36
C. Conductivity, RES, TDS, Practices to Maintain Calibration
1.
Clean oily films or organic material from the cell electrodes
with foaming cleaner or mild acid. Do not scrub inside the cell.
2.
Calibrate with solutions close to the measurements you make.
Readings are compensated for temperature based on the
type of solution. If you choose to measure tap water with a
KCl compensation, which is often done (ref. An Example of 2
different solution selections and the resulting compensation,
pg. 57), and you calibrate with 442
TM
solution because it is
handy, the further away from 25°C you are, the more error
you have. Your records of calibration changes will reflect
temperature changes more than the instrument’s accuracy.
3.
Rinse out the cell with pure water after taking measurements.
Allowing slow dissolving crystals to form in the cell
contaminates future samples.
4.
For maximum accuracy, keep the pH sensor cap on tight so
that no fluid washes into the conductivity cell.
D. pH and ORP/Free Chlorine Equivalent Practices to
Maintain Calibration
1.
The sensor well must be kept wet. Before replacing the rubber
cap, rinse and fill the sensor well with Myron L
®
pH Sensor
Storage Solution. Although not ideal, if Myron L
®
Storage
Solution is not available, you can temporarily use a strong
KCl solution, a pH 4 Buffer Solution, or a saturated solution of
table salt and tap water until pH Storage Solution is obtained.
NEVER use distilled water.
2.
Rinse away caustic solutions immediately after use.
ORP calibration solutions are caustic, and ±5% is considered very
accurate. By using the pH zero setting (0 mV = 7 pH) for ORP and
precision electronics for detection, the Ultrameter
III
delivers better
accuracy without calibration than a simpler instrument could using
calibration solutions.
IX.
MEMORY
This feature allows up to 100 readings with their temperatures to be
stored simultaneously for later recall. At the same time, the TIME and
DATE are also recorded. To download the memory to a computer, ref.
bluDock™ WIRELESS DATA TRANSFER INSTRUCTIONS, pg. 47.
A. Memory Storage
1.
While displaying a measurement, press
to record the
displayed value.
Summary of Contents for POOLPRO PS9TKB
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