Thermo Scientific FTIR, Руководство пользователя

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A
Temperature
controllers The FTIR Heated Valve Drawer features a temperature controller for
each heater. The temperature controller can be used to set the target
temperature and ramp rate, monitor current temperature, set an alarm
for overheating, and more.
B
Flowmeters The system features two flowmeters to monitor and control the flow of
gas in the system. See the Appendix for the plumbing diagram for
your system to see exactly how to use the flowmeters.
l
Use the Calibration Flow flowmeter (left) to measure the flow of
Span 1, Span 2, or Nitrogen gas inlets to the gas cell. When the
calibration gas selection valve is closed, this meter will display
zero. This flowmeter should display zero when the sample control
valve is open and you are sampling from the Heated Sample Line.
l
Use the FTIR Flow To Vent flowmeter (right) to monitor the total
gas flow through the cell. The two flowmeter readings may not be
exactly equal due to differences in pressures seen during
sampling.
C
Sample control
valve The sample control valve controls the flow of gas from the Heated
Sample Line inlet. Close this valve when you are running gasses from
the Span 1, Span 2, or Nitrogen inlets.
D
FTIR outlet
control valve Use the FTIR Outlet Control valve to control the flow of gas exiting the
gas cell to the vacuum pump. This valve should be left in the OPEN
FTIR OUTLET position for all normal operation. Close the valve for
storage and shipment.
Typically, you should flow clean, dry Nitrogen through the system
before closing the valve for safe storage.
E Needle valves The FTIR INLET RESTRICT and FTIR OUTLET RESTRICT needle
valves are used for precise control of the flow of gas into and out of
the gas cell.
Use these needle valves to adjust the balance between input and
output gases to maintain the sample pressure and flow in the gas cell
at a constant rate.
Thermo Scientific Modular Gas System User Guide 37
Operation