190-01115-01 G3X™/G3X Touch™ Avionics Installation Manual
Rev. AV Page 21-33
21.3.10.3 Floscan Fuel Flow Sensor Installation
The information below is taken from the Floscan Series 200 Flow Transducer Application Notes:
1. The inlet and outlet ports in series 200 flow transducers have ¼” NPT threads. Use only ¼” NPT
hose or pipe fittings to match. When assembling fittings into the inlet and outlet ports, DO NOT
EXCEED a torque of 15 ft. lbs. (180 inch lbs.), or screw the fittings in more than 2 full turns past
hand tight WHICHEVER HAPPENS FIRST. Floscan Instrument Co., Inc. will not be responsible
for cracked castings caused by failure to use ¼” NPT fittings, over-torquing the fittings, or assem-
bling them beyond the specified depth.
2. A screen or filter should be installed upstream of the flow transducer to screen out debris which
could affect rotor movement or settle in the V-bearings. As turbulence upstream of the transducer
affects its performance, there should be a reasonable length of straight line between the transducer
inlet and the first valve, elbow, or other turbulence producing device.
3. Install the flow transducer with
wire leads pointed UP to vent bubbles and make sure the rotor is
to
tally immersed in liquid. For maximum accuracy at low flow rates, the transducer should be
mounted on a horizontal surface.
Some additional mounting considerations should be noted as follows:
1. When installing the NPT fittings into the transducer, use fuel lube such as EZ TURN © or an
equivalent thread sealer. Teflon tape should NEVER by used in a fuel system.
2. To minimize inaccuracies caused by turbulence in the fuel flow, the sensor should be mounted with
approximately 5-6” of straight tubing before and after the sensor. If special circumstances exist that
prevent an extended length of straight tubing before and after the sensor, then a gently curved hose
may be acceptable. 45 degree or 90 degree elbow fittings should NOT be used immediately before
or after the sensor.
3. Specific sensor mounting location i
s left to the builder. Ideally, the sensor should be placed before
th
e fuel distribution device (carburetor or fuel injection distribution device).
4. On a Continental fuel injected engine, the transducer must be located between the metering unit
and the flow divider valve.
5. Sensor wires should be connected to the appropriate inputs on the GEA 24/GSU 73 as referenced
in the G3X interconnects in Section 26
through Section 29.
The Floscan 201B-6 (201-030-000) fuel flow sensor K-Factor value can range from 28,000 to 31,000 pulses/
gallon.
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