Teledyne 3350 - Microprocessor based control room monitor for personnel safety - Manual (Page 30)

4 Operation Model 3350
4-2 Teledyne Analytical Instruments
4.2 Alarm Conditions
The alarm setpoints are preset at the factory and can not be changed by
the user.
Alarm 1 (CAUTION)
Factory preset at 20% Oxygen. Contact factory for custom Alarm
Setpoints.
When CAUTION Alarm (Alarm 1) is activated, the LED on the
front panel will begin to blink. In addition, the digital readout will
flash alternately with the oxygen reading and the letters “CAUt”
for CAUTION.
Alarm 2 (DANGER)
Factory preset at 19.5% Oxygen per OSHA Specification. Contact
factory for custom Alarm Setpoints.
When DANGER Alarm (Alarm 2) is activated, the LED on the front
panel stay on continuously. In addition, the digital readout will flash alter-
nately with the oxygen reading and the letters “dAng” for DANGER.
Sensor Fail Alarm
The SENSOR FAIL alarm is factory set to a reading less than 0.05%
O
2
. Should this alarm trigger the ALARM Indicator below the SET Func-
tion buttons will blink, and the alarm relay contact dedicated to this function
will change state.
4.3 Calibration
Prior to operating this instrument for the first time, the Oxygen Monitor
must be calibrated. If this instrument is to be used as a safety monitor,
routine calibration should be carried out on a weekly basis.
If it is not feasible to use ordinary air as the calibration gas, then clean,
compressed instrument air can be used. It will probably be necessary to seal
the sensor in the piped-in calibration gas to isolate it from the surrounding
atmosphere. A flow-through adaptor can be purchased from TAI as an
accessory for those applications. Although a special calibration gas can be
used, the calibration results will be meaningless unless the oxygen concentra-
tion of the calibration gas is known, and the analyzer is adjusted to indicate