YOKOGAWA TB820D, User Manual, Page: 80 / 87

<APPENDIX>
App.-1
IM 12E01B30-02EN 2nd Edition : June 09 , 2021-00
Appendix Automatic wash/Automatic
calibration Sequence
The next diagrams show how the solenoid valve works during TB820D Automatic wash /
Automatic calibration.
n
During Automatic wash
The parameters on Valve working during Automatic wash are as follows.
● Drainage time
● Washing time
● Repeat count of wash
● Recovery time
◆ Automatic wash
Status
SV1(Sample)
SV2(Wash. water)
SV4(Drain)
OPEN
CLOSE
OPEN
CLOSE
OPEN
CLOSE
Drainage time
Drainage time
Washing
Recovery time
Meas. Recovery Meas.
Washing
1: When Automatic wash starts, SV1 (valve for sample) closes and shut the sample feeding.
At the same time, SV4 (valve for drain) opens and starts draining the sample out of the
flow cell.
2: After the “drainage time” elapses, SV4 closes and SV2 (valve for washing water) opens
and TB820D starts feeding washing water.
3: During the “washing time”, SV2 stays open, SV4 stays closed.
4: After the washing time elapses, SV4 opens and TB820D starts draining the washing
water out of the flow cell.
5: If “Repeat count of wash” is set to over 1, valve working1 to 4 is repeated.
6: Once the draining for washing completes, SV4 closes, SV1 opens, and TB820D starts
feeding a sample and go to “Recovery time”.
7: After the sample feeding starts when the Recovery time elapses, the automatic wash
sequence ends and a measurement starts.