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Figure 3-13 Simplified Start Time Diagram
START
SAMPLING
Delay to
Start Time
Determined
by start time
entry or,start
time delay
The start time for a routine is either the programmed start time
or the time at which the delay-to-start time expires. The pro-
grammed start time is determined by entries made in Displays
#90, #91, #92, and #93. The delay-to-start time is determined by
the entry in Display #310 of the Start Time Delay configure
option. These input displays are shown in Table 3-6 and in the
charts in Figures 3-8, 3-10, 3-11, and 3-12.
NOTE: Unless the sampling routine contains a programmed
start time (Displays #91, #92, or #93), the sampler will delay the
start time according to the amount of time specified in the Start
Time Delay configure option. A programmed start time entry
always overrides any settings made in the Start Time Delay con-
figure option.
Teledyne Isco 4200 Series Flow Meters and 4100 Series Flow
Loggers provide two essential functions for certain sampling
applications. They send flow-pacing signals — flow pulses — to
the sampler for flow-paced sampling. The second function pro-
vides disable (inhibit) or enable signals to the sampler. A sampler
receiving a disable signal will suspend the sampling routine until
it receives an enable signal.
The sampler will disregard a disable signal it receives from a
flow meter during the delay-to-start time. If the sampler is dis-
abled when the start time occurs, it will suspend the routine
until it is enabled. Once enabled, the sampler will begin the time
or flow intervals. The sampler will initiate a sample event when
enabled for all time-paced routines. For flow-paced routines, it
will initiate a sample event when the sampler is configured to
take a sample-upon-enable in the Enable Pin configure option.
If the sampler is enabled when the start time occurs, it will begin
the routine. The sampler will initiate a sample event at the start
time for all time-paced routines. It will initiate a sample event at
3700 Portable Samplers
Section 3 Programming Guidelines
START
TIME
Sampling
Routine
3-63
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