Hanna Instruments PCA 310 - Manual (Page 65)

65
MAINTENANCE
The PCA 310, PCA 320 and PCA 330 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 chlorine measuring circuits is not normally
required. The DPD technique for measuring chlorine concentra-
tion 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 Chlorine 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 310-330 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. How-
ever if a problem occurs on those measuring channels, an
SMS is sent to the user.
Furthermore, if the relation between chlorine, pH and ORP is
known for a certain application, one of those readings could
be used to check the others, for example check the chlorine
and pH by reading the ORP values.