Maintenance - Hanna Instruments PCA 311 Instruction Manual

MAINTENANCE

The PCA 311, PCA 321 and PCA 331 analyzers incorporate
several technologies to minimize the maintenance.
Also, if the GSM module is connected, the warnings, alarms
and errors are sent to the operator, making the maintenance
even simpler.
The analyzer status could be sent via SMS messages after a
call from operator.
Calibration of the bromine measuring circuits is not normally
required. The DPD technique for measuring bromine
concentration is well established and consistent. Also,
by measuring the sample blank absorbency to establish the
zero reference with each measurement, the accuracy of the
analyzer is assured.
If, for any reason, the Bromine measurements are inaccurate
proceed with the calibration procedure.
A visual check of the hydraulic compartment can detect leaks,
pump tubing fatigue or breakage. These periodic checks help
ensure reliable analyzer performance.
PCA 311-331 analyzers warning the user when the reagents level
reaches approximately 20% with the "Low reagent" message.
Working at maximum capacity (3 minutes sampling rate), the
analyzers can operate for 1.5 more days.
The alarm system is based on an internal counter that has to
be reset every time the reagents are replaced.
The counter keeps track of the number of measurements taken
and informs the user when it reaches the 16000th sample with
the message "No reagent".
The pH, ORP and Temperature measurements are done with
standard techniques that assure reliability and accuracy.
However if a problem occurs on those measuring channels,
an SMS is sent to the user.
Furthermore, if the relation between bromine, pH and ORP is
known for a certain application, one of those readings could
be used to check the others, for example check the bromine
and pH by reading the ORP values.
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