Myron-l TH1 User Manual download pdf (Page 16)

2. Reloading Factory Calibration (Cond or TDS)

If calibration is suspect or known to be incorrect, and no standard solution

is available, the calibration value can be replaced with the original factory

value for that solution. This “FAC” value is the same for all TechPro IIs,

and returns you to a known state without solution in the cell. The “FAC”

internal electronics calibration (which bypasses the electrodes and cell) is

not intended to replace calibration with conductivity standard solutions. If

another solution type requires resetting, change solution type and repeat

this procedure.

a. Press or .

b. Press .

c. Press key until “FAC” appears and release.

d. Press to accept the factory calibration setting.

3. pH Calibration (TPH1 & TH1)

Important: Always “zero” your TechPro II with a pH 7 buffer solution

before adjusting the gain with acid or base buffers, i.e., 4 and/or 10.

a. pH Zero Calibration (TPH1 & TH1)

1. Rinse sensor well 3 times with 7 buffer solution.

2. Rell both sensor wells with 7 buffer solution.

3. Press to verify the pH

calibration. If the display

shows 7.00, skip the pH Zero

Calibration and proceed to

section b. pH Gain Calibration.

4. Press to enter calibration

mode. The “CAL”, “BUFFER” and “7” annunciators will appear

(see Figure 3). Displayed value will be the uncalibrated sensor.

NOTES: If a wrong buffer is added (outside of 6-8 pH), “7” and “BUFFER”

Figure 3

BUFFER

CAL

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Myron-l TH1 User Manual Page 16