Commissioning
Manual CWD 2005
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Manual CWD2005.doc
Remove the transport packing from the gas pressure regulator. Polystyrene foam is
located beneath the removable regulator cover and must be removed before use.
Check the process and calibration gas connections for tightness and correct
connection. Check any carrier gas or second calibration gas connection if supplied.
Switch on the power switch. After a short delay while the unit powers up, the main
screen will illuminate. An information field in the top right hand corner will show
status. After a short purge period the gas valve will open and the ignition will start
automatically (Note: This is only possible with the door closed as a safety switch
inhibits ignition with the door open). Once the flame is lit, the door can be opened
without creating a flame out condition.
The device will start up and after short warm-up period (20-30 minutes during first
commissioning from cold) will reach the correct process gas calorific value.
All software, measuring ranges and any other specified options have been pre-set at
the factory (see datasheet and memory stick supplied with the unit).
Following start-up, the gas pressure indication on the screen will read 4 mbar, and
the cooling air differential pressure gauge (blue) will also show 4 mbar. If the gas
pressure needs adjustment add or subtract weights from the precision weight loaded
regulator. The air pressure should need no adjustment by the user, as control is by
the variable speed air fan. Check the specific gravity differential pressure indication
on the screen reads 4 mbar and adjust if necessary, see section 9.2.4 for more
details.
After the warm-up period, the instrument will show the Calorific Value, Wobbe Index
Value and Specific Gravity, numerically in the display and a visual trend will be
developed onscreen.
The menu system is described in Chapter 6, and this describes how the user enters
their application specific values into the various menus. Be sure to read this chapter
to gain some familiarity with the equipment before any ad-hoc experimentation or
adjustment to the menus.
If the unit should fail to power-up, open the main door and check inside the door that
the power supply ribbon cable connections are firmly attached to the power supply as
sometimes these have detached during rough shipment and handling.
If questions arise during start-up contact the factory with serial # for further advice.
The unit is supplied factory calibrated and field calibration should only be attempted
by users, with a source of calibration gas with known values.
See section 6.2.1.2 for more details.
Check the calibration gas data and enter the values in the correct menu. If only the
gas component percentage is known, the correct Wobbe Index value must be
calculated from the individual components. The use of cylinders with vendor supplied
certified values for BTU and Specific Gravity is recommended as the accuracy of the
calibration depends on the accuracy of the gas standards used for calibration.