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Comparing Edm 790 And Edm 900 Systems

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By Author: Joseph Polizzotto
Total Articles: 49
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This article helps you compare the two EDM’s and select the one that fits your requirements and your budget. Both these aircraft engine data monitoring systems are manufactured by J.P. Instruments.

EDM 900
(Usually between $3,000 and $5,000)


2-4 piston Aircraft Engine Monitoring
Includes Pre-wired Harness
Includes CHT & EGT Probe and Harness
Includes Oil Pressure Transducer and Harness
Includes OT Transducer and Harness
Includes Fuel Flow Transducer and Harness
Includes OAT Probe and Harness
Includes RPM Sensor and Harness
Includes Manifold Pressure Transducer and Harness
Includes Shunt 100 amp and Harness
Includes Volts V1 and Harness

Features Remote Access Display 8 Alpha Numeric Characters. Backup display.
Includes Plotting Software EZTrends ©
Capable of EGT Differential Span Hottest to Coolest
Capable of CHT Differential Span Hottest to Coolest
Shock Cooling on all cylinders
Accurate Lean and over lean Horsepower
GPS Interface to any GPS even hand-held
Fuel Efficiency, Fuel Used for the Trip
Fuel Used Since Fill up, Time to Empty
Distance to Empty
Fuel required to next Way Point or destination
Fuel Reserve at way point or destination
Flight Timer
Tach Timer, Engine Hours
Date, Zulu Time

The Engine Data Management 900 for aircraft has 4 operating modes; automatic, manual, Program and LeanFind.

More information here:

EDM 790
(From $7,055.00 to $8,255.00)


EGT & CHT 4 or 6 probes
Monitor and display of Volts
Monitor Shock cooling
Span (highest to lowest EGT)
EGT Normalize mode
LOP/ROP function
Power connector
All required Harness 20 ft
EZTrends Graphing Software free
Serial Data recording -25 hours
3 year Warranty
Full Instrument: Width 4.81 Height: 3.47 Depth: 3.56
Insert Size 3-1/8 in panel mount 3.56 deep. Width Above Panel .80 Weight: 1 LB.

Optional Functions include:
Fuel Flow,
Oil Temperature 1 & 2,
Turbine Inlet 2 (TIT-2),
Outside Air (OAT)
Carburettor Temperature (CRB).

Fuel Efficiency, Aircraft Fuel Flow Instruments Used for the Trip
Fuel Used Since Fill up, Time to Empty
Distance to Empty
GPS Interface to any GPS even hand-held
Fuel required to next Way Point or destination
Fuel Reserve at way point or destination
Data Port for downloading of data.
FAA approved graphic engine monitor with a full fuel flow system.
Extremely accurate temperature detection; ONE degree (even for EGT).
Paired with JPI’s “grounded” fast response probes.
Monitors the air craft engine every 2 to 255 seconds.

More information here:

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