Rosemount Analytical RB Operating Manual
Model RB
Threaded In-Line, Submerged or
Ball-valve Insertion pH Sensor
For additional information, please refer to enclosed DVD
or visit our website at www.emersonprocess.com/raihome/liquid/.
CAUTION
The solution used during calibration is an acid and
should be handled with care. Follow the directions of
the acid manufacturer. Wear the proper protective
equipment. Do not let the solution come in contact
with skin or clothing. If contact with skin is made,
immediately rinse with clean water.
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!
WARNING
The wetted sensor materials may not be compatible
with process com position and operating conditions.
Application compat ibility is entirely the
responsi-
bility of the user.
CAUTION
SENSOR/PROCESS APPLICATION COMPATIBILITY
SPECIFICATIONS
Sensor Type: Poison Resistant pH
Measured Range: pH: 0-14
Maximum Temperature:
266°F/130°C at 40 psig/276 KPa
Maximum Pressure: 150 psig/1035 KPa at 158°F/70°C
Maximum Insertion/Retraction Pressure:
(option 546)
65 psig/448 KPa at 158°F/70°C
(option 547) 40 psig/276 KPa at 266°F/130°C
Instruction Sheet
PN 51A-RB
June 2012/rev.B
MODEL RB 546
submersion/In-line
pH Sensor
MODEL RB 547
Ball Valve Insertion
pH Sensor
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.
2
STORAGE AND MAINTENANCE
Model RB pH sensors require little care or maintenance.
Simple guidelines follow:
During storage, sensors should be kept near room temperature and remain capped on the measuring end.
These caps supplied from the factory are filled with a
weak pH 7 buffer in order to keep the sensor wet.
Sensors in storage should be checked semi-annually to
assure that the cap retains moisture, if the pH 7 buffer
evaporates, it may be replaced with ordinary tap water.
Cleaning of the pH sensor is easy. The reference usually
does not require maintenance. Should a coating form
over the exposed portion of the reference, it can usually
be scraped off with a small penknife. Care must be taken
not to break the glass when scraping the reference.
Glass pH electrodes can be cleaned in a number of
ways. Scaling, oils, and other stubborn coatings can
usually be removed by soaking the reference in 3-10%
HNC solution for a few minutes and then rinsing under
tap water. Very heavy coatings may require more than
one soaking. Simple cleaning of minor coatings can
often be accomplished by directing a stream of clean
tap water directly onto the glass. Wiping the glass with
a clean, soft cloth may be sufficient with new sensors.
Care must be taken with this approach as the glass
may break when mishandled.
Oils or greases that can accumulate on the glass bulb
may not be visible to the eye. To remove these, stir the
sensor in a solvent such as isopropyl alcohol. Heavy
build-up may require a number of alcohol cycles followed
by wiping with a soft cloth. A dish soap may also be used.
Sensor cables should be run through conduit or be protected from the environment, they are not weatherproof. Do not allow cables and connectors to become
wet, lay on the ground or across equipment, etc.
Cables should not be abraded, pinched, twisted or
sharply bent.
MODEL RB MAINTENANCE
FIGURE 1. Sensor Dimensions, Submersion/In-Line
3
MODEL RB INSTALLATION
FIGURE 2. Sensor Dimensions, Ball Valve Insertion
FIGURE 4. Sensor Dimensions, Ball Valve Insertion
FIGURE 3. Sensor Dimensions, Ball Valve Insertion
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