CMM USER'S MANUAL (E2.51)
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2.5.2 Signals
Alarm signals, System error, Service request, Maintenance, Concentration and Result Valid are
transferred to the control room from connection bar as free relay contacts. Measuring data 4-20 mA
and remote signals are active and electrically isolated to 500 V. Analog output scales can be set in
the CMM MAUI software.
2.5.3 Gases
The system is connected to instrument air (6-8 bars). The air consumption of the system is
approximately 60 l/min. Instrument air hose 8 mm OD is connected to XN3.
2.5.4 Sample line
When connecting a sample line, it should be remembered that nameplate is on the cabinet side.
Sample line is exported to the cabinet though the inlet which located at the top of the cabinet. Inside
of the cabinet will only be a line branched parts. Attaching the probe should be ensured that probe can
be pulled out of the duct without removing the sample line. Sample line is attached 30 cm intervals by
appropriate cable shelf brackets. The minimum bend radius of the sample line is 30 cm. When the
sample line is installed must be ensured that line does not bend too much.
The sample line’s shorter heated branch is connected to the analyzer and the longer one to the test
gas generator. Connectors must be thermally insulated with insulation rings. Electrical and signal lines
and gas tubes are connected according to
Table 1
and
Table 2
.
2.5.5 Probe
Before the probe installation select the optimum sampling point in accordance with general guidelines
or agree on a sampling point with the responsible authorities. Place the sampling point in such a way
that there is sufficient space for installation and removal of the probe. Easy access to the probe must
be ensured to facilitate later maintenance work. Make sure the installation flange has at least 3
degrees downwards orientation compared to the stack.
Figure 3. The probe installation
Probe power supply, valve controls, alarm cables and gas tubes are placed inside the sample line.
Wires are connected to the terminal box, which is located below the probe. It is beneficial to have
instrument air and air pistol near the probe on maintenance point of view (Figure 3 and Table
2
).
