8
2.2.1 Flow Through and Insertion Mounting for Models
396, 396VP, 398, and 398VP.
The Models 396, 396VP,
398, and 398VP Sensors can be used with a 1 inch
MNPT process connector at the front of the sensor for
mounting into a 1-1/2 inch tee or the process. See
Figure 2-1 for installation configurations.
2.2.2 Submersion Mounting for Models 396, 396VP,
398, and 398VP.
The Models 396, 396VP, 398, and
398VP Sensors also have a 1 inch MNPT process con-
nector available for use on the back of the sensor.
Tapered pipe threads in plastic fittings tend to loosen
after installation. It is therefore recommended that Teflon
tape be used on the threads and that the tightness of
the connection be checked frequently to assure that no
loosening has occurred. To prevent rain water or con-
densation from running into the sensor, a weatherproof
junction box is recommended (see Figure 2-4). 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 con-
trol wiring.
2.2.3 Quik-Loc Mounting for Model 397.
The Quik-
Loc mounting is used with the Model 397 TUpH sen-
sor only.
SAFETY WARNING
It is recommended that a thermome-
ter, drain valve to relieve pressure
and pres-sure gauge be inserted
near the Quik-Loc assembly (see
Figure 2-5).
WARNING
Once the Quik-Loc unit is installed the oper-
ator should wait for the process to cool to a
safe temperature, use the pressure drain
valve to relieve all process pressure and
observe the pressure on the pressure
gauge for proper removal of the sensor
without spray or bodily injury. The Quik-Loc
kit used with the 397 TUpH sensor is not
recommended for use with hazardous, cor-
rosive, or strong oxidizing chemicals due to
a risk of spray or bodily injury.
MODEL 396/396VP/397/398/398VP
SECTION 2.0
INSTALLATION
2.1 UNPACKING AND INSPECTION.
Inspect the out-
side of the carton for any damage. If damage is detect-
ed, contact the carrier immediately. Inspect the instru-
ment and hardware. Make sure all the items in the pack-
ing list are present and in good condition. Notify the fac-
tory if any part is missing. If the sensor appears to be in
satisfactory condition, proceed to Section 2.2,
Mounting.
NOTE
Save the original packing cartons and
materials as most carriers require proof of
damage due to mishandling, etc. Also, if it
is necessary to return the instrument to the
factory, you must pack the instrument in the
same manner as it was received. Refer to
Section 6 for return instructions. If the sen-
sor is to be stored, the vinyl boot should be
filled with pH buffer solution and replaced
on sensor tip until ready to use.
WARNING
Glass electrode must be wetted at all times
(in storage and in line) to maximize sensor
life.
2.2 MOUNTING.
Each sensor has been designed to
be located in industrial process environments.
Temperature and pressure limitations must not
be exceeded at any time. A caution or warning label
regarding this matter is attached to each sensor. For
insertion, transfer the label as shown on label instruc-
tions. See Figure 2-2. For submersion applications, first
note limits then remove and discard label.
NOTE
Before mounting the sensor, shake down
the sensor to remove any air bubbles that
may be present at the tip of the pH glass
bulb. In most cases, the pH sensor can sim-
ply be installed as shipped and readings
with an accuracy of ±0.6 pH may be
obtained. To obtain greater accuracy or to
verify proper operation, the sensor must be
calibrated as a loop with its compatible ana-
lyzer or transmitter.
SECTION 2.0
INSTALLATION
Summary of Contents for 396
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