Installation manual

GEM INSTALLATION MANUAL DOCUMENT No. 070906 REV. 1.4
INSIGHT
INSTRUMENT CORP. 15 BOX 122, FORT ERIE, ONTARIO, L2A 5M6
Installing the Fuel Flow Signal Adapter (for Aircraft with an existing Flow Sensor)
The GEM is supplementary for fuel flow. Aircraft equipped with existing FF sensors may or may not be
compatible with the GEM's Fuel Flow signal inputs.
An existing sensor may be part of a primary FF Instrument or it may be supplementary. If the existing FF
sensor is primary it should remain in the aircraft to preserve the primary FF instrumentation.
If the existing FF sensor is not part of a primary FF instrument then it may be desirable to remove the existing
FF sensor and install the Insight FF sensor as detailed above for aircraft without existing FF sensors.
If the existing FF sensor is going to be retained, it may be connected to the GEM through the use of the
Insight Fuel Flow Signal Adapter (FFSA). The Insight FFSA works with most pulse-signal type FF sensors
but compatibility with other manufactures' fuel flow sensors cannot be assured.
To connect a GEM to an existing fuel flow sensor/fuel computer system use Insight Fuel Flow Signal
Adapter P/N 610C-025. Use Insight wiring diagram #101116. The GEM's K-factor must match the K-factor
of the FF sensor to correctly measure fuel flow. Use the GEM's Configuration Page to set the required K-
Factor.
Connections for RS-232 Data Communications (G3 and G4 only)
The GEM is supplementary for aircraft equipped with a compatible GPS system may be connected to the
GEM's RS-232 communications ports. The GEM can transmit Fuel data in one of several common formats to
the GPS. The GEM can receive navigation data from the GPS. Refer to the following installation drawings for
wiring details. Refer to the GPS system manufacturer for configuration of the GPS to transmit and receive
data.
Aircraft equipped with a TAS-1000 Air Data Computer may be connected to the GEM to datalog in-flight air
and fuel data. The GEM and TAS-1000 must be wired to share the pulse FF signals and RS-232 data. Refer
to the following installation drawings and the TAS-1000 Installation Manual Doc. No. 1000-402.
Wiring Considerations
The GEM is supplied with a factory-assembled EGT/CHT(/TIT) wiring harness configured for the
specified number of cylinders and required length (for each engine). The harness edge connector
contains a polarization pin that mates with a slot in the display’s printed circuit board. This prevents
improper engagement of the connector.
Before installing, confirm that the factory fabricated harness connector matches wiring diagram,
Drawing # 1200-018. All the red thermocouple wires should be on one side of the connector.
The GEM circuit boards are supported during shipment by small anti-static shipping restraints.
Leave these restraints in place during the installation of the display and remove only prior to
inserting the harness edge connectors.
The EGT and CHT wire length is not critical and may be trimmed to any length as required to fit each
probe.
CAUTION: Splicing of the thermocouple wire is not recommended. The thermocouple wire alloys are
not compatible with soldering.