dynasonics TFXL series - Totalizer Output Option; Frequency Output

Totalizer Output Option
TFXL meters can be ordered with a totalizer pulse output option. This option is installed in the position where the rate pulse
would normally be installed.
Totalizing Pulse Specifications
Parameter Specication
Signal One pulse for each increment of the totalizer’s least significant digit
Operation Normal state is high; pulses low with display total increments
Pulse Duration 30 mSec/minute
Source / Sink 2 mA maximum
Logic 5V DC
Table 5: Optional totalizing pulse output
Wiring and configuration of this option is similar to the totalizing pulse output for the TFXL meter variation. This option must
use an external current-limiting resistor.
TTL Pluse (+)
TTL Pluse (-)
TTL Pluse (+)
TTL Pluse (-)
O N
1
Figure 26: Totalizer output option
Frequency Output
The frequency output is a TTL circuit that outputs a pulse waveform that varies proportionally with ow rate. This type of
frequency output is also known as a Rate Pulse output. The output spans from 0 Hz, normally at zero ow rate to 1000 Hz at
full ow rate (see "Flow Tab" on page 35).
Turbine Simulation
Turbine Output
Turbine Output
O N
1
Figure 27: Frequency output switch settings
The frequency output is proportional to the maximum flow rate entered into the meter. The maximum output frequency is
1000 Hz. If, for example, the MAX RATE parameter was set to 400 GPM then an output frequency of 500 Hz (half of the full
scale frequency of 1,000 Hz) would represent 200 GPM.
In addition to the control outputs, the frequency output can be used to provide total information by use of a “K-factor”. A
K-factor simply relates the number of pulses from the frequency output to the number of accumulated pulses that equates to
a specific volume.
Inputs/Outputs
Page 27 April 2016 TTM-UM-00369-EN-03