46 Getting Started 083730300A DCN8101
CALIBRATION GAS SOURCES
SPAN GAS:
• Attach a gas line from the pressurized source of calibration gas (e.g. a bottle of NIST-SRM
gas) to the span inlet.
• Span gas can by generated by a T700 Dynamic Dilution Calibrator.
ZERO AIR:
• Zero air is supplied internally via a zero air scrubber that draws ambient air through the
ZERO AIR inlet.
INPUT GAS VENTING
The zero air supply and sample gas line MUST be vented in order to ensure that the gases
input do not exceed the maximum inlet pressure of the analyzer as well as to prevent back
diffusion and pressure effects. These vents should be:
• At least 0.2m long;
• No more than 2m long and;
• Vented outside the shelter or immediate area surrounding the instrument.
A similar vent line should be connected to the VENT SPAN outlet on the back of the
analyzer.
EXHAUST OUTLET
Attach an exhaust line to the analyzer’s EXHAUST outlet fitting. The exhaust line
should be:
• PTFE tubing; minimum O.D ¼”;
• A maximum of 10 meters long;
• Vented outside the analyzer’s enclosure.
2.3.2.6 PNEUMATIC CONNECTIONS: ZERO SCRUBBER/AMBIENT SPAN OPTION
Not available in the T300M, Option 50H is operationally and pneumatically similar to
Option 50A described earlier, except that the zero air is generated by an internal zero air
scrubber. This means that the IZS inlet can simply be left open to ambient air.
Internal zero/span and sample/cal valves control the flow of gas through the instrument,
but because the generator and calibrator limit the flow of zero air and span gas no shutoff
valves are required.
See Figure 2-2 for the location of gas inlets and outlets and span gas no shutoff valves are
required.
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