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FW-F013-A-M_v0404_01_EN.docx
2.4
SPAN
With the span, the flowmeter signal is converted to a quantity. The
span for flow rate is determined on the basis of the selected
measurement unit, decimals and time unit at 20mA. The more
accurate the span, the more accurate the functioning of the system
will be.
Example 1
Calculating the span for flow rate
Let us assume that the flowmeter generates 20mA at a flow rate of
2,481.3 Liters/minute, the selected unit is "Liters" and time unit
"minute". The span is 2481.3. Enter for SETUP - 2.4: "24813" and for
SETUP - 2.5 - decimals "1".
Example 2
Calculating the span for flow rate
Let us assume that the flowmeter generates 20mA at a rate of 652.31
USGAL per hour, the selected unit is USG and the time unit is minute.
The span is 652.31 / 60 minutes is 10.87183 (GPM). Enter for SETUP
- 2.4: "10872" and for SETUP - 2.5:
“3”.
2.5
DECIMALS SPAN
This setting determines the number of decimals for the Span
(SETUP 2.4). The following can be selected:
0 - 1 - 2 - 3 - 4 - 5 - 6
Please note that this SETUP - influences the accuracy of the Span
indirectly. This setting has NO influence on the displayed number of
digits for "flow rate" (SETUP 2.3)!
3.3.4
EXPLANATION OF SETUP-MENU 3 - ALARM
SETUP
FUNCTIONS
AND
VARIABLES
3
ALARM
3.1
FLOW ZERO
When the flow rate signal is zero (below 4mA), then it is possible to
ignore or disable the low flow rate alarm. The following settings can
be selected:
DEFAULT:
in case of a low flow rate alarm and no signal, it will
switch the alarm output and indicate the alarm on the
display.
NO RELAY:
in case of a low flow rate alarm and no signal, it won't
switch the alarm output but will indicate the alarm on
the display only.
IGNORE:
in case of a low flow rate alarm and no signal, it won't
switch the alarm output and nothing will be indicated
on the display.
3.2
ALARM VALUE LOW
FLOW RATE
The low alarm is set with this setting. An alarm will be generated as
long as the flow rate is lower than this value.
With value 0.0 this function is disabled.
3.3
ALARM VALUE HIGH
FLOW RATE
The high alarm is set with this setting. An alarm will be generated as
long as the flow rate is higher than this value.
With value 0.0 this function is disabled.
3.4
DELAY TIME ALARM
LOW FLOW RATE
An alarm generated by SETUP 3.
2 “low” can be ignored during X-time
period. If the actual flow rate is still incorrect after this delay time, then
an alarm will be generated.
3.5
DELAY TIME ALARM
HIGH FLOW RATE
An alarm generated by SETUP 3.
3 “high” can be ignored during X-
time period. If the actual flow rate is still incorrect after this delay time,
then an alarm will be generated.
3.6
ALARM OUTPUT
TRANSISTOR /RELAY
One transistor or relay output is available to transmit the alarm
condition. Assign with this function the type of alarm to be transmitted:
low flow rate alarm, high flow rate alarm or both alarms.
