Thermo Scientific Orion Star LogR™ Meter User Guide
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Advanced Orion Star LogR Meter’s Electrode Diagnostics
slope degradation, and reduced immunity to noise. By keeping track of the change
in resistance (delta, as listed in the log example below), this information may be
used to determine when to replace your electrode, before failure occurs, eliminating
down time.
Large decreases in resistance –
When the glass pH membrane resistance is more
than ten times lower than the expected resistance value (at a given temperature),
it is often an indication of membrane crack in the bulb or shorting, leading to a
total failure in function. If you see this type of change in the resistance reading, no
further testing or care will resolve the problem. A new electrode will be needed at
this point.
Increases in resistance –
As the electrode ages, the resistance of the electrode’s
glass bulb increases. Eventually, the aging of the electrode, and visible increase in
resistance, manifests in a slower response rate, low slope, and reduced immunity
to noise. At some point the resistance becomes “super high”. The Orion Star LogR
meter’s diagnostics help you pinpoint the causes of your reduced performance and
quickly show you the effectiveness of your cleaning and care processes.
• If the resistance values are not out of expected range, but electrode response
continues to be slow or erratic, these effects may also be seen as a result
of reference clogging or contamination. You should reference the additional
electrode care notes below.
• If the resistance value between checks increases substantially higher, the fill
solution may be depleted. Refer to the additional electrode care notes below for
the proper fill solution levels of a refillable electrode.
• If the resistance values show a “super high” resistance, cleaning and care
may improve performance, but will not be able to return the probe to like new
condition. Consider purchasing a new electrode.
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