Rosemount Manual: 396RVP, 398RVP TUpH Retractable pH/ORP Sensor Abridged | Rosemount Manuals & Guides
Instruction Sheet TUpH Sensors
LIQ_MAN_ABR_396RVP-398RVP September 2013
TUpH™ 396RVP and 398RVP
Retractable pH/ORP Sensors
Specifications
SPECIFICATIONS
Measurements and Ranges pH: 0-14; ORP: -1500 to 1500 mV* pH: 0-14; ORP: -1500 to 1500 mV**
Available pH AccuGlAss Types GPLR hemi bulb or GPLR flat bulb GPHT hemi bulb or GPLR flat bulb
Wetted Materials Polypropylene, EPDM, titanium, glass, Titanium, Tefzel, glass, choice of Kalrez,
(platinum: ORP only) Viton, or EPDM (platinum: ORP only)
Process Connection None, use 1 inch process connector or ball valve kit None, use 1 inch process connector or ball valve kit
(1-1/2 inch or 1-1/4 inch — sold separately) (a1-1/2 inch or 1-1/4 inch — sold separately)
Temperature Range 0 to 100°C (32 to 212°F) 0 to 100°C (32 to 212°F)
Pressure Range - Hemi bulb 100 to 1136 kPa (abs) (0 to 150 psig) 100 to 1825 kPa (abs) (0 to 250 psig)
Pressure Range - Flat bulb 100 to 790 kPa (abs) (0 to 100 psig) 100 to 790 kPa (abs) (0 to 100 psig)
Maximum Pressure at Retraction Code 21: 542 kPa (abs) (64 psig) Code 21: 542 kPa (abs) (64 psig)
or Insertion Code 25: 343 kPa (abs) (35 psig) Code 25: 343 kPa (abs) (35 psig)
Minimum Conductivity 100 µS/cm, nominal 100 µS/cm, nominal
Preamplifier Options integral SMART integral SMART
Solution Ground Yes No
396RVP 398RVP
*PERCENT LINEARITY FOR 396RVP
pH range GPLR Hemi bulb GPLR Flat bulb
0-2 94% 93%
2-12 99% 98%
12-13 97% 95%
13-14 92% —
**PERCENT LINEARITY FOR 398RVP
pH range GPHT Hemi bulb GPLR Flat bulb
0-2 94% 93%
2-12 99% 98%
12-13 97% 95%
13-14 92% —
CAUTION: SENSOR/PROCESS APPLICATION COMPATIBILITY
The wetted sensor materials may not be compatible with process com position and operating conditions. Application compat ibility
is entirely the responsibility of the user.
WARNING
System pressure may cause the sensor to blow out with great force unless care is taken during removal. Allow sufficient room for
safe retraction and insertion of the sensor. Personnel should have room for stable footing while performing removal or insertion of
the sensor.
TUpH Sensors Instruction Sheet
September 2013 LIQ_MAN_ABR_396RVP-398RVP
WARNING
Retractable sensors must not be inserted nor retracted when process pressures are in excess of 64 psig (542kPa) for option 21 or
35 psig (343 kPa) for option 25.
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.
GENERAL SPECIFICATIONS
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 gently shake the electrode so that the internal solution fills the bulb,
thus removing any air trapped there.
CAUTION
The buffer in the protective boot may cause skin or eye irritation.
INSTALLATION
For sensor dimensions, see Figures 1 and 2.
For sensor orientation and installation, see Figures 3 - 5.
For wiring, see Figures 6 - 22.
pH Sensor Calibration and Maintenance
TWO POINT PH 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.
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Instruction Sheet TUpH Sensors
LIQ_MAN_ABR_396RVP-398RVP September 2013
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).
ORP Sensor Calibration and Maintenance
CALIBRATION
1. After making an electrical connection between the sensor and the instrument, obtain a standard solution of
saturated quinhydrone. This can also be made quite simply by adding a few crystals of quinhydrone to either pH 4
or pH 7 buffer. Quinhydrone is only slightly soluble, therefore only a few crystals will be required.
2. Immerse the sensor in the standard solution. Allow 1-2 minutes for the ORP sensor to stabilize.
3. Adjust the standardize control of the instrument to the solution value shown in the table below. The resulting
potentials, measured with a clean platinum electrode and saturated KCl/AgCl reference electrode, should be within
+/- 20 millivolts of the value shown in the table below. Solution temperature must be noted to ensure accurate
interpretation of results. The ORP value of saturated quinhydrone solution is not stable over long periods of time.
Therefore, these standards should be made up fresh each time they are used.
4. Remove the sensor from the buffer, rinse, and install in the process.
ORP of Saturated Quinhydrone Solution (millivolts)
pH 4 Solution pH 7 Solution
Temp °C 20 25 30 20 25 30
mV Potential 268 264 260 94 87 80
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. ORP (metallic) electrodes should be polished with moistened baking soda.
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TUpH Sensors Instruction Sheet
September 2013 LIQ_MAN_ABR_396RVP-398RVP
Retraction
WARNING
System pressure may cause the sensor to blow out with great force unless care is taken during removal. Make sure the following
steps are adhered to.
A. Model 396R-21 (21” tube)
1. Be certain system pressure at the sensor is below 64 psig (542 kPa) before proceeding with the retraction. It is also
recommended that the personnel wear a face shield and have a stable footing. Refer to Figure 4-1. Push in on the
sensor end or the top of the J-box and slowly loosen the hex nut (B) of the process end male connector (A).
B. Model 396R-25 (36” tube)
1. Be certain that pressure at the sensor is below 35 psig (343 KPa) before proceeding with the retraction. It is also
recommended that the personnel wear a face shield and have a stable footing. Refer to Figure 4-1. Push in on the
sensor end or the top of the J-box and slowly loosen the hex nut (B) of the process end male connector (A).
CAUTION
Do not remove nut at this time.
2. When the hex nut is loose enough, slowly ease the sensor back completely until the retraction stop collar is
reached.
CAUTION
Failure to withdraw the sensor completely may result in damage to the sensor when the valve is closed.
3. Close the ball valve slowly. If there is resistance, the valve may be hitting the sensor. Double check that the sensor
has been retracted to the retraction stop collar.
WARNING
Before removing the sensor from the ball valve, be absolutely certain that the ball valve is fully closed. Leakage from the male connector threads may indicate that the male connector is still under pressure. Leakage through a partially open valve could be hazardous, however with the ball valve closed, some residual process fluid may leak from the connector’s pipe threads.
4. The Male Connector Body (A) may now be completely unthreaded from the reducing coupling and the sensor
removed for servicing.
CAUTION
If the male connector leaks during insertion or retraction, replace the O-ring (PN 9550099) in the male connector A.
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Instruction Sheet TUpH Sensors
LIQ_MAN_ABR_396RVP-398RVP September 2013
FIGURE 1. Dimensional drawing: Sensor
with Optional 1-1/2 inch Ball Valve PN 23240-00
INCH
MILLIMETER
FIGURE 2. Dimensional drawing: Sensor
with Optional 1-1/4 inch Ball Valve PN 23765-00
FIGURE 3. Exploded View of Ball Valve Kit PN 23240-00 used with process connector PN 23166-00 (or PN 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
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TUpH Sensors Instruction Sheet
September 2013 LIQ_MAN_ABR_396RVP-398RVP
figure 5. Mounting Details Note: Sensor must be mounted at an angle between 10° and 90° above the
horizontal. Pipe tees and weldalets provided by customer.
FIGURE 6. VP8 Cable, sensor end
NOTE:
For additional wiring information on this product, including sensor combinations not shown here, please refer to either our online
wiring programs or the Manual DVD enclosed with each product.
1056, 1057, 56, 5081, 6081, 54e, and XMT :
http://www3.emersonprocess.com/raihome/sp/liquid/wiring/XMT/
1066 and sensors with SMART preamps:
http://www2.emersonprocess.com/en-US/brands/rosemountanalytical/Liquid/Sensors/Pages/ Wiring_Diagram.aspx
1055:
http://www3.emersonprocess.com/raihome/sp/liquid/wiring/1055/
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