Hach H160, Руководство пользователя

Страница: 40 / 52

Maintenance
38
• Clean any reference gel off the probe sensor AND out of the rubber dust cap’s
inside surface.
• Soak the new probes or probes that have been stored for an extended time for
at least 10 minutes in pH 7 prior to use.
• Store the ISFET pH Probes in dry storage when not in use.
Note: New probes may have gel visible at the probe tip. This is normal. Remove gel by gently
cleaning with a soft toothbrush and soapy water. Be sure to clean gel from the inside of the
rubber cap before replacing. Gel may reappear for several days.
7.1.1 Calibrate and verify
• Calibrate the probe. Begin with pH 7 buffer, then go to the second buffer
(usually pH 4 or pH 10) and to additional buffers.
• Check the calibration by placing the probe back into pH 7 buffer. If the reading is
incorrect, the probe is not properly hydrated. Soak the probe for another 5
minutes in pH 7 buffer then repeat the calibration.
7.2 ISFET non-glass probe maintenance
Clean the probe regularly with a toothbrush and mild detergent. Store the probe dry
with the black protective cap covering the probe tip. No electrode storage solution is
required.
7.3 BNC electrode maintenance
• Store the probe in electrode storage solution.
• Always begin each measuring session with at least a two-point calibration.
Update often with one-point, two-point or three point calibrations.
• Use fresh buffers and deionized rinse solution.
• Use buffer solutions with pH values no greater than three pH units apart. Buffers
should bracket the anticipated values of the samples to be measured.
• Use deionized water to rinse residual buffer and sample solutions from the
probe after calibration and measurement.
• Calibrate at the same temperature as the sample solution. Although the meter
has automatic temperature compensation, best results will be achieved if the
calibration buffers and sample are the same temperature.
• Keep the connectors clean and dry. Dirty or damp connectors can cause
unstable readings.