Amprobe WT-30 Manual De Uso página 11

P4.1: Range 1 calibration info:
In P4.0, press "SET" to enter P4.1 and review the
last calibration concentration. If the meter is not
yet calibrated, "---" will display on the LCD. The
calibration information will be override after
recalibration.
P4.2: Range 2 calibration info:
In P4.1, press "p" to enter P4.2 and review the
last calibration concentration. If range 2 is not yet
calibrated, "---" will display on LCD. In P4.1 or P4.2,
press "SET" to return to P4.0.
Calibration Mode (CAL)
Selecting a calibration standard
For best results, select a NaCL solution which is near the
sample value you are measuring. Alternatively, use a
calibration solution value which is approximate 2/3 of
the full scale of the measurement range you plan to use.
For example, in the 10.1 to 70.0 ppt range, use 47 ppt
solution for calibration.
DO NOT reuse the calibration solution. Contaminants in
the solution will affect the calibration and the accuracy.
When to do the calibration?
Calibration is necessary and should be done regularly.
If measure the mid-ranges, calibrate the meter at least
once a month. Soak the probe for 15 mins before
calibration or measurement can saturate the probe
surface and minimize drift.
If measure the extreme temperatures or special
concentration (<0.1ppt or >5ppt), calibrate the meter at
least once a week to get specified accuracy.
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