Rosemount Oxymitter 4000, Инструкционный бюллетень

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IB-106-340
1-7
Components optional to the SPS 4000 include a
reference air flowmeter and pressure regulator.
The reference air flowmeter indicates the flow
rate of reference air continuously flowing to the
Oxymitter 4000. The reference air pressure
regulator ensures the instrument air (reference
air) flowing to the Oxymitter 4000 is at a con-
stant pressure [20 psi (138 kPa)]. The regulator
also has a filter to remove particulates in the ref-
erence air and a drain valve to bleed the moisture
that collects in the filter bowl.
Brass fittings and Teflon tubing are standard.
Stainless steel fittings and tubing are optional.
Also, disposable calibration gas bottles are avail-
able as an option or can be purchased through a
local supplier.
c. Operation. The SPS 4000 works in conjunction
with the Oxymitter 4000’s CALIBRATION
RECOMMENDED feature to perform an auto-
calibration. This feature automatically performs a
gasless calibration check every hour on the
Oxymitter 4000. If a calibration is recommended
and its contact output signal is set for
“handshaking” with the sequencer, the Oxymitter
4000 sends a signal to the sequencer. The se-
quencer automatically performs a calibration
upon receiving the signal. Thus, no human inter-
face is required for the automatic calibration to
take place.
1-5. MODEL 751 REMOTE POWERED LOOP
LCD DISPLAY. The display provides a simple,
economical means to obtain accurate, reliable, and
remote indication of important process variables. This
display operates on the 4-20 mA line from the
Oxymitter 4000 (Figure 1-6).
Refer to Model 751 remote powered loop LCD man-
ual for calibration and wiring.
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Figure 1-6. Model 751 Remote Powered Loop
LCD Display