TSLM - M601 Operational & Install Manual
Torque and Oil Pressure Sensing (optional)
The circuit below shows how the TSLM is able to measure engine torque and oil-pressure via
separate 4-20mA pressure transducers. They are optional since the TSLM can fulfill all its primary
functions (engine start control and limiting) without needing to sense torque or oil-pressure.
They must however be installed if you want these measurements to show on your VRX multi-
function display(s), should you have this in your system. If torque rises above its limit an
exceedence graph will be triggered where all parameters are recorded while the exceedence last.
Please note that these transducers are a different set from the ones used by other companies like
Electronics International (EI). They can be incorporated with similar sensors (for other
instrumentation) by T-pieces. They will thus provide transducer and measurement redundancy.
Figure 17 - Torque & Oil Pressure Sense Wiring
We use 4-20mA transducers that reduce the wire count and are less susceptible to noise (EMI).
They are available commercially of the shelf from various vendors and their minimum requirement
are as follows:
Sensor output type 4-20mA (two wires)
Measurement media Gas, Fluid (oil)
Pressure type Gage or sealed gage
Pressure range for oil-pressure sensor 0 – 50 psi
Pressure range for torque sensor 0 – 200 psi, or 0 – 250 psi
The Torque 200psi enable setting must reflect your choice
Operating temperature range -40 to +125°C
Maximum operating voltage 30V
Examples of sensors that you can use are:
Measurement Part Number Pressure Port Electrical termination
Oil-pressure M5151-000005-050PG ¼ – 18 NPT Cable (2 feet)
Torque M5151-000005-250PG ¼ – 18 NPT Cable (2 feet)
06/29/16 © 2016 VR Avionics page 23 of 33
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