Model 371 pH Sensor with VP 6.0
13.5 EuroSenz
™
Instruction Sheet
PN 51A-371pHVP/rev.E
January 2011
SPECIFICATIONS
pH Range: 0-14 pH
Membrane Type: General Purpose Low
Resistance (GPLR)*
Percent Linearity: 96% @ 0-4 pH, 99% @ 4-12
pH, 97% @ 12-13 pH, 92% @ 13-14 pH
Wetted Materials: Polypropylene, EP, and Glass
Process Connection: Standard PG 13.5 Thread
Electrode Connection: Variopole (VP 6.0) for TC
Temperature Compensation: Optional Pt100 or
Pt1000
Temperature Range: 0° - 95°C (32° - 203°F)
Pressure Range: 100 - 790 kPa abs (0 - 100
psig)
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 has a limited shelf life of
one year.
FIGURE 1. Sensor Dimensions
MILLIMETER
INCH
For additional information, please visit our website at
www.emersonprocess.com/raihome/liquid/.
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
responsibility
of the user.
CAUTION
SENSOR/PROCESS APPLICATION COMPATIBILITY
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.
FIGURE 2. Sensor Orientation
MOUNTING
For sensor orientation, see Figure 2.
WIRING
For wiring, see Figures 3 to 8.
FIGURE 3. VP 6.0 Cable Description
CABLE
FIGURE 4. Wiring to Models 54, 81, 3081, and
remote junction box PN 23555-00
FIGURE 5. Wiring to Model 2081
WIRING
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.
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