38
MENU
11.1.1. Probe Calibration Mode
Navigation:
• From Main Menu, use the
keys to move to Channel.
• With Channel selected, press
CAL,
to enter calibration.
Calibration mode allows users to calibrate the installed probe.
Note:
See Probe Settings section for TempOffset section.
11.1.1.1. pH Calibration (pH Probes)
The electrode should be calibrated:
• Before installation
• Whenever the pH probe is replaced
• When higher accuracy is required
• After periodic maintenance
• After calibration TimeOut has expired
Preparation Guidelines
Calibrations performed in standard buffers follow the preparation guidelines detailed below.
• Pour a minimum 50 mL of the buffer solutions into clean beakers. If possible, use plastic beakers
to minimize any EMC interferences.
• For accurate calibrations and to minimize cross-contamination, use two beakers for each buffer
solution: one for rinsing the probe and one for calibration.
• Select required calibration buffer group. See Probe Settings section.
• Up to three pH buffers may be used for a calibration. At least two buffers are required to determine
a pH slope.
Note:
It is recommended to select buffers that bracket the expected process pH.
HI510
process controller allows two types of calibration procedures:
•
Standard calibrations − calibrations performed in standard buffer solutions
•
Process calibrations − available only if the probe has been calibrated in buffers previously
Standard Calibration
One-, two- or three-point calibration can be performed using one of the buffer solutions selected from
one of the two groups:
• Hanna Instruments buffers set: 1.68, 4.01, 7.01, 10.01, 12.45 pH
• NIST buffers set: 1.68, 4.01, 6.86, 9.18, 12.45 pH
