48
SUPERtrol-I LE Flow Computer
Low Flow Cutoff
A value set at which any flow measurements read below this value will be ignored.
Low Pass Filter
A low pass filter passes low input frequencies while blocking high frequencies. In the ST1LE, this is the
maximum input count speed to be encountered in an application. It is expressed in counts per second (Hz).
Maximum Batch Preset
The Maximum Batch Preset allows the user to program the Maximum Batch value allowed to be entered by the
operator. If an operator should try to program a batch higher then this value, the unit will not allow the value to be
entered and will prompt the user with an error message saying that the Maximum Batch Preset has been exceeded.
Maximum Drain Time
The unit declares that a batch is “done” when the flow rate equals “0”. A flow rate may be present long after the
Preset Relay de-energizes due to slow reacting valves or leaky valves. The Maximum Drain Time allows the user to
enter an amount of time (0 to 99 seconds) to wait before declaring “Batch Done”. After the Preset Batch quantity
is reached, the unit will declare “Batch Done” when the flow rate is “0” or the Maximum Drain Time has expired.
The batch data will then be available for printing and datalogging.
NOTE:
A nonzero MAX DRAIN TIME value must be entered when using batch overrun compensation.
Max Window
The max. window time sets the maximum sample time (1 to 99 sec) for the ratemeter.
Operator Code
An operator password code which authorizes changes to the setup of the instrument but blocks access to the
Service/Calibration/Test mode. The operator code also blocks the clearing of the Grand Total.
Parity
A method for detecting errors in transmissions of serial communications data.
Preset
A set point used to trigger the relay outputs of the ST1LE.
Print Interval
The print interval allows the ST1LE to transmit information to the serial port at selectable time intervals.
Process Parameters
Any sensor information which has been scaled to engineering units including Flow, Temperature and Density.
Pulldown
(Input Termination)
The termination of an input at which the input is pulled down to ground through a resistor. Inputs that are
terminated by this method need to be driven high with a positive voltage pulse.
Pullup
(Input Termination)
The termination of an input at which the input is pulled up to a positive voltage through a resistor. Inputs that are
terminated by this method need to be pulled low with a sinking current or contact to ground .
Pulse Output
The pulse output of the ST1LE is available for remote accumulation of the total or sent to peripheral devices, such
as a PLC. The output can be scaled using the Pulse Output Scaling Constant.
Quad
Abbreviation for Quadrature. Quadrature signals are used for direction control. Two flowmeter signals are output
with a 90° phase shift. The counter counts UP when channel A precedes channel B, and counts DOWN when
Channel A lags Channel B.
Quick Update %
This feature is used to disable the rate averaging filter when a significant change in the flow rate occurs. The user
can enter the percent of change needed to be detected to disable the averaging feature. This is especially useful
