Hach SIGMA 900, Руководство пользователя

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Section 5
Page 49
8837prg.fm
Advanced Program Features
5.14.1 Program Start/Stop
The sampler can be programmed for up to 12 start/stop intervals. You can
directly enter the time and date of each start and stop period by using the
sampler keypad. This feature is useful for collecting samples on or around
work shifts or other irregular schedules.
5.14.2 Variable Interval
The sampler may be programmed for up to 99 different time or flow pulse
intervals between samples. Each interval can range from 1 to 9,999 minutes
or pulses.
The Variable Interval feature is useful in combined sewer overflow and storm
water run-off studies. It allows frequent sample collection at the beginning of
the storm event, when pollutant loading is greatest, with increasingly longer
intervals as the storm event matures. With the optional Liquid Level Actuator
(Cat. No. 943), the sampler may be programmed to remain dormant until
liquid in the stream or conduit reaches a predetermined level.
5.14.3 Two-, Four-, and Eight-Bottle Sampling
In addition to single and 24-bottle operation, the advanced program permits
use of two 1-gallon polyethylene containers, four 1-gallon polyethylene
containers, or four 2.5-gallon glass containers, and eight 2.3-liter polyethylene
containers or eight 1.9-liter glass bottles.
Multiple bottle sequential and multiple bottle composite sampling is possible
with all bottle configurations. Multiple bottle sequential sampling consists of
depositing sample liquid in one bottle, with each sample initiation. If desired,
multiple samples may be collected in one bottle (the number of samples per
bottle is user selectable), before the distributor arm advances to the next
bottle. Multiple bottle composite sampling consists of depositing sample liquid
in more than one bottle with each sample initiation (the number of bottles per
sample is also user selectable).
5.14.4 Timed Bottle
When sampling with multiple bottles, samples are collected on a time or flow
proportional basis, while the rotating distributor arm advances to the next
bottle on a user selectable time interval (choice of real time, i.e. 12:00 AM or
1 to 9,999 minutes in one-minute increments).
When sampling with two bottles, the sampler may be programmed on a time
or flow basis to deposit liquid in the first bottle on Day 1, and the other bottle
on Day 2. In this manner, the distributor arm alternates between bottles on a
daily basis to assure a continuous sampling program.
Two-bottle sampling is also useful when it is necessary to split samples for
independent analysis. Program the sampler to deliver sample to both
containers each time a sample cycle begins.
When sampling with four, eight, or 24 bottles, the sampler may be
programmed to deliver sample in multiple (two, three, four, etc.) bottles each
time a sample cycle begins, after which the distributor arm returns to the first
bottle in the group. The same bottles are filled again when the next sample
cycle begins. After a programmable interval (either in real time or 1 to 9,999
minutes has lapsed), the distributor arm will advance to the first bottle in the
next group, and so forth until sampling is completed in all bottle groups.