Meriam M2110P SMART PRESSURE GAUGE - Manual (Page 5)

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User’s Manual Dwg No 9R141-IR
2. Pressure Display
Indicators
During normal operation, the gauge displays the pressure value in large numerals, and the bottom of
the display shows the current Engineering Unit. The top of the display will show PRGM when the
gauge is in Program Mode (flashing when “view only”). For SetPoint models, the top of the display
will show SET1/SET2 to indicate activated outputs (or corresponding register opened in Program
Mode). For Current Loop models, the top of the display will show 4-20mA when the output is
enabled (or corresponding register opened in Program Mode). Finally, an ABS indicator illuminates
when an Absolute Isolated sensor is used.
Performance
The M2110P Smart Gauge retrieves analog data from its pressure sensor, and performs an analog-to-
digital (A/D) conversion for microprocessor-based data handling. The rate of A/D conversion will
typically be between 10 to 14 conversions per second, depending on the various operating conditions.
To make the display easier to read, only every fourth sample is updated on the display. (This results in
a display update rate of about 3 updates per second.) The internal calculations, outputs, and serial
interface are updated at the full conversion rate.
Resolution
The display is limited to 4½ digits, and the resolution of the data (decimal point positioning) is defined
by the range and sampling process. If a specific value will not fit on the 4½ digit display, however, the
auto-range feature will decrease the resolution to allow the value to fit the display (for example,
increasing past 199.99 becomes 200.0). The auto-range feature restores the decimal resolution with a
built-in deadband of 5 display counts (for example, 200.0 must drop to 199.95 before the two-digit
decimal resolution is restored).
Note that the full scale display indication during power-up will not necessarily have the same decimal
resolution found during actual pressure monitoring.