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MODEL 320HP
MAINTENANCE AND TROUBLESHOOTING
4.1 GENERAL
This section contains the scheduled preventative mainte-
nance and troubleshooting for the sensor. The intent of this
section is to furnish the user with the information necessary
to maintain his own equipment by providing a maintenance
schedule and troubleshooting guide.
4.2 SCHEDULED PREVENTATIVE
MAINTENANCE
Regular scheduled maintenance of the sensor should be per-
formed to keep the sensor in good operating condition. The
time periods shown may need to be varied according to the
user's particular operating conditions.
4.2.1 Maintenance Every 30 Days.
Make sure the sample line has been shut off
from the system prior to removing the electrode
or reference cover.
A. Electrode Cleaning.
1.
Shut off the sample flow and drain the flow cell to
remove the hydrostatic seal.
2.
Remove the electrode assembly by unscrewing the
electrode housing gland nut and pulling the electrode
straight out. Clean the electrode with a soft lint-free cloth
or tissue. If this does not remove all accumulated
deposits, wash the electrode in a 5% hydrochloric acid
solution and then rinse with water.
3.
Check the o-ring for deterioration or deformation and
replace if necessary.
4.
Before reinstalling the electrode, apply o-ring lubricant
(PN 2001928) to the o-ring. Care must be taken to pre-
vent lubricant from contacting the measuring tip as this
will interfere with the sensor's operation.
5.
Position the o-ring on the gland fitting and insert the
electrode (with washer and gland nut) into the gland.
Tighten the gland nut. Do not use tools.
B. Reference Cell.
1.
Check the level of the salts by looking through the clear
window on the back of the reference cell. If less than 1/2
of the cell has a crystalline structure (or if the electrolyte
is completely clear), the reference cell needs recharg-
ing.
2.
If the reference needs recharging, turn the reference
cell to unlock it from the bracket, then pull straight out.
Remove the junction.
12
SECTION 4.0
NOTE
MAINTENANCE AND TROUBLESHOOTING
3.
Empty the electrolyte from the reference cell and flush it
with deionized water.
4.
PIace the reference cell on a flat surface, window side
down. Add deionized water to half fill the cell. Slowly
add new crystals (PN 9210243) until approximately 90%
full. Top off with deionized water, insuring that no air is
entrapped.
5.
Replace the foam junction. Use o-ring lubricant (PN
2001928) on the reference cell's process o-ring and
position the reference cell onto the flow cell.
6.
Secure the reference cell to the flow cell by turning the
cell until it is locked in place to the flow cells brackets.
7.
Calibrate the sensor and analyzer as described in
Section 3.2.
4.2.2 Maintenance Every Year.
Make sure the stream line has been cut off from
the system prior to removing the electrode or
reference cover.
A. Electrode Cleaning. Refer to Section 4.2.1, A for instruc-
tions.
B. Reference Cell.
1. Remove the reference cell from the flow cell by unlocking
it from the bracket and pulling the cell straight out.
2. Remove the liquid junction and the microjunction.
Remove the eight screws that hold the reference cell
cover in place. Separate the cover from the reference cell
body.
3. Discard all liquid or slurry material from the reference cell.
Thoroughly clean the reference cell body and cover. Hot
water may be used to remove any caked on salts.
4. Carefully remove both o-rings from the reference cell
assembly. Clean the grooves of any foreign material and
salts. Carefully inspect the o-rings for nicks, cracks or flat-
ness and replace if needed (see Figures 5-1 and 5-2 for
part number).
5. Dry the grooves and install the o-rings, lightly coated with
o-ring lubricate (PN 2001928).
6. Install a new-microjunction (PN 22994-00 ). Recharge the
flow cell as described in Section 4.2.1.
7. Install a new liquid junction (PN 2001317). Do not use
pipe dope or thread sealant. If required, Teflon tape may
be used to provide a tighter fit.
8. Calibrate the sensor and analyzer as described in
Section 3.2.
SECTION 4.0
NOTE
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Troubleshooting
