Emerson Rosemount CT5100 Reference Manual page 56

Install
May 2020
5.4.7 Pressure sensor
The pressure sensor monitors the pressure in the analysis cell.
To test that it is functioning, check that a pressure reading is displayed under pressure on
the Display Controller as described in
The reading will be approximately 760 Torr at atmospheric pressure. If desired, cap off the
gas inlet and use an external pump to evacuate the cell. Verify that the pressure drops as
expected.
NOTICE
A Torr is a non-SI unit of pressure, defined as 1/760 of standard atmospheric pressure, and
is equal to the fluid pressure of 1 mm of mercury.
5.4.8 Analog output cable
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 will operate when the analysis cell temperature and pressure are
within the required test range. It is not essential to flow sample gas through the system;
nitrogen or atmospheric air will be adequate for this test.
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. This can either be measured as a
current with a multimeter, or as a gas concentration through the control station.
5.4.9 Seal glands
Where poured seal glands are a local industry requirement for cable termination, they
should be made in accordance with the manufacturer's instructions once acceptance tests
have been made on the system to ensure that the analyzer does not need to be removed.
5.4.10 Commissioning
Once the sensor is fully installed as described above, it should be commissioned in
accordance with the commissioning plan agreed between Emerson and the customer.
56
Pressure and Temperature
Reference Manual
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