6700SR Refrigerated Sampler
92
Display Backlighting
The display has a backlight that is adjustable so that the backlight
is always off, timed or always on.
In the timed backlight mode the sampler turns the backlight off af-
ter detecting no key strokes within 60 seconds. Any keystroke (ex-
cept ON-OFF) turns the backlighting on again. In this mode the
backlight must be on before the sampler accepts a menu choice or
number entry. If you press a key and a screen does not respond, it
is because the keystroke turned the backlight on.
Isco recommends you use either the setting, BACKLIGHT AL-
WAYS OFF or TIMED BACKLIGHT when using a battery.
Event Marks
The sampler generates an event mark at each sample event, send-
ing it through the flow meter connector to a connected instrument:
a 3200 Series Flow Meter, 4200 Series Flow Meter, or 4100 Series
Flow Logger.
The event mark may also control an external device; a connected
solenoid relay, for example. When using the event mark for a data
logger or to control external devices, you may need to adjust the
mark by changing the factory settings.
The event mark is adjustable through the hardware setup screens.
You can set up the sampler to generate an event mark for every EV-
ERY SAMPLE or for COMPLETE SAMPLES. If you select COM-
PLETE SAMPLES, the sampler sends a three-second pulse only
after it successfully collects a sample. The sampler will not send an
event mark if an error occurs, such as “No Liquid Detected.”
If you select EVERY SAMPLE, the sampler will send an event
mark every time a sample is initiated. The event mark signal can
be a:
• 3-second pulse at the beginning of the presample purge.
• 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 presample purge to the end of the postsam-
ple purge.
• Variable duration pulse generated only during forward pumping.
Figure
20
shows 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
20
).
Adjusting the Display
Backlighting
• Enter the Hardware setup.
Step through the screens until
you see:
49
BACKLIGHT ALWAYS OFF
TIMED BACKLIGHT
CONTINUOUS BACKLIGHT
• Press STOP twice to return to
the main menu.
Event Mark Screens
Charts for event marks screens ap-
pear in:
Figure 40
,
Extended
Programming: Hardware
Screens
on page 124.
Figure 41
,
Extended
Programming: Hardware Quick
View Screens
on page 125.
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