Teledyne 6712SR - Manual (Page 100)

6712SR Refrigerated Sampler
Section 5 Extended Programming
5-12
5.7 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.
5.8 Rinses and Retries
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
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.
5.9.1 Event Pacing To program the sampler for event pacing, select event paced.
Refer to Table 5-3 for 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
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 OF
___ ft
(min - max)
Screens for Line Rinses
and Sampling Retries
__RINSE CYCLES
(0-3)
RETRY UP TO __ TIMES
WHEN SAMPLING
(0-3)
Extended Pacing Screen
UNIFORM TIME PACE
FLOW PACED
EVENT PACED
NONUNIFORM TIME