Measuring with EC Probes 136
6. Press m direct key then CAL virtual key.
7. Use ud directional keys to adjust the process value in agreement with the standard value.
8. Press CFM when displayed to confirm and save calibration.
“Wait” is displayed followed by “DONE” when the process calibration is confirmed and saved. The
controller returns to the menu.
Installation recommendations
The HI520 controller together with a HI7630‑28zz probe is designed to meet the ASTM D5391‑ 99 requirements
for electrical conductivity and resistivity of flowing high‑purity water samples.
• The installation must exclude air contact with the sample.
•
Install the probe in a tee, horizontally, and direct the flow into the opening at the bottom of the probe.
Alternatively, the probe can be installed in a flow‑cell.
• Maintain a steady flow rate to minimize interferences from bubbles, settling of particulates, and provide
a faster response.
• The probe is specified up to 6 bar @25 °C.
22.4.5. Clear Calibration
1. From calibration screen, press CLR when displayed.
2. Press Yes to confirm deletion.
3. “Calibration Erased” confirmation screen is displayed and then the controller reenters calibration mode.
4. Press the b (back) key to return to the menu.
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