u-Monitor Documentation
The Micro-Monitor is a kit built engine monitor system provided by Rocky Mountain Instruments. Wiring of the u-Monitor is described in Wiring Diagram #4. The u-Monitor provides the following functions:
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range |
alarm |
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Oil Pressure |
0/99 psi |
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Fuel Pressure |
0/99 psi |
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Manifold Pressure |
10.0/59.0 InHg |
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Oil Temperature |
-40/390 ºF (-40/199 ºC) |
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Cylinder Temperature |
32/700 ºF (0/370 ºC) |
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Exhaust Gas Temperature |
32/1652 ºF (0/900 ºC) |
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Carburetor Temperature |
-10/200 ºF (-23/93 ºC) |
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Ammeter |
-9/99 amps |
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Voltmeter |
0/39.9 volts |
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Outside Air Temperature |
-40/390 ºF (-40/198 ºC) |
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Tachometer |
60/8000 rpm |
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Percent Power |
0/99 % |
None |
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Fuel Flow |
.6/60 gph (.2/99.9 lph) |
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Fuel Quantity |
0/99.9 gal - 0/999 liters |
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Endurance |
0/99.9 hrs |
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GMT |
0/2359.9 |
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LMT |
0/2359.9 |
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Up/down Timer |
0/59.9 min |
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Flight Time |
0/6553.5 hr |
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Tach Time |
0/6553.5 hr |
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User Alarm #1 |
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On Switch Close |
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User Alarm #2 |
|
On Switch Close |
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User Alarm #3 |
|
On Switch Close |
1. Three functions are not displayed continuously: volts, outside air temperature and endurance. These functions are displayed only while one of the buttons is pressed.
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6.25in Wx3.25in Hx4.5in D (15.9x8.3x11.4 cm) fits standard radio stack |
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Weight |
1.5 pounds (.68 kg) without senders |
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Temperature |
-15 to +50°C operating |
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Altitude |
0 to 30,000 feet operating |
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Display |
Custom liquid crystal display |
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Backlight |
LED/Fiber-optic with manual dimming |
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Power |
12 to 31 volts DC @2 watts |
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Clock |
Power drain 150ma |
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Audio |
200mw into 600 ohm load |
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Cooling |
Not required |
All components are guaranteed for a period of two years from the date of first flight against defects in materials and workmanship.
The microMONITOR is designed to replace all traditional engine instrumentation in aircraft, resulting in a cost-effective method of saving panel space and weight.
The microMONITOR has 23 different functions including percent power, manifold pressure, tachometer, exhaust gas temperature, cylinder head temperature, oil temperature, carburetor temperature, ammeter, voltmeter, oil pressure, fuel pressure and outside air temperature. An integral turbine-sensor fuel totalizer provides fuel flow, fuel quantity remaining and time to dry tanks.
Using a powerful microprocessor, the unit continuously displays the engine parameters on a custom designed display while at the same time providing advanced computer monitoring of the engine.
The measurements of all critical functions are compared to alarm set points that are adjustable by the user using the front panel controls. Any out-of-limit measurement activates an audio alarm, and the errant reading blinks on the display.
The compact microMonitor also includes a five-function clock with GMT, LMT, timer with two modes and an engine hour meter with reset and accumulative tach time.
Ø Temperatures in degrees Fahrenheit or Celsius and fuel in gallons or liters.
Ø Adjustable high/low alarm limits.
Ø Adjustable cruise RPM for tachometer hours.
Ø Magneto, electronic ignition or magnetic pickup for RPM sensing.
Ø Pre-program your aircraft full fuel capacity for easy fuel totalizer reset.
Ø Blank any function that is not being used.
Ø Adaptable to water cooled and rotary-vane engines.
Ø Add external switch to measure up to six cylinders of CHT and EGT.
Ø Front panel controls allow easy adjustment of alarm set points.
Ø Three uncommitted alarms for sensing external switch position allow user-defined alarms for gear, canopy, etc.
Ø Two audio alarms - 600 ohm for headset and external audio transducer.
Ø Fuel data output for GPS units.
Ø Full fuel-airdata output for GPS units if RMI’s microEncoder is installed.
Ø Download stored log memory engine data to a PC or laptop for analysis.
Ø Upload free software upgrades using a PC or laptop.
Ø Fuel remaining based on actual used.
Ø Engine fuel flow in gallons per hour.
Ø Endurance based on current fuel flow and fuel remaining.
Ø Front panel calibration based on actual flight history.
Ø Up to 165 hours of engine data stored on user specified intervals with time/date stamp.
Ø Custom high-stability aerospace quality liquid crystal display.
Ø Aviation green LED driven fiber-optic backlight with front panel dimming.
Ø Simple calibration using front panel controls.
Ø Adjustable headset audio volume.
Ø Battery-charging circuitry for optional external battery allows five to ten hours of stand-alone operation.
Ø Negligible drain on aircraft battery to maintain clock during long shutdowns.
Ø Battery-less non-volatile memory retains important settings and totals with power off or disconnected.
