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Model 300E Carbon Monoxide Analyzer
Instruction Manual
CALIBRATION PROCEDURES
P/N 04288 REV: A
131
7.3.1.
Zero/Span Calibration on Auto Range or Dual Ranges
If the analyzer is being operated in Dual Range mode or Auto Range mode, then
the High and Low ranges must be independently calibrated.
When the analyzer is in either Dual or Auto Range modes the user must run a
separate calibration procedure for each range. After pressing the
CAL
,
CALZ
or
CALS
keys the user is prompted for the range that is to be calibrated as seen in the
CALZ
example below:
SAMPLE
RANGE = 50.0 PPM CO =??.??
< TST TST > CAL
CALZ
CALS
SETUP
ZERO CAL M
RANGE = 50.0 PP CO =1.23
< TST TST >
ZERO
CONC
EXIT
WAIT 10
MINUTES
Or until the
reading
stabilizes and
the
ZERO
button
is displayed
Analyzer enters
ZERO CAL
Mode
See Table 5-1 for Z/S
Valve States during
this operating mode
SAMPLE
RANGE TO CAL: LOW
LOW
HIGH
ENTR SETUP
SAMPLE
RANGE TO CAL: HIGH
LOW HIGH
ENTR
SETUP
Continue Calibration as per
Standard Procedure
Once this selection is made, the calibration procedure continues as previously
described in Section 7.2. The other range may be calibrated by starting over from
the main
SAMPLE
display.
7.3.2.
Use of Zero/Span Valves with Remote Contact Closure
Contact closures for controlling calibration are located on the rear panel CONTROL
IN connector. Instructions for setup and use of these contacts are found in
Section 6.7.2. When the contacts are closed for at least 5 seconds, the instrument
switches into zero or span mode. The remote calibration contact closures may be
activated in any order. It is recommended that contact closures remain closed for
at least 10 minutes to establish a reliable reading.
The instrument will stay in the selected mode for as long as the contacts remain
closed. If calibration is enabled, the M300E will re-calibrate when the contact is
opened, then go into SAMPLE mode. If calibration is disabled, the instrument will
return to SAMPLE mode, leaving the calibration unchanged.