J.P. Instruments EDM 960 Twin Primary Installation Manual - Manual (Page 13)

FAA Approved Installation Manual for the EDM-960 system Report No 909
Primary Engine Data Management System Page 13 of 46 Rev D
Date 2-6-2014
Slide the sleeve over the joint and secure with three tie-wraps.
1/4 x 4" sleeve
tie-wrap 3 places
The most common installation problems are related to poor quality terminations.
17. Wiring Markings
The EDM-960 is supplied with special Teflon insulated Chromel Alumel factory assembled wiring harness configured
for the correct number of cylinders. The wire harness is marked E1= EGT-1, C1= CHT-1, etc.
NOTE: Unlike most other EGT & CHT installations the probe wire length is not critical and should be trimmed to any
length as required for a clean installation. Do not extend the thermocouple wire with copper wire.
18. Exhaust Gas Temperature Probe (EGT) Installation
Use the J2 connector harness 700700 or 700702 labeled E1 through E4 or E6. Remove the existing EGT gage and
Probe. Replace with JPI probe M-111 in all exhaust stacks.
The Model M-111 Probe will fit any engines where the
existing holes in the exhaust stack are 1/8" to 1/4" in
diameter. If no hole exists, it will require the drilling of a
1/8" diameter hole and ream to fit. It is important that
each probe be mounted the same distance from its
exhaust stack flange. A nominal distance of 2 to 4
inches from the exhaust flange is recommended. If the
recommended distance is impractical because of
obstructions, slip joints or bends in the exhaust system
then position the probes a uniform distance from the
flange as space permits. Do not mount probes in slip
joints. Be certain to locate all holes BEFORE drilling to
ensure that nothing interferes with the probe, clamp,
screw or wire. Careful matching of probe position will
provide best temperature readings.
Insert the probe in the exhaust or previously drilled
hole so that the tip of the probe is in the center of the exhaust stream. Tighten the stainless steel clamp to a torque of
45 in/Lbs. Cut off the excess strap close to the screw.
2" to 4"
EGT probe
Drill no. 40
pilot hole,
then no. 30
hole.
CHT probe
exhaust stack