J.P. Instruments EDM 960 Twin Primary Installation Manual - Manual (Page 14)

FAA Approved Installation Manual for the EDM-960 system Report No 909
Primary Engine Data Management System Page 14 of 46 Rev D
Date 2-6-2014
Position probe
in approximate
center of
exhaust
Probe
Clamp
Thimble
note orientation of
slot
Seal Washer
RADIAL ENGINE EGT
Radial engine exhaust, require a larger EGT clamp (supplied) to fit the 2.5 inch exhaust pipe. The EGT probe is
installed in the same fashion as a Lycoming or Continental engine and should be placed between the exhaust pipe
flange and the accumulator at a distance of 2 to 3 inches form the engine exhaust flange. Cylinder head temperatures
are measured with a spark plug gasket type probe placed under the front sparkplugs. Front spark plugs will read 15 to
20 degrees cooler than the rear plugs. Refer to the engine manufactures recommended location. Do not route the
EGT/CHT harness in with the ignition harness. Do not extend the yellow thermocouple leads with copper wire.
19. Turbine Inlet Temperature (TIT) Probe Installation (optional)
Use the J1 connector harness 790200 and insert the yellow wire into the connector pin 16 and the red wire into pin 17.
The standard TIT probe PN M111-T with a #48 clamp is placed in the exhaust stack accumulator to a maximum depth
of 1/2 inch and approximately 4 inches from the turbine inlet if possible, on the waste-gate side of the turbine.
19.1 Using the Factory original TIT Probe
The factory installed TIT probe (K-calibration) is compatible with the JPI EDM-960 System. Connect the JPI wire
marked TIT. Replacement probes should be purchased per part number from the aircraft manufacturer.
The EDM-960 permits you to remove the factory installed TIT indicator and leave the TIT probe installed. Connect the
JPI wire marked TIT directly to the probe noting color polarity. The TIT probe should now have only the JPI leads
attached to it. No calibration of the EDM-960 is necessary.
20. Cylinder Head Temperature (CHT) Probe Installation
Use the J2 connector harness 700700 or 700702 labeled C1 through C4 or C6. The JPI probe is a bayonet probe P/N
5050-T that has a captive 3/8-24 boss that is screwed into the head of each cylinder.
For Indicator replacement, replace your existing CHT probe and adapter, a bayonet or screw in type with one supplied
by JPI. Install the probe on the same cylinder from which you removed the original equipment probe. Your current CHT
probe is installed in the hottest cylinder as determined by the airframe manufacturer.
RADIAL ENGINE (CHT) SPARK PLUG GASKET
The spark plug gasket probe, P/N M-113, replaces the standard copper spark plug gasket on one spark plug. The
probe is usually placed on the Rear plugs. After many removals the probe may be annealed for re-use. Heat to 1100
o
F and quench in water.