J.P. Instruments Slim Line Gauges Installation Guide - Manual (Page 14)

INSTALLING THE SLIM LINE® INSTRUMENT SERIES PAGE 14 OF 14
REV B
28) Troubleshooting
a) A negative temperature reading (- in front of the number) indicates reverse polarity on the red and yellow
thermocouple wire to probe.
b) Ohmmeter check. (Temperature instruments only) Remove the connector from the rear of the instrument
and measure the resistance of the probe lead pair. The reading should be about 10 ohms. At the connections
between the probe and the wiring in the engine compartment, the resistance should be about 2 ohms.
c) Ohmmeter check. (Oil pressure, Fuel pressure and Boom pressure instruments only) Measure the
resistance of the pressure sensors at the two terminals. With no pressure applied the resistance should be
about 10 ohms. Full pressure should read about 200 ohms, with intermediate pressures in between.
d) Temperature reading varying rapidly. Verify that the Instrument is grounded at the engine block for
single engine installations. If an adapter probe is being used insure that it is screwed in tightly. Remove the
factory original probe that is in the adapter and note if problem is resolved. If so an resistive ground exists
between the engine and the adapter probe. Check for a poor quality crimp between the probe and wiring.
e) Ammeter doesn’t read zero when no current is flowing. Check that there are no other connections to the
current shunt other than what is described in this manual. The Slim Line instrument should not be powered
from the shunt.
f) An alarm never occurs on the Volt/Amp indicator. Alarm will only show battery discharge. For a load
meter configuration, there will never be an alarm. There is no alarm for the voltage function.
Returns for repair should include a description of the problem symptom and conditions under which the
symptom occurred. Be sure to include your return address and phone number. Send instruments for repair to
J. P. Instruments, 3402-I West Mac Arthur, Santa Ana, CA 92704
29) Operation
The Slim Line instrument requires no operator interaction. Upon power-up, it will begin to display the measured
parameter. There are two red alarm indicators to the right of the numerical display. When an alarm condition is
detected, both indicators will flash simultaneously. These are the factory set alarm limits unless requested
otherwise.
EGT (Exhaust Gas Temperature Max. limit 2500
o F) 1650 o F
CHT (Cylinder Head Temperature Max. limit 600 o F) 450 o F
TIT (Turbine Inlet Temperature Max. limit 2500 o F) 1650 o F
OIL (Oil temperature Max. limit 600 o F) 230 o F
OAT (Outside Air Temperature Limit -40 to 300
o
F) No alarm
IAT/CRB (Induction Air Temperature Max. Limit 600 o F.) No alarm
VOLT (Voltage, 0 to 40 volts.) No alarm
AMP (Amperes –60 to +60 or –100 to +100) Negative 0.5 amps or higher
OIL P, (Oil Pressure 0 – 150 psi) 15psi
FUEL P (Fuel Pressure 0 – 30 psi) 4 psi
Boom P (Boom Pressure 0 – 150 psi) No alarm
MP (Manifold Pressure 0 – 40 inHg) 36 inHg
The entire display dims automatically depending on the ambient lighting.