<4. Calibration>
4-7
IM 12Y18A03-01EN
1st Edition : Oct. 04, 2019-00
4.7
Dynamic Calibrator Check
1. The normal flow rate from the 20 cc syringe when the dynamic calibrator percent flow dial
is set to 500 (equals 50% flow) and when the range switch is set at x/1 is 20 mL/minute.
Therefore, the flow rate at x/10 is 2 mL/minute and at x/100 is 0.2 mL/minute.
2. Place a 10 mL graduated cylinder so that the calibration tubing will reach the top of the
cylinder.
3. Turn the pump range switch to x/100 and allow the flow to begin and to fill the tubing
completely, purging all air bubbles.
4. Simultaneously, insert the calibration tubing into the mouth of the graduated cylinder and
start a stopwatch.
5. Allow the flow to continue into cylinder for exactly ten minutes. Remove the tubing from the
cylinder and the pump off.
The total volume of the graduated cylinder should be 2.0 ± 0.1 mL.
If the total volume is not 2.0 ± 0.1 mL, the flow rate dial may be adjusted using the following
formula:
adjusted flow rate setting = present setting •
expected total volume
actual total value
For example, if the actual total flow was 1.8 mL, the new flow rate
setting will equal = (500) • (2.0/1.8) = 555
6. Perform the same flow rate check with the range switch on x/10 using a 50 mL graduated
cylinder. Set the percent flow dial to read 500 (50.0%).
7. Allow the flow to continue into cylinder for exactly five minutes. Remove the tubing from the
cylinder and turn the pump off.
The total volume of the graduated cylinder should be 10.0 ± 1.0 mL.
Fine adjustment of the flow rate dial may be made if the total flow is different from the
specified amount.
For example, if the actual total volume was 11.0 mL, the new flow rate
setting will equal = (500) (10.0/11.0) = 455
NOTE
For the best possible accuracy for the dynamic calibrator check, weigh volumes delivered for use
in calculations.
4.8
Offline Calibration Procedure
The offline calibration feature is simply a one point calibration without slope change. The term
“offline calibration” refers only to the fact that a sample from WE430 bypass is taken “offline”
for laboratory analysis; in fact, no downtime is experienced and the analyzer remains online
throughout the procedure.
Step
Operator Action
Scrolling Marquee
Main Display
Notes
1
Open the bypass/needle valve to
redirect the sample flow.
Actual temperature
reading
Actual concentration
reading
2
Press
to initiate the calibration.
HOLD and CAL
appear as mode.
3
If the calibration password is active,
enter the calibration password by
pressing
/
to set the first
digit,
to move to the next digit,
/
to set the values of the
remaining digits
and to move
through the remaining digits.
Press
to accept the password.
ENTER PASSWORD PASS
# # # #
4
CH1 or CH2
(flashing)
CAL CHnL
Displayed for two
channel analyzer