6712FR Refrigerated Sampler Section 5 Extended Programming

5.7 Suction Head

Extended Screen for Suction Head Settings

AUTO SUCTION HEAD

ENTER HEAD

If you choose AUTO SUCTION HEAD, the head will be determined for you. If you select ENTER HEAD, the screen below will be displayed so you can enter the suction head.

Suction head is the vertical distance between the surface of the liquid source and the sampler’s pump. At each sample event, the sampler determines the suction head automatically.

In extended programming, you can manually enter the suction head if you want. Select ENTER HEAD only when the head remains stable and you can measure it accurately.

SUCTION HEAD OF

___ ft

(min - max)

5.8 Rinses and Retries

Screens for Line Rinses and Sampling Retries

__RINSE CYCLES

(0-3)

RETRY UP TO __ TIMES

WHEN SAMPLING

(0-3)

Rinses and retries are extended programming features. You can program the sampler to rinse the suction line automatically. During a line rinse cycle, the sampler draws liquid through the line to the liquid detector. As soon as it detects liquid, the sampler reverses the pump to purge the line.

The sampling retries feature lets you set the number of times, from 0 to 3, that the sampler tries to detect liquid in the line before skipping the sample.

5.9 Pacing

Extended Pacing Screen

UNIFORM TIME PACE

FLOW PACED

EVENT PACED

NONUNIFORM TIME

5.9.1 Event Pacing

Sample pacing is the rate at which the sampler takes samples. Depending on the type of pacing you select, the rate is controlled by the sampler’s internal clock or by inputs received from con- nected instruments.

Standard programming provides time pacing and flow pacing, which are described in Section 4. Extended programming pro- vides additional pacing types, so its pacing screen (see example in margin) has four items listed instead of two.

“Uniform time” pacing is identical to “time” pacing in standard programming. “Flow paced” is the same for both types of pro- gramming. Event paced and nonuniform time pacing are described below.

To program the sampler for event pacing, select event paced. Refer to Table 5-3for an example of event paced sampling that uses three event conditions.

Up to fourteen event conditions can be defined (for two-part pro- grams, up to fourteen event conditions can be defined for each part). An event will occur when any of the programmed event

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Teledyne 6712FR manual Suction Head, Rinses and Retries