AMI INSPECTOR pH
Product Description
A-96.250.761 / 161017 7
2. Product Description
This chapter contains technical data, requirements and perfor-
mance data.
2.1. Description of the System
The portable AMI INSPECTOR instrument is a complete monitoring
system mounted on a small panel with supporting stand and a re-
chargeable battery for stand-alone operation (>24h), designed as
an inspection equipment for quality assurance of online process
monitors.
pH Measuring
Principle
(simplified)
The pH measurement is based on a voltage measurement. A volt-
age can only be measured between two different potentials, there-
fore, the pH measuring chain contains a measuring electrode and a
reference electrode. The reference electrode maintains a constant
potential whereas the potential of the measuring electrode changes
with the pH value. The voltage which results from this potential dif-
ference is measured and displayed on the transmitter as pH value.
The measuring chain is designed so that the voltage is zero at
pH 7.
pH Electrode The Swansensor pH SI is a combined electrode with liquid electro-
lyte (KCl) for the measurement of pH.
Features General Features of AMI INSPECTORs are:
Battery life after full charge:
– >24h at full load (use of 3 relays, USB, signal output, logger)
– >36h at minimum load (use of logger only)
Charging time: approx. 6 hours
Controlled shut-down if battery is empty.
Display of remaining battery life in hours.
For longer battery life the back light of the LC Display is dis-
abled.
Continuous operation using power adapter. The battery
should be discharged at least once a month (normal usage
until the monitor automatically shuts down).
Battery The Li-Ion battery is located in the housing of the AMI transmitter.
See chapter Power Supply, S. 19 regarding power supply and
charging of the battery.
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