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MODEL 399VP pH/ORP SENSOR SECTION 2.0
INSTALLATION
2.5 SUBMERSION INSTALLATIONS.
The Model 399VP Sensor has a 1 in. MNPT process connection at the back of the sensor (see Figure 2-1). Utilizing
a standard 1 in. union (such as PN 9330022), the sensor may be mounted to a 1 in. SCH 80 CPVC or PVDF stand-
pipe. The sensor can also be mounted in the Handrail Mounting Assembly (PN 11275-01; see Figure 2-6). Tapered
pipe threads in plastic tend to loosen after installation. It is therefore recommended that the tightness of the con-
nection be checked frequently to ensure that no loosening has occurred. To prevent rain water or condensation
from running into the sensor, a weatherproof junction box is recommended (Rosemount Analytical PN 22719-02;
see Figure 2-8). The sensor cable must be run through a protective conduit for isolation from electrical interference
or physical abuse from the process. The sensor should be installed within 80° of vertical, with the electrode facing
down. The sensor's cable should not be run with power or control wiring.
NOTE
LARGE PIPE WRENCHES MUST NOT BE USED TO TIGHTEN THE SENSOR INTO
MOUNTING ACCESSORIES.
When the Model 399VP is installed using a 1 in. standpipe, the sensor can be cleaned while still submersed in the
process by using a jet spray cleaner. The jet spray cleaner (PN 12707-00; see Figure 2-7) can spray water or air
directly onto the sensor.
7
FIGURE 2-5. MODEL 399VP WITH INSERTION
ADAPTER (PN 23242-02)
The Insertion Adapter mounts Model 399VP
into a 1-1/2 inch NPT process pipe.
Unscrewing the hex nut allows easy sensor
removal without twisting the sensor cable.