Signet 2724 Series DryLoc pH and ORP Electrodes
Contents
1. 0 to 14 pH ORP 2000 mV e Process connection 3 in NPT or ISO 7 1 R threads 3 2726 LC Low Conductivity fluids not less than 20 uS cm or Signet flow fittings 3 2726 HF For applications where Hydrofluoric acid will attack standard pH glass in levels of pH 6 and below or in situations Wetted Materials where process upsets may temporarily drop to these pH levels e ph PPS glass UHMW PE FPM e ORP PPS glass UHMW PE FPM Standards and Approvals Platinum e Manufactured under ISO 9001 2000 for Quality and ISO 14001 2004 for Environmental Management Recommended storage temperature e The best storage temperature for the 272X pH and ORP electrodes is 0 C to 50 C 32 F to 122 F e The electrode glass will be shattered if shipped or stored at temperatures below 0 C 32 F e The performance life of the electrode will be shortened if stored DO NOT FREEZE at temperatures above 50 C 122 F 1 2 Dimensions 1 3 Operating Temperature and Pressure Specifications Pressure vs Temperature Operational Graph bar si 2724 2726 pH Electrode 2725 ORP Electrode p 2726 HF pH Electrode 2726 LC pH Electrode 6 89 100 6 80 109 mm 4 3 in Threads 3 4 in NPT or ISO 7 1 R 4 60 2726 HF pH Electrode Minimum Temperature _ gt NO D O 2726 HF pH Electrode 2726 LC pH Electrode Maximum Temperature 44 45 mm 20 1 752. at all times 5 The user must supply the following hardware to complete a submersible installation e in NPT threaded pipe or conduit e Wiring junction box e Pipe clamps quick release type recommended e Tank flange for closed tanks f Fill with 3 to 4in of sealant Closed tanks Signet 272X Series pH and ORP Electrodes GF 4 pH System Calibration There are two functions in a pH electrode that require the system to be calibrated 4 1 Temperature e The temperature output of the electrode from a 3K Balco or PT1000 RTD must be calibrated only once when a new electrode is installed It does not need to be repeated e Because the temperature measurement has a significant influence on the electrochemical measurement the temperature output in new pH electrodes should always be calibrated before the pH mV calibration pH error due to temperature changes in fluid ras os oro Le as ons oa 008 0 06 008 o 008 oo atetateteleteyetel ite a5 ors om2 oo oo oos o 00s coe ooo or 015 Tas os oz ove or oo o oo or ove om os 55 om ose oar or oo o oo ove 027 oss 045 Table 1 As the pH value moves away from neutral 7 pH or the temperature moves away from 25 C the electrochemical output is affected Example At pH 5 the millivolt output of the electrode is not affected if the temperature is at 25 C The electrode output will be shifted
3. in 53 34 mm C 10 O 10 20 30 40 50 60 70 80 90 100 F 14 32 50 86 122 176 212 2724 2726 2725 6 89 bar 10 C to 65 C linearly derated to 4 bar 85 C 100 psi 14 F to 149 F linearly derated to 58 psi 185 F 2726 LC 6 89 bar 10 C to 65 C linearly derated to 4 bar 80 C 100 psi 14 F to 149 F linearly derated to 58 psi 176 F 2726 HF 6 89 bar 10 C to 65 C linearly derated to 4 bar 80 C 100 psi 50 F to 149 F linearly derated to 58 psi 176 F 2 0 In Line Installations 2 1 In Line Installation Tips e pH and ORP electrodes respond best in moving fluids 3 2726 LC Low conductivity electrodes must not be used in flow streams exceeding 1 m s 3 ft s velocity e Use the in threads on the electrode body to install the electrode into reducing tee fittings The fitting must place the electrode in the flow but must not bottom out in the pipe e The electrode must be mounted in an upright position Do not mount horizontally or inverted e Select a Signet installation fitting for convenience e Inspect threads to insure integrity Do not install an electrode with damaged threads e Use piping installation hardware with smooth well finished threads to facilitate the installation e Apply PTFE tape to the process connection threads in accordance with industry standards e If necessary the pipe should be plumbed with a depression trap so liquid is maintained
4. 01 559 159 001 560 159 001 561 159 001 562 Code 159 000 744 159 000 745 159 000 746 159 000 842 159 000 939 159 000 940 159 000 941 159 000 942 159 001 367 159 001 368 159 001 369 159 001 370 159 000 762 159 000 764 198 864 403 159 001 581 159 001 582 159 001 583 3 2724 090 Rev B 06 08 English Description Electrode pH flat PT1000 in NPT Electrode pH flat PT1000 ISO 7 1 R Electrode pH flat 3K Balco in NPT Electrode pH flat 3K Balco ISO 7 1 R Electrode pH bulb PT1000 in NPT Electrode pH bulb PT1000 ISO 7 1 R Electrode pH bulb 3K Balco in NPT Electrode pH bulb 3K Balco ISO 7 1 R Electrode pH HF resistant bulb PT1000 in NPT Electrode pH HF resistant bulb PT1000 ISO 7 1 R Electrode pH HF resistant bulb 3K Balco in NPT Electrode pH HF resistant bulb 3K Balco ISO 7 1 R Electrode pH bulb Low Cond PT1000 in NPT Electrode pH bulb Low Cond PT1000 ISO 7 1 R Electrode pH bulb Low Cond 3K Balco in NPT Electrode pH bulb Low Cond 3K Balco ISO 7 1 R Electrode ORP flat 10K Q ID in NPT Electrode ORP flat 10K Q ID ISO 7 1 R Description In line Sensor Electronics w Junction Box In line Sensor Electronics w Junction Box and Easy Cal Submersible Sensor Electronics with 15 ft cable in NPT threads Submersible Sensor Electronics with 15 ft cable ISO 7 1 R threads Submersible Preamplifier with in NPT th
5. 1 inch NPT male threads 22709615 048 yellow retaining cap Do not overtighten Use appropriate eye face hand body and or respiratory protection when using chemicals or solvents Prior to installation or removal a Depressurize and vent system b Drain below sensor level Confirm chemical compatibility before use Do not exceed the maximum temperature pressure specifications Do not alter product construction If installing into a threaded connection 6 Inspect threads to insure integrity Do not install a sensor that has damaged threads 7 Apply PTFE tape to the process connection threads in accordance with industry practices Hand tighten the sensor into the process connection DO NOT USE TOOLS Failure to follow these instructions may result in personal injury 2 3 Removing the electrode from In line installations WARNING The use of this product assumes that operators are trained and are familiar with this type of device They should be knowledgeable of the potential risks associated with pressurized piping systems Operators MUST follow all necessary safety procedures In line removal Instructions Depressurize and vent the piping system Drain the system to below sensor level Wear safety goggles or face shield during removal Use all appropriate eye face hand body and or respiratory protection when working with chemicals or solvents Place a Lockout tag on the pipe when the s
6. Signet 2724 Series DryLoc pH and ORP Electrodes O 3 2724 090 Rev B 06 08 English _ 8 Hand tighten the sensor into the process connection DO NOT USE TOOLS WARNING 1 Use appropriate eye face hand body and or respiratory protection when using a Depressurize and vent system b Drain below sensor level VG 3 Confirm chemical compatibility before use 4 Do not exceed the maximum temperature pressure specifications 5 Do not alter product construction chemicals or solvents 2 Prior to installation or removal CAUTION 4 My If installing into a threaded connection Nyy Ma 6 Inspect threads to insure integrity Do not install a sensor that has damaged threads Do not use tools oS EA s Ch ED 7 Apply PTFE tape to the process connection threads in accordance with industry practices Hand tighten only 1 0 Description The Signet 2724 Series of pH and ORP electrodes is designed to minimize maintenance time and maximize value The unique DryLoc connector provides quick assembly and a secure connection featuring gold plated contacts and an O ring seal The patented design features a lengthened reference chamber pathway to extend the operational life of the electrode Wetted materials are selected to withstand a wide array of industrial applications Multiple mounting features address the need for installation flexibility These electrodes can be threaded into in NPT or ISO 7 1 R i
7. able 3 Saturate 50 mL of pH 4 or pH 7 buffer with g quinhydrone ORP test solutions 6 0 Electrode date code The electrode date code indicates the manufacturing date of the electrode Electrodes should be put into service as soon as possible and should not remain in the box for more than two years Over time the storage solution found in the boot covering the electrode tip will evaporate or leak allowing the delicate sensing tip and reference junction dry To rehydrate a dry electrode soak it in pH 4 buffer for 24 to 48 hours Electrodes more than 2 years old may still be functional but will take longer to rehydrate Restoration may not be effective for severely dehydrated electrodes First Letter Month Second Numeral Year L March J May H June G July E September D October C November B December 2 2017 Example K4 manufactured in April 2009 Signet 272X Series pH and ORP Electrodes GF 6 7 Maintenance and Cleaning 7 1 Electrode care and application pH ORP electrodes are similar to batteries they age with time and usage The following information will help maximize electrode life General Tips To insure uninterrupted operation of critical pH systems replacement electrodes should be available Store boxed electrodes flat or upright electrode tip down 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 syste
8. an also be used Oily or Organic Coatings Spray or vigorously stir the electrode with a mild detergent or an appropriate solvent that will not attack the materials of construction isopropyl alcohol or similar Gently wipe the electrode surfaces with a paper towel Always rinse the electrode with water after cleaning ORP Platinum Coating After Cleaning Soak the electrode in a pH 4 buffer with KCI if available for at least 10 minutes after cleaning GFt Signet 272X Series pH and ORP Electrodes 8 0 Ordering Information Mfr Part No 3 2724 00 3 2724 01 3 2724 10 3 2724 11 3 2726 00 3 2726 01 3 2726 10 3 2726 11 3 2726 HF 00 3 2726 HF 01 3 2726 HF 10 3 2726 HF 11 3 2726 LC 00 3 2726 LC 01 3 2726 LC 10 3 2726 LC 11 3 2725 60 3 2725 61 Accessories and Replacement Parts Mfr Part No 3 2750 1 3 2750 2 3 2750 3 3 2750 4 3 2760 1 3 2760 2 3 2760 3 3 2760 4 3 2760 11 3 2760 21 3 2760 31 3 2760 41 3 2759 3 2759 391 3 0700 390 3822 7004 3822 7007 3822 7010 GFt Georg Fischer Signet LLC 3401 Aerojet Avenue El Monte CA 91731 2882 U S A Tel 626 571 2770 Fax 626 573 2057 For Worldwide Sales and Service visit our website www gfsignet com Or call in the U S 800 854 4090 Code 159 001 545 159 001 546 159 001 547 159 001 548 159 001 553 159 001 554 159 001 555 159 001 556 159 001 549 159 001 550 159 001 551 159 001 552 159 001 557 159 001 558 159 0
9. around the electrode tip e Hand tighten the electrode into the process connection Do not use any tools to install the electrode The use of wrenches pliers or similar may over stress the sensor body and lead to breakage and subsequent spillage of the process liquid A broken sensor may be ejected forcefully from the fitting and cause severe injury e The safety instructions have an adhesive label that should be placed near the sensor 2 60 X1 In Line 2760 X Flexible conduit Preamplifier Submersible Preamplifier nao Flexible conduit Electrode Electrode WTI Wa Fitting customer supplied Signet Installation Fitting DN 15 to DN 100 7 in to 4 in 2 GF Signet 272X Series pH and ORP Electrodes 2 2 Signet Installation Fittings Type Description Type Description Plastic tees o Carbon steel o P e Available in 2 in to 4 in sizes weldolets e Available in 2 in to 4 in sizes e PVC CPVC w solvent cement socket e Requires 1 7 16 in hole in pipe e PVDF ans PP w union end fittings e Install by certified welder only PVC saddles Carbon steel Available in 2 in to 4 in sizes threaded tees Available in 1 4 in to 2 in sizes e Requires 1 7 16 in hole in pipe e Female NPT ends Iron Universal strap on SS a pipe adapters e Use for installation in pipes gt 4 in 1 in NPT saddles e Available in 2 in to 4 in sizes PVC CPVC or PVDF versions e Requires 1 7 16 in hole in pipe e Specify socket or
10. by 0 06 pH units if the temperature is reduced to 15 C 4 2 Electrochemical pH vs Millivolt Ratio e The mV output from the electrode is created by the interaction of the electrode and the fluid The electrode contains a gel Theoretical mV Values 25 C that depletes over time so the instrument must be readjusted a periodically to maintain system accuracy The need for H recalibration varies with each application but the life of the 295 8 mV electrode is usually consistent l l 236 64 mV e Keep a maintenance log to establish a depletion trend in new T177 48 mN systems e The mV calibration is a two point procedure Signet offers pH 118 32 mV buffer solutions prepared specifically for this purpose a 6 459 16 mV e pH buffer solutions can be used for calibrating more than one a ae O mV sensor within a day provided that the solutions are protected from debris and are not diluted by rinse water from the E E 5310 mV calibration procedure PG 118 32 mV e Use clean water to rinse buffer solutions from the electrode O a 177 48 mV e Dispose of all buffer solutions at the end of the day ont 236 64 mV e If the pH sensor will not calibrate within acceptable limits clean the electrode and recalibrate If the calibration results remain Ce 295 8 mV outside of acceptable limits the sensor is depleted and must Table 2 be discarded Electrode slope is the ratio of mV to pH units At 25 C the e Follow the guidelines of local waste
11. disposal regulations when theoretical slope is 59 16 mV per pH discarding buffer solutions and spent electrodes 5 GF Signet 272X Series pH and ORP Electrodes 5 ORP System Calibration ORP electrodes do not incorporate a temperature sensor so the only system calibration required is the electrochemical adjustment 5 1 Electrochemical ORP vs Millivolt Ratio e ORP measurements are relative values and single point adjustments are sufficient for most applications e Calibration should be done using ORP test solutions such as Light s Solution Zobell s solution or in pH buffers that have been saturated with quinhydrone Table 3 Quinhydrone is the oxidizer that is measured by the ORP electrode e Light s Solution and Zobell s solution are not compatible with the AutoCal function in Signet pH instrumentation e Anew ORP electrode measures the listed values 15 mV e The ORP electrode is functional until the offset exceeds 50 mV e An electrode whose offset measures greater than 50 mV should be cleaned and replaced if necessary e ORP solutions made with quinhydrone are very unstable and may not read properly after being exposed to air for a prolonged time These solutions must be discarded after a few hours e Dispose of all calibration solutions in accordance with local state and federal guidelines e Use clean water to rinse buffer solutions from the sensors Light s solution 4 pH buffer 7 pH buffer w quinhydrone w quinhydrone T
12. ensor is removed for maintenance to prevent accidental opening and exposure to potentially hazardous chemicals Signet 272X Series pH and ORP Electrodes GF 3 3 0 Submersibile Installations 3 1 Submersible Installation Tips e Choose a location that keeps the electrode glass completely submerged at all times e Mount electrodes in a location with ample clearance for removal e Mount the electrode near tank outlets away from reagent addition areas e Use the in threads at the top of the preamplifier to run the cable inside pipe or conduit e Backfill a few inches of the conduit with sealant to prevent moisture intrusion from inside the conduit e Place the electrode tip in pH 4 buffer during system maintenance or storage to avoid dehydration 3 2 Submersible Installation 2724 2726 with 2750 2760 Preamplifier The Signet 2724 and 2726 pH electrodes are designed to install in tanks by attaching conduit to the in threads at the top of the accompanying preamplifier or sensor electronics 1 The O ring at the top of the electrode fits very tightly into the preamplifier Use a small amount of lubricant non petroleum based to assist the assembly 2 To prevent moisture from migrating into the preamplifier backfill the conduit with 3 4 inches of sealant 3 Mount electrodes in a location with ample clearance to remove them for periodic cleaning and recalibration 4 Choose a location that keeps the electrode glass completely submersed
13. m maintenance intervals If the sensor dehydrates soak the sensor tip in pH 4 buffer for 24 to 48 hours then visually inspect the electrode for surface cracks swelling or discoloration It may not be possible to restore severely dehydrated electrodes to normal operation High temperatures strong acids or caustics will increase electrochemical reactions and speed electrode aging Coatings e g grease on the glass or junction surfaces cause extended response time and inaccurate measurement Never store the electrode tip in deionized DI water Use pH 4 buffer solution to keep the glass wet when out of the process Never store the electrode at temperatures below 0 C 32 F or allow it to dehydrate Never scrape or sand the glass electrode surface Treat glass electrode surfaces with care to prevent accidental breakage 7 2 Cleaning Suggested Solution Use a dilute acid solution HCI solution of 5 or less If the electrode has been used in applications with a pH value higher than 7 pH soak the electrode for 2 to 5 minutes Hard Coatings Soft Coatings Use a dilute alkaline solution NaOH solution at 5 or less if the electrode has been used in applications with pH values less than 7 pH soak the electrode for 2 to 5 minutes Alternating immersion in acidic and alkaline solutions may be necessary for thorough cleaning Spray or vigorously stir the electrode with a mild detergent such as dishwashing liquid Chlorine bleach c
14. nch pipe fittings submerged in a tank or mounted into familiar Signet installation fittings To build a stand alone self contained pH control system combine the electrode with a 3 2760 pH Preamplifier and add a 3 5700 pH ORP Monitor or a 3 8750 pH ORP Transmitter to move your control capability to the next level Combine the electrode with the 3 2750 pH Sensor Electronics to provide a 4 20 mA pH loop to a Programmable Logic Controller PLC a SCADA system or a datalogger Finally connect up to six pH signals to one 3 8900 MultiParameter Controller with the 3 2750 pH ORP Sensor Electronics with S L digital serial data output for a truly amazing set of features options and measurements 1 1 Specifications General Performance e Compatibility 2750 Electronics 2760 Preamplifier e Efficiency gt 97 25 C 77 F e Shipping Weight 0 25 kg 0 55 Ib Efficiency indicates the wellness of a new electrode e pH Temp Sensor Efficiency is measured by comparing the actual slope mV pH PT1000 versions are compatible with Signet 2750 pH ORP at 25 C to the theoretical output of 59 16 mV pH An efficiency Sensor electronics for connection to a PLC or to the Signet of 97 to 100 is equivalent to a slope of 57 39 to 59 16 mV 8900 Multi Parameter Controller pH 3KQ Balco versions are compatible with the Signet 2760 pH ORP preamplifier for connection to the Signet 5700 pH ORP e Measuring range Monitor and the Signet 8750 pH ORP Transmitter pH
15. reads and 4 6 m 15 ft cable Submersible Preamplifier with in ISO threads and 4 6 m 15 ft cable Submersible Connector with 4 6 m 15 ft cable and in NPT threads Submersible Connector with 4 6 m 15 ft cable and ISO 7 1 R in threads In line Preamplifier with in NPT threads and 4 6 m 15 ft cable In line Preamplifier with in ISO threads and 4 6 m 15 ft cable In line Connector with 4 6 m 15 ft cable and in NPT threads In line Connector with 4 6 m 15 ft cable and ISO 7 1 R threads pH ORP System Tester adapter cable sold separately 2759 DryLoc Adapter Cable for use with 2750 and 2760 pH Buffer Kit 1 each 4 7 10 pH buffer in powder form makes 50 mL pH 4 buffer solution pint 16 oz 473 ml pH 7 buffer solution pint 16 oz 473 ml pH 10 buffer solution pint 16 oz 473 ml Georg Fischer Signet LLC 2008 Printed in U S A on recycled paper
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