14 Programming
4. PROGRAM PARAMETERS
Note: The instrument defaults out of the program mode if no programming entries are made after 4minutes.
4.1 PIN No. Program Protection
Any user defined PIN number other than 0000 will engage the program protection feature, failure to input the
correct PIN number will deny the ability to change any of the program parameters but will allow the user to step
through and view the existing program parameters.
Only one PIN number may be set but this can be changed at any time after gaining access through PIN entry.
A second back up PIN number is installed at the factory should the programmed PIN be lost or forgotten.
( refer bottom of page 16 for the back up PIN No. )
4.2 Resetting Accumulated Total
Resetting the accumulated total can only be done in the program mode.
4.3 Engineering Units
Select from available Engineering units to right of the display (refer clause 1.4), for other engineering units set
display to show no engineering units & program a suitable K-factor.
4.4 K-factor (scale factor)
Enter K-factor at S-Fact, up to 5 whole numbers & 3 decimal numbers can be entered using the arrowed keys.
4.6 Rate response
Adjustable response (rate dampening) is available to smooth out fluctuating flow input signals in order to provide
a stable rate display. Most input signal are reasonably stable and need only a low setting value of 001 to 004. The
response number (ranged 001~999) represents the number of pulse intervals (duration between each pulse) that
the processor averages and displays the rate as calculated.
As a general rule it would be best to apply a response number which is a multiple of the number of pulses a meter
produces for each cycle of its primary measuring element, for example a rotating element may produce 4 pulses
per revolution so 004, 008, 012 or 016 would be ideal response settings whereas a turbine meters with high
resolution pulse outputs would require response settings like 050, 100, 200 or in some cases involving high
frequency pulse outputs eg. 500hz, the response number would be set to say 999.
4.7 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 0.25hz, 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 frequency pulse outputs.
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 frequency value.
Programming 15
4.8 Display priority The large digits at the top of the display can be programmed to show either flow rate or
resettable total. When flow rate is selected at the top display the rate key can be used to cycle between rat e,
reset total & accumulate total, in this mode the instrument will default from rate to reset & accumulative totals after
1 minute, external power must be applied if required to display rat e at top display continuously.
4.9.1 Flow Alarms ( The RT must be externally powered as per page 12 ) Two flow alarm FET (transistor)
outputs may be programmed for Low & High flow alarms. An optional plug in alarm board is available having dual
SPDT 5 amp electro-mechanical contacts.
4.9.2 Flow Alarm Deadband
An adjustable deadband (reset differential) provides a trip buffer zone about the set point in order to overcome
alarm “chattering” when the flow rate is fluctuating close to the alarm set point. Deadband is entered as % of each
set point value (refer to page 17 for an example).
