Ecotech EC9830 - Procedure Using Multiple Cylinders; Calibration Requirements When Over-Ranging Is Employed

EC9830 CO ANALYZER OPERATION MANUAL
3-12 98307600 Rev. C-1
Note
The R
2
value is a correlation factor that relates to
the similarity between the data points. Values close
to 1 indicate a linear relationship, whereas a value
close to zero will show a random distribution of
data.
The calibration is accepted if:
 The gradient (m) falls between 0.98 and 1.02
 The intercept (b) lies between ±0.3.
 The correlation (R
2
) is greater than 0.9995
Reject the calibration if the above criteria are not met. If the calibration fails
perform a leak check, check zero air scrubbers and consult the EC9830 service
manual for troubleshooting assistance.
3.2.3 Procedure Using Multiple Cylinders
Use the procedure for the dynamic dilution method with the following changes:
4. Use a multi-cylinder system such as the typical one shown in Figure 3-2.
5. The flowmeter need not be accurately calibrated, provided the flow in the
output manifold exceeds the analyzer's flow demand.
6. The various CO calibration concentrations required in the multiple cylinder
method are obtained without dilution by selecting the appropriate certified
cylinders. The suggested method is to span the instrument at the highest
concentration, then perform a dynamic or multipoint calibration with the
remaining cylinders, in sequence.
3.3 Calibration Requirements When Over-Ranging Is Employed
If you are utilizing the over-ranging feature of the analog outputs, use the
following steps in conjunction with the procedure in section 3.2 to calibrate the
instrument.
1. Choose desired upper range limit for the normal monitoring range (RANGE).
2. Choose and set the desired upper range limit for the higher, over range (OVER
RANGE). A value between 2 and 5 times the RANGE value is recommended.
3. Set OVER RANGE to DISABLED to deactivate the over-ranging feature.