TM 10-6630-222-12&P
0004 00
OPERATOR AND UNIT MAINTENANCE MANUAL
(INCLUDING REPAIR PARTS AND SPECIAL TOOLS LIST)
FOR WATER QUALITY ANALYSIS SET: PURIFICATION (WQAS-P)
DESCRIPTION AND USE OF CONTROLS AND INDICATORS FOR ULTRAMETER 6P
c.
TDS Key
A press of<TDS> displays Total Dissolved Solids with units on the right. This is a display of the concentration of material
calculated from compensated conductivity using the characteristics of a known material. On the left is shown solution type
selected for TDS. (ref. Solution Selection).
3.
pH and ORP Keys
Measurements are made on solution held in the pH/ORP sensor well. (ref. PH and ORP Measuring). The protective cap is
removed and the sensor well is filled and rinsed with sample enough times to completely replace the storage solution. After
use, the pH/ORP sensor well must be refilled with storage solution, and the protective cap reinstalled securely. (ref.
Maintenance of the pH/ORP Sensor and Cleaning Sensors)
a.
pH Key
A press of <pH> displays pH readings. No units are displayed.
b.
ORP Key
A press of <ORP> displays Oxidation-Reduction Potential/REDOX reading in milli-volts.
4.
CAL/MCLR Key
A press of <CAL/MCLR> allows you to enter the calibration mode while measuring conductivity, TDS or pH. Once in
CAL mode, a press of this key accepts the new value. If no more calibration options follow, the instrument returns to
measuring. (ref. Leaving Calibration). If <CAL/MCLR> is held down for about 3 seconds, CAL mode is not entered, but
"SEL" appears, to allow solution selection with the Up or Down keys. As when in calibration, the CAL key is now an
"accept" key. While reviewing stored records, the MCLR side of the key is active, to allow clearing records.
5.
UP or DOWN Keys
While measuring in any parameter, the < /MS> or < /MR> keys activate the Memory Store and Memory Recall
functions. While in CAL mode, they step or scroll the displayed value up or down. A single press steps the display and
holding either key scrolls the value rapidly. While in Memory Recall, they move the display up and down the stack of
records.
AFTER USING THE ULTRAMETER
A.
Maintenance of the Conductivity Cell
Rinse the cell out with clean water from the demineralizer bottle*. Do not scrub the cell. For oily films, squirt in a
foaming non-abrasive cleaner and rinse. Even if a very active chemical discolors the electrodes, this does not affect the
accuracy; leave it alone. (ref. Cleaning Sensors).
NOTE
Shelf-life of demineralizer depends on when bottle is opened/used and expiration is determined by color of beads
B.
Maintenance of the pH/ORP Sensor
The sensor well must be kept wet with a solution. Before replacing the rubber cap, rinse and fill the sensor well with (in
order of preference): storage solution, an almost saturated KCL solution, pH 4 buffer or at least a strong table salt solution.
Not distilled water. (ref. pH and ORP Practices).
SPECIFIC RECOMMENDED MEASURING PROCEDURES
If the proper solution is not selected (KCL, NaCl, 442 or USER) see Solution Selection.
NOTE: After sampling high concentration solutions or temperature extremes, more rinsing may be required. When
sampling low conductivity solutions, be sure the pH cap is well seated so no solution washes into the conductivity cell from
around the pH cap.
A.
Measuring Conductivity/Total Dissolved Solids (TDS)
1.
Rinse cell cup 3 times with sample to be measured. (This conditions the temperature
compensation network and prepares the cell).
0004 00-3
