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
A.
Temperature Extremes.
Solutions in excess of 160F/71C should not be placed in the cell cup area; this may cause damage. The pH sensor may
fracture if the Ultrameter temperature is allowed to go below -10C (14F). Care should be exercised not to exceed rated
operating temperature.
Leaving the Ultrameter in a vehicle or storage shed on a hot day can easily subject the instrument to over 150F. This will
void the warranty.
B.
Battery Replacement
Dry Instrument THOROUGHLY. Remove the four (4) bottom screws. Open instrument carefully, it may be necessary to
rock the bottom slightly side to side to release it from the RS-232 connector. Carefully detach battery from circuit board.
Replace with 9 volt alkaline battery. Replace bottom, ensuring the sealing gasket is installed in the groove of the top half of
case. Re-install screws, tighten evenly and securely.
NOTE: Because of nonvolatile EEPROM circuitry, all data stored in memory and all calibration settings are protected even
during power loss or battery replacement.
C.
pH/ORP Sensor Replacement
Order model RPR. When ordering, be sure to include the model and serial number of your instrument to ensure receiving
the proper type. Complete installation instructions are provided with each replacement sensor.
D.
Cleaning Sensors
1.
Conductivity/TDS/Resistivity
The conductivity cell cup should be kept as clean as possible. Flushing with clean water following use will prevent buildup
on electrodes. However, if very dirty samples, particularly scaling types are allowed to dry the cell cup, a film will form.
This film reduces accuracy. When there are visible films of oil, dirt, or scale in the cell cup or on the electrodes, use a
foaming non-abrasive household cleaner. Rinse out the cleaner and your Ultrameter is ready for accurate measurements.
2.
pH/ORP
The unique pH/ORP sensor in your Ultrameter is a non-refillable combination type which features a porous Teflon* liquid
junction (covered by U.S. Patent No. 4128468). It should not be allowed to dry out. If it does, the sensor can sometimes be
rejuvenated by first cleaning the sensor well with a liquid spray cleaner such as Windex or Fantastic , to clean it. The
sensor bulb is very thin and delicate. Do not scrub or wipe the pH/ORP sensor.
Then use one of the following methods:
Pour a HOT salt solution ∼60C (140F), preferably potassium chloride (KCL) solution . HOT tap water with table salt
(NaCl) will work fine in the sensor well and allow to cool. Retest.
Or
Pour DI water in the sensor well and allow to stand for no more than 4 hours (longer can deplete the reference solution and
damage the glass bulb). Retest. If neither method is successful, sensor must be replaced.
"Drifting" can be caused by a film on the pH sensor bulb. Spray a liquid cleaner such as Windex or Fantastic into the
sensor well, to clean it. The sensor bulb is very thin and delicate. Do not scrub or wipe the pH/ORP sensor.
Leaving high pH (alkaline) solutions in contact with the pH sensor for long periods of time can damage it. Rinsing such
liquids from the pH/ORP sensor well and refilling well with storage solution, or at least one of the following; a saturated
KCL solution or salty tap water will extend the sensors useful life.
