Myron L 6Pfc and 4P User Manual

Page 19

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15

VII. CALIBRATION

A. Calibration Intervals

Generally, calibration is recommended about once per month with

Conductivity or TDS solutions. Calibration with pH solutions should

be checked twice a month. Calibration of ORP is not necessary (ref.

CaLIBRaTION INTERVaLS, pg. 20).

B. Rules for Calibration of the Ultrameter II

1. Calibration Steps

a. Starting Calibration

Calibration is begun by pressing while measuring Conductivity, TDS

or pH. Measuring continues, but the “CAL” icon is on, indicating

calibration is now changeable.

The reading is changed with the and keys to match the known value.

The calibration for each of the 4 solution types may be performed in

either conductivity or TDS mode.

Depending on what is being calibrated, there may be 1, 2 or 3 steps to

the calibration procedures.

KCl, NaCl or 442

User

Cond Gain only

Tempco, then Gain

Res

Done in conductivity

Done in conductivity or TDS

TDS Gain only

Tempco, Ratio, then Gain

pH

7, acid and/or base (6Pfc)

ORP Zero set with pH 7 automatically (6Pfc)

Once in CAL mode, the

key becomes an “ACCEPT” key. At

each point, pressing

accepts the new calibration value and steps

you to the next adjustment (or out of CaL mode if there are no more

steps).
To bypass a calibration step, simply press

to accept the present

value as is.

b. Leaving Calibration

Calibration is complete when the “CAL” icon goes out. Pressing any

measurement key cancels changes not yet accepted and exits calibration

mode.
Leaving pH after the 2nd buffer results in the same gain being entered

in place of the 3rd buffer.

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