Calibration - Hanna Instruments HI7630-28 Instruction Manual

Calibration

10. CALIBRATION
HI510 controller allows two types of EC calibration procedures:
• Standard two-point conductivity calibration with standards for cell factor determination:
0.000 µS/cm for offset
84.0 µS/cm, 1413 µS/cm, 5.00 mS/cm,12.88 mS/cm for the 0.1/cm cell
80.0 mS/cm, 111.8 mS/cm additional standards for the 1.0/cm cell
• Standard single point salinity calibration in 100% salinity standard, with the controller set to Sal %
measurement mode after the EC range has been calibrated
• Process single point calibration performed with calibrated probes installed in the process
Standard Calibration
Conductivity (EC)
Preparation
• Always clean the probe in distilled water, shake off water droplets, and allow to dry prior to calibration.
• Suspend the probe in the air, use 0.000 µS/cm as first calibration point.
• Use an EC calibration standard with a value that is close to that of the sample.
• Inspect the probe for debris or blockages.
• Ensure that probe's holes are completely submerged.
• Tap the probe to remove any air bubbles that may be trapped inside the sleeve.
• To minimize cross-contamination, when a two-point calibration is required, use two beakers: one for
rinsing the probe and the other for calibration.
• Go to Probe Settings in Channel Setup and set Meas.Mode to EC.
Procedure
1. Press direct key then CAL virtual key. The probe selection must be set to EC.
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2. Suspend the probe in the air. Allow for the reading to stabilize.
3. Press CFM when displayed. The first calibration point (Offset calibration) is accepted and saved.
4. Press Next to continue with the second point.
5. Raise and lower conductivity cell in rinse beaker of standard, then discard. Immerse the sensor in EC
standard. The controller will automatically recognize the standard. Allow the reading to stabilize.
6. Press CFM to confirm the second point and save the calibration.
Salinity (HI7630-48 series only)
Salinity calibration can be performed with the controller set to Sal % measurement mode after the EC range
has been calibrated.
1. Press direct key then CAL virtual key. The controller enters calibration mode.
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2. Raise and lower conductivity cell in rinse beaker of salinity standard then discard.
3. Immerse the sensor in salinity standard. The controller automatically recognizes the standard. Allow the
reading to stabilize.
4. Press CFM when displayed to confirm and save the calibration.
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