ELIS PLZEŇ a. s., Luční 425/15, 301 00 Plzeň, Czech Republic, Phone: +420/377 517 711, Fax: +420/377 517 722 Es90420K/c
Permanently closed (open)
These modes are only used for servicing purposes.
Menu: Output functions, press the key / Output 1 (2) function, press the key /Permanently closed
(open),
press the key.
This will return the display to the menu item “Output 1 Function” or “Output 2 Function”.
To return to the basic configuration menu, press the key.
Pulse outputs
In any of the pulse modes, a pulse will be generated as soon as defined (pre-set) liquid volume passes
through the meter sensor. The pulse mode requires specification of the following three parameters: pulse
width “t
u
“, minimum time gap between two successive pulses “t
d
“ and liquid volume per pulse “V”.
This mode provides for integration of the flow rate
values in time. As soon as pre-set liquid volume V
passes through the meter, an pulse of width t
u
is
generated. After each pulse, a gap of at least t
d
follows. If, after elapsing of the t
d
period, liquid volume
V has not yet passed through the sensor, the output
remains inactive. If the volume passed is equal to or
greater than V, another pulse plus gap are
immediately generated. Should the pre-set volume V
pass before the end of the previous pulse, the non-
generated pulse will be stored in an accumulator with
the capacity of 255 pulses. Should the pulse
accumulator overflow, an error message will be
generated. To ensure correct operation of the meter
pulse function, it is necessary to set the pulse output
parameters so that the expected pulse frequency shall
correspond to the pulse width and gap length selected.
Pulse generation principle
It holds: maximum pulse frequency = 1 / (t
u
+ t
d
)
The volume per pulse parameter can be set within the range of 0.001 to 1,000,000 litres. The pulse width
and gap length can be set at 10 to 2,550 ms in steps of 10 ms. The setting procedure consists
of selecting numbers from 1 to 255 on the meter display. Multiplied by 10, the figure shows the pulse width or
gap length in milliseconds.
From the above it follows that the maximum pulse frequency is 50 per second.
Regarding the flow rate conditions (see below), pulses can be generated in three different modes. During the
t
u
periods, the output is closed.
Pulse frequency Pulse frequency Pulse frequency
Flow rate Flow rate Flow rate
Pulses for |Q| Pulses for Q+ Pulses for Q-
Menu: Output functions, press the key / Output 1 (2) function, press the key / Pulses for |Q|, press the
key. The display will read “Pulse Width [1] xxx“. Move the cursor using the key, and increase/decrease
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