Teledyne 3300TA - Low cost trace oxygen analyzer - Manual (Page 21)

3-5
Trace Oxygen Analyzer Installation 3
Teledyne Analytical Instruments
Alarm #1 Programmable as high or low alarm (actuates when
concentration is above threshold). Can be set anywhere
between 0 and 9999ppm, but must be set ABOVE the
threshold set for the LO Alarm.
Alarm #2 Programmable as high or low alarm (actuates when
concentration is below threshold). Can be set anywhere
from 0 to 9999ppm.
CAUTION: There could be hazardous voltage at the alarms termi-
nals, even when power is removed from the instrument.
3.4 Gas Connections
The standard Model 3300TA has two inlets and one outlet fixture only.
Calibration gasses can be connected into the "Span" inlet. All of the gas
connections are 1/4 inch brass fittings.
A switching valve is provided to feed the analysis unit with either
sample or gas.
A flowmwter and flow controller valve are part of the system and will
assist in setting the flow of the gas.
Sample flow should be adjusted to 2 SCFH. The sample vent connec-
tion should not restrict the sample flow. The sensor is designed to operate at
atmospheric pressure. Restricting the sample vent line will result in pressur-
izing the sensor and altering the O
2
reading.
The pressure required will depend on the sampling system. When
venting into a constant pressure, such as the atmosphere, controlling input
pressure is simple. If you are venting into a system of varying pressure, then
some form of pressure regulation is required to maintain a constant pressure
across the sensor.
Sample and Span pressure is not to exceed 50 psig (345 kpa)