Electronics International MVP-50T - Manual (Page 26)

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2.13 Install the P-300C Fuel Level Probes:
Install the P-300C (Capacitive) Fuel Level Probes in accordance with the aircraft manufacturer’s instructions.
2.14 Install the P-300M Magnetic Fuel Level Sender:
The MVP system can interface with an aircraft’s existing resistive fuel sensors via the RFLM-4 or these resistive fuel
level sensors can be replaced with the P-300M (Magnetic Float) Fuel Level Sender. The signal produced by the
P-300M Sender is a linear voltage output designed to work with
the MVP system.
The P-300M’s float arm and travel must match the aircraft’s
existing sender’s arm and travel. Due to the lack of information
from aircraft manufacturers, the existing sender may need to be
removed from the aircraft and sent to Electronics International.
In this way the P-300M’s float arm and travel can be matched
with the aircraft’s existing sender. Contact Electronics Interna-
tional for further information.
The P-300M has the same bolt pattern as resistive fuel senders. The P-300M requires three wires to interface
to the EDC (resistive senders only use one wire).
Note: Note: Note: Note: Note: Calibrating the MVP system to a fuel tank can compensate for nonlinearity in the tank’s shape and
nonlinearity in the resistive fuel level sensor. The MVP cannot correct for inconsistent or non-repeatable
signals from resistive fuel level senders. Unfortunately, many older resistive fuel level senders (and in some
cases, newer resistive senders) exhibit some of the following problems:
- Variation in the wiper-to-element resistance (CRV).
- Stick slip problems with bearings and wiper-to-element contact.
- Windup causing jumps in readings.
- Weak wiper tension.
- Loose or worn bearings, causing fluctuations in readings.
- Worn out wiper.
- Corroded wiper.
- Corroded or worn element.
- Build up of varnish on the wiper and element.
- Water logged floats.
If you find inconsistent or inaccurate fuel level readings (due to a defective resistive fuel level sender), you
must have the sender replaced. Inaccurate readings can lead to a dangerous situation. The MVP depends on
the fuel level sender for accurate fuel level information. Read the “Important Notice” in the MVP Operating
Instructions.
The P-300M is a float type fuel level sender that uses a magnet and pickup device to detect the float position
and produce an accurate signal for the MVP system. The P-300M has no wiper or resistive element and there
is no tension on the bearings. It is not subject to the many problems associated with resistive type senders.
The P-300M has nothing to wear out or affect inaccurate fuel level readings. Also, the P-300M does not
require electricity to flow through an element and wiper saturated in fuel.
3-Wire Cable