Operation
VA 550 English V1.21 Page 43 of 53
8.3.4 Pulse /Alarm
Setup → Sensor Setup→ Pulse/ Alarm
8.3.4.1 Pulse output
The maximum frequency for pulse output is 50 pulses per second (50Hz).
The Pulse output is delayed by 1 second.
Table 1 Maximum flow for pulse output
Entering pulse values that are not allow a presentation to the full scale value, are not allowed. Entries are
discarded and error message displayed.
The galvanically isolated output can be defined as
pulse- or alarm output.
Selection of field „Relay Mode” with key „>“ and
change modus by pressing key „OK“.
For alarm output following units could be chosen:
kg/min, cfm, ltr/s, m³/h, m/s, °F, °C and kg/s.
„Value“ defines the Alarm value, „Hyst.“ defines
the desired hysteresis and with „Hi-Lim“ or. „Lo-
Lim“ the alarm settings when the alarm is
activated
Hi-Lim: Value over limit
Lo-Lim: Value under limit
For the pulse output following units could be
chosen: kg, cf, ltr and m³. The pulse value
definition to be done in menu „Value“ . Lowest
value is depending on max. flow of sensor and the
max frequency of pulse output of 50Hz.
With „Polarity“ the switching state could be
defined. Pos. = 0→ 1 neg. 1→ 0
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