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Instruction Manual
IM-106-5500, Original Issue
August 2005
CCO 5500
3-16
9. Calibration
From this option the two detector levels
may be displayed and a basic calibration
conducted. During Set Detectors the gas
cells are not moved; this gives an
immediate response for setting up the detector levels. The basic
calibration of the instrument is set by a 'CAL FACTOR' which is
calculated during a calibration routine. Press the ENTER key while this
is displayed and the following options are available.
a. Set Detectors
Both the D1 and D2 levels from the
receiver are displayed, and saturation
counts are also displayed. To give an
immediate response to any alterations
that are required, the gas cells are not moved during this operation.
b. Span Adjust
NOTE
The Span Factor is set at the factory by Rosemount Analytical; Do not adjust
it unless the instrument sensitivity is suspected. It is recommended that
before adjustments are made, the original value is recorded.
Instrument sensitivity can be adjusted
if a known concentration of
measurement gas exists between the
transmitter and receiver units, and
instrument sensitivity is suspected. If a problem arises with this,
please consult Rosemount Analytical.
The Span Factor may need adjusting if new gas cells or filters have
been fitted.
Refer to Span Factor Adjustment.
c. Calibrate
Re-enter Mode 5 Calibrate menu and
proceed to the calibrate option. The
basic calibration of the instrument can
be calculated from this routine. It is
preferable to conduct this operation with the plant shut down to
ensure a zero gas concentration within the duct. If this is not
possible, however, the instrument can calibrate to a known value of
the gas concentration - the calibration target.
5 CALIBRATE
5 D2 = 10534 # = 00000
D1 = 15000 # = 00000
5 Val = 250 –> 250ppm
Span Factor 1000
5 CALIBRATE
Calibrate