Operation – Yokogawa 415 Steam and Gas User Manual

Page 16

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3. OPERATION

The Model 415 uses a low power CMOS microprocessor to perform all
measurement and control functions.

The instrument is fully programmable with all operating parameters and
calculation constants user programmable (see Section 5 entitled Calibration for
information on programming). All parameters and constants are stored in a
non-volatile memory which retains data without battery backup for a minimum of
10 years.

3.1 FRONT PANEL OPERATION

The alphanumeric display provides a clear indication of which parameter is
displayed and the engineering units.

During Calibration, the value which is to be normally displayed can be
programmed as the DEFAULT display. For example, if Mass is required and is
programmed as the DEFAULT display, then pressing the RATE key will show
the Mass flowrate, and pressing the TOTAL key will show the Mass total.

The scaled pulse out, 4-20mA output option and high/low alarm option are also
based on the DEFAULT display selection. For example, the 4-20mA output
would be a re-transmission of the Mass flowrate, if the DEFAULT display is set
to Mass.

The DISPLAY key can be used to step through the data which can be displayed,
as follows:

Gas Flow

Corrected Volume

(Rate & Total)

Mass

(Rate & Total)

Temperature & Pressure

14 Operation

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