Quick Start Guide
SERVO
PRO CHROMA/NANOCHROME/ULTRA Gas Analyser
44
04400003A_0
The dilution ratio is determined for each impurity, as follows:
1.
Turn off valve on span gas cylinder and allow to flow rate to stabilise for
approx. 5 minutes.
2.
Measure the flow F1 coming out of sample vent while analyser is controlling
the sample flow at the set point. Enter the value F1 in the calibration menu
(see section 1.9 and Figure 11).
3.
Turn on valve on span gas cylinder to the correct pressure (30 psig) and
allow flow rate to stabilise for approx. 5 minutes. Make sure that analyser
controls sample pressure to the set point.
4.
Measure the flow F2 coming out of sample vent. Enter the value F2 in the
calibration menu (see Figure 11). The analyser will calculate the Dilution
Factor (F2/(F2-F1)) and display it in the calibration menu.
5.
Repeat step 1 to 6 for all chassis.
CAUTION
A SERVOPRO Chroma/NanoChrome/Ultra may consist of multiple chassis.
Each chassis has its own internal dilution system which will require
verification of the dilution ratios for each relevant impurity.
To reduce the analyser purge time during start-up, it is
recommended to activate the dilution system valve for a few
minutes to purge dead volumes. This is important if the external
carrier gas line is contaminated.
The sample inlet can be changed from process to span using the calibration
menu. If the analyser has multiple chassis, the internal dilution system for each
chassis will change state at the same time. Refer to calibration section.
CAUTION
The internal dilution system dilutes the calibration gas using carrier gas.
Carrier gas is only consumed for dilution when the internal dilution system is
in use (valve activated). If sample inlet 2 is not connected to a calibration
bottle, it is important to install a cap on sample inlet 2. Otherwise, carrier gas
will be vented from sample inlet 2.
