Hanna Instruments HI 98194 Instruction Manual

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Hanna Instruments HI 98194 Instruction Manual Manual pdf 31 page image

6160APPENDIX A - PROBE MAINTENANCEThe HI 7698292 probe maintenance kit includes HI 7042S (electrolyte solutionfor D.O. sensor), spare membranes with o-rings for D.O. sensor, a small brushfor cleaning EC , o-rings for sensor connectors and a syringe with grease tolubricate these o-rings.General Maintenance• Inspect all sensor connectors for corrosion and replace sensors if necessary.• Inspect sensor o-rings for nicks or other damage and replace sensor if necessary.Lubricate only with grease from kit.Use only the supplied grease as some lubricants can cause theo-rings to expand or affect the turbidity calibration standards.• After prolonged storage or cleaning, calibration of the sensors is required.• After use rinse the probe with tap water and dry it. The pH electrode bulb mustbe kept moist. Dry the D.O. and EC sensors.• Check GLP data under “Status” to ensure the sensor is still functioning properly.pH and pH/ORP Sensor Maintenance• Remove the sensor protective cap. Do not be alarmed if any salt deposits arepresent. This is normal with pH/ORP electrodes and they will disappear whenrinsed with water.• Shake down the sensor as you would do with a clinical thermometer to eliminateany air bubbles inside the glass bulb.• If the bulb and/or junction are dry, soak the electrode in HI 70300 storagesolution for at least one hour.• To ensure a quick response time, the glass bulb and the junction should be keptmoist and not allowed to dry. Store the sensor with a few drops of HI 70300storage solution or pH 4.01 buffer in the protective cap. Tap water may also beused for a very short period (few days).Never use distilled or deionized water to store pH sensors• Inspect the sensor for scratches or cracks. If any are present, replace the sensor.• Cleaning procedure: clean the sensor frequently by soaking it for 1 minute inHI 70670 or HI 70671 cleaning solution. After cleaning soak the sensor inHI 70300 storage solution before taking measurements.• ‘’Warning x’’: Any other warning that appears at power-on is identified usinga numeric code. Restart the meter. If the problem persists, contact theHANNA service center. Some meter/probe features can be accessed butwith no guarantee.• ‘’Errors x’’: Any critical errors that appear are identified using a numeric code,and the meter is automatically switched off. Contact the HANNA servicecenter.