Retractable pH/ORP Sensor - Emerson

1 Model 396 RInstruction SheetPN 51A-396 2011 SPECIFICATIONSMODEL 396 RMeasurements and RangespH: 0-14; ORP: -1500 to 1500 mV*Available pH ACCUGLASST ypesGPLR hemi bulb or GPLR flat bulbWetted MaterialsPolypropylene, EPDM, titanium, glass, (platinum: ORP only)Process ConnectionNone, use 1 inch process connector or ball valve kit (1-1/2 inch or 1-1/4 inch sold separately)Temperature Range0 to 100 C (32 to 212 F)Pressure Range - Hemi bulb100 to 1136 kPa (abs) (0 to 150 psig)Pressure Range - Flat bulb100 to 790 kPa (abs) (0 to 100 psig)Maximum Pressure at Retraction Code 21: 542 kPa (abs) (64 psig) or InsertionCode 25: 343 kPa (abs) (35 psig) Minimum Conductivity100 S/cm, nominalPreamplifier OptionsRemotePERCENT LINEARITY FOR MODEL 396 RpH rangeGPLR Hemi bulbGPLR Flat bulb0-294%93%2-1299%98%12-1397%95%13-149 2% Retractable SENSORSR etractable sensors must notbe inserted nor retractedwhen process pressures are in excess of 64 psig(542kPa) for option 21 or 35 psig (343 kPa) for option pressure may cause the Sensor to blow out withgreat force unless care is taken during removal.

2 Allow sufficient room for safe retraction and insertion of thesensor. Personnel should have room for stable footingwhile performing removal or insertion of the It is recommended that electrodes be stored in theiroriginal shipping containers until Do not store at temperatures below -5 C (23 F).3. Electrodes should be stored with a protective cap con-taining KCl solution (PN 9210342).4. For overnight storage, immerse the Sensor in tap wateror 4 pH buffer A pH glass electrode does have a limited shelf life ofone PREPARATION1. Remove electrode from shipping Remove the protective boot covering the electrode Rinse away salt film with clean water, then gently shakethe electrode so that the internal solution fills the bulb,thus removing any air trapped pH/ORP SensorSpecifications subject to change without additional information, please visit our website at wetted Sensor materials may not be compatible withprocess com position and operating compat ibility is entirely theresponsibilityof the APPLICATION COMPATIBILITYWARNINGWARNINGATEX DIRECTIVES pecial Conditions for safe use1.

3 All pH/ORP sensors have a plastic enclosure whichmust only be cleaned with a damp cloth to avoid thedanger due to a build up of an electrostatic All pH/ORP Sensor Models are intended to be in con-tact with the process fluid and may not meet the test to earth. This must be taken into con-sideration at Sensor dimensions, see Figures 1 and Sensor orientation and installation, see Figures 3 - wiring, see Figures 6 - Sensor CALIBRATION ANDMAINTENANCETWO POINT pH BUFFER CALIBRATIONS elect two stable buffer solutions, preferably pH (pH buffers other than pH and pH be used as long as the pH values are at least twopH units apart). NOTEA pH 7 buffer solution reads a mV value ofapprox. zero, and pH buffers read approximate-ly mV for each pH unit above or below pH7. Check the pH buffer manufacturer specifica-tions for millivolt values at various temperaturessince it may affect the actual value of the buffersolution mV/pH Immerse Sensor in the first buffer solution.

4 Allowsensor to equilibrate to the buffer temperature (toavoid errors due to temperature differencesbetween the buffer solution and Sensor tempera-ture) and wait for reading to stabilize. Value of buffercan now be acknowledged by Once the first buffer has been acknowledged by theanalyzer/transmitter, rinse the buffer solution off ofthe Sensor with distilled or deionized Repeat steps 1 and 2 using the second buffer The theoretical slope value, according to the Nernstequation for calculating pH, is approximately Over time the Sensor will age, both in theprocess and in storage, and will result in reducedslope values. To ensure accurate readings, it is rec-ommended that the electrode be replaced when theslope value falls below 47 to 49 pH Sensor STANDARDIZATIONFor maximum accuracy, the Sensor can be standard-ized on-line or with a process grab sample after abuffer calibration has been performed and the sensorhas been conditioned to the process.

5 Standardizationaccounts for the Sensor junction potential and otherinterferences. Standardization will not change the sen-sor s slope but will simply adjust the analyzer s readingto match that of the known process FOR pH ELECTRODESE lectrodes should respond rapidly. Sluggishness, off-sets, and erratic readings are indicators that the elec-trodes may need cleaning or To remove oil deposit, clean the electrode with amild non-abrasive To remove scale deposits, soak electrodes for 30 to60 minutes in a 5% hydrochloric acid Temperature effect on life expectancy: If glass elec-trode life expectancy is 100% @ 25 C (77 F), thenit will be approximately 25% @ 80 C (176 F). ORP Sensor CALIBRATION ANDMAINTENANCECALIBRATION1. After making an electrical connection between thesensor and the instrument, obtain a standard solu-tion of saturated quinhydrone.

6 This can also bemade quite simply by adding a few crystals of quin-hydrone to either pH 4 or pH 7 buffer. Quinhydroneis only slightly soluble, therefore only a few crystalswill be Immerse the Sensor in the standard solution. Allow1-2 minutes for the ORP Sensor to Adjust the standardize control of the instrument tothe solution value shown in the table below. Theresulting potentials, measured with a clean plat-inum electrode and saturated KCl/AgCl referenceelectrode, should be within +/- 20 millivolts of thevalue shown in the table below. Solution tempera-ture must be noted to ensure accurate interpreta-tion of results. The ORP value of saturated quinhy-drone solution is not stable over long periods oftime. Therefore, these standards should be madeup fresh each time they are Remove the Sensor from the buffer, rinse, andinstall in the FOR ORP ELECTRODESE lectrodes should respond rapidly.

7 Sluggishness, off-sets, and erratic readings are indicators that the elec-trodes may need cleaning or To remove oil deposit, clean the electrode with amild non-abrasive To remove scale deposits, soak electrodes for 30 to60 minutes in a 5% hydrochloric acid ORP (metallic) electrodes should be polished withmoistened baking electrical tape or shrink sleeve from gray reference wire before connecting wire to 4 Solution pH 7 SolutionTemp C20 25 30 20 25 30mV Potential 268 264 260 94 87 80 ORP of Saturated Quinhydrone Solution (millivolts)3 INCHMILLIMETERINCHMILLIMETERFIGURE 1. Dimensional Drawing: Model 396R with Optional Ball Valve PN 23240-00 FIGURE 2. Dimensional Drawing: Model 396R with Optional Ball Valve PN 23765-00 NOTE: ADD FIVE (5) INCHES TO DIMENSION AIF MOUNTING A Sensor HEAD JUNCTIONBOX ONTO THE : ADD FIVE (5) INCHES TO DIMENSION AIF MOUNTING A Sensor HEAD JUNCTIONBOX ONTO THE 3.

8 Exploded View of Ball Valve Kit PN 23240-00 used with process connector PN 23166-00 (orPN 23166-01)[Ball Valve Kit includes 1-1/2 in. x 1 in. reducer, 1-1/2 in. close nipple, and 1-1/2 in. ball valve]FIGURE 4. Exploded View of Ball Valve Kit PN 23765-00 FIGURE 5. Mounting Details - Retraction VersionJUNCTION BOX IS OPTIONAL5 DWG. AWHEN INCH AND METRIC DIMSARE GIVENMILLIMETERINCHFIGURE 6. Cable Preparation Instructions (PN 9200274)WARNING: IF INNER BLACKCONDUCTIVE SHEATH IS INCONTACT WITH THE EXPOSEDLEADS, OR IS NOT PREPAREDPROPERLY, IT MAY CAUSE ANELECTRICAL CFIGURE 7. Wiring Details Model 396R-54 for use withModels 54, 54e, 81, 3081, 4081 pH/ORP , and 5081-PWHEN INCH AND METRIC DIMSARE GIVENMILLIMETERINCHDWG. AFIGURE 9. Wiring Details - Model 396R-50 for use with Remote Junction Box (PN 23309-03)1 PREP ORANGE WIRE FOR PREAMPWITH BNC ADAPTER (PN 9120516).

9 DANGER:Do not connect sensorcable to power injury may 8. Wiring Details Model 396R-54 with Remote J-Box and Preamp (PN 23555-00)DWG. BDWG. APREP ORANGE WIRE FOR PREAMPWITH BNC ADAPTER (PN 9120516).1 DANGER:Do not connect sensorcable to power injury may 10. Wiring Details - Model 396R-54 for use with Remote Junction Box (PN 23309-04)7 DWG. AFIGURE 11. Wiring Details - Model 396R-50/54 for use with Model 1181 pH/ORP1 PREP ORANGE WIRE FOR PREAMPWITH BNC ADAPTER (PN 9120516).DWG. AFIGURE 12. Wiring Details - Model 396R-54 for use with Models 1054A/B pH/ORP , 2054 pH, and 2081 pH/ORP8 Figure 13. Wiring Details: Model 396R-54 for use with J-Box (PN 23708-01) to Models 1054 Series,2054, and 2081 pH TransmittersPREPARE ORANGE WIREFOR PREAMP, USE BNCADAPTER PN 9120516 DWG. ADWG. AFIGURE 14. Wiring Details - Model 396R-54 for use with Model SCL-(P/Q)FIGURE 15.

10 Wiring Details - Model 396R-54 for use with Model 2700 Preamp J-Box (PN 23054-03)9 DWG. DFIGURE 16. Wiring Details - Model 396R-54-61 for use with Sensor Head J-Box for use with Models 54, 54e, 81, 3081, 4081, and 508110 WHEN INCH AND METRIC DIMSARE GIVENMILLIMETERINCHDWG. C/CFIGURE 17. Wiring Details - Model 396R-50/54-60 for use with Sensor Head J-Boxes for Models 1181, 1054 Series, 2054, 208111 FIGURE 20. Wiring Model 396R-( )-54-(61) to Model 1055-01-10-22-32 FIGURE 21. Male Connector Tightening DiagramFIGURE 19. Wiring Model 396R-54-61 to Model Xmt-P-HT-10 RETRACTION WITH KIT PN 23240-00A. Model 396R-21 (21 tube)1. Be certain system pressure at the Sensor is below 64psig (542 kPa) before proceeding with the retraction. Itis also recommended that the personnel wear a faceshield and have a stable footing. Refer to Figures 21and 22.