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MODEL 399VP pH/ORP SENSOR SECTION 1.0
DESCRIPTION AND SPECIFICATIONS
SECTION 1.0.
DESCRIPTION AND SPECIFICATIONS
1.1 FEATURES AND APPLICATIONS
1.2 PHYSICAL SPECIFICATIONS
1.3 ORDERING INFORMATION
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1.1 FEATURES AND APPLICATIONS
The Rosemount Analytical Model 399VP Sensor meas-
ures the pH or the Oxidation Reduction Potential
(ORP) of aqueous solutions in pipelines, open tanks,
or ponds. It is suitable for virtually all applications
where a low cost sensor is required. The combination
electrode features a ceramic junction constructed in
an annular design around the pH/ORP sensitive
membrane. The double or triple junction reference
cell configuration is resistant to process solutions
containing ammonia, chlorine, cyanides, sulfides, or
other poisoning ions.
The glass electrode is housed in a molded Tefzel
body and sealed with Viton
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O-rings to guard against
process leakage. The cable end of the sensor is also
sealed, eliminating cable shorts caused by exposure
to moisture. This construction makes for a highly
chemical resistant disposable sensor and does not
require electrolyte replenishment.
The custom glass electrode is available with either a
standard hemi bulb or an optional flat bulb to best
meet your application needs. Flat glass is advanta-
geous in abrasive or coating applications that etch or
build up on the glass respectively. In coating applica-
tions, such as slurries, the flat surface allows the
process flow to act as a scrubbing agent to reduce
coating and maintenance whereas in abrasive appli-
cations pitting from silicates and other similar materi-
als is minimized by the flat surface to provide longer
life. The hemi bulb is ideal for general purpose use
and for those processes requiring greater accuracy
over the entire pH range
Installation is easily achieved through the wide variety
of mounting configurations. The Model 399VP fea-
tures 1 in. (MNPT) front and rear facing connections
for insertion, submersion or flow through pH and ORP
applications.
1.2 PHYSICAL SPECIFICATIONS
Materials of Construction: Tefzel, glass, ceramic
and Viton (also, Platinum for ORP sensor)
Process Connections: 1 in. MNPT
Interconnecting Cable: None - must use mating VP
cable
Measured Range: pH: 0-14*
ORP: –1500 -+1500mV
*Percent Linearity over pH range:
Temperature Compensation: Automatic 0 to 85°C
(32° to 185°F) (Temperature compensation is not
required for 399 ORP when used with Models 1060,
1023 or 1181 ORP)
Maximum Pressure: 790 kPa abs (100 psig) at 65°C
(Refer to Graph A below)
Weight/Shipping Weight: 0.45 kg/0.9 kg (1 lb/2 lb)
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Registered trademarks of E. I. du Pont de Nemours and Company.
Hemi Bulb Flat Bulb
1-2 pH 94% 93%
2-12 pH 99% 98%
12-13 pH 97% 95%
GRAPH A. Pressure/Temperature Limitations
for Model 399VP