6
The alarms function as follows:
1. Sample Cycle. This set of relay contacts close during the sample cycle, indicating that a
sample is in progress.
2. Missed Sample. This set of relay contacts close when the sampler has not successfully taken
a sample. The sampler attempts to draw the sample twice. The contacts close at the end of
the sample cycle and will remain closed until the sampler is reset, or another sample cycle is
started.
3. Bottle Full/End of Sequence. This set of relay contacts close when a bottle full condition is
detected on single-bottle (composite) samplers, or when the sampler has completed a
sampling sequence (deposited the last sample in the last bottle) on multi-bottle (discrete)
samplers.
Stationary Sampler Battery Backup Option.
The battery backup option for stationary samplers allows the sampler to continue to operate
when normal AC power is lost for short periods of time. Backup power is only supplied to the sampler,
not the refrigerator.
The battery backup consists of a 12VDC 8Ahr battery and a dual-stage charger that are mounted
outside of the sampler. Inside of the sampler, a relay is used to switch between the battery backup and
normal power. A wiring harness connects the battery to the sampler with a two-pin connector.
With AC power present, the charger maintains a charge on the battery, and the sampler’s internal
+12VDC power supply powers the sampler through the normally open contacts of the relay (the relay is
powered by the sampler’s power supply). When AC power is lost the relay is de-energized and switches
power to the backup battery. See Figure 5.
POWER SUPPLY
GROUND
+12VDC
SAMPLER
POWER
-
+
AC POWER
CHARGER
BATTERY
AC POWER
SAMPLER
RELAY SHOWN
DEENERGIZED
Figure 5.
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