HF scientific MicroTUV Online UV %Transmission Analyzer - Manual (Page 11)

TUV (1/03)
REV. 0.2
3.1 START UP
NOTE: It will be necessary to verify each of the user settings, in the Analyzer, and/or change some,
when starting the unit for the first time.
The Analyzer screen should respond per the Menu Guide. Refer to Figure 5. While the screen of the Analyzer
will start to indicate the % Transmission until the system is calibrated, the reading may not be accurate. After
at least one hour warm-up (with the Sensor/Sampler enclosure closed) go to Main Menu, and from there
to Utility (F3), and from there to Calibrate (F3), and finally, Do Both (F4). At this time the Analyzer will
cause the sensor to calibrate by checking the 100%T adjustment and dark setting of the Sensor module. This
process will take a few minutes to complete. Press MENU to go to Utility Menu. Press Timed Cal (F4)
to observe that 000 hours Since Last Cal. has been posted properly. Set the calibration period XXX Hours
Between Cal. to the desired period. From now on the Hours Since Last Cal. will ascend until it reaches the
value of Hours Between Cal., at which time the Analyzer will automatically initiate a “Do Both” calibration
and reset the Hours Since Last Cal. to zero. Obviously, the longer the interval between calibrations, the
longer the 100%T solution will last.
When the 100%T solution has been exhausted, depending on the user selected setting, one of two things will
happen. See section 4.2 Calibration Alarms.
Press MENU and the screen will return to the Utility Menu. At this time you may want to Set Time (F2)
or adjust the Screen Brightness (F1). When you are satisfied with all settings, press the menu button and
the Main Menu will be displayed. Press %T (F4), and the system will go into the on-line measurement mode.
4.0 CALIBRATION
The Sensor/Sampler requires calibrations occasionally to adjust for debris buildup on the cuvette. Calibrations
are initiated by periods set in the Analyzer, usually every 24-48 hours. A calibration consists of a dark reading
and a 100%T reading. Dark readings set the low end of the readable scale and 100%T calibrations set the upper
end.
4.1 100%T CALIBRATION
This calibration can be performed automatically, or manually. Both operations are initiated at the analyzer.
During a 100%T calibration the solenoid/valve will switch the source of fluid supply from the effluent sample,
to the 100%T water. It will pump this water for a predetermined time and then shut the pump down. During
this shutdown period the Sensor/Sampler’s CPU will perform several calibrations and will adjust its gain to
the amount of signal available dependant on the condition of the optical path (debris or contaminant on the
cuvette walls). The solenoid/valve will then return to providing the sample to the pump intake and the pump
will restart. At this time the Sensor/Sampler is returned to normal on-line operation.
4.2 CALIBRATION ALARMS
The operator may select how the analyzer will respond to running out of 100% T water during a calibration.
In The Pump/Alarm Control Menu select either:
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