridge makes it simple to refurbish the sensor when necessary. The large reference
reservoir filled with buffered solution minimizes the effects of dilution and extends the life of the reference
electrode. The wires in the sensor cable are color coded to allow for quick and easy installation into the
Alpha pH2000D Controller.
The wires in the sensor cable are color coded to match the
terminal connection within the Alpha pH2000D Controller.
Figure 2.1: 1½ inch pH Sensor
with Salt Bridge Options
Figure 2.2: pH sensor hook-up
The sensor body has 1½ inch NPT threads for the following
mounting options:
¾ Standard 1½ inch NPT pipe tee insertion.
¾ Immersion mounting assembly.
Salt bridges come in two styles:
¾ Protected for standard applications.
¾ Flat for sanitary applications.
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Instruction manuals ECFP21A1A1
2.2. Specifications
Wetted Materials……………………………. Sensor Body - CPVC
Salt Bridge Junctions - Kynar®
pH Electrode - General glass
Ground Rod - 316 Stainless Steel
O-Ring Seals - Viton®
(Consult factory for customized material construction)
Operating Temperature……………………..
Maximum Pressure………………………….
Maximum Flow Rate………………………... 3 m/sec (10 ft/sec)
Measuring Range…………………………… 0 to 14 pH
Resolution……………………………………. 0.01 pH
Standard Sensor Cable Length……………. 3 m (10 ft)
Cable Wire Colors…………………………... White Wire (-5V)
Maximum Transmission Distance…………. 914 m (3,000 ft)
The sensor will arrive with a protective cap that keeps the sensor hydrated.
For short-term storage, put several drops of Eutech Instruments’ storage solution on the absorbent
material in the protective cap and replace the cap on the sensor. This keeps the process electrode
and salt bridge moist.
For extended storage, repeat the above short-term storage procedure every 2 to 4 weeks,
depending on the surrounding environmental conditions.
Make sure all wetted materials are compatible with process chemicals at operating temperatures
and pressures.
-5°C to 95°C (23°F to 203°F)
100 psi @ 100°C (100 psi @ 212°F)
Black Wire (Ground)
Red Wire (pH Electrode/Active(Measure))
Green Wire (Reference Electrode)
Yellow Wire (Temperature/NTC 300)
Drain/Shield (Earth)
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Instruction manuals ECFP21A1A1
3. INSTALLATION
3.1. Wiring
Figure 3.1: pH Sensor Hook Up
There are two different methods for electrical connection between the sensor and the pH controller; either direct
or through a junction box.
3.1.1. Direct Connection
1. Use a watertight cord grip to insert the sensor cable into the Alpha pH2000D Controller. Conduit holes
are found on the bottom of the Alpha pH2000D controller for this purpose.
2. Connect the sensor wires to the Alpha pH2000D controller as outlined in the controller manual.
3.1.2. Using a Junction Box (Indirect Connection)
1. Use a watertight cord grip to insert the sensor cable and the interconnect cable into the junction box
that has a terminal strip designed to make the proper connections.
2. Connect both the sensor cable wires and the interconnect wires to the terminal strip.
3. Use a watertight cord grip to insert the sensor cable into the Alpha pH2000D Controller.
Conduit holes are found on the bottom of the Alpha pH2000D controller for this purpose.
4. Connect the sensor wires to the Alpha pH2000D controller as outlined in the controller manual.
Be sure that the wire colors of the sensor cable match those of the interconnect cable on
either side of the terminal strip.
Route the interconnect cable through metal conduit to minimize electrical noise that may
interfere with the sensor signal.
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Instruction manuals ECFP21A1A1
3.2. Mounting Hardware
Eutech Instruments’ short nose sensor (Fig 3.2) has insertion threads located closer to the sensing
elements and is recommended for short branch tees (typically metal tees and SCH 40 plastic tees).
Save the protective cap and use it to
keep electrodes moist whenever the
sensor is removed from service.
When taking a sensor out of storage,
soak the sensor in a pH 7 buffer
solution for 30 minutes before
calibration.
If the sensor does not calibrate, refer
to Section 4 to review maintenance,
refurbishment and troubleshooting
options.
The sensor should be positioned at
least 15° up from horizontal. This
will insure that entrained air does not
form a pocket around the sensor
head.
DO NOT USE PIPE SEALANT.
Pipe sealants may not provide
adequate sealing or may react with
different plastic materials. Use
thread tape.
DO NOT OVER TIGHTEN!
Maximum torque: 66.4 lbs⋅inch (1.13 N⋅m)
Dimensions: IN (mm)
Figure 3.2: Short Nose Sensor Body
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Instruction manuals ECFP21A1A1
3.2.1. Pipe Tee Mounting
Eutech Instruments’ distinct body type for its 1½ inch differential pH sensor ensure optimal
positioning of the active pH sensor electrode in the process flow. Normally available pipe tees
vary widely in construction dimensions. CPVC pipe tees are most generally available with
schedule 80 walls. Stainless steel tees have thinner walls that change the final position of the
sensor.
Common mounting arrangements are shown for the short nose pH sensors.
Recommended Tee Mounting Configurations
Figure 3.3: Short Nose Sensor Mounted
in Steel Tee or Schedule 40 PVC Tee
Dimensions: IN (mm)
Optimal electrode placement with
minimum flow restriction
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Instruction manuals ECFP21A1A1
Acceptable Tee Mounting Configuration for Specific Applications
The short nose sensor bodies can be installed in a variety of tee pipes but optimal electrode positioning
may not be maintained. If the sensor body does not extend far enough it may be possible for an air
pocket to form. Alternatively, if the sensor body extends past the midway point it may restrict flow. As
long as precautions are taken these setups can be used.
Dimensions: IN (mm)
Figure 3.4: Short Nose Sensor in Schedule
80 PVC Tee
Minimum flow restriction must be
pressurized to avoid air pockets
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Instruction manuals ECFP21A1A1
Detailed Pipe Tee Installation Instructions
1. Wiring:
a. Route the cable – either through conduit or on a cable tray.
b. Insert the sensor cable into the Alpha pH2000D controller through a watertight
cord grip. Conduit holes are provided for the cord grip on the bottom of the Alpha
pH2000D controller.
c. Connect the sensor wires into the Alpha pH2000D sensor terminal block as shown
in the Alpha pH2000D manual.
2. Calibrate:
a. Power the Alpha pH2000D controller.
b. Remove the protective cap from the sensor head and make sure moisture is
present and that the salt bridge has not dried out. If the protective cap is dry, the
sensor should be hydrated in tap water for at least 1 hour prior to calibration.
c. Calibrate the pH sensor as explained in the Alpha pH2000D manual. It is
recommended to use a 2-point buffer calibration on installation of the sensor.
Subsequent calibrations should be scheduled based on process demands.
d. If measurement response time is slow or if the sensor will not calibrate, refer to
Section 4 for maintenance, refurbishment and troubleshooting suggestions.
3. Mount:
a. Apply Teflon
®
tape to the sensor body threads.
b. Insert the sensor into the tee and slowly turn clockwise until secure. Tighten the
sensor with a wrench until snug to prevent leaking. Be sure the pipe remains full
when the sensors are installed.
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Instruction manuals ECFP21A1A1
3.2.2. Immersion Mounting
For immersion mounting applications the sensor is connected to a 1½ inch extension pipe to protect
the cable from damage and to reduce the possibility of leaks that may damage the sensor.
Figure 3.5: Immersion mounting assembly
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Instruction manuals ECFP21A1A1
Detailed Insertion Mount Installation Instructions
1. Wiring:
a. Route the sensor cable through the 1.5 inch extension pipe.
b. Apply Teflon® tape to the sensor threads.
c. Attach the sensor to the 1.5 inch NPT coupling by turning the sensor in a
clockwise direction until secure.
d. Either route the cable directly to the Alpha pH2000D or splice the wires in a
junction box and use an extension cable.
e. Insert the cable into the Alpha pH2000D controller through a watertight cord grip.
Conduit holes are provided for the cord grip on the bottom of the Alpha pH2000D
controller.
f. Connect the sensor wires into the Alpha pH2000D sensor terminal block as shown
in the Alpha pH2000D manual.
2. Calibrate:
a. Power the Alpha pH2000D controller.
b. Remove the protective cap from the sensor head and make sure moisture is
present and that the salt bridge has not dried out. If the protective cap is dry, the
sensor should be hydrated in tap water for at least 1 hour prior to calibration.
c. Calibrate the pH sensor as explained in the Alpha pH2000D manual. It is
recommended to use a 2-point buffer calibration on installation of the sensor.
Subsequent calibrations should be scheduled based on process demands.
d. If measurement response time is slow or if the sensor will not calibrate, refer to
Section 4 for maintenance, refurbishment and troubleshooting suggestions.
3. Mount:
a. Secure the pipe assembly so that the sensor is fully immersed in the process.
Be sure that the wire colors of the sensor cable match those of the
interconnect cable on either side of the terminal strip.
Do not route the interconnect cable conduit where there are AC or DC
power cables which create electrical noise that may interfere with the
sensor signal.
Route the interconnect cable through metal conduit to minimize electrical
noise that may interfere with the sensor signal.
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Instruction manuals ECFP21A1A1
4. pH SENSOR MAINTENANCE
4.1. Cleaning the pH Sensor Head
4.1.1. In order to maintain an accurate measurement value, the sensor will need occasional maintenance.
The maintenance interval will be dictated by the process in which it is installed. The harsher the
process, the more often the sensor will require maintenance. Regular maintenance will yield a longer
4.1.2. The sensor cleaning procedure is as follows:
sensor life.
4.1.2.1. Remove sensor from service and rinse or spray it with warm water to remove heavy deposits.
4.1.2.2. Soak the sensor in a container of hot detergent water for one hour. Do not use detergents that
®
contain oily skin softeners like aloe or lanolin that can coat the glass electrode. Alconox
and
Dawn™ dishwashing liquid work well.
4.1.2.3. Use a soft-bristled brush, such as a soft toothbrush, and hot detergent water to scrub the entire
electrode end of the sensor, being careful not to scratch or break the glass electrode.
4.1.2.4. Rinse the electrode end with clean warm water.
4.1.2.5. If deposits are still present on glass electrode repeat steps 2 and 3. In the case of lime or other
mineral deposits a weak solution (about 0.1 M) of hydrochloric acid may be used. In some cases, a
dilute solution (about 10:1) of water and chlorine bleach or a solution of water and EDTA may also
work. Stubborn oil or grease deposits may require cleaning with a solvent such as acetone or
alcohol. Protein deposits may be cleaned with a pepsin-based cleaning solution. Bacterial or mold
growth may be removed with dilute chlorine bleach.
Caution: Ensure that dangerous chemical reactions will not occur between process
deposits and cleaning solutions. Compounds of cyanide and hydrochloric acid will react
and pose health risks. Cyanide is often used in electroplating and in gold refining. If in
doubt about potential chemical reactions, check with a chemist before cleaning.
4.1.3. Before returning the sensor to service, allow it to soak in water or buffer at ambient temperature for
about an hour to restabilize the pH electrode and the salt bridge.
4.1.4. After cleaning the sensor, calibrate sensor per instructions in the Alpha pH2000D controller manual.
4.1.5. Reinstall sensor in process.
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Instruction manuals ECFP21A1A1
4.2. pH Sensor Refurbishment - Replacing the Salt Bridge and Reference Solution
4.2.1. If the sensor head has been cleaned
(see section 4.1.2) and calibration cannot
be achieved, replace the salt bridge and
reference solution.
4.2.2. Hold the sensor firmly with the electrode
tip facing upwards. Remove the existing
salt bridge by using a 15/16 wrench
(24mm) and turning it counterclockwise.
Dispose of the salt bridge using an
approved method.
4.2.3. Pour out the old reference solution.
Rinse the reservoir with distilled or deionized water.
4.2.4. Slowly fill the reservoir with reference
solution so the solution just covers the
reference O-ring.
Do not over fill. Overfilling will
lead to excessive pressures that
will affect the junction potentials of
the reference.
4.2.5. Slowly screw the new salt bridge clockwise onto
the sensor head until secure. Tighten the salt
bridge with a 15/16 wrench (24mm) until snug.
Do not over tighten.
Maximum torque: 10 lbs⋅in (1.13 N⋅m)
4.2.6. After replacing the salt bridge and reference
solution, calibrate the sensor according to the
instructions in the Alpha pH2000D controller
manual.
If after cleaning and refurbishment sensors still have slow responses, low measurement
slopes or are seriously abraded or scratched they must be replaced.
Figure 4.1: Replacing the salt bridge
and reference solution
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Instruction manuals ECFP21A1A1
4.3. pH Sensor Troubleshooting
General Inspection
If the sensor is not providing reasonable signals to the analyzer, check the following:
1. Inspect the integrity of the glass electrodes. If the electrode is broken, replace the sensor.
2. Inspect the integrity of the salt bridge junctions. Be sure that they are clean and moist. If the salt bridge has
been allowed to dry out it may be necessary to replace the salt bridge and filling solution.
3. Inspect the sensor cable for damage to the outer jacket. Any cuts or kinks may damage signal
connections.
4. Inspect terminal block connections to be sure wires are not corroded or loose.
5. Make sure all sensor wires are connected to the correct places on the analyzer terminal block. Depending
on the analyzer, some terminal block jumpers may be required and it is common to put those jumpers in the
wrong place.
6. The sensor electrodes should be immersed in a solution of known pH.
7. Establish that the analyzer electronics are working correctly by verifying operation with another sensor.
Note: Any new sensor that has been in storage for more than a few days should be soaked in tap water or a
solution of known pH for at least 30 minutes to before reviewing the span and offset performance.
Note: The electrodes of any pH sensor in storage must be kept moist at all times. Protective caps should be
filled with storage solution for best performance. The protective cap should be placed securely over the
sensor head.
If the sensor passes the general inspection, there are four basic tests that can verify the temperature
measurement, the pH offset, the pH Span and the pH span on sensor power. If the sensor passes these tests
it should be ready for service.
Temperature Span
Disconnect the BLACK and YELLOW sensor wires from the analyzer. Use an ohmmeter to measure the
resistance between the BLACK and YELLOW wires. The meter should measure a resistance corresponding
to the sensor temperature as outlined in the following table.
Sensor Temperature 5C 15C 25C 35C 45C
Thermistor Resistance 630 Ω 430 Ω 300 Ω 215 Ω 155 Ω
If the measured resistance is within 10 to 20 ohms of the expected value, the element should be satisfactory.
If not, please consult the factory.
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Instruction manuals ECFP21A1A1
pH Offset Test
1. Disconnect the RED and GREEN sensor wires from the analyzer terminal block while leaving the other
wires connected. Connect the (+) lead of a millivolt meter to the RED wire and the (-) lead of the millivolt
meter to the GREEN wire.
2. Put the sensor in 7 pH buffer. Stir the sensor for 10 to 15 seconds and then allow the sensor to stabilize in
solution for about 2 minutes. The meter should read 0.0mV +/- 50 mV. If the reading is higher or lower
than specified, replace the salt bridge and filling solution and try again. If on the second attempt the offset
does not meet specification, replace the sensor.
pH Span Test
If the RED and GREEN wires have already been disconnected to run the offset test, skip step 1.
1. Disconnect the RED and GREEN sensor wires from the analyzer terminal block while leaving the other
wires connected. Connect the (+) lead of a millivolt meter to the RED wire and the (-) lead of the millivolt
meter to the GREEN wire.
2. Rinse the sensor in clean water. Put the sensor in 4 pH buffer. Stir the sensor for 10 to 15 seconds and
then allow the sensor to stabilize in solution for about 2 minutes. The meter should read a change of at
least 150mV from the offset reading. For example, if the offset is +20mV the reading in 4 pH buffer should
be at least 170mV.
After testing offset and span, the RED and GREEN wires should be reconnected to the analyzer terminal
block.
Sensor Power Test
If the sensor does not respond with any reasonable millivolt signal in the offset and span tests, it may be
worthwhile to verify that power is being supplied to the sensor from the analyzer. To do this, connect a
voltmeter from the BLACK lead to the WHITE lead (It is not necessary to disconnect the wires from the
terminal block). The meter should read –5 VDC +/- 0.3 VDC. If the voltage is low, disconnect the white wire
from the terminal block and measure the voltage on the terminal block. If the voltage comes back into
specification there is a defect in the sensor that is loading down the analyzer. If the voltage remains low then
the analyzer may be defective.
If the sensor passes the temperature, offset, span and power tests but the analyzer is not displaying the
correct values, the analyzer may be defective.
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Instruction manuals ECFP21A1A1
5 pH SENSOR SPARE PARTS and ACCESSORIES
5.1.1 Reference Cell Replacements
Description
• Reference Cell Solution (500 ml)
• Protected PEEK
• Flat PEEK
®
Salt Bridge (O-ring included)
®
Salt Bridge (O-ring included)
• Protected CPVC Salt Bridge (O-ring included)
• Flat CPVC Salt Bridge (O-ring included)
• pH Sensor Storage Solution
• Protective Cap
5.1.2 pH Buffer Standards
Description
• EC-BU-4BT pH 4 Buffer Standard (480 ml)
• EC-BU-7BT pH 7 Buffer Standard (480 ml)
• EC-BU-10BT pH 10 Buffer Standard (480 ml)
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Instruction manuals ECFP21A1A1
5.1.3 Mounting Hardware Replacements
Immersion Mounting Assembly
Description
• Junction box
• 1½” PVC pipe
• 1½” PVC NPT coupling
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Instruction manuals ECFP21A1A1
6 WARRANTY
The ECFP21A1A1 1½ inch pH sensor is supplied with a 6 month warranty against manufacturing defects.
If repair or adjustment is necessary and has not been the result of abuse or misuse within the designated period, please
return – freight pre-paid – and correction will be made without charge. Eutech Instruments will determine if the product
problem is due to deviations or customer misuse.
Out of warranty products will be repaired on a charged basis.
Exclusions
The warranty on your product shall not apply to defects resulting from:
• Improper or inadequate maintenance by customer
• Unauthorized modification or misuse
• Operation outside of the environment specifications of the products
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Instruction manuals ECFP21A1A1
7 RETURN OF ITEMS
Authorization must be obtained from our Customer Service Department or authorized distributor before returning items
for any reason. A “Return Goods Authorization” (RGA) form is available through our Authorized Distributor. Please
include data regarding the reason the items are to be returned. For your protection, items must be carefully packed to
prevent damage in shipment and insured against possible damage or loss. Eutech Instruments will not be responsible
for damage resulting from careless or insufficient packing. A restocking charge will be made on all unauthorized returns.
NOTE:
Eutech Instruments Pte Ltd reserves the right to make improvements in design, construction and appearance of products
without notice.
19
For more information on Eutech Instruments products, cont act your nearest distributor or visit our website listed below:
Eutech Instruments Pte Ltd
Distributed by:
Blk 55, Ayer Rajah Crescent,
#04-16/24 Singapore 139949
Tel: (65) 6778 6876
Fax: (65) 6773 0836
E-mail: marketing@eutechinst.com
Web-site:
www.eutechinst.com
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