Emerson Models 3800 and 3800VP PUR Sense Autoclavable and Steam Sterilizable pH Sensors Instruction Sheet
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Instruction Sheet PN 51A-3800/3800VP/rev.C January 2011 Models 3800 and 3800VP TM Autoclavable and Steam Sterilizable pH Sensors For additional information visit our website at www.emersonprocess.com/raihome/liquid/. SPECIFICATIONS Sensor Type: 3800, 3800VP, GPHT glass with hemi bulb Range: pH 0 to 14 Temperature Range: up to 105°C (steam up to 140°C) / up to 221 F° (steam up to 284 F°) Pressure Range: max 6 bar at 105°C/ max 72 psig (600kPa) at 221 F°) Temperature sensor: Pt 100 Wetted Materials: Glass, ceramic and EPDM o-ring USP VI Reference Junction: Single Ceramic junction Electrolyte: Gelled polymer Cable Connector: Type VP 8 - multipin pH connector head, or coaxial S8 Process Connector: Pg 13.5 connector Dimensions: 12 mm OD, shaft length -01= 120 mm , -02 = 225 mm , -03 = 325 mm MODELS 3800 & 3800VP Remarks: Suitable for all Rosemount pH-instruments. Quality certification includes list of wetted materials and calibration records WARNING Before removing the sensor, be absolutely certain that the process pressure is reduced to 0 psig and the process temperature is lowered to a safe level! ATEX DIRECTIVE Special Conditions for safe use 1. All pH/ORP sensors have a plastic enclosure which must only be cleaned with a damp cloth to avoid the danger due to a build up of an electrostatic charge. 2. All pH/ORP sensor Models are intended to be in contact with the process fluid and may not meet the 500V r.m.s. a.c. test to earth. This must be taken into consideration at installation. CAUTION SENSOR/PROCESS APPLICATION COMPATIBILITY The wetted sensor materials may not be compatible with process composition and operating conditions. Application compatibility is entirely the responsibility of the user. WARNING Do not exceed temperature and pressure limitations of 140°C (284°F) and 72 psig (600 kPa, 6 bar). CAUTION Internal electrolyte fill solution may cause skin or eye irritation. STORAGE 1. It is recommended that electrodes be stored in their original shipping containers until needed. 2. Do not store at temperatures below -5°C (23°F). 3. Electrodes should be stored with a protective cap containing KCl solution (PN 9210342). 4. For overnight storage, immerse the sensor in tap water or 4 pH buffer solution. 5. A pH glass electrode does have a limited shelf life of one year. ELECTRODE PREPARATION 1. Remove electrode from shipping container. 2. Remove the protective boot covering the electrode bulb. 3. Rinse away salt film with clean water, then shake the electrode so that the internal solution fills the bulb, thus removing any air trapped there. NOTE Do not allow lubricant to coat electrode bulb or reference junction. If it does, wipe it clean before installation. INSTALLATION For sensor orientation, see Figure 2. For wiring, see Figures 3 through 13. VP 8.0 PLUG SW17 FREE SPINNING PG 13.5 THREAD WASHER O RING 2-205 EPDM SENSOR PART NUMBER A DIMENSION 3800-01/3800VP-01 120mm 3800-02/3800VP-02 225mm 3800-03/3800VP-03 325mm FIGURE 1. Model 3800 & 3800VP Dimensional Drawing FIGURE 2. Sensor Orientation 2 TWO POINT BUFFER CALIBRATION Select two stable buffer solutions, preferably pH 4.0 and 10.0 (pH buffers other than pH 4.0 and pH 10.0 can be used as long as the pH values are at least two pH units apart). NOTE A pH 7 buffer solution reads a mV value of approx. zero, and pH buffers read approximately ±59.1 mV for each pH unit above or below pH 7. Check the pH buffer manufacturer specifications for millivolt values at various temperatures since it may affect the actual value of the buffer solution mV/pH value. 1. Immerse sensor in the first buffer solution. Allow sensor to equilibrate to the buffer temperature (to avoid errors due to temperature differences between the buffer solution and sensor temperature) and wait for reading to stabilize. Value of buffer can now be acknowledged by analyzer/transmitter. 2. Once the first buffer has been acknowledged by the analyzer/transmitter, rinse the buffer solution off of the sensor with distilled or deionized water. 3. Repeat steps 1 and 2 using the second buffer solution. 4. The theoretical slope value, according to the Nernst equation for calculating pH, is approximately 59.17 mV/pH. Over time the sensor will age, both in the process and in storage, and will result in reduced slope values. To ensure accurate readings, it is recommended that the electrode be replaced when the slope value falls below 47 to 49 mV/pH. RECOMMENDED pH SENSOR STANDARDIZATION For maximum accuracy, the sensor can be standardized on-line or with a process grab sample after a buffer calibration has been performed and the sensor has been conditioned to the process. Standardization accounts for the sensor junction potential and other interferences. Standardization will not change the sensor’s slope but will simply adjust the analyzer’s reading to match that of the known process pH. MAINTENANCE Electrodes should respond rapidly. Sluggishness, offsets, and erratic readings are indicators that the electrodes may need cleaning or replacement. 1. To remove oil deposit, clean the electrode with a mild non-abrasive detergent. 2. To remove scale deposits, soak electrodes for 30 to 60 minutes in a 5% hydrochloric acid solution. 3. Temperature effect on life expectancy: If glass electrode life expectancy is 100% @ 25°C (77°F), then it will be approximately 25% @ 80°C (176°F), and approximately 5% @ 120°C (248°F). FIGURE 3. VP8 Cable, sensor end FIGURE 4. VP8 Cable, instrument end 3 WIRING FIGURE 5. VP8 Standard wiring to wireless 6081. 3800VP sensor 3800VP FIGURE 6. VP8 standard. VP8 cable wiring works with both VP6 and VP8 sensor connector. 3800VP Wiring to Model 1056 -22 -32 -AN 4 3800VP FIGURE 7. 3800VP Wiring to Model 54e. This is the standard wiring for VP8 cable assembly. VP8 works both with VP6 and VP8 sensor connector. 3800VP VP8 Cabls P/N 24281-XX FIGURE 8. 3800VP Wiring to Model 5081. This is the standard wiring for VP8 cable assembly. VP8 works both with VP6 and VP8 sensor connector. 5 FIGURE 9. Model 1055-01-10-22 single sensor wiring to 3800VP VP6 (28645-XX) FIGURE 10. 3800VP Wiring to Model 1055-01-10-22-32 dual sensor wiring VP6 (28645-XX) 3800VP FIGURE 11. VP8 Wiring 3800VP to Model Xmt-P-HT-11 (Pipe Surface Mount) Note: If no there is no temperature compensation (RTD), then install a 100-ohm resistor between TB1-1 and TB1-3, and install a jumper between TB1-1 and TB1-2. 6 MODEL 54e, 81, 5081-P, 3081, 4081 FIGURE 12. Wiring Drawing For Model 3800 with S8 Connector 3800 FIGURE 13. S8 cable Wiring to Model 1056 -22 -32 -AN 7 ACCESSORIES Part Number Description 23645-07 23645-10 23645-11 23645-12 23645-13 9200338 9200339 9160478 9999SQ8940 24167-03 9999SQ10057 VP6 external cable 15 ft long ( no ground wire) VP6 external cable 10 ft long VP6 external cable 20 ft long VP6 external cable 30 ft long VP6 external cable 4 ft long S8 cable, free rotating connector, single pole 5m long S8 cable, free rotating connector, single pole 10m long G 1 ¼” x Pg 13.5 insertion adapter 1.5” Tri-Clamp adapter ¾” NPT 1” x Pg 13.5 insertion adapter 1” NPT x Pg 13.5 insertion adapter 24281-00 24281-01 24281-02 24281-03 24281-04 24281-05 24281-06 24281-07 24281-08 15 ft. cable with mating VP8 connector 25 ft. cable with mating VP8 connector 2.5 ft. cable with mating VP8 connector 50 ft. cable with mating VP8 connector 100 ft. cable with mating VP8 connector 4 ft. cable with mating VP8 connector 10 ft. cable with mating VP8 connector 20 ft. cable with mating VP8 connector 30 ft. cable with mating VP8 connector 24167-03 34012-03 24166-00 24313-00 Pg 13.5 insertion kit ¾” threads Pg 13.5 insertion ¾” threads 316 SS EDPM O-Ring VP connector cap for Sterilization The right people, the right answers, right now. ON-LINE ORDERING NOW AVAILABLE ON OUR WEB SITE http://www.raihome.com Specifications subject to change without notice. 8 Credit Cards for U.S. Purchases Only. Emerson Process Management 2400 Barranca Parkway Irvine, CA 92606 USA Tel: (949) 757-8500 Fax: (949) 474-7250 http://www.raihome.com © Rosemount Analytical Inc. 2011