Dynasonics TFX Ultra Transit Time Flow Meters - Manual (Page 31)

Totalizing
Pulse Output
Option
Total P
ulse RxD
TB1
Isolated Output
Total Pulse
Internal
2.8k…10k
Pullup
Resistor
V
CC
100 mA
Maximum
Figure 28: Energy version auxiliary totalizer output option
Wiring and configuration of this option is similar to the totalizing pulse output for the flow only variation. This option must
use an external current limiting resistor.
Signal Strength Alarm
The SIG STR alarm will provide an indication that the signal level reported by the transducers has fallen to a point where flow
measurements may not be possible. It can also be used to indicate that the pipe has emptied. Like the rate alarm described
previously, the signal strength alarm requires that two points be entered, establishing an alarm deadband. A valid switch
point exists when the ON value is lower than the OFF value. If a deadband is not established and the signal strength decreases
to approximately the value of the switch point, the output may “chatter”.
Error Alarm Outputs
When a control output is set to ERROR mode, the output will activate when any error occurs in the flow meter that has caused
the meter to stop measuring reliably. See the APPENDIX of this manual for a list of potential error codes.
ALARM OUTPUTS
Page 31 March 2014