Emerson MICRO MOTION 2700 Manual de instalación Pagina 70

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60 Transmitter Configuration and Use: Series 1000 and 2000 Transmitters
Required Transmitter Configuration continued
6.6.2 Configuring the output scale
The frequency output scale defines the relationship between output pulse and flow
units. You can select one of three output scale methods, as listed in Table 6-11.
Frequency=flow
If you specify
Frequency = flow, you must also specify TV frequency factor and TV rate factor. TV
rate factor
is defined as the maximum flowrate appropriate to your application. TV frequency factor
can then be calculated using the following formula:
where:
Rate = maximum appropriate flowrate (
TV rate factor in configuration)
T = factor to convert selected flow time base to seconds
N = number of pulses per flow unit, as configured in the receiving device
The resulting
TV frequency factor value must be within the range of the frequency output (0 to
10,000 Hz).
If the
TV frequency factor value is less than 1 Hz, reconfigure the receiving device for a
higher pulses/unit setting.
If the
TV frequency factor value is greater than 10,000 Hz, reconfigure the receiving device
for a lower pulses/unit setting.
Table 6-11 Frequency output scale methods and required parameters
Method Description Required parameters
Frequency = flow Frequency calculated from flow rate as described
below
TV frequency factor
TV rate factor
Pulses per unit A user-specified number of pulses represents one
flow unit
TV pulses/unit
Units per pulse A pulse represents a user-specified number of flow
units
TV units/pulse
Model 1500 AN
Model 1700 AN
Model 1700 IS
Model 2500 CIO
Model 2700 AN
Model 2700 IS
Model 2700 CIO
FrequencyFactor
Rate
T
------------
N×=
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