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6-42
1020NFM-1D
Section 6
6.7.2 SET ALARM LEVELS
The [Set Alarm Levels] menu allows you to select setpoints for system alarm functions. Alarms appear
locally on the LCD digital display. In addition, you can use the [Relay Setup] menu to assign those
functions to the system’s relays. You may select from flow rate, liquid interface (Vs) and liquid aeration
alarm functions. Entry of all alarm setpoints is accomplished using the selected rate units. You can
enable or disable a Makeup Alarm Latch to keep the makeup alarm active until you reset it manually by
an <Fn>6 simultaneous key press on a PC keyboard or via the KeyPad.
To access the [Set Alarm Levels] menu press the <Right Arrow>.
Hi Flow
The [Hi Flow] alarm menu cell allows you to set the HI alarm relay trip-point.
To set the Hi Flow alarm:
To activate numeric entry press the <Right Arrow>.
Use PC numeric keys or KeyPad to enter the Hi Flow alarm setpoint in the selected flow rate
units.
To store data press <ENTER>.
Low Flow
The [Low Flow] alarm menu cell allows you to set the LO alarm relay trip-point.
To set the Low Flow alarm:
To activate numeric entry press the <Right Arrow>.
Use PC numeric keys or KeyPad to enter the Low Flow alarm setpoint in selected flow rate
units.
To store data press <ENTER>.
Interface Vs m/s (meters-per-second)
The meter continuously measures liquid sonic velocity (Vs) and tracks changes in this parameter
dynamically. It can compare sonic velocity differences in real-time. Its sonic velocity detection is so
sensitive, it can quickly distinguish between two different liquids flowing through the same pipe. To set
the interface alarm, you select a detection setpoint that falls in the middle of the Vs values of the two
liquids.
For example, if Liquid “A” has a sonic velocity of 1249 m/s, and Liquid “B” has a sonic velocity of 767 m/
s, then you should enter 1008 m/s for the interface setpoint. The Interface Alarm becomes active when
the measured Vs meets or exceeds the reference value you enter in this menu cell.
NOTE: The valid Interface Vs range is: 400 to 2100 m/s.
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