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3700 Portable Samplers
Section 3 Programming Guidelines
3.9.15 Event Mark
3-50
If the bottle sets were switched every two hours and the sampler
has been inhibited for six hours, the restarted routine will begin
with the next bottle set. The routine may not continue with the
bottle set that would have been used had the sampler not been
inhibited.
The Event Mark option configures the sampler to send an event
mark to an interfaced flow meter or other equipment. The
sampler will supply a variable duration pulse of up to 700 mA at
12 V on pin E of the flow meter connector. Four types of signals
can be sent:
• a pulse at the beginning of the pre-sample purge
• a pulse at the beginning of forward pumping only
• a continuous signal during the entire pump cycle
• a continuous signal during forward pumping only
The event mark includes a signal sent on pin D which is inter-
preted and recorded by an Isco flow meter as the bottle
number(s) for the sample event.
The bottle number signal consists of a number of 100 millisecond,
12-volt pulses that equal the bottle number; i.e., four pulses rep-
resent bottle #4, 20 pulses represent bottle #20.
The type of signal selected from the Event Mark configure option
affects the event mark signal on pin E. In Figure 3-9A, a pulse
signal is sent at the beginning of the pre-sample purge. In Figure
3-9B, a pulse signal is sent during the sample volume delivery
portion of the sample event. In Figure 3-9C, a continuous signal
is sent during the entire pump cycle. In Figure 3-9D, a con-
tinuous pulse is sent for the duration of the sample-volume
delivery.
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