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Installation
0–10 V Range ID:
4–20 mA % Range:
Alarm Relays: The three alarm-circuit connectors are screw
terminals for making connections to internal alarm relay contacts. There
is one set of contacts for each type of alarm. Contacts are Form C, with
normally open and normally closed contact connections capable of
switching up to 0.5 ampere at 125 VAC into a resistive load.
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 3-3
explains how these act in failsafe operation.
The specific descriptions for each type of alarm are as follows:
Configured as high alarm (actuates when
HI Alarm
concentration is above threshold). Can be set
anywhere within the full range of the analyzer (0-
9,999 ppm), but must be set ABOVE the threshold set
for the LO Alarm.
Configured as low alarm (actuates when
LO Alarm
concentration is below threshold) within the full
range of the analyzer (0-9,999 ppm), but must be set
BELOW the threshold set for the HI Alarm.
Actuates when the output of the micro-fuel cell sensor
Sensor Fail
falls below the acceptable level.
Teledyne Analytical Instruments
03.33 V = Low Range, 06.66 V = High Range,
10 V = Air Cal Range.
Current increases with increasing oxygen
concentration, from 4 mA at 0 percent oxygen to
20 mA at full scale percent oxygen. (Full scale =
100% of programmed range.)
Model 3190
20
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