Rosemount 890, Инструкция по эксплуатации

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I
NITIAL
S
TARTUP AND
C
ALIBRATION
748460-A
3-11
Rosemount Analytical
January 2000
(in seconds) in which the analyzer responds to change. A different TIME CONSTANT
can be selected for each range.
To change or check the settings of the different range parameters, follow the steps in
the appropriate figure in this section.
Note: After changing a setting, press ENTER to retain the new setting in
nonvolatile memory. Settings stored in nonvolatile memory will be saved even in
the event of a power outage.
At any point in the sequence, the routine may be exited by pressing
SHIFT/ENTER.
The analyzer must be in LOCAL mode (L1, L2 or L3 appears in RUN mode
display) to change ranges in [RANGE=XXX] screen of Figure 3-6.
3.8 ANALYZER DIAGNOSTICS
Diagnostics are selectable through the MODE function. This function allows the source
current, detector signals (samples S
A
and S
B
, references R
A
and R
B
), +5 V, +15 V,
+12 V, and -15 V values to be displayed. It is recommended that the values for
samples S
A
and S
B
and , references R
A
and R
b
be recorded for future reference to
help track lamp life. See Figure 3-7.
3.9 ZERO CALIBRATION
The Model 890 Analyzer automatically calculates zero when the analyzer is in the zero
setpoint mode. Simply press ZERO (display notes [ZERO - WAIT
→
] and then [ZR =
XX PS = XX %]). (Ensure that zero gas is flowing through the cell for at least one
minute.) Then press ENTER (display notes [CALCULATING ZERO]). Zero is then set
for all three ranges, and the analyzer returns to Run Mode.
Note
When entering this function, ensure that zero calibration gas is flowing through
the analyzer. When entering this function for viewing purposes only, press
SHIFT/ENTER to exit without changing zero value.
To calibrate zero:
1. Allow system to warm up a minimum of one and a half hours.
2. Connect zero gas to the sample cell inlet at the back of the analyzer. Flow the gas
at a flow rate of 500 cc/min, as read on a flowmeter, for at least two minutes.
3. To calibrate the zero setting for the analyzer for each range desired, press ZERO
and then press ENTER.