CiDRA SONARtrac HD VF-100 User Manual

Page 80

Page 10-5

20638-02 Rev 01

- Low Cutoff

: Setting at which the Pulse output will turn off.

Care must be taken to configure the multiplier and pulse width to allow
the full range of the pulse output to be:

1. Measurable by the user’s equipment. There may be a limitation
on the minimum pulse width the user’s equipment can detect.

2. Less than the maximum pulses per second allowed by the
transmitter.

The maximum number of pulses per second that can be output is
based on the selected Pulse Width (see table below):

Max Pulses = 500/Pulse Width

Table 15

Maximum Pulse Per Second Based On Pulse Width

‘Output Sel’ - Used to select the measurement to be output.
Selections are as follows:

- Flow Rate (VF)

: Outputs a frequency corresponding to flow rate.

- Flow Rate %

: Outputs a frequency corresponding to % of VF full-

scale range.

- Total Flow (Totalizer)

: Outputs a series of pulses corresponding

to the total number of flow units counted over the previous update
interval.

The Info>Configuration>Pulse Output selection on the transmitter
menu displays the currently configured max/min pulse range, and will
indicate an over range condition if one exists (i.e. settings exceed
maximum pulses per second capability).

‘Flow Rate’ and ‘Flow Rate %’ generate a different pulse output than
Total Flow. These will output a pulse frequency based on the current
measurement. The pulse width will vary in order to maintain a 50%
duty cycle pulse train.

Pulse Width

Pulse Per Second

Maximum

0.5 ms

1000

1.0 ms

500

20 ms

33 ms

15.15

50 ms

100 ms

Warning: Settings Produce > Max PPS!