Percent Oxygen Analyzer | Installation | |
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The alarm relay circuits are designed for failsafe operation, meaning the relays are energized during normal operation. If power fails the relays
The contact connections are indicated diagrammatically on the rear panel as Normally Closed, Common, and Normally Open. Figure
Alarm 1 and Alarm 2 are configured as HI and LO respectively. A HI alarm will activate when concentration is above threshold, while a LO alarm will activate when concentration is below threshold.
Figure 3-3: Contact ID for FAILSAFE Relay Operation
The specific descriptions for each type of alarm are as follows:
Alarm #1 | Programmable as high alarm. Can be set anywhere |
| between 0 and 100 % but no lower than Alarm #2. |
Alarm #2 | Programmable as low alarm. Can be set anywhere |
| from 0 to 100 % but no higher than Alarm #1. |
Sensor Fail | Actuates when the output of the sensor falls below a |
| factory programmed acceptable level or the |
| thermocouple is open. |
CAUTION: | THERE COULD BE HAZARDOUS VOLTAGE AT THE |
| ALARMS TERMINALS, EVEN WHEN POWER IS |
| REMOVED FROM THE INSTRUMENT. |
Teledyne Analytical Instruments | 27 |