J.P. Instruments Fuel Scan 450 Installation Manual - Manual (Page 2)

J.P.Instruments Fuel Flow Installation Manual
Report # 400
FS-450 Page 2 of 16
Rev A : Date 02/1/2002
1 Installation Instructions
General: A complete thorough familiarization and understanding of the system and this manual is necessary before
commencing the installation. All work must conform with A.C. 43.13.1A ch. 11 sec. 2, 3, 7. The accuracy of this
instrument depends entirely upon the accuracy of the data entered. A periodical checking of the actual fuel onboard
will eliminate the accumulation of errors due to evaporation leaks, etc.
Route the (Optional) External Warning Control Line: The wire from pin 4 on the J-1 (D-SUB 9) can be
connected to an external warning light or buzzer. This pin goes to ground when the display flashes a warning. The
current in this line must be limited to 0.25 amps (maximum). Exceeding this limit will damage the unit. Tie off this wire
if not in use as not too obstruct the freedom of the controls. The FS-450 can be connected in parallel to any existing
digital fuel flow system. When connected to an existing flow sensor pin 3 red is not connected. See drawing 450508.
Install the Instrument in the Panel: Locate a 2.25 diameter hole or 3.125 diameter in the instrument panel,
where you would like to mount the indicator per drawing 450124. The instrument configures itself automatically for
14/28 volt aircraft. The instrument is 1.5” deep less connectors and is 2.6 or 3.5 square behind the panel.
Route the Fuel Flow Transducer Wires: Route the fuel flow wires from the probes through the firewall
using fireproof rubber grommets and flame retarding silicone. Use an existing hole if possible. Following the existing
wiring harness. All wires must be routed away from high temperature areas (exhaust stacks, turbochargers, etc.).
Secure Probe leads to a convenient location on the engine, being sure there is sufficient slack to absorb engine
torque. It is essential in routing the fuel flow transducer wires not be allowed to touch metal parts of the air-frame or
engine since abrasion will destroy this wire. Connect wires in accordance with DWG 450508.
2 Placards and Markings
Do not use the PN 700900-1 Flow Transducer on aircraft with a gravity feed system .
Transducer Identification Markings
PN 700900-1 stamped on TSO label and Marked "20l " on the top of the unit,
PN 700900-2 stamped on TSO label and Marked "231" on the top of the unit.
PN FT4-8AEXS-LEA-2029 stamped on transducer side
The placard PN 700905
"Do Not Rely on Fuel Flow Instrument to Determine Fuel Levels in Tanks.”
Must be mounted on the aircraft instrument panel near the P/N 450000( ).
If the aircraft is equipped with a primary fuel flow gage, the following placard must be mounted on the
aircraft instrument panel near the P/N 450000().
"Refer to Original Fuel Flow Instrumentation for Primary Information.”