Nova-Tech pH 700 Ion 700 - Manual (Page 6)

3. CALIBRATION
3.1 pH Calibration
For best results, periodic calibration with known accurate standards is
recommended. Calibrate with standards that bracket your intended
measuring range while including a neutral standard (pH 7.00 or 6.86).
For example, if you expect to measure samples from pH 6.2 to pH 9.5,
calibration with 4.01, 7.00, and 10.01 will work well.
The 700 series meters can be calibrated with up to 5 buffers. The
non-volatile memory retains all calibration values upon meter shut down.
The following calibration standards are automatically recognized;
USA buffer group 1.68, 4.01, 7.00, 10.01, 12.45
NIST buffer group 1.68, 4.01, 6.86, 9.18, 12.45
See Section 5.6 to change the buffer group
To eliminate temperature errors associated with the pH electrode, attach
the automatic temperature compensation (ATC) probe for best accuracy.
Without temperature compensation, pH accuracy will worsen as samples
deviate from 25ºC and pH 7.
1) Press as needed to select pH.
2) Dip the pH and ATC electrodes into pH buffer and press . The
secondary display will lock on the appropriate buffer value. Provide
stirring for best results. When the READY indicator appears, press
to accept. The primary reading will flash briefly before the secondary
display begins scrolling the remaining available buffers.
3) Rinse the pH and ATC electrodes then dip into the next pH buffer. The
secondary display will lock on the appropriate buffer value. When the
READY indicator appears, press to accept. The primary reading
will flash briefly then display the percent efficiency (slope) before the
secondary display begins scrolling the remaining available buffers.
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