MGL Avionics Stratomaster Ultra L - Page 54

MGL Avionics Stratomaster Ultra “L” Owner’s manual
Page 54
The characteristics of J and K types are very different so it is important that you select the
correct thermocouple type.
All thermocouples supplied by MGL Avionics are type K.
The top four entries can only assume either J or K type thermocouples. These are equivalent
of RDAC thermocouple input channels 1,2,3 and 4.
The next two channels may be set to N Type, M type or MGL precision. N types are only
used with Rotax 912/914 CHT. These senders are fitted to the 912 engine as standard. The
M type refers to a sender available from MGL Avionics for special applications. For a
description of the MGL precision sender see below.
The H2O entry selects which probe you have connected as water temperature probe.
You can select the M type probe (MGL supplied NTC probe) or the MGL precision
temperature probe (see below).
The OILT entry selects which probe you have connected as oil temperature probe.
You can select the N type probe (Rotax type oil temperature probe as fitted to the 912/914) or
the MGL precision temperature probe (see below).
Oil pressure resistance refers to the resistance the oil pressure sender will exhibit at
maximum pressure of 10 bars (145 PSI). 200 ohms is the reading for the oil pressure sender
fitted as standard to Rotax 912 and 914 engines. You can adjust the setting over a wide
range to allow use of the instrument with a large variety of oil pressure senders. Oil pressure
senders supported must increase resistance fairly linearly with pressure. This is the case with
most standard automotive senders.
Most available automotive senders will be in the range of 100 to 400 ohms. We recommend
the oil pressure senders available from VDO.
The MGL precision temperature probe
MGL Avionics manufactures a precision temperature probe based on an accurate and well
proven semiconductor chip. This sender is more expensive compared to the ordinary
automotive senders used in standard applications but offers outstanding accuracy and as
additional advantage is completely electrically isolated from the engine it is fitted to. This is an
advantage in some installations as the temperature reading is not influenced by electrical
currents flowing in the engine. This sender can be used to measure temperatures from zero
degrees Celsius to about 180 degrees Celcius. The sender is suitable for water or oil
temperature measurements to an accuracy of +/-1 degree over the full temperature range.