Myron L 729II - Manual (Page 63)

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4. TRANSFER STANDARD METHOD
For maximum accuracy of any Monitor/controller, the transfer
standard method should be utilized. Instead of removing the
entire Monitor/controller and sensor, and either returning it to the
manufacture or sending it to a third party laboratory for recer-
tification, the transfer standard allows quick recertification and
return to service — less down time. While being the most ac-
curate method it is also very easy to perform, and may be used
to calibrate ANY manufacture Monitor/controller — resistivity or
conductivity/TDS. This method still has the benefit of third party
verification, if so desired.
1. A high quality hand-held instrument, one capable of
accurate conductivity/TDS and/or “resistivity” readings
such as the Myron L Ultrameter II™, is calibrated using a
standard solution, or if so desired, sent to a third party
laboratory for calibration & certification. Preferably the
standard solution should be as close as practicable
to the area of the Monitor/controller operation, i.e. for
a conductivity Monitor/controller that is operating
between 1500 and 2000µS, the recommended Myron L
standard solution is KCl-1800.
NOTE: For resistivity values, the Myron L Company can supply
NaCl standards as low as ~25µS on special order. Extremely low
values are available from other sources. Calibrated at 25µS the
Ultrameter II is capable of very accurate resistivity measurements.
2. Once the Ultrameter II is calibrated, the process water
is measured. (For resistivity measurements, follow the
recommended procedure described in the Ultrameter II
Operation Manual, section IV.B, Measuring Resistivity.)
3. Finally, the Monitor/controller is calibrated/adjusted to
match the value measured by the Ultrameter II by
adjusting the Main CALibration control shown in
figure V.A.1.
4. Turn power OFF.
5. Re-install front panel as described below in
“REASSEMBLY”.
REASSEMBLY
1. Carefully reinstall the front panel, bottom first.
Ensure no wires have been pinched between
enclosure and front panel.
2. Reinstall the four (4) screws and tighten.
3. To operate, turn power ON.
D. PREVENTIVE CARE
The Myron L Company recommends that the following
Preventive Care procedures be observed.
1. Try to prevent exposure to excessive heat and moisture.
2. The Monitor’s main AC power source should be protected
against excessive voltage “spikes.”
3. Take care not to damage the Monitor during handling.
NOTE: Daily, weekly or monthly maintenance schedules are
based upon the frequency of use and the severity of the
Monitor’s environment and operating conditions.
4. Repeat the Monitor’s Check-Out procedures to verify
satisfactory operation and/or isolate possible
troubleshooting symptoms.
5. Check all cable connections to ensure that they are
free of moisture and contamination.
6. Inspect and replace damaged component boards and
cable assemblies.
7. Periodically remove, clean and inspect the Sensor.
CLEANING - clean front panel with soap and water, and
soft non-abrasive cloth.