Hach SIGMA 900, User Manual

Page: 40 / 94

Page 40
Explanations of Program Messages
8837prg.fm
Section 5
10c SAMPLE = _ _ _
Enter the number of samples to be collected. Because sample liquid is delivered to all
bottles with each initiation, the number of samples in this entry also equals the number
of distributor arm revolutions, after which the program terminates.
11
DISCRETE MODE,
SAMPLES/BOTTLE? or
BOTTLES/SAMPLE?
This message appears if more than one bottle is entered for the total number of bottles
in the parameter entry mode. It prompts the user to select the desired multiplex
mode—either samples per bottle or bottles per sample. If the desired mode appears,
press the
YES
key. If it does not appear, press the
NO
key. This will cause the desired
mode to appear.
11a SAMP/BOTTLE = _ _ _
Enter the total number of samples to be delivered to each sample bottle. If the display
reads
VALUE TOO HIGH
after the desired number has been entered, reduce the number
of samples per bottle. The maximum number of samples per bottle can be determined
by dividing 10 into the total bottle volume (in milliliters).
11b BOTTLE/SAMPLE = _ _
Enter the number of bottles desired for each sample. If you want to collect one sample
per bottle, the same result would be obtained if the sampler was programmed for one
bottle per sample. After the number of samples per bottle or bottles per sample is
entered, the display asks for the same sample volume.
11c TIMED BOTTLE?
This message appears only if the advanced program features are enabled and if the
NO
key is pressed in item 11a. For a complete description of the scenarios possible
with the timed bottle function, refer to section 5.14.4 on page 49 .
12 CHANGE VOLUME?
Press
NO
to retain the sample volume from the previous program (programming items
13, a–h are skipped), and the display will prompt the message in item 14.
13 SAMPLE VOL = _ _ _
Enter the desired sample volume (in mL) to be delivered to the sample container each
time a sample is initiated.
13a CALIBRATE VOL?
This message appears after you enter sample volume. If greater volume accuracy is
desired, press the
YES
key. A 'yes' response will cause either message 13b or 13c to
appear. Press
NO
to skip the calibration and go to the next step.
13b AUTO CALIBRATE?
This message appears if you press the
YES
key in item 13a and the auto calibrate
mode was selected in the previous sample program. Otherwise,
TIMED CALIBRATE?
will
appear.
There are two sample volume calibration methods:
AUTO CALIBRATE
and
TIMED
CALIBRATE
. The Auto Calibrate method uses the liquid sensor to determine sample
volume and can only be used if the sampler is located above the sample source. The
intake tubing must slope downward from the sampler to the source and should be free
of any loops. If you press the
YES
key, the message in item 13d will appear. If you press
the
NO
key, the message in item 13c will appear.
13c TIMED CALIBRATE?
Timed calibration of the sample volume is necessary when site conditions do not
permit the sampler to locate above the sample source, and for intake line lengths
greater than 99 feet. This calibrate mode disables the liquid sensor and intake fault.
13d READY TO PUMP?
If you press the
YES
key the sampler will pump to collect one sample. The pump will
first pre-purge the intake line, draw sample liquid, and then post-purge.
Before pressing the
YES
key, pull the pump tubing off of the fitting where it enters the
sampler housing and place a graduated cylinder at the sample discharge point.
13e
ENTER ACTUAL
VOLUME PUMPED,
VOL PUMPED = _ _ _ _
Enter the volume of sample (in mL) delivered to the graduated cylinder.
To confirm that the sampler will pump the desired volume, with all programming steps
completed, press the
TAKE SAMPLE
key to collect a sample.
13f
TIMED CALIBRATE -
READY TO PUMP?
This message appears with a 'yes' response to item 13c.
Before pressing the
YES
key, pull the pump tubing off of the fitting where it enters the
sampler housing and place a graduated cylinder at the sample discharge point.
13g STOP AT MARK
After pressing the
YES
key in response to item 13f, the pump will pre-purge the intake
line and begin pumping liquid into the graduated container. When the desired volume
has been delivered, press the
STOP PUMP
key. The pump will then purge the intake
tubing. The sampler will hold the time to deliver the desired sample volume in memory.
This timed volume is repeated for subsequent samples.
Item
Number
Message Description of Message