Campbell Scientific CVS4200 / BVS4300 Stationary Samplers - Manual (Page 45)

CVS4200 / BVS4300 Stationary Samplers
DAILY CYCLE
Allows the sampler to deposit equal sample volumes into a predetermined
number of containers per programmed day. Each day may have any number of
samples taken, dependent on the SAMPLE INITIATION mode chosen.
Deposits are made to as many as 9 containers per day, to a cumulative total of
24 containers. (For example, choosing a 24 bottle format, the sampler may be
programmed to deposit to Three (3) bottles on any six days of the week,
together with up to Six (6) bottles on the seventh.) Timing is dependent on the
crystal-controlled Real Time Clock in the controller. The first program day
will be the current day the programming is done, unless the START DELAY
option is chosen to determine when sampling will begin.
TIMED STEP (Override)
This option will cause the sample distributor to step to a new container
regardless of the status of the SAMPLE INITIATION setting. For example,
the actual sampling may be under the control of a flowmeter and taking
samples based on the flow rate as determined by pulses or 4-20mA input to the
controller. When the user-programmed Timed interval has elapsed, the
controller will Step to a new container. The Timed Step can be set for any
interval up to 99 hours 59 minutes. Progress of the step timer can be viewed
by selecting View, Program Type and pressing ENTER twice. Thus you may
view the REMAINING TIME or the step timing.
7.6.4 Programming START DELAY
7.6.4.1 START DELAY Overview
START DELAY is the function which will delay the beginning of a sample
program until certain external conditions are met. Upon meeting those
conditions, the sampler will initiate a sample cycle and then operate based on
the SAMPLE INITIATION parameters. Under START DELAY, flashing
text prompts the user to scroll through available options by pressing arrow
keys. These options only require that the correct equipment is present to utilize
them. The last option selected in previous programming will be the first to
appear on the display.
The display showing Disabled will reflect
the fact that the function is not being used.
The basis for several timed functions is the
Real Time Operating System. Time (of) Day
will be a means of setting the timing period
for the START DELAY function. The
format is on a weekly basis, requiring hour,
minute, AM/PM and day inputs (HH:MM
AM SUN). This means the start of a sampler
program can be delayed up to seven days.
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