Hach SIGMA 900, Руководство пользователя

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Section 5
Page 45
8837prg.fm
Storm Water Programming
• When sampling with multiple bottles, the sampler can be programmed to
collect one large “first flush” sample (or small multiple samples) at timed
interval(s). The number of bottles segregated for the first flush sample is
selectable. Concurrently, flow weighted samples are collected from the
beginning of the storm until all remaining bottle(s) are filled, or after a user
selected time has elapsed.
• Storm water samplers are equipped with a special prerinse that occurs
only with the first sample collection. This “one time only” rinse assures a
clean intake for installations that may remain dormant for extended
periods, and extends battery life by eliminating the prerinse for
subsequent samples.
5.12.1 Programming Instructions for Storm Water Sampling Routine
With the sampler in any of the three standby states (
READY TO START
,
PROGRAM HALTED
,
PROGRAM COMPLETE)
press and hold the
CLEAR ENTRY
key for several seconds. The display will read
LEVEL CONTROL?
. Press
NO
to disable the storm water program routine. Press
YES
to access the storm
water program.
The table below explains the storm water programming choices:
Item
Number
Message Description of Message
1 LEVEL CONTROL?
Press
YES
to access the storm water program. The display prompts the question in
item 2. Pressing
NO
disables the storm water program routine and also displays the
question
SPECIAL OUTPUT?
, which is explained in the following section titled “Special
Outputs”.
2 STORM MODE?
Press
YES
to proceed to the first storm water programming prompt. The message in
item 3 appears. Press
NO
to disable the storm water program routine and permit
programming the sampler for level control.
3
FIRST FLUSH
INTERVAL = _ _ MIN
Select the timed interval for which you want to collect samples during the early stage
(first flush) of the storm event. Typically, the first flush interval is 30 min.
If the sampler is programmed for single bottle (composite) sampling, no samples are
collected in the first flush interval. The assumption is made that if the sampler is
equipped with only one bottle, the first flush sample is collected manually. After the first
flush interval lapses, samples are collected in the manner programmed in the main
program as described in
section 5.5 .
4 # BOTTLES = _ _ Enter the number of bottles to be allocated for the first flush sample(s).
5
SET TIMED INTERVAL,
INTERVAL 01 = _ _ MIN
Set up to 24 different time intervals during the first flush interval. Press the
NO
key to
repeat the last entered time interval for subsequent samples. Enter the time interval for
collecting samples in the first flush period.
6
BOTTLES PER
SAMPLE? or SAMPLES
PER BOTTLE?
This message appears if the sampler is programmed for multiple bottle operation.
Select the desired multiplex mode—either bottles per sample or samples per bottle. 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.
7a BOTT/SAMP = _ Enter the number of bottles for each sample collected within the first flush interval.
7b SAMP/BOTT = _ _ Enter the total number of samples to be delivered to each bottle.
8
CHANGE FIRST FLUSH
VOLUME?
Enter the volume of the first flush/grab sample independent of the sample volume of
the flow weighted composite. Press the
NO
key to retain the volume previously entered.
Press the
YES
key to display the next prompt.
9a VOLUME = _ _ _ _ mL Enter the volume of the first flush sample(s).
9b CALIBRATE VOLUME? Item 9c will appear if you press the
YES
key. Item 9d will appear if you press the
NO
key.