Teledyne GFC7000E Microscope & Magnifier User Manual


 
Model GFC7000E Instruction Manual Getting Started
04584 Rev A1 18
2. Attach sources of zero air and span gas (see Figures 3-3 through 3-8 inclusive).
Span Gas is a gas specifically mixed to match the chemical composition of the type of gas
being measured at near full scale of the desired measurement range.
In the case of CO
2
measurements made with the Teledyne Analytical Instruments Model
GFC7000E Analyzer it is recommended that you use a gas calibrated to have a CO
2
content
equaling 80% of the range of compositions being measured.
EXAMPLE: If the application is to measure between 0 ppm and 500 ppm, an appropriate
Span Gas would be 400 ppm. If the application is to measure between 0 ppm and 100
ppm, an appropriate Span Gas would be 80 ppm.
Span Gas can be purchased in pressurized canisters or created using Dynamic Dilution
Calibrator such as the Teledyne Analytical Instruments Model 700 and a source of dried
air scrubbed of CO
2
such as a Teledyne Analytical Instruments Model 701 Zero Air
Generator in combination with a canister of indicating soda-lime.
Zero Air
is similar in chemical composition to the earths atmosphere but scrubbed of all
components that might affect the analyzer’s readings.
In the case of CO
2
measurements this means CO
2
less than 0.1 ppm of CO
2
and Water
Vapor. Zero Air can be purchased in pressurized canisters or created using a Teledyne
Instruments Model 701 Zero Air Generator in combination with a canister of indicating
soda-lime.
3. Attach an exhaust line to the exhaust outlet port.
The exhaust from the pump and vent lines should be vented to atmospheric pressure using
maximum of 10 meters of ¼” PTEF tubing.
CAUTION
Venting should be outside the shelter or immediate area surrounding the
instrument.
4. Attach a source of dried air scrubbed of CO
2
to the purge inlet port
NOTE
The source of purge air should be at 20-25 psig and capable of maintaining a flow of at
least 0.5 liters/min.
Purge source air pressure should not exceed 35 pisg
5. Once the appropriate pneumatic connections have been made, check all pneumatic fittings for
leaks using a procedure similar to that defined in Section 9.3.3.