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Section II Operating Instructions Teledyne API T802 Paramagnetic O
2
Analyzer Operation Manual
46
RS-485 CONNECTION
As delivered from the factory, COM2 is configured for RS-232 communications.
This port can be reconfigured for operation as a non-isolated, half-duplex RS-485
port. Using COM2 for RS-485 communication will disable the USB port. To
reconfigure this port for RS-485 communication, please contact the factory.
3.3.2. PNEUMATIC CONNECTIONS
This section presents information about gases and pneumatic connections.
CAUTION
GENERAL SAFETY HAZARD
While O
2
is itself not toxic, the sample gas measured by, and in some cases the
calibration gases used with the T802 can contain other components that are
hazardous (e.g. NO, NO
2
, SO
2
, CO, etc).
Obtain a Material Safety Data Sheet (MSDS) for each such gas. Read and
rigorously follow the safety guidelines described there.
Do not vent sample gases containing hazardous components into enclosed areas.
3.3.2.1. CALIBRATION GASES
ZERO GAS
Zero gas is similar in chemical composition to the earth’s atmosphere but
scrubbed of all components that might affect the analyzers readings. Teledyne
API recommends using pure N
2
when calibrating the zero point of your O
2
sensor.
CAUTION
GENERAL SAFETY HAZARD
Rapid release of pure N
2
gas into an enclosed space can displace oxygen, and
therefore represents an asphyxiation hazard. This may happen with few
warning symptoms.
Do not vent calibration gases into enclosed areas.
3.3.2.2. SPAN GAS
Span gas is specifically mixed to match the chemical composition of the type of
gas being measured at near full scale of the desired measurement range. In this
case, O
2
measurements made with the T802 analyzer, Teledyne API recommends
using 21% O
2
in N
2
when calibrating the span point of your O
2
sensor.
Cylinders of calibrated O
2
gas traceable to NIST-Standard Reference Material
specifications (also referred to as SRMs or EPA protocol calibration gases) are
commercially available (see Table 3-8).
07275B DCN6418