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Install
2.4.4
Analog output cables
In order to generate a 4-20 mA output, the analyzer must be left for 90 minutes to warm
up, and the analysis cell must be at the correct pressure.
The 4-20 mA outputs operate when the analysis cell is between 40 and 60 °C (104 and
140 °F) and the pressure is between 180 and 220 Torr. It is not essential to flow sample gas
through the system; nitrogen or atmospheric air is adequate for this test.
Procedure
With the analyzer at operating temperature and pressure, ensure that a current between
4 mA and 20 mA is generated on each 4-20 mA output, as listed in
This can be measured as a current with a multimeter.
2.4.5
Measurement valid flag
The measurement flag is normally open contact. It is simplest to test this with a
multimeter.
With the analyzer closed and compressed air applied as described in the startup procedure
(Section
the two contact wires (white).
Procedure
To test the Error state, shut off the sample gas and allow the pump to reduce the cell
pressure below 180 Torr.
At this point, the contact should close and there should be no resistance between the two
white wires.
WARNING!
FIRE AND EXPLOSION
In accordance with IEC 60079-0: 2011 Clause 30.
Do not open the Ex d enclosure unless the area is known to be free of flammable materials or
unless all devices are switched off.
Failure to ensure the area is safe or leaving the device powered on can cause an explosion or
fire and serious injury to personnel.
2.5
Commissioning
Once the sensor is fully installed as described above, commission it according to the
commissioning plan agreed on between you and Emerson.
30
3.3) when the system is operating correctly, an open contact is created between
Section
2.3.4.
CT5800
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