YSI 2900 series, Operation And Maintenance Manual

Page: 51 / 166

50
6.5.2 Flow Rate and Purge Time
The flow rate and purge time settings must be such that a sufficient volume of sample is pumped during each cycle to
completely purge the Monitor sample cup and system tubing. This is especially important when an antiseptic is used since
the antiseptic may damage the enzyme membrane if aspirated by the sipper.
The table below shows the flow rates and minimum time needed to purge the tubing lines from the solenoid valve to the
Monitor sample cup. These values are based upon a 6-fold volume turnover. Additional time may be necessary to purge
the line from the sample source to the solenoid valve. The volume of the supplied sample tubing is 5.1uL per inch.
Flow Rate
uL/min
Purge Time
Seconds
Flow Rate
uL/min
Purge Time
Seconds
100 900 1400 65
200 450 1500 60
300 300 1600 57
400 225 1700 53
500 180 1800 50
600 150 1900 48
700 129 2000 45
800 113 2100 43
900 101 2200 41
1000 90 2300 39
1100 82 2400 38
1200 75 2500 36
1300 69
Table 7-1
5. Touch the [Purge Time] button and enter the required purge time.
If you are using a filter on your sample line, make sure your Flow Rate does not exceed the maximum rated flow rate of
your filter. If necessary, touch the [Flow Rate] button and enter the correct flow rate.
6.5.3 Antiseptic
If you are not using an antiseptic solution:
6. Touch the [Antiseptic Cycle] button.