Teledyne 3220 - Multi-channel oxygen monitor system - Manual (Page 51)

Oxygen Monitor System 5 Failure and Error Codes
Teledyne Analytical Instruments 37
cleared. In this case, only the specific alarm channel will be affected. In the
occurrence of an additional alarm in the same channel, or any alarm in any other
channel, the AUDIBLE ALARM will again activate.
In either case, once the audible alarm has been silenced the oxygen gas level may be
determined by viewing the LCD display reading on the channel module. When the level has
diminished to less than the alarm level, the system may be reset by depressing the RESET
button.
4.11 FAIL Alarm Conditions
The possible FAIL Alarm Conditions are:
- A cell failure (once the output falls below the programmed trigger point.
- Power supply failure.
- 0-10V Output fails (during start up diagnostic only).
- The ADC times out without a proper end-of-conversion (EOC).
Whenever a failure is detected, the FAIL alarm is activated: the blue LED turns on, the
alarm relay is de-energized (the FAIL relay is FAIL-SAFE, and the audible alarm is
activated. The power supplies to both sensors are disabled.
Failure alarms are accompanied with a FAIL code number. The display alternates
between “FAIL” and the code number.
The failure alarm may be bypassed (by pressing the Bypass Button), in which case, the
blue LED flashes, and the audible alarm is deactivated.
To acknowledge a failure condition, press RESET. This restarts the instrument (as if
the STNDBY button has been pressed twice). Alternatively, you may turn the unit OFF
using the STNDBY button.
NOTE: The reason the failure modes require restarting the instrument is that once a failure
has been detected, the unit should not be used until the error is fixed.
When a failure alarm is detected, the other two alarms (Alarm 1 and Alarm 2) are
disabled.