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Section 6 Sample measurement
The procedure that follows is applicable to meters that can connect to Intellical pH probes. Refer to
the applicable meter documentation for meter operation and probe-specific settings.
6.1 Sample requirements
N O T I C E
Make sure that the sample type is compatible with the probe, or probe damage can occur.
• Do not use force to push the probe into samples. Use a stainless steel rod to make a hole in the
sample, then put the probe into the hole.
• Do not use the probe to measure samples where glass is not permitted.
• Probes with a Ag/AgCl reference system and single junction are not compatible with solutions that
contain silver complexing or binding agents (e.g., TRIS, proteins and sulfides). To measure in
these solutions, use a double junction probe, a probe with a Ag+ (silver ion) barrier or a Red Rod
probe.
• Proteins can collect on the sensing element. Make sure that the probe stays clean if proteins are in
the sample.
• Do not measure samples that are hotter or colder than the specified operating temperature of the
probe. Refer to Specifications on page 3.
6.2 Sample measurement notes
Read the notes that follow before sample measurements.
• Rinse the probe with deionized water and dry with a lint-free cloth between measurements to
prevent contamination.
• For faster stabilization, soak the probe for 3 or more minutes in the sample before measurements.
• If complete traceability is necessary, enter a sample ID and operator ID before measurement.
Refer to the meter manual for instructions.
• The meter automatically saves the measurement data when the user manually reads each data
point and when the meter is set to read at regular intervals. The user must manually save each
data point when the meter is set to read continuously.
• Air bubbles below the sensor can cause a slow response or error in the measurement. Make sure
to remove air bubbles before and during measurements.
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