Madman EMS-3 Operating Manual
Page 4
3.1 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 EMS-3 can alert the driver of any situations where the EGT gets too 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 EMS- 3
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 200ºC (392ºF) between the inlet and outlet of the turbo
has been measured under heavy loads.
Under normal driving conditions the EGT may vary between 250ºC (482ºF) and 650ºC (1202ºF). For most vehicles the
alarm limit should be set to 720ºC (1328ºF). Please be aware that pushing the engine hard or driving up a steep hill, could
cause the exhaust gas to exceed this temperature. If you have prolonged high EGT then it is recommended to
immediately have it checked out by a qualified mechanic.
Madman custom built thermocouple EGT probes are specifically designed for automotive use. The Madman EGT probes
can handle temperatures up to 1300ºC (2372ºF).
The EMS-3 can use K-Type or J-Type thermocouples to display the EGT temperature. The EMS-3 contains precision
instrumentation electronic circuitry to amplify and linearize the thermocouple sensor. The EMS-3 also has built in cold
junction compensation to make the EGT reading as accurate as possible.
3.2 Battery Volts
The EMS-3 can measure the vehicle's battery voltage in the range of 8V to 30Vdc and has built in over-voltage and
reverse voltage protection. The EMS-3 contains a programmable low/high voltage alarm to automatically catch alternator
failures, drive belt failures and bad batteries.
3.3 Pressure Display
The EMS-3 uses standard automotive pressure senders to display the pressure. The EMS-3 supports 2, 5 and 10 Bar
VDO senders, SENDO MPS 2, 5, 7, and 10 bar senders, 0.5-4.5V senders, 4-20mA pressure senders or a custom user
definable pressure sender curve.
3.4 Oil Pressure Switch Message
The EMS-3 can also be used to display a warning message from a switch type oil pressure sender. These senders can be
of a NO (Normally Open) or a NC (Normally Closed) type sender.
The oil pressure switch uses the analog 4 input
channel.
This message is displayed when there is an oil pressure alarm from the switch (NO/NC)
on the oil pressure sender.
