SERVOPRO CHROMA Gas Analyser
10
04400001A / Revision 7
1.3 Description of Chroma Gas Analyser
1.3.1
Introduction
The SERVOPRO Chroma is a 19” rack mounted online trace gas analys
er,
shipped pre-configured and requires little operator intervention. The analyser
measures impurities in bulk gases, such as H
2
, O
2
, N
2
, Ar, CH
4
, CO, CO
2
and
NMHC impurities in H
2
, O
2
, N
2
, Ar or He background gas.
The analyser configuration - form factor, detector(s), column(s), and valves - is
application dependent. The analyser can be fitted with a number of detector types
–
Plasma Emission Detector (PED), TCD (Thermal Conductivity Detector), or
FID (Flame Ionisation Detector). The SERVOPRO Chroma consists of a master
chassis, which may be fitted with one or more secondary chassis, or a PC with one
or more secondary chassis, and may also have an auxiliary oven. The master
chassis/PC provides the User Interface and communications. Each master chassis
and secondary chassis is fitted with an electronic system to control its detector(s)
and data acquisition.
All instrument parameters are controlled by the SERVOPRO Chroma analytical
software package. Each impurity peak is reported on screen with its process value.
The software offers advanced diagnostic tools and trending features, to ease the
configuration parameter definition and support the trouble shooting process.
The analyser is provided with a 4-20 mA isolated output for each impurity peak
as standard (up to eight 4-20 mA outputs for the main chassis).
There are two operating ranges per peak with a user selectable multiplication
factor between ranges of 2, 5 or 10. There is a dry contact remote range
identification output for each impurity peak.
Two process alarm dry contact outputs are included, and two alarm set points per
peak can be entered. A fail-safe dry contact output is provided for the system
status alarm; this contact will be activated when there is a risk that the reported
value may prove unreliable.
There is an isolated digital input for a remote start function.
