Cameron NUFLO MC-III, Руководство пользователя

Страница: 58 / 120

58
Section 4 MC-III™ Panel Mount Flow Analyzer
The time-base portion of the Rate display can be configured in one of four preprogrammed engineering units:
per day, per hour, per minute, or per second. Users can specify decimal point position, from no decimal up to
0.001 of a unit, using the slide bar on the Turbine Input screen.
Important: If the volume portion of the Rate display is to be measured in user-defined units, the
K-Factor unit must also be entered as “pulses per unit.” For more information, see
Entering a Calculated Divisor, page 27
.
Input Type/Sensitivity Configuration
The MC-III Panel Mount accepts either a turbine input or a pulse input. When the turbine input is selected, the
user can also specify one of three sensitivity levels (low, medium, or high) to help minimize noise interference
in the signal reception. A “low” sensitivity setting will detect a signal of approximately 20 mV peak-to-peak,
while a “high” sensitivity setting will detect only signals that exceed 40 mV, peak-to-peak.
When a pulse input is selected, no sensitivity setting is required.
Cut-Off Thresholds
Periods of very low or interrupted flow can lead to inaccuracies in indicated flow totals. To help prevent these
inaccuracies, the user can establish cut-off thresholds to determine the minimum frequency and/or flow rate at
which a signal will be recorded.
The flow rate cut-off is a setpoint for the accumulation of flow time in the hourly and daily records, and can
be applied to either a turbine input or pulse input.
The frequency cut-off is reserved for the turbine input only. When the low-frequency cut-off is configured, the
MC-III Panel Mount will ignore inputs that are less than the user-entered value.
Calculation Period
The flow calculation period is the number of seconds that are allowed for calculating the flow condition. This
setting is easily adjusted with the “plus” and “minus” buttons on the screen, or the page-up and page-down
keys on your computer keyboard. Increasing this setting value results in flow rates with greater resolution.
This setting is also the time allowed for processing of display updates.