YOKOGAWA WE440, User Manual

Page: 27 / 67

<3. Startup and Operation>
3-2
IM 12Y18A04-01EN 1st Edition : Oct. 04, 2019-00
3.2 In Auto-Calibration Mode
The system will run a second calibration cycle if the first calibration result was outside the user
specified tolerance. If the second calibration result is still outside the specified tolerance limits,
the analyzer will continue to use the previously stored calibration and will flash the “CHK CAL”
message in the Info section of the LCD screen.
The “CHK CAL” message can be cleared by resetting the fault alarm under:
VIEW DATA AND ALARMS → REVIEW/RESET ALARMS
Or by running a manual calibration.
3.3 Placing the Analyzer into Service
Your analyzer is now ready for routine operation. To place the analyzer into routine service, press
the control panel RUN key.
The analyzer typically runs unattended, analyzing sample streams and calibrating itself at regular
intervals. All relevant parameters were programmed at the factory based upon your application.
Consequently, the analyzer is fully prepared for routine operation once you complete these
startup procedures.
A qualified and authorized user can change many of the operating parameters through the
password-protected “Technician Level” menu as detailed in the USER INTERFACE menu.
3.4 Validating a Calibration Standard
You can check the analyzer’s calibration accuracy at any time using the validation function.
Validation consists of running a single measurement cycle and reporting the result in
concentration. This reported result can then be compared to the expected value, which is the
known concentration of the validation solution, to determine the accuracy of system calibration.
The advantage of using this function over the Run Analysis function is that prior knowledge of
the concentration allows for validating the accuracy of the analyzer, without affecting the data
reporting to your control center or device.
NOTE
Running a validation is identical to running an analysis: Although the results are printed they are
not stored, alarm conditions are not tested, and the analog outputs are not updated.
It is highly recommended to allow the WE440 Phosphate Analyzer to complete its measurement
cycle rather than using the STOP key. If the STOP key is pressed before a measurement cycle
is complete, it is highly recommended to perform both the AUTO PRIME ALL and CLEAN
sequences described in Chapter 3.
3.5 Running an Analysis (Analyze Once)
Although the analyzer is usually set up to analyze sample streams on a regular schedule, you
may wish to execute an analysis on command to obtain an immediate result. This function allows
you to run single or multiple analyses on a sample without requiring that the automatic mode be
initiated. The analyzer then runs the specified number of analyses, tests for alarm conditions,
exercises the analog outputs, and prints the results exactly as if it were in the automatic mode.
To run multiple analyses (more than one) set the number of repeats in ANALYSIS menu:
Press MENU → SETUP → (+) to go to page 2 → ANALYSIS PARAMETERS → ENTER →
select NO. OF REPEATS