Maretron LLP FFM100 - Manual (Page 17)

Revision 1.2 Page 13
® ®
3.1.5 Configuring Channel #1 Allow Negative Flow
The M1RSP-2R-E8, M2RSP-2R-E8, and M4ARP-2-E8 fuel flow sensors are capable of
sensing flow in both directions. When this parameter is in the default state of “Yes”, the
FFM100 will report reverse flow on Channel #1 as a negative flow rate. If you do not wish to
see negative flow rates from the Channel #1 sensor, you may change this parameter to “No”.
When this parameter is set to “No”, the FFM100 will report a zero flow rate for Channel #1
when reverse flow occurs.
3.1.6 Configuring Differential Mode Allow Negative Flow
In differential mode, if no fuel consumption occurring but fuel is flowing through both the supply
and return fuel flow sensors, the resulting calculated net fuel consumption can result in a small
negative value. When this parameter is set to the default state of “No”, the FFM100 will report
this as a zero flow rate value. If you wish to see these small negative values transmitted by the
FFM100, change the value of this parameter to “Yes”.
3.1.7 Configuring Installation Description
You can configure the two installation description parameters with any text you wish. Examples
include date of installation, location, etc. NMEA 2000 diagnostic tools such as Maretron
N2KAnalyzer
®
can display this information.
3.1.8 Configuring NMEA 2000 PGN Enable/Disable
The FFM100 is capable of transmitting NMEA 2000
®
messages (or PGNs) associated with
monitored fluid senders. You may individually enable or disable each of these messages. You
may also change the rate of transmission of each of these messages if desired.
3.1.9 Restoring Factory Default Settings
Selecting this configuration option causes all stored parameters in the FFM100 to be reset to
the values they contained when the unit was manufactured.
3.2 Configuring the Device Label
Program this parameter with a text string which identifies this device. Maretron display
products will display this label text when you are selecting data to display.
3.3 Configuring the Operating Mode
The FFM100 can be operated in one of two selectable operating modes:
1. Differential Flow Rate (default) – in this mode, the FFM100 measures fuel
consumption of a diesel engine by measuring the flow rate of the fuel sent
from the fuel tank to the engine and the flow rate of the fuel returned from
the engine to the fuel tank, and computing the difference between these
two flow rates, with temperature compensation. This difference is the flow
rate of the fuel actually consumed by the engine, and is transmitted as a
single parameter over the NMEA 2000 network.
2. Two Individual Flow Rates – in this mode, the FFM100 can measure two
independent flow rates of any fluids – diesel, oil, water, etc., and transmit