User manual for flow meter with pulse input SPI-94
(L or m
3
) and
“Ftunit”
(min., sec. or h), with resolution defined by
“F PrEc”
(max. 5 digits after
decimal point). Pulses delivered to device's input (Figure 4.10) are recalculated according with
procedure showed below:
•
if duration of low or high level (between pulses) is lower than time defined by parameter
“FrEq”
(see Tab.7.1 page 28), these pulses are recognized as noise (or bouncing) and will
be ignored
•
if duration of both levels are in acceptable range, but input frequency is higher than defined
by parameter
“FrEq”
, device goes to alarming state - relays and current output are
switched to their alarm states defined by parameters
“ALArmS”
of particular menus. In
alarm state flow counter displays
”-Hi-”
message, in place of flow result.
•
In all other cases (while frequency and pulses duty cycle gets acceptable values) input
pulses are delivered to internal prescaler. The prescaler (see description of parameter
“PULSEL”
) should be set to value equal to the quantity of pulses per one litre.
Frequency after prescaler is recalculated accordingly to user defined unit (parameters
“F unit”
and
“Ftunit”
), and after that final flow value (in litres or cubic meters per hour,
minute or second) is obtained. This result is displayed on the display and is used to
determine states of relays and current output, additionally the result is accessible via
RS 485 interface as a set of holding registers.
If input frequency is in acceptable range but result is longer than 6 digits, warning
message
“-Ov-”
is displayed in place of the result. In that case parameters
“
F unit
”
,
“Ftunit”
and
“F PrEc”
should be corrected to obtain proper result.
Total flow is displayed in units defined by parameter
“t unit”
(L or m
3
), with resolution
defined by parameter
“t PrEc”
(max 3 digits after decimal point). If total flow counter
overflows, warning
“tot ov”
is displayed alternatively with maximum counter value. Total flow
counter can be zeroed using
“Clrtot”
option of
“totAL”
submenu, electrically via
total flow
clearing input
(see page 30) or via RS-485 interface by writing of value 0000h to any of total
flow counter result registers.
Switching between current flow rate and total flow counter can be done by
pressing [
FL] button
. Kind of displayed value is signalised by
“
Σ
”
LED. It lights, while total
flow is displayed.
Functions of [^] i [v] buttons depend on kind of presently displayed value:
•
If instantaneous flow (flow rate) is displayed ( LED named
“
Σ
”
is off) user can check main
thresholds values. After pressing
[^]
or
[v]
button, name of the threshold (e.g.
”rELPr1”
)
and his value will be displayed on the display in alternating mode.
If
[^]
or
[v]
will be pressed in 5 sec again, the next threshold will be displayed, else the
device comes back to the measurement mode. If a
free access
is enabled (see description
of
”SECu” menu
), user can change the value of particular threshold pressing button
[ENTER]
(see:
PARAMETERS EDITION
).
If particular parameter has been changed and confirmed in quick view mode, its new
value is displayed in alternating mode with parameter name by few seconds.
Confirmed changes may be checked or user can switch viewed parameter pressing
[^]
or
[v]
button.
•
If total flow counter value is displayed ( LED named
“
Σ
”
is on), and its length exceeds 6
16
i
i
