Emerson MMI-20019043 Manuel D’Utilisation

Set LRV and URV as desired.

•

LRV

 is the value of mA Output Process Variable represented by an output of 4 mA. The

default value for LRV depends on the setting of mA Output Process Variable. Enter LRV in
the measurement units that are configured for mA Output Process Variable.

•

URV

 is the value of mA Output Process Variable represented by an output of 20 mA. The

default value for URV depends on the setting of mA Output Process Variable. Enter URV in
the measurement units that are configured for mA Output Process Variable.

For best performance:

•

Set LRV 

≥ LSL (lower sensor limit).

•

Set URV 

≤ USL (upper sensor limit).

•

Set these values so that the difference between URV and LRV is 

≥ Min Span (minimum span).

Defining URV and LRV within the recommended values for Min Span, LSL, and USL ensures that the
resolution of the mA output signal is within range of the bit precision of the D/A converter.

You can set URV below LRV. For example, you can set URV to 

50

 and LRV to 

100

.

The mA output uses a range of 4–20 mA to represent mA Output Process Variable. Between
LRV

 and URV, the mA output is linear with the process variable. If the process variable

drops below LRV or rises above URV, the transmitter posts an output saturation alarm.

Each option for mA Output Process Variable has its own LRV and URV. If you change the
configuration of mA Output Process Variable, the corresponding LRV and URV are loaded and
used.

All mass flow variables

–200.000 g/sec

200.000 g/sec

All liquid volume flow variables

–0.200 l/sec

0.200 l/sec

All density variables

0.000 g/cm

3

10.000 g/cm

3

All temperature variables

–240.000 °C

450.000 °C

Drive gain

0.00%

100.00%

Gas standard volume flow

–423.78 SCFM

423.78 SCFM

External temperature

–240.000 °C

450.000 °C

External pressure

0.000 bar

100.000 bar

Integrate the meter with the control system

103