16 programming
6.2 Program levels 14~24 ( Model RT12 only )
Operation 5
2. OPERATION
2.1 Accumulative Total
Accumulative total can be reset at L2 in the program mode. The accumulative total can be
displayed momentarily or continuously through use of the front panel ACCUM TOTAL key.
Momentary display
: Accumulative total is displayed only whilst the key is held pressed.
Latching display : To have the accum. total display latch when key is pressed simply
press & hold the ACCUM TOTAL key for 10 seconds, the display will then latch each time the
key is pressed. Holding the accumulative total key again for 10 seconds will revert this key
function back to a momentary action.
2.2 Resettable Total ( also see page 18 for remote reset feature )
The display toggles between Rate & Total when the RATE-TOTAL key is pressed.
Pressing the RESET key whilst displaying total will cause the total to reset to zero.
2.3 Rate display
When rate is displayed the leading three alpha characters on the left of the display “flash ”
the time base for rate eg. rate /SEC. rate /MIN. rate /HR. or rate /DAY. Decimal points float
to provide good resolution & rangeability.
The minimum input frequency for rate display is 0.3hz reducing to 0.1hz If the low frequency
cut-off is set to 0.1Hz (see below).
2.4 Low frequency cut-off
The low frequency cut-off is most commonly set to 0.0Hz (disabled) other than to:
1) To display rate for input frequencies below 0.3hz, for example setting the cut-off at 0.1Hz
the rate will continue to display for input frequencies as low as 0.1Hz (one pulse every 10
seconds), such conditions often apply to flowmeters with low resolution pulse outputs (low
frequency) or flowmeters with a high operational turndown (maximum to minimum flow rate).
2) Inhibit the integration & registration of “apparent flow” which at times may be encountered
on mobile installations where the movement of the vehicle or dead heading a pulsating pump
may cause spurious flow signals which are not attributed to actual flow.
3) Inhibit the integration & registration of flow at input frequencies below what is considered
the minimum accurate flow rate of the primary flow element (flowmeter).
Caution: If the low frequency cut-off is set to any value other than 0.0Hz then the integration
of rate and total will cease at frequencies on or below the set value (HERTZ).
2.5 Inhibit total (see wiring schematic page 18)
With the remote “inhibit total” switch closed the RT with display flow rate but at the same time
will inhibit the resettable & accumulative totalising functions.
occurs when the flow falls
below the set point, High flow alarm occurs
when the flow goes above the set point.
2) Deadband (Reset Differential), provides a
buffer zone about the alarm set point in order
to avoid alarm output “chattering ” on & off
when the flow rate is hovering about an alarm
set point.
The % deadband applies above the Low set
point and below the High set point. Deadband
is set as a percentage of each set point.
Eg: 5% deadband at a low alarm set point of
100 L/hr will cause a low alarm when the
flow drops to 100 L/hr, the alarm will not
switch off until the flow increases above
105 L/hr.
Alarm outputs
YES
L14 ANALOG OUTPUT REQUIRED Y / N
4 ~ 20mA Y - N
L15 ENTER FLOW RATE AT 4mA
XXXXX.XXX
L16 ENTER FLOW RATE AT 20mA
program return
L17 ALARM OUTPUTS REQUIRED Y / N
ALARMS Y - N
L24 SET DUAL INPUT FUNCTION
A + B A - B A
B
ENTER NUMBER PULSES PER
Ltr m3 kg gal lb (unit) FOR INPUT B
00000.001 - 9999999.9
L22 DUAL INPUTS REQUIRED Y / N
DUAL Y - N
L18 ENTER FLOW RATE LOW ALARM
XXXXX.XXX
L20 ENTER FLOW RATE HIGH ALARM
L19 ENTER LOW ALARM DEADBAND %
BAND XX %
L21 ENTER HIGH ALARM DEADBAND %
YES
NO
holding the prog. key for 3 se
quick tracks to the END of the program
Ltr / SEC
( litres / second )
To Next Page
Loading...