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Chapter 2 Installation
INPUT / OUTPUT FUNCTIONS
The 1160, rear panel includes one set of eight I/O pins that can be used to monitor and
control the unit's operation. The pin- assignments for the connector are shown in Figure
2-2.
As indicated, pins 1 and 2 are used for a general service alarm, pins 3 and 4 are used by
the low-temperature alarm, and pins 5 and 6 are used by the low-pressure alarm. The
pressure alarm is triggered in the event of a pump failure and the temperature alarm is
triggered in the event of heater failure. In each case, an alarm condition is indicated by
continuity between the two pins. For example, if the heater circuit fails, it will create a
low-temperature condition and a relay will close connecting pin 3 to pin 4.
The service alarm on pins 1 and 2 is intended as reminder to change the adsorbent or
scrubber canisters on a routine basis. The alarm triggered on the basis total elapsed run-
time since last reset. As described in Chapter 3, the service alarm timing may be
adjusted, or the alarm can be turned off, by selecting a jumper on the display board
located on the inside surface of the front panel. The timer-reset button is also located on
the display board.
In addition to the alarm outputs, the rear panel connector also has one input and a ground.
By connecting pin 7 to instrument ground at pin 8, a data logger or other control device
can switch the 1160 to stand-by mode. In stand-by mode the internal pump is switched
off. Stand-by is used to reduce pump wear and prolong adsorbent media life by turning
the pump off when zero-air is not needed.
Figure 2-2. Pin Out of Rear Terminal Strip
2-3
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