Maintenance 14
7. Press
Process
when available.
8. Use
ud
directional keys to adjust the process value in agreement with the standard value.
9. Press
CFM
to confirm and save calibration.
Installation recommendations
The
HI510
controller together with a
HI7630-28
zz
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. See section 8, Installation.
• Maintain 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.
12. MAINTENANCE
Rinse the probe thoroughly as water residue may not be visible.
Cleaning
Dirty or improperly cleaned probes can result in erratic and inaccurate readings.
• Remove and inspect the probe during scheduled service intervals.
• Dry clean the sensor with a soft bristle brush to loosen any debris.
For a more thorough cleaning:
• Use a cloth and warm water with a soapy surfactant to clean and follow with a thorough rinse with
purified (deionized) water. Ensure that the holes and cell channel in the sensor are free of foreign material.
• Flush with purified water after cleaning.
Four-ring probe cleaning
• Remove and inspect the probe during scheduled service intervals.
• Clean off the external sheath with a soft cloth and surfactant solution.
• Rinse the probe under a stream of running tap water to remove salt or minerals.
Jet the tap water stream through the opening to dislodge any debris.
• If strictly necessary, carefully remove the outer plastic sheath to disassemble the probe.
Clean with a warm water/surfactant mixture and follow with a through rinsing with purified water.
Allow pieces to dry and reassemble.
Calibrate the probe with the appropriate buffer for the intended application.
Storage
• Store the probe dry, after cleaning in distilled water.
• Clean the probe and calibrate after long-term storage.
