EUTECH INSTRUMENTS ALPHA PH DIFFERENTIAL PROBE Instruction Manual Download Page 19 | Manualshive

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EUTECH INSTRUMENTS ALPHA PH DIFFERENTIAL PROBE Instruction Manual Download Page 19

Instruction

manuals

ECFP21A1A1

15

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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Summary of Contents for ALPHA PH DIFFERENTIAL PROBE

Page 1: ...Technology Made Easy INSTRUCTION MANUAL ECFP21A1A1 Differential pH Sensor 1 Inch NPT Mounting Threads 68X216866 Rev 0 10 04 ...

Page 2: ...rized 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 reser...

Page 3: ...ed 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 ...

Page 4: ... 1 PIPE TEE MOUNTING 7 3 2 2 IMMERSION MOUNTING 10 4 PH SENSOR MAINTENANCE 12 4 1 CLEANING THE PH SENSOR HEAD 12 4 2 PH SENSOR REFURBISHMENT REPLACING THE SALT BRIDGE AND REFERENCE SOLUTION 13 4 3 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...

Page 5: ... 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 installat...

Page 6: ... and cabling Observing the prescribed environmental and operational conditions Observing chemical compatibility with all wetted materials 1 3 Safety Instructions The ECFP21A1A1 1 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 I...

Page 7: ...rence 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 sensor body has 1 inch NPT threads for the following mounting options Standard 1 inch NPT pipe tee insertion Immersion mounting assembly Salt bridg...

Page 8: ...d Red Wire pH Electrode Active Measure Green Wire Reference Electrode Yellow Wire Temperature NTC 300 Drain Shield Earth 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 sen...

Page 9: ... 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 purp...

Page 10: ...rage 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 adeq...

Page 11: ...ary 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 Optimal electrode placement ...

Page 12: ...tioning 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 Figure 3 4 Short Nose Sensor in Schedule 80 PVC Tee Minimum flow restriction must be pressurized to avoid air pockets Dimensions IN mm ...

Page 13: ...at 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...

Page 14: ...mmersion Mounting For immersion mounting applications the sensor is connected to a 1 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 ...

Page 15: ...e 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 measur...

Page 16: ...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...

Page 17: ...y fill the reservoir with reference solution so the solution just covers the reference O ring 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 instructio...

Page 18: ...tly 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 perform...

Page 19: ...ensor 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 Senso...

Page 20: ...otected PEEK Salt Bridge O ring included Flat PEEK 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 ...

Page 21: ...Instruction manuals ECFP21A1A1 17 5 1 3 Mounting Hardware Replacements Immersion Mounting Assembly Description Junction box 1 PVC pipe 1 PVC NPT coupling ...

Page 22: ...ase 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 Operat...

Page 23: ...ude 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...

Page 24: ...ontact your nearest distributor or visit our website listed below Eutech Instruments Pte Ltd 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 Distributed by ...

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