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3 Installation
The alarm relay circuits are designed for failsafe operation, meaning the
relays are energized during normal operation. If power fails the relays de-
energize (alarms activated).
The contact connections are indicated diagrammatically on the rear
panel as Normally Closed, Common, and Normally Open. Figure 3-2
explains how these act in failsafe operation.
Alarm ! and Alarm 2 can both be configured as either HI or LO. A
HI alarm will activate when concentration is above treshold, while a LO
alarm will activate concentration is below treshhold.
Figure 3-2: Contact ID for FAILSAFE Relay Operation
The specific descriptions for each type of alarm are as follows:
Alarm #1
Alarm #2
Sensor Fail
CAUTION:
Internal Sensor Wiring: The receptacle for the analysis unit cable is
located in the lower left-hand corner of the rear panel. The 6-pin polarized
connector is keyed to fit only one way into the receptacle. Do not force it in.
The other end of the cable has two terminal connectors. This should be
connected to the header on the top of the sensor.
3-4
Programmable as high or low alarm (actuates when
concentration is above threshold). Can be set anywhere
between 0 and 25 %, but must be set ABOVE the thresh-
old set for the LO Alarm.
Programmable as high or low alarm (actuates when
concentration is below threshold). Can be set anywhere
from 0 to 25 %.
Actuates when the output of the Micro-Fuel Cell sensor
falls below the acceptable level (0.05% O
There could be hazardous voltage at the alarms termi-
nals, even when power is removed from the instrument.
Teledyne Analytical Instruments
Model 3300
).
2
PB
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