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Thermo Fisher Scientific
FLOW
CONTROLLER
ZERO AIR
PRESSURE
REGULATOR
FLOW
CONTROLLER
CO
STD
SPAN-IN and SPAN-RETURN
BULKHEADS CAPPED
48i-TLE
Figure 4–3. Plumbing Configuration for Mulit-Point External Calibration
If a gas titration system will be used to deliver the calibration gases, the
span control valve located inside the 48i Trace Level-Enhanced cannot be
used to control the gas flows. In this arrangement, delivery of span gas will
be controlled by an external system. The internal CO scrubber will still be
active, so automatic zero adjustments, which are discussed later in this
chapter will still be possible.
Whatever configuration is selected, the operator must ensure that the
calibration gases will be supplied at a flow rate that slightly exceeds the total
flow required by the analyzer and any other flow demand connected to the
delivery system. The design must also ensure that the calibration gases are
supplied at atmospheric pressure. If the calibration gases are being supplied
to an inlet manifold at elevated pressure, an atmospheric dump, or by-pass,
must be provided. In addition, if an optional sample line filter is being
used, the calibration should be performed through this filter to compensate
for any leaks that the filter introduces.
MIXING
CHAMBER
FLOWMETER
FLOWMETER
SAMPLING MANIFOLD
VENT
SAMPLE BULKHEAD
TO SAMPLING MANIFOD
Model 48i Trace Level-Enhanced Instruction Manual
Calibration
Calibration Procedures
PORTS FOR
ADDITIONAL
ANALYXERS. (CAPPED
IF NOT IN USE)
4-7
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