EGT-1
EGT (Exhaust Gas Temperature)
Gauge
Operating Manual – English 1.02
Introduction
The EGT-1 is a single channel fully programmable digital EGT (Exhaust Gas Temperature) gauge.
The EGT-1’s high accuracy is due to it’s built in thermocouple linearization curves and cold junction compensation
techniques. Temperature probes can be common J or K type thermocouple probes as used in EGT sensors.
Temperatures can be displayed in degrees Celsius or degrees Fahrenheit from -100ºC to 1200ºC (-148ºF to 2192ºF).
The EGT-1 also offers a programmable EGT high alarm as well as the maximum temperature reached is captured into
permanent memory. The EGT-1 also boasts a battery voltage display with programmable low/high alarm, a built in hour
meter and service interval timer.
1 Features
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EGT (Exhaust gas temperature) monitoring with user settable high alarm
Includes linearization of EGT K or J Type probes and is cold junction compensated for greater accuracy
Battery voltage display, the EGT-1 can measure voltages up to 30V (Can be used in 12V and 24V vehicles)
and contains a programmable low/high voltage alarm to automatically catch alternator failures, drive belt
failures and bad batteries
Hour meter display to determine actual vehicle ignition on time with 1/10 hour resolution
Built in service interval reminder based on vehicle ignition on time
Includes an audible alarm (The sound can be turned on/off e.g. for game viewing)
Includes a visual alarm (Built in red LED turns on when an alarm condition occurs)
External alarm output for remote indicators etc.
Sunlight readable backlit graphics LCD with adjustable contrast
On board voltage reversal and over voltage protection for harsh vehicle environments
SMPS (Switch mode power supply) for use in both 12V and 24V vehicles
Maximum values of all readings are recorded
Easy to use menu system for user parameter setup
1 year limited warranty
EGT-1 Operating Manual
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2 EGT-1 Layout
Audible alarm:
The audible alarm will sound
when an alarm condition has
been met. (The sound can be
turned on/off in the menu system
LED Alarm:
The LED will flash when an alarm condition
has been met.
Harness:
The harness connects to power,
the EGT thermocouple and the
external alarm contact.
Backlit graphics LCD display:
Backlight and contrast can be
ddjusted in the menu system
Up Button:
This button acts as the up button in the menu
system, or as the display maximum values during
the normal display mode
Down Button:
This button acts as the down button in the
menu system, or as the adjust contrast quick
key during the normal display mode
Enter/Menu Button:
Press this button during the normal display mode to access the menu system.
This button acts as the enter key once in the menu system
3 Main display
Minutes in 1/10 of an hour resolution.
(Increments every 6 minutes)
Hour meter
Battery voltage
Temperature unit
EGT temperature
EGT-1 Operating Manual
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3.1 Voltage display
The EGT-1 can measure the vehicles battery voltage in the range of 8V to 30Vdc. The EGT-1 has built in over-voltage
and reverse voltage protection and contains a programmable low/high voltage alarm to automatically catch alternator
failures, drive belt failures and bad batteries. If the supply voltage exceeds 30VDC then a voltage over-range warning is
displayed.
3.2 Hour meter
The hour meter is a useful instrument to display actual ignition on time for routine maintenance. The Hour meter is
displayed as hours and fractional minutes in 1/10 of an hour resolution (increments every 6 minutes). The hour meter can
be reset to zero in the calibration menu. The hour meter updates its internal minute counter every minute. If the unit is
turned on and off for a period of less then a minute, then the hour meter will not increment its internal counter.
3.3 EGT (Exhaust Gas Temperature) / Pyrometer
Few things will damage or kill a diesel engine like excessive exhaust gas temperatures, yet the EGT gauges are not
standard equipment fitted by the diesel engine manufacturers and are only available as an after market add on unit.
The EGT-1 can alert the driver of any situations where the EGT gets to high which could cause irreparable engine and or
turbo charger damage. The EGT can be affected by a too rich air/fuel mixture or an air intake problem. Air intake
problems could include a blocked/partially blocked air intake, a dirty air cleaner, high water temperatures etc. The EGT-1
EGT gauge could also save on fuel costs as the EGT is directly related to the air/fuel mixture.
The EGT probe can be installed on the exhaust manifold or immediately after the turbo. It is recommended to install the
EGT probe before the turbo as temperature differences of up to 200 ºC between the inlet and outlet of the turbo has been
measured under heavy loads.
Under normal driving conditions the EGT may vary between 250 ºC and 650 ºC. For most vehicles the Alarm limit should
be set to 720 ºC. Please be aware that if pushing the engine hard or driving up a steep hill, could cause your EGT to
exceed this temperature. If you have prolonged high EGT then it is recommended to immediately have it check out by a
qualified mechanic.
Madmans custom built thermocouple EGT probes are specifically designed for automotive use. The Madmans EGT
probes can handle temperatures up to 1300 ºC
3.4 Maximum Values Display
This display can be accessed by pressing the up key during the normal display mode.
Press the up button again to reset the maximum values to the current display values.
Note: The maximum values are stored in non-volatile memory and are
recalled on power-up.
EGT-1 Operating Manual
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3.5 Contrast Display
This display can be accessed by pressing the down key during the normal display mode.
This is a quick access key to the same contrast menu in the menu system.
4 Menu System
Use the up, down or menu/enter keys to navigate through the menu system.
WARNING: The EGT-1 must not be operated by the driver
when the vehicle is moving. All setups must be done prior to
driving the vehicle.
4.1 Exiting the menu system
Press the menu button when you see the exit menu screen to exit the menu. The EGT-1 will also
exit the menu if no key is pressed within 30 seconds.
EGT-1 Operating Manual
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4.2 Service Timer
This will reset the hour meter to zero
Enter the next time in hours that the EGT-1 must remind you that a service is due. The service
reminder message will appear for 5 seconds after the unit has switched on if the hour meter
hours are greater or equal to the service hour setting.
4.3 Volts Setup
Select whether you want the voltage low alarm to be turned on or off.
Enter the low voltage set-point for when the alarm must be activated. Any voltage below this
value will activate the alarm.
Select whether you want the voltage high alarm to be turned on or off.
Enter the high voltage set-point for when the alarm must be activated. Any voltage above this
value will activate the alarm.
4.4 EGT (Exhaust Gas Temperature) Setup
This allows the user to turn the alarm on or off.
EGT-1 Operating Manual
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Adjust the setpoint when the alarm must be activated.
Select whether the EGT thermocouple connected to the EGT-1 is a K-Type or a J-Type probe.
Select whether all the temperature readings must be displayed in degrees Celsius or in degrees
Fahrenheit.
4.5 Unit Setup
Select this menu option to adjust the display contrast.
Select this menu option to turn the backlight on or off
The sound of the audible alarm can be turned on of off.
5 Alarms
The alarm sound can be turned on or off in the display setup menu. This might be favorable for example during game
viewing. Please note that the alarm sound only becomes active 30 seconds after power is applied to the EGT-1.
The alarm output on the power connector is of a transistor open collector type. When it is turned on it will connect the
alarm output to ground. Maximum current through alarm output should not exceed 250mA.
6 Cleaning
The unit should not be cleaned with any abrasive substances. The screen is very sensitive to certain cleaning materials
and should only be cleaned using a clean damp cloth.
Warning: The EGT-1 is not waterproof, serious damage could occur if the unit is exposed to
water and or spray jets.
EGT-1 Operating Manual
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7 Specifications
Operating Temperature Range
Storage Temperature Range
Humidity
Power Supply
Current Consumption
Display
ADC
Alarm
EGT probe
EGT compensation
Alarm Contact
Dimensions
Enclosure
Non-volatile memory storage
Weight
-10ºC to 50ºC (14ºF to 122ºF)
-20ºC to 80ºC (-4ºF to 176ºF)
<85% non-condensing
8 to 30Vdc SMPS (Switch mode power supply) with built in 33V over voltage
and reverse voltage protection
approx. 40mA/10mA @ 13.8V (backlight on/off)
114x65 graphics LCD display. Contrast and backlight is user configurable
12 bit over sampled successive approximation
Red LED,an audible alarm and an open collector transistor output.
K-Type or J-Type thermocouple probes
K-Type and J-Type probe linearization with build in precision internal
temperature reference
Transistor open collector, Max current = 250mA
60mmx60mmx61mm (2.36”x2.36”x2.40”) (See attached dimensional drawing)
2.25” ABS, black in color, front or rear mounting
100000 write cycles
96g
8 Installation
DIY installation can be done but it is recommended that a professional automotive installer installs the EGT-1.
The use of an external 1A fuse is recommended. Please ensure that the supply voltage will not drop below 8V during
operation as this may result in incorrect readings. Be sure to install a reference connection between the ground terminal
of the instrument and the engine block. If the engine block is not connected to a good reference, readings may show large
errors. This reference connection must not be used as a ground line for other current users. A straight, good quality
connection is required that is not shared with anything else.
Warning: Do not install the unit in direct sunlight as this could cause the unit to exceed the
operating temperature and can cause damage to the unit.
8.1 Extending leads of probes and senders
Thermocouple leads as used with the EGT probes can be extended either with ordinary copper cable or with special
thermocouple extension cable. The choice of either depends on your desired accuracy. If it is possible in your installation
to ensure that both ends of a copper extension cable will be at the same temperature (or very close), then it is quite
possible to use the copper cable. In most open-air installations this will be the case. Should this not be possible or you
require best possible accuracy at all times, you can obtain a special thermocouple extension cable. This cable is made
from the same metals as your probes cable but uses ordinary plastic sleeving to save costs. In either case, ensure that
the cable is not routed close to sources of electromagnetic interference of any kind. The voltages present in this cable are
very small and are subject to changes applied by external fields. This can lead to false temperature indications.
EGT-1 Operating Manual
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8.2 EGT-1 Rear panel and connector layout
Connector Colour Codes
Red
Black
Purple
White
Orange
8 – 30 VDC
Ground
Relay Contact
- EGT probe (Red probe lead)
+ EGT probe (Yellow probe lead)
9 Warranty
This product carries a warranty for a period of one year from date of purchase against faulty workmanship or defective
materials, provided there is no evidence of misuse or evidence that the unit has been mishandled. Warranty is limited to
the replacement of faulty components and includes the cost of labor. Shipping costs are for the account of the purchaser.
Note: Product warranty excludes damages caused by unprotected, unsuitable or incorrectly wired
electrical supplies and or sensors, and damage caused by inductive loads.
10 Disclaimer
Operation of this instrument is the sole responsibility of the purchaser of the unit. The user must make themselves familiar
with the operation of this instrument and the effect of any possible failure or malfunction.
The manufacturer reserves the right to alter any specification without notice
DISTRIBUTED BY:
BRIAN COTTON DESIGNS CC
Postal Address: PO Box 1391
Muldersdrift
Gauteng
1747
South Africa
Website: www.madman.co.za
Email: [email protected]
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