INPUTS/OUTPUTS
The TFXL meter is available in two general congurations:
• The standard TFXL meter is equipped with a 4…20 mA output and a rate frequency output.
• The TFXL meter is also available with a totalizing pulse output option.
Standard 4…20 mA Output
The 4…20 mA output interfaces with most recording and logging systems by transmitting an analog current signal that is
proportional to system ow rate. The 4…20 mA output is internally powered (current sourcing) and can span negative to
positive ow/energy rates.
200
100
300
400
500
600
700
800
900
1000
1100
10 12 14 16 18 20 22 24 26 28
Supply Voltage (VDC)
Operate in the
Shaded Regions
Supply Voltage - 7 VDC
0.02
= Maximum Loop Resistance
Figure 24: Allowable loop resistance
4-20 mA Return (-)
4-20 mA Output (+)
4-20 mA Ground
4-20 mA Output
Figure 25: 4…20 mA output
The 4…20 mA output signal is available between the 4…20 mA Output and Signal Ground terminals as shown in Figure 25.
Batch/Totalizer Output
Totalizer mode configures the output to send a 100 mSec pulse each time the display totalizer increments divided by the
TOT MULT. The TOT MULT value must be a whole, positive numerical value. This output is limited to 1 Hz maximum.
For example, if the totalizer exponent TOTL E is set to E0 ×1 and the totalizer multiplier TOT MULT is set to 1, then the
output will pulse each time the totalizer increments one count, or each single, whole measurement unit totalized.
If the totalizer exponent TOTL E is set to E2 ×100 and the totalizer multiplier TOT MULT is set to 1, then the control output
will pulse each time the display totalizer increments or once per 100 measurement units totalized.
If the totalizer exponent TOTL E is set to E0 ×1 and the totalizer multiplier TOT MULT is set to 2, the control output will
pulse once for every two counts that the totalizer increments.
Inputs/Outputs
Page 26 April 2016TTM-UM-00369-EN-03
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