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7070iX TRO Analyzer
Measurement
By selecting Measurement from the Main Menu the following
screen will appear.
Figure 11. Measurement Screen
Calibrate
Calibrate allows the operator to calibrate either the TRO
sensor or the temperature sensor.
The analyzer calibrates using standards with a known chlorine
equivalent by setting the monitor using known values. During
calibration, the three-way valve is used to switch flow from the
sample to the standards line. Two standards are used to
adjust the electronics for the actual slope of the electrode
much the same manner that two buffers of different pH are
required to calibrate a pH meter. Chlorine solutions are
unstable and are not suitable for use as standards.Therefore,
stock solutions of potassium permanganate, which are stable
and react with iodide to produce iodine are used. Standards
prepared are stoichiometrically equivalent to the chlorine
concentrations indicated. For detailed calibration procedures,
please refer to
Startup and Operation
.
Validation / Grab Sample
This option allows for the validation of a known standard or
the measurement of a sample using the standards lines.
Prime Reagent
After changing reagent, select this option to prime the reagent
pump.
Replace Reagent
After replacing the reagent, select this item to reset the
Reagent remaining hours.
Reagent Remaining
This item shows the hours of reagent remaining. This time
changes, only when the reagent pump is running or is reset
by the “Replace Reagent” selection.
Diagnostics
Select Diagnostics from the Main Menu. The diagnostics
screen shows the options as shown in
Figure 12
.
Figure 12. Diagnostics Main Menu
Table 2. Description of Options
Options
Description
System
Information
•
Display the channel information of
card type
•
Display the measurement in use
•
Display the power and relay
information
Calibration Log
Select to review the stored calibrations
results
Warning List
Contains a description of why the
channel indicator is not green. Red and
yellow Event possibilities are listed in the
Table 3
.
Event Log
This is a log of current and past
occurring Events. The log may also
contain additional information.
Analog Output
Status
Display the mA outputs for the installed
channels
Relay Status
Display the status of relay:
•
Active
•
Inactive
