J.P. Instruments Slim Line Gauges User Manual

INSTALLING THE SLIM LINE® INSTRUMENT SERIES PAGE 1 OF 14

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Applicable to

Slim Line® Temperature, Pressure, and

Volt-Amp Instruments.

I 3 5 5

EGT °F

READ THIS FIRST

The following notes apply to a new installation. Read this section before proceeding.

a) The JPI warranty found in the back of this manual clearly states that JPI will replace defective parts under

warranty, but does NOT cover labor to remove or install any parts from or to the aircraft.

b) This installation will require some parts unique to your aircraft that are not supplied with the kit, (including

but not limited to tie-wraps, hoses and fittings). Acquire all the necessary parts prior to beginning the installation.

c) This manual is applicable to temperature, pressure and volt-amp instruments. Refer only to those sections

that pertain to your particular instrument(s).

d) Determine the locations of all holes before drilling to ensure that nothing interferes with the probe, clamp,

clamp screw or wire.

e) Provide service loops at the instrument.

f) Power up and test the instrument before installing it in the instrument panel.

g) Thermocouple wire length is not critical. Trim to required length, allowing for service loops at the engine so

that the probe can be swapped to adjacent cylinder positions for troubleshooting purposes.

h) Dress all wires away from high temperature components such as exhaust stacks.

i) Never splice thermocouple wire using copper wire. Use only K-type thermocouple wire. Soldering

thermocouple wire is not recommended, but if you must, solder using zinc chloride flux such as Nokorode brand – rosin flux won’t work.

j) Observe correct polarity on all probe wires. Connect like colors together (red to red [-], yellow to yellow

[+]). Two-terminal pressure sensors have no polarity restrictions.

k) The most common cause of probe problems is poor terminal crimps. Crimp ring terminals with AMP part

48518 crimp tool or equivalent.

1) Installation Overview

The overall installation procedure is as follows:

1. Power the instrument on the bench to verify it was received in working order. Set the alarm limits, if

necessary.

2. Install the instrument in the instrument panel.

3. Install the probe or sensor in the engine compartment.

4. Connect the connectors to the instrument.

5. Run the wires from the instrument in the instrument panel through the fire wall to the engine

compartment. Dress the wires to the probe or sensor.

6. Cut the excess length off the wires and connect to the probe or sensor.

7. Verify instrument operation.

January, 1998

INSTALLING THE SLIM LINE® INSTRUMENT SERIES PAGE 2 OF 14

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J. P. INSTRUMENTS PO Box 7033 Huntington Beach, CA 92615

2) Initial Bench Check

Connect the red wire to +12V or +24 V and the black wire to power return. Verify that the display lights up. If the alarm limit has to be changed, it will be easier to do it now before the instrument is installed in the aircraft. See the procedures near the end of this manual.

3) Installing the Instrument

Installation should be in accordance with Advisory Circular AC43.13-1A. Identify the location for the instrument on the instrument panel that can accommodate 2.75 inches wide by

2.75

2.35

2.03

1.2 inch high instrument, and 3.5 inches clearance behind the instrument panel. Check the rear clearance with the connectors attached to the instrument.

If more than one instrument is to be installed, the horizontal center-to-center spacing must be at least 2.75 inches, and the vertical center-to-center spacing must be at least 1.2

0.51

instrument panel cutout

0.46

0.97 ref

inches. Two instruments can be installed in a 3¼ inch hole. Contact JPI for an optional bezel.

0.169 D 2 plcs

R0.125

4) Exhaust Gas Temperature (EGT) Probe Installation

Determine the locations of all holes before

EGT probe Drill no. 40 pilot hole, then no. 30 hole.

exhaust stack

2" to 4"

CHT probe

distance from the flange as space permits. Careful matching of probe position will provide the best temperature readings. Do not mount EGT probes in slip joints.

drilling to ensure that nothing interferes with the probe, clamp, clamp screw or wire. The model M-111 EGT probe will fit any engine having existing holes in the exhaust stack of between

0.125 in. and 0.250 in. If no hole exists, drill a

0.125 in. hole and ream to fit. For multi-EGT probe installations, it is important that each probe be mounted a uniform distance from the exhaust stack flange. A nominal distance of 2 to 4 inches from the exhaust flange is recommended. If the recommended distance is impractical due to obstructions, slip joints or bends in the exhaust system, then position the probes a uniform

1.20

Insert the probe in the exhaust stack hole such that the tip of the probe is in the center of the exhaust stream. Tighten the stainless steel clamp and torque to 45 in/Lbs. Cut off excess strap close to the screw.

5) Turbine Inlet Temperature (TIT) Probe Installation

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 wastegate side of the turbine.

INSTALLING THE SLIM LINE® INSTRUMENT SERIES PAGE 3 OF 14

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Clamp

Seal Washer

Thimble

note orientation

of slot

Probe

Position probe

in approximate

center of

exhaust

6) Cylinder Head Temperature (CHT) Probe, Bayonet Installation

The bayonet probe 5050-T has a captive 3/8-24 boss that is screwed into the base of the cylinder. The probe has a screwdriver slot to facilitate tightening.

7) Cylinder Head Temperature (CHT) Probe, Spark Plug Gasket Installation

If there is no socket hole for the EGT probe on any cylinder or the aircraft is equipped with Tanis heaters, use a spark plug gasket probe.

The spark plug gasket probe, PN M-113, replaces the standard copper spark plug gasket on one spark plug. Choose the upper or lower spark plug, the one that provides the best correlation with the other temperature probes. Due to the spark plug location, the gasket probe may read 25oF higher or lower than the factory probe. Place the probe on the plug that receives the most direct cooling air.

8) Oil temperature (OIL) Probe Installation

front view

Oil Probe Location

Alternate Oil Probe Location

Lycoming Engines

Lycoming Engines: The PN 400505-L probe is for all Lycoming direct drive engines and is installed in the

right (passenger side) front oil galley by removing the existing 1/8 NPT plug on the passenger side of the engine and inserting the optional JPI oil probe supplied with the kit.

INSTALLING THE SLIM LINE® INSTRUMENT SERIES PAGE 4 OF 14

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Alternate Oil Probe Location

front view

Alternate Oil Probe

Location

Oil Probe Location

Continental Engines

Continental Engines: The PN 400505--C probe is for all Continental direct drive engines and is installed in the

left (pilot side) front oil galley by removing the existing 3/8 or 1/8 inch NPT plug (see figure above) located on the front, pilots side of the engine. Insert the optional JPI oil probe supplied in the kit. For 3/8 inch NPT installations, use the supplied brass adapter. An alternate location is on the top, front of the engine on the pilot’s side, where the probe is inserted vertically. There are two 1/8 NPT plugs close together. Install the probe in the position that is above and to the rear of the nearby position. Check for oil leaks before first flight.

9) Radial Engines

Radial engine exhausts require a larger EGT clamp (supplied) to fit the 2.5 inch exhaust pipe. The EGT probe is installed using the same technique as on 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 from 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. Do not route the wire adjacent to or in the ignition harness. Do not extend thermocouple wires with copper wire.

10) Outside Air Temperature (OAT) Probe Installation

Install the OAT probe, PN 400510 in the airframe manufacturer’s recommended location. If

aircraft sheet metal

shield tube used to secure probe

this information is not available, place the OAT probe in clean airflow such as in a cabin air scoop or

probe

washer

below the underside of the wing away from engine heat or exhaust. In this case it is recommended that the installation be done similar to the antenna installation instructions of AC 43.12-2a Acceptable Methods, Techniques and Practices.

The outside aluminum shield tube is used to both hold the probe in place and shield it from radiated heat. When testing the OAT shield the sensor from direct sunlight and engine heat.

INSTALLING THE SLIM LINE® INSTRUMENT SERIES PAGE 5 OF 14

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11) Induction Air (IAT), Compressor Discharge Temperature Probe Installation

The Induction Air Temperature probe, (IAT), is installed just after the inter-cooler and the Compressor Discharge Temperature (CDT) just before the inter-cooler. The probe is the same as an EGT probe and installed similarly to an EGT probe. A large clamp is supplied to fit around the air port leaving the inter-cooler. Alternately a 1/8 NPT fitting is available.

12) Carburetor (CRB) Probe Installation

Locate the access hole in the carburetor near the butterfly valve. Remove the screw plug and screw the CRB probe into the carburetor throat.

13) Manifold Pressure (MP) Sensor Installation

Install a T-fitting (not supplied) in the aircraft’s MP gauge line in the cockpit near the MP gauge. Install

connector

from engine

MP Sensor

T-fitting

MP gage

the MP sensor on the T-fitting. Later, you will connect the MP sensor to the wiring using the 4-pin connector supplied.

14) Oil Pressure, Fuel Pressure, Boom Pressure Sensor Installation

Mount the two ring-spade lugs to the two terminals on the sensor using the hardware supplied. Mount the pressure sensor to the pressure line using a 6 inch flexible hose and fittings (not supplied) as depicted in the drawing below. Use tie-wraps to mount the pressure sensor an engine mount structure. Do not mount the sensor directly to the engine. Connect the other end of the hose to the existing pressure line, with a T-fitting if necessary. Later, you will connect the pressure sensor to the two pressure sensor wires.

AN-910-1D

1/8 NPT coupling

pressure

sensor

AN-816-4D 1/8 NPT to flared

MIL-H-8794 hose MS-24587 fitting (AEROQUIP 491, 2 req'd)

to engine

fitting

flexible tube 6 inch (AEROQUIP 303)

DO NOT MOUNT SENSOR DIRECTLY TO ENGINE

15) VOLT/AMP Shunt Installation

Install the current shunt in the electrical system.

Charge/Discharge configuration. The shunt can be installed between the master contactor and the main bus in which case it will be in the ammeter configuration showing battery charge and discharge. Be sure that the positive side of the shunt is connected to the main bus in the ammeter configuration. The alarm will be triggered by a discharge condition.

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