Teledyne 6712FR manual Event Mark Timing Diagram, Pre-sample and Post-sample Purge Counts

6712FR Refrigerated Sampler

Section 5 Extended Programming

•3-second pulse at the beginning of forward pumping only, marking the time the sampler deposited the sample.

•Variable duration pulse generated during the pump cycle, from the beginning of the pre-sample purge to the end of the postsample purge.

•Variable duration pulse generated only during forward pumping.

Figure 5-5shows event mark timing diagrams.

Bottle Number – Concurrent with the event mark, the sampler also sends a bottle number signal. The bottle number signal is a series of pulses. The number of pulses sent represents the bottle currently accepting a sample (see Figure 5-5).

Presample Purge Rinse Cycle Pump Volume 1 Pump Volume 2 Pump Volume 3 Postsample Purge

Pulse at Beginning of Presample Purge

Pulse at Beginning of Forward Pumping

Variable Duration Pulse During Entire Pump

Variable Duration Pulse During Forward

Event Mark Bottle Number

Event Mark Bottle Number

Event Mark

Bottle Number

PumpingEvent Mark Bottle Number

This diagram shows the pulses sent for a bottles-per-sample distribution scheme

Figure 5-5 Event Mark Timing Diagram

5.18.5Pre-sample and Post-sample Purge Counts

PRE-SAMPLE PURGE:

____COUNTS

(10-9999)

POST-SAMPLE PURGE:

DEPENDENT ON HEAD

FIXED COUNT

POST-SAMPLE PURGE:

____COUNTS

(10-9999)

The pre-sample purge is when the pump runs in reverse clearing the strainer of any debris before taking a sample. The pre-sample purge is set at 200 pump counts. After the sample is taken a post-sample purge occurs to clear the liquid from the suction line. The duration of the post-sample purge is determined by the length of the suction line to maximize the battery life. The pre- and post-sample purge can also be manually set.

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