YOKOGAWA WE440, User Manual

Page: 26 / 67

<3. Startup and Operation>
3-1
IM 12Y18A04-01EN 1st Edition : Oct. 04, 2019-00
3. Startup and Operation
Each WE440 Phosphate Analyzer gets thoroughly wet-tested and calibrated at the factory, so the
system is ready to begin analyzing sample streams. The results of this activity are recorded in a
Test Certificate shipped to you with the analyzer.
Since the elapsed time between factory calibration and your startup process is unpredictable, it is
important that you calibrate the analyzer again before you place it in service for the first time.
Please refer to section Calibration for additional instructions on calibrating the analyzer. The
reported result of a calibration is a number that the analyzer uses to determine the sample
concentration. The particular value of this number is not important, but it should be within ± 5%
of the corresponding value in the Quality Control Report. If so, you can be confident that all
subsystems of your analyzer are working properly.
Before proceeding, please make sure of the following:
• The reagent bottle is full and properly connected. Reagent bottle is the reagent used in the
phosphate analysis.
• The 10 ppm phosphate calibration standard (1 L bottle) is full with the standard and properly
connected.
• The drain and sample lines are connected. Verify the sample is flowing into the sample
chamber located at the bottom right side of the fluidics enclosure.
• The lines are primed and there are no trapped air bubbles in any of the lines.
To prime the lines:
MENU → SERVICES → PRIME FLUIDICS → AUTO PRIME ALL
Repeat auto prime as necessary to purge all the air from the lines. When done proceed to
calibrate:
MENU → MEASUREMENT → CALIBRATE → CALIBRATE STANDARD [ENTER]
NOTE
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.
The result of the calibration will be displayed as follows:
STANDARD : 10 ppm ***depends on the range selected
ABSORBANCE : 0.19
SLOPE : +055.00
INTERCEPT : -0.4
Refer to Theory of Measurement section for a detailed explanation about the slope and intercept.
The absorbance value found corresponds to the standard concentration used. If the calibration
absorbance value is within ± 5% of your system QC report, then the system is operating properly
and ready for running sample analysis. If the data is different, repeat the calibration cycle before
proceeding further.
3.1 Executing a Manual Calibration
If the result is outside the user specified tolerance (default 5%), the analyzer will warn the user to
avoid storing the wrong calibration data. The user may then ACCEPT or REJECT the calibration
result. Note user accepted manual calibration will become the REFERENCE calibration data.
The analyzer will use the REFERENCE calibration data when checking for the acceptable
tolerance limits in BOTH manual and auto cal cycles.