Nvis901
pH Meter Calibration using pH buffer solution
Nvis 901 pH meter having three point calibration for correcting pH sensor error. For this three buffer
solution of
4pH, 7pH and 9.18pH
is required. The pH buffer solution can be prepared form pH
buffer tabled or by chemical method. However pH buffer tablet are recommended for good accuracy.
Follow the procedure given below for calibration.
1. Clean the pH sensor by distill water and dip pH sensor in distill water for two minutes.
2. Clean the PT100 sensor by distill water. And dip in pH buffer solution with pH sensor.
3. Now prepare pH buffer solution of 4pH, 7pH and 9.18pH in three different clean beaker.(please see
the procedure given on buffer tablet container to how to prepare pH buffer solution).
4. Now on the instrument and dip pH sensor in 4pH buffer solution and then press enter button two
times.
”Dip in 4 pH”
message appear on LCD (Fig 6).
Fig 6
5. Wait for 1 minute and then press
down
button. Instrument start taking reading. After few second
“
Press Up
” message appear on LCD(Fig 7). Now press up key.
Fig 7
6. Now LCD display “
Dip in 7pH
”. Dip pH sensor in distill water for few second (without removing
form instrument). Then dip it in to 7pH buffer solution for
1 minute
and then press
down
button.
Instrument take reading and then message appear “
Dip in 9.18pH”
.
7. Dip pH electrode in distill water for few second (without removing sensor form instrument). Then
dip in to 9.18pH buffer for one minute. Press down button, “
Press Up
” message appear on display.
8. Now press up button. The “
Cal Active
” message come on display second line(Fig 8). To activate
calibration press
Escape
button and for deactivate calibration press down button, “
Cal Deactivate
”
message come on display and then press
Escape
. If calibration deactivate option is selected then
calibration process is not effective.
Nvis Technologies Pvt. Ltd.
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