dynasonics TFXL series - Mounting Rail Installation

Output Tab
The entries made in the Output tab establish input and output parameters for the transmitter. Select the appropriate function
from the pull-down menu and click Download. When a function is changed from the factory setting, a configuration error
1002 will result. This error will be cleared by resetting the transmitter microprocessor from the Communications/Commands/
Reset Target button or by cycling power to the transmitter. Once the proper output is selected and the microprocessor is
reset, calibration and configuration of the modules can be completed.
Figure 35: Output tab
Parameter Meaning Description
Min Flow Controls how the
4-20 mA output is
spanned
The 4-20 mA Output menu applies to all transmitters and is the only output choice for Channel 1.
The Flow at 4 mA / 0 Hz and Flow at 20 mA / 1000 Hz entries set the span for both the 4-20 mA output and the
0…1000 Hz frequency output.
The 4-20 mA output is internally powered (current sourcing) and can span negative to positive ow rates. This
output interfaces with virtually all recording and logging systems by transmitting an analog current that is
proportional to system ow rate. Independent 4 mA and 20 mA span settings are established in rmware using
the ow measuring range entries. These entries can be set anywhere in the – 40…40 fps (–12…12 mps) range.
Resolution of the output is 12 bits (4096 discrete points) and can drive up to a 900 Ohm load. When powered by
a DC supply, the load is limited by the input voltage supplied to the instrument. See Figure 24 on page 26 for
allowable loop loads.
Flow at 4 mA / 0 Hz
Flow at 20 mA / 1000 Hz
The Flow at 4 mA / 0 Hz and Flow at 20 mA / 1000 Hz entries set the span of the 4-20 mA analog output and the
frequency output. These entries are volumetric rate units that are equal to the volumetric units congured as
rate units and rate interval.
Example 1: To span the 4-20 mA output from –100…100 gpm with 12 mA being 0 gpm, enter these values:
Flow at 4 mA / 0 Hz = –100.0
Flow at 20 mA / 1000 Hz = 100.0
This setting also sets the span for the frequency output. At –100 gpm, the output frequency is 0 Hz. At the
maximum ow of 100 gpm, the output frequency is 1000 Hz, and in this instance, a ow of zero is represented by
an output frequency of 500 Hz.
Example 2: To span the 4-20 mA output from 0…100 gpm with 12 mA being 50 gpm, enter these values:
Flow at 4 mA / 0 Hz = 0.0
Flow at 20 mA / 1000 Hz = 100.0
In this instance, zero ow is represented by 0 Hz and 4 mA. The full scale ow or 100 gpm is 1000 Hz and 20 mA
and a midrange ow of 50 gpm is 500 Hz and 12 mA.
Max Flow Controls how the
20 mA output is
spanned
Test Enables calibration
adjustments
Allows a simulated flow value to be sent from the 4-20 mA output. By incrementing this value, the 4-20 mA
output will transmit the indicated current value.
Click Test to enable the Calibration and Test options.
Conguration Menu
Page 37 April 2016 TTM-UM-00369-EN-03