Garmin RS-232 User Manual

™

Microflo-L

Digital Fuel

Management System

with interface to LORAN-C and GPS receivers with

RS-232 output format

OPERATING MANUAL

Single and Twin Engine Indicators

For P/N: 91204XT-38-D

Shadin

TABLE OF CONTENTS

1. GENERAL DESCRIPTION..........................................................................3

1.1 THE SYSTEM PROVIDES.........................................................................4

1.1.1 SPECIFIC RANGE............................................................................4

1.1.2 FUEL TO DESTINATION................................................................4

1.1.3 FUEL RESERVE...............................................................................4

1.1.4 ENDURANCE...................................................................................4

1.1.5 FUEL FLOW.....................................................................................5

1.1.6 FUEL USED......................................................................................5

1.1.7 FUEL REMAINING..........................................................................5

1.2 SYSTEM COMPONENTS...........................................................................6

1.2.1 FUEL FLOW TRANSDUCER..........................................................6

1.2.2 LORAN-C OR GPS RECEIVER.......................................................6

1.2.3 PANEL MOUNTED UNIT...............................................................6

1.3 TEST FUNCTION........................................................................................7

2. PREFLIGHT PROCEDURES.......................................................................8

2.1 INITIAL PROGRAMMING.......................................................................8

2.2 PREFLIGHT CHECK .................................................................................9

2.3 NO FUEL ADDED......................................................................................10

2.4 FUEL TANKS FULL .................................................................................10

2.5 PARTIAL FUEL ADDED..........................................................................11

2.6 CORRECTING FUEL ON BOARD ENTRY ERROR...........................11

3. INFLIGHT OPERATIONS.........................................................................12

3.1 INSTRUMENT OPERATION..................................................................12

3.1.1 FUEL FLOW...................................................................................12

3.1.2 FUEL USED....................................................................................12

3.1.3 FUEL REMAINING........................................................................12

3.1.4 ENDURANCE.................................................................................12

3.1.5 NAUTICAL MILES PER GALLON...............................................13

3.1.6 FUEL TO DESTINATION..............................................................13

3.1.7 FUEL AT DESTINATION..............................................................13

1

NOT ENOUGH FUEL.....................................................................14

3.2.1

3.2.2 RESERVE FUEL WILL BE USED.................................................14

3.2.3 LOW ENDURANCE.......................................................................14

3.2.4 LOW FUEL REMAINING..............................................................14

3.3 BRIGHTNESS CONTROL.......................................................................15

4. EMERGENCY PROCEDURES..................................................................15

5. ERROR MESSAGES...................................................................................16

6. CONFIGURATION DATA ENTRY...........................................................17

7. SPECIFICATIONS.......................................................................................24

8. WARRANTY INFORMATION..................................................................26

6831 Oxford Street

St. Louis Park, MN 55426

U.S.A.

Sales: (800)-328-0584

Technical Support: (800)-388-2849

WWW.SHADIN.COM

NOTE: Though references are made in this manual to fuel measured
in gallons, the information applies equally to measurements in
pounds, kilos, or liters.

2

Microflo-L

Although not required by the FAA, it is recommended that this
manual be attached to the FAA-approved Flight Manual, or always
kept on board for reference.

™

1. GENERAL DESCRIPTION

Microflo-L™ is a Digital Fuel Management System designed to
provide complete fuel management information under real flight
conditions without any manual entry of data (after entry of the
initial fuel on board information).

Microflo-L™ is connected to the engine fuel flow transducer for
fuel flow information and to the Loran-C or GPS receiver serial port
for navigation data (ground speed, distance and estimated time en
route).

This system is also capable of transmitting the fuel information to
the Bendix/King KLN-88, KLN-90, and Garmin GPS navigation
receivers, except the Garmin 100, for additional calculations and
display of fuel management data.

Microflo-L™ is set up to measure the flow of fuel in either gallons,
liters, pounds, or kilos, and it can be installed on virtually any
reciprocating or turbine engine by selecting the proper size fuel
flow transducer.

3

1.1 THE SYSTEM PROVIDES

1.1.1 SPECIFIC RANGE
Specific Range (NM/GAL) = Ground Speed (Kt.)/Fuel Flow
per hour. This is an indication of how efficient the cruise is
and the optimum cruise speed can be determined by
selecting the power setting, which yields the highest nautical
miles per gallon.

1.1.2 FUEL TO DESTINATION
Microflo-L™ calculates (under real wind conditions) the
fuel necessary to reach the destination as selected on the
Loran-C or GPS receiver by multiplying the fuel flow by the
estimated time en route to the destination. (If an
intermediate waypoint is selected for navigation purposes,
the displayed fuel to destination represents the fuel needed
to reach the intermediate waypoint unless the distance to the
destination is in the serial message.)

1.1.3 FUEL RESERVE
Microflo-L™ calculates the amount of fuel which will be
available on board when the aircraft reaches the destination
or waypoint indicated on the Loran-C or GPS receiver. This
feature provides the pilot with accurate information so that
the reserve fuel situation can be evaluated and action can be
taken if necessary. (If an intermediate waypoint is selected
for navigation purposes, the displayed fuel reserve
represents the fuel reserve at the intermediate waypoint
unless the distance to the destination is in the serial
message.) Fuel Reserve = Fuel Remaining – Fuel to Reach
Destination.

1.1.4 ENDURANCE
Microflo-L™ calculates the time left to fly in hours and
minutes based on the fuel remaining and the present fuel
flow.

4

1.1.5 FUEL FLOW
The system provides a digital readout of the fuel per hour to
a tenth of a gallon up to 100 gallons and to the nearest
gallon above 100 gallons. For the pounds version, the
readout is to the nearest pound up to 999 lbs./hour and to the
nearest 10 lbs. above 999 lbs./hour.

1.1.6 FUEL USED
The system keeps track of the fuel used since the last fuel
entry or reset.

1.1.7 FUEL REMAINING
The system keeps track of the fuel remaining on board. Fuel
Remaining is equal to Initial Starting Fuel minus Fuel Used.

5

1.2 SYSTEM COMPONENTS

The system consists of three (3) basic units: the fuel flow
transducer, the navigation receiver (Loran-C or GPS) and the panel
mounted unit.

1.2.1 FUEL FLOW TRANSDUCER
The fuel flow transducer mounted in the fuel line measures
the flow of fuel and generates electrical pulses directly
proportional to the fuel flow. The transducer is fail-safe
designed, and stopped rotor will not interrupt fuel flow to
the engine.

1.2.2 LORAN-C OR GPS RECEIVER
The Loran-C or GPS receiver provides ground speed,
distance, and estimated time en route through the serial port.

1.2.3 PANEL MOUNTED UNIT
All system electronics, function controls and digital displays
are contained in a single instrument that mounts in a
standard 2¼” hole. This unit requires no periodic
maintenance, adjustment, or calibration once it is properly
installed.

The Display: The fuel flow is always displayed on the left side of
the display window. All other functions, with the priority for the
rotary switch functions, are displayed on the right side of the
display window.

System Memory: The system includes a non-volatile memory that
retains fuel remaining and fuel used information when the power to
the unit is shut down.

6

1.3 TEST FUNCTION

Diagnostic software is built into the system. To activate it, press
the ENTER/TEST button until all of the display digits fill with a
checkerboard pattern, and then release it. This display will flash on
and off three (3) times. Next, all digits will be filled with a second
checkerboard pattern, the inverse of the first, which will also flash
on and off three (3) times. Careful monitoring of these patterns will
verify operation of every element of the display unit.

If the test is successful, the word “GOOD” will appear in the
display window for three seconds. (If the test is not successful, the
word “BAD” and an error message identifying the error will be
displayed. In such case, the unit will cease to function and must be
considered unserviceable until corrective action is taken.) This is
followed by:

1) The K-factor setting (Pulses Per Gallon) and units of measure

the system is set to (gallons, liters, pounds or kilograms).

2) LT ( ): Loran or GPS Type (without signal, will display ‘LOF’)

3) The distance to waypoint or destination as shown on the Loran-

C or GPS receiver to check the data interface integrity. (not
available without signal)

4) Maximum usable fuel setting.

5) Software version.

6) If the system is not capable of reading the navigation receiver

data, the word “LBD” will appear in the display window.

NOTE: a) Using the test function while the engine is running will

cause the computer to lose 17 seconds of fuel count.

7

2. PREFLIGHT PROCEDURES

MICROFLO-L is a fuel flow measuring system and NOT a
quantity-sensing device. A visual inspection and positive
determination of the usable fuel in the fuel tanks is a necessity.
Therefore, it is imperative that the determined available usable fuel
be manually entered into the system.

2.1. INITIAL PROGRAMMING

The function of initial programming is to enter the total usable fuel
into the memory. It can then be recalled whenever the fuel tanks
are filled up to the maximum usable fuel. The “Full” fuel setting
determines the maximum amount of fuel that can be entered by any
method into the Microflo-L.

PROCEDURE:

1. Power the unit up.

2. Move the ADD/FULL toggle switch to the FULL position and

hold for the entire procedure.

3. Simultaneously press the ENTER/TEST button and move the

USED/REM toggle switch to the REM position. The system
will then count down for 15 seconds, displaying the count on
the left in the display window.

4. The word “FUL” and the current full fuel value will appear in

the display window. Release the ENTER/TEST button and
USED/REM toggle switch. Keep holding the ADD/FULL
toggle switch in the FULL position.

5. Move the USED/REM toggle switch to the REM position to

increment the full fuel number or to the USED position to
decrement the number. (The longer you hold the switch in
position, the faster the number will be updated.)

8

6. After reaching the correct total usable fuel figure, press the

ENTER/TEST button and the computer will store that number
as full fuel. The word “FUL” disappears and the computer will
return to the operating mode. Release the ADD/FULL toggle
switch.

7. To verify that the data is stored properly, press the

ENTER/TEST button. The computer will run a diagnostic
check and then display “GOOD”. If the test is successful, it will
display the maximum usable fuel.

NOTE: Do not turn the power off to the computer for
approximately one minute. This will ensure that the unit
has enough time to store the proper figures into the
program.

2.2 PREFLIGHT CHECK

Initiate the diagnostic software built in to the system by pressing the
ENTER/TEST button; the program checks the hardware and the
display. If the test is successful the word “GOOD” will appear in
the display window; if not, the word “BAD” appears. The system is
considered unserviceable until corrective action is taken.

At the end of the test routine the system will display the following:

1. Software version

2. The K-factor setting (pulse count/gallon)

3. The display units (Gal., LB 5.8, LB 6.7, etc.) as part of checking

the internal settings.

Move the USED/REM toggle switch to the USED position. The
system will display the fuel used since last fuel entry or fuel used
since last reset.

9

Move the USED/REM toggle switch to the REM position. The
system will display the fuel remaining on board. The pilot should
confirm this figure with the actual fuel on board.

2.3 NO FUEL ADDED

This automatically stores information concerning previous fuel
levels, even in the case of a power down. If no fuel is added, no
action is needed in updating fuel data.

2.4 FUEL TANKS FULL

There are two methods to enter full fuel: the ramping method and
the ADD/FULL toggle switch method.

Ramping Method

• Move the USED/REM toggle switch to the REM position and

hold.

• Press the ENTER/TEST button to increment the fuel remaining

until the total usable fuel is reached. (The longer you press, the
faster the incrementing.)

• Release the USED/REM toggle switch and the ENTER/TEST

button to enter the total usable fuel on board into memory.

• If the required figure is exceeded, follow the procedure in this

manual, section 2.6 Correcting Fuel on Board Entry Error.

ADD/FULL Toggle Switch Method

• Move the ADD/FULL toggle switch to the FULL position and

hold.

• Press the ENTER/TEST button.

• Release the ADD/FULL toggle switch so it returns to the center

position.

• To verify, move the USED/REM toggle switch to the REM

position. Total usable fuel will be displayed.

10

2.5 PARTIAL FUEL ADDED

There are two methods to enter partial fuel:

Ramping Method

Add the amount of fuel from the refueling meter to the amount of
fuel remaining. Enter the total using the following steps:

1. Move USED/REM toggle switch to REM position and hold.

2. Press and hold ENTER/TEST button to increment fuel

remaining until figure to be entered is reached; then release
button.

3. Release the USED/REM toggle switch. The displayed figure is

entered into memory as fuel remaining on board.

4. If the required figure is exceeded, follow the procedure in this

manual, section 2.6 Correcting Fuel on Board Entry Error.

ADD/FULL Toggle Switch Method

1. Move ADD/FULL toggle switch to ADD position and hold.

2. Move USED/REM toggle switch to REM position to increment

fuel added figure until amount of fuel added is reached.

3. Press the ENTER/TEST button.

4. Release the ADD/FULL toggle switch so it returns to the center

position. The computer will add the added fuel remaining and
use the total as the current fuel remaining.

5. To verify, move the USED/REM toggle switch to the REM

position. The current usable fuel remaining will be displayed.

2.6 CORRECTING FUEL ON BOARD ENTRY ERROR

In case an error has been made by exceeding the correct amount in
entering the total usable fuel, move the USED/REM toggle switch
to the USED position and simultaneously press and hold
ENTER/TEST button. The fuel remaining figure will appear and
pause in the display window for four (4) seconds. The figure will
decrement (the longer you press, the faster it decrements). When
the correct figure is reached, release both the USED/REM toggle
switch and the ENTER/TEST button. To avoid repeating the four­second pause before decrementing, hold the USED/REM toggle

11

switch in the USED position and use the ENTER/TEST button to
control the decrementing.

Note: Adding or subtracting fuel by any method resets the fuel used
value to zero.

3. INFLIGHT OPERATIONS

3.1 INSTRUMENT OPERATION

3.1.1 FUEL FLOW
For Single Engine Aircraft: FUEL FLOW is displayed
continuously on the left display window.

3.1.2 FUEL USED

3.1.3 FUEL REMAINING

3.1.4 ENDURANCE

For Twin Engine Aircraft: Total fuel flow is displayed
continuously on the left side of the display window. To read
each engine’s fuel flow individually, press the “REM” and
“DIM” switches simultaneously.

Fuel used is displayed by moving the USED/REM toggle
switch to the USED position. The information is shown on
the right display window as long as the switch is held in the
USED position and for three seconds after the switch is
released. The display represents the fuel used since last
reset.

Fuel remaining is displayed by moving the USED/REM
toggle switch to the REM position. The information is
shown on the right display window as long as the switch is
held in the REM position and for three seconds after the
switch is released. The display represents the fuel
remaining on board at the time of reading.

Endurance is selected by rotating the rotary switch to the
ENDURANCE position. Endurance is displayed in hours
and minutes on the right display window.

12

3.1.5 NAUTICAL MILES PER GALLON
Nautical miles per gallon is selected by rotating the rotary
switch to the NM/GAL position. The information is shown
on the right display window.

3.1.6 FUEL TO DESTINATION
Fuel to destination is selected by rotating the rotary switch
to the FUEL TO DEST. position. The information is shown
on the right display window and represents the fuel needed
to reach either the active waypoint selected on the Loran-C
(or GPS receiver) or the final destination (if the total
distance record is provided in the serial message.) This
assumes the aircraft ground speed and fuel flow remains
constant and the aircraft remains on flight plan course.
(Readings obtained during climb and descent are invalid.)

3.1.7 FUEL AT DESTINATION
Fuel reserve is selected by rotating the rotary switch to the
F. AT DEST position. The information is shown on the
right display window and represents the fuel that will be
available when the aircraft reaches its destination as
indicated on either the selected waypoint or the final
destination (if the total distance record is provided in the
serial message.) This assumes the aircraft ground speed,
altitude, fuel flow, and direction remain constant. (Readings
obtained during climb and descent are invalid.)

13

3.2 WARNINGS

3.2.1 NOT ENOUGH FUEL
When the rotary switch is in FUEL TO DEST. position, the
information in the display window flashes if fuel on board is
insufficient to reach either the destination selected as the
active waypoint or the final destination (if that total distance
record is provided in the serial message). Display window
shows amount of fuel short to reach destination preceded by
a negative sign.

3.2.2 RESERVE FUEL WILL BE USED
With the rotary switch is in F. AT DEST. position, the
information in the display window flashes if the aircraft will
arrive at the destination with less than the pre-programmed
Endurance Warning Time minutes of fuel - calculated at the
present cruise power setting. This warning is intended to
alert the pilot that the prevailing condition will require the
use of some of the selected reserve fuel to reach the
destination.

3.2.3 LOW ENDURANCE
The Microflo-L can be configured to display a warning
based on the time remaining to fly. When the rotary switch
is in the ENDURANCE position, and the actual endurance
is less than the pre-programmed Endurance Warning Time,
the data in the right half of the display flashes. Press the
TEST/ENTER button to acknowledge the warning. (Note:
Resetting the Microflo-L or adding fuel resets this condition
and the warning is enabled again).

3.2.4 LOW FUEL REMAINING
The system displays “Lo FUEL” when the fuel remaining
reaches the pre-programmed Low Fuel Level configured in
setup. Fuel flow information will not be displayed again
until the pilot acknowledges this word by pressing the
ENTER/TEST button. Fuel calculations are not interrupted
by this message. (Note: Resetting the Microflo-L or adding
fuel resets this condition and the warning is enabled again).

14

3.3 BRIGHTNESS CONTROL

The display brightness is controlled by the BRIGHT/DIM toggle
switch. Moving the BRIGHT/DIM toggle switch to BRIGHT
repeatedly will make the display brighter; moving it to DIM
repeatedly will dim the display. The default brightness after power
up is full brightness.

4. EMERGENCY PROCEDURES

In case of electrical power failure in-flight, the instrument will
cease to function. After restoring power, the system will resume
accurate fuel flow reading, but time remaining, fuel used, fuel
remaining, fuel reserve, fuel to destination, and all warnings will
not be accurate unless the duration of power failure is known, and
fuel consumption during the electric power failure is calculated, and
subtracted from fuel remaining.

15

5. ERROR MESSAGES

ERROR 1:

Dues to the necessity of Group 1 settings, if the Flow Meter is set to
Operate Mode and the checksum of Group 1 is bad, the display will
flash: E1.

This refers to Error 1, Group 1. The flow meter will not continue to
function after this point, and will continue flashing E1, alerting the
flow meter must be serviced.

ERROR 2:

The Flow Meter will still be accurate and operate under NON­LORAN pages if the checksum of Group 2 is bad. In this case,
under any Loran page, the Loran information will be replaced by
E2.

This display refers to Error 2, or Group 2. This is to alert the pilot
that the Flow Meter does not have valid Loran and Output
selections, and therefore, can not rely on Loran and Output
information.

NOTE: Remember it is possible to set group settings without
having to be in entry mode, therefore, this error can be fixed by
going into Manual Entry Mode.

16

6. CONFIGURATION DATA ENTRY

Manual Entry Mode

Ordinarily, the fuel flow indicator has been set up by the factory to
match the K-factor of the supplied transducers and other set-up
information. However, there are built-in provisions to change the
set-up. Please be sure to define and document initial set-up before
attempting to make changes.

Overview

Previously, all settings depended upon the switches mounted on the
processor board. Currently, the Microflo-L™ processor board and
software version 60.08.XX has a feature that is referred to as
Manual Entry Mode. In this mode, the Flow Meter settings are
stored as two groups: Group 1 and Group 2, both shown in the table
below.

Group 1 Group 2
Left & Right K Factors Output Type (King, AirData, Arnav)
Fuel Units Loran Input (On, or Off)
Single or Twin Engine Type Endurance Warning Time (45, 30,

20, 10, or 5 minutes)
Low Flow Cutoff (On or
Off)*
Left & Right Fuel Flow
Offset Frequency*
Ignore Loran Warning (Yes or No)

*These functions are only applicable to DC systems.

Manual Entry Mode can be accessed in two ways: one providing
access to both Group 1 and Group 2 values, and one providing
access to only Group 2 values. The access to Group 2 values can be
obtained while the unit is installed in the aircraft. Access to Group
1, however, requires removal of the unit to adjust switch settings.

Filter Type (Injector or Carburetor)

Low Fuel Level Warning (fuel level

for warning to be issued)

17

Group 1: Generally, Group 1 is set up by the distributor and
contains information defined by the part number. However,
although functions are defined here, do not change them without
proper knowledge or they will affect performance of the indicator.

Group 2: Group 2 must be set up by programming the unit in
Manual Entry Mode. Group 2 settings allow the user or installer to

change Loran or GPS input and output parameters, endurance
warning time, and fuel flow filtering types.

18

Locations of the switches for the Microflo are as follows:

F
A
C

Component side of board

E
P
L
A

SW4 SW3 SW2 SW1

Board Edge

T
E

Each switch has 16 positions, 0-9, A, B, C, D, E, F.

Operation Mode vs. Entry Mode

FE: If Switch 1 is set to F and Switch 2 is set to E, the unit is in

Entry Mode. This is the only mode that will allow the
setting of Group 1 values onto the non-volatile memory of
the unit. In this mode, both groups can be set. Once
installed in the aircraft, this mode is no longer accessible.

FF: Once the settings have been programmed, Switches 1 and 2

should be set to FF. This is the Operation Mode, which is
required for normal operations. In this mode, settings
previously recorded for Groups 1 and 2 will be utilized, and
not the switches. Group 2 can still be accessed through the
Manual Entry Mode, but Group 1 is not accessible.

Switch Entry Mode Operation Mode
1 F F
2 E F
3 0 0
4 0 0

19

Manual Entry Mode

There are two ways to access the Manual Entry Page.

1. Set Switches 1 and 2 to Entry Mode and power up. This allows

access to both groups.

2. If the Switches are not set to Entry Mode, while running under

normal conditions, press the TEST/ENTER button to start the
test mode. When the version is displayed, press and hold the
TEST/ENTER button for 15 seconds. This allows access to
Group 2 only.

In both instances, “ENT” will be displayed. When “ENT” appears
release button. The display can now be paged through using the fuel
“USED” button to scroll forward or the fuel REM button to scroll
back.

USED

USED

REM

REM

S

S

*L

*L

*E

*E

*R

*R

*U

*U

*B(b)

*B(b)

u

u

W( )

W( )

F

F

D(d)

D(d)

VALU ES

VALU ES

DISPLAYED

DISPLAYED

I

I

O

O

*C

*C

Note: See page 23 for description of parameters.

20

*A

*A

The values displayed can be adjusted with the ADD/FULL toggle
switch. ADD increments the value, and FULL decrements the
value. As you hold ADD or FULL, the scrolling rate will increase
up to a maximum speed.

If you wish to jump directly into the fastest scrolling speed, while
holding the ADD/FULL toggle switch, press the fuel USED or fuel
REM button.

Once the desired values are selected, press and hold the
TEST/ENTER button while the upper window displays a count
down from 5 to 1. When the lower left window displays “SET,”
release the TEST/ENTER button.

Note: It is recommended that you leave the unit powered up for at
least one minute before turning the unit off. Reset switches 1 and 2
to Operate Mode (F,F) and reboot (Power ON). Then confirm the
settings. The Manual Entry Pages will be displayed as follows.
Symbols in ( ) represent 7 segment characters actually displayed.

Field K-factor adjust for Software Versions 60.08.72+

1. Remove the Microflo-L from the instrument panel.

2. Remove the red label from the right side of the Microflo-L

and save it to be put back in place after the adjustment is
complete.

3. With a small, flat blade screwdriver change the second

hexadecimal switch (SW2) from the face of the Microflo-L
from position “F” to position “E”.

4. Reconnect the unit to the aircraft harness and turn the

aircraft master switch on. An “L” for the left engine will
appear on the left side of the left window, and the K-factor
minus the least significant digit on the right side of the
window.

21

5. The K-factor values displayed can be adjusted with the

ADD/FULL toggle switch located at the lower right corner.
ADD increments the value, and FULL decrements the value.

6. Move the REM/USED switch at the upper right corner to

the USED position to move to page “r” for the right engine
in twin engine aircraft and repeat Step 5.

7. Press and hold the ENTER/TEST button (at the six-O-clock)

position for a five seconds countdown that will appear on
the display. When the word “SET” appears, release the
button and wait 30 seconds before turning the aircraft master
switch off.

8. Change the SW2 (hexadecimal switch) back to the “F”

position. Put the red label back on the can as it was before
the K-factor adjustment.

9. Turn the aircraft master switch on again to test the system

for changes made. When the fuel flow settles down to zero,
press and hold the ENTER/TEST button until the screen
starts to flash and then release the button. The first screen
after the “Good” will display the K-factor for the left engine
in the left side of the screen with the right side of the screen
showing the units of measure (i.e. gallons, pounds, etc). The
next screen will be blank on the left side and the right side
will display the K-factor for the right engine (if applicable).
If the correct K-factor(s) is/are displayed, the procedure was
successful.

22

Display Description

*L xxxxx = Left K-factor (where xxxxx is valid from 0 to 20,000. These are in 10s. A

*R xxxxx = Right K-factor (as above).
*A xxxxx = Left Fuel Flow Offset Fr equency (Hz) for Analog Models Only
*B(b) xxxxx = Right Fuel Flow Offset Frequency (Hz) for Analog Models Only
*U x = Fuel Units are defined by the part number. Do not adjust these, as improper

*E x = Engine Type:

*C x = Low Flow Cutoff:

O x = GPS/Output Type: Only used with Microflo-L, which selects the serial data

setting of 1234 would be a K-factor of 12,340)

burn indication will occur.
0 = Gallons
1 = Liters
2 = Lbs 5.8
3 = Lbs 6.7
4 = Kilograms
5 = Lbs 6.5
6 = Lbs 6.35

0 = Single
1 = Twin

0 = Off
1 = On
NOTE: Will not display fuel flow until a rate of 50 pounds per hour is
reached.

output type by GPS or Loran Manufacturer.
0 = none
1 = Allied Signal, KLN series
2 = AirData, used to communicate with a Shadin Airdata
computer
3 = Arnav, used to communicate with most Arnav Loran or GPS
4 = Trimble, used to communicate with most Trimble Loran
or GPS
5 = Generic, used to communicate with most Garmin GPS

I X = Loran Input:

D(d) x = Endurance Warning Time:

F x = Filter Type:

u

) x = Ignore Loran Warnings

W(

S xxxx = Low Fuel Level: Displayed in same units of measure as the flow rate.

* = Group 1 information ( ) = actual letter display. All others displayed as shown

0 = Off
1 = On

0 = 45 minutes
1 = 5 minutes
2 = 10 minutes
3 = 20 minutes
4 = 30 minutes

0 = Injector
1 = Carburetor, for engines equipped with a carburetor

0 = No (default) setting used with Shadin Flow Meter. With
GPS, set to zero (0).
1 = Ignore Loran Warnings. Used with Foster Loran only.

23

7. SPECIFICATIONS

Certification: TSO-C44a
Maximum usable fuel: 1,800 gallons
6,822 liters
9,999 lbs
5,484 Kg @ 0.805 Kg/lit
Maximum Altitude: 40,000 ft
Operating temperature: -30° to 50°C
Humidity: Up to 95% @ 32°C
Accuracy:
Ground Speed Range: 27-600 knots
Functions: Fuel Flow (selectable endurance warning)
Fuel Used
Fuel Remaining
Full Fuel
Add Fuel
Endurance
NM/gallon
Fuel to Destination
Fuel at Destination

ELECTRICAL RATING

± 2%

Input Voltage: 14 – 28 VDC
Input Current: 150mA @ 14 VDC to 28 VDC

ELECTRICAL INTERFACE

RS-232, Serial Data

MECHANICAL RATING

Weight: Panel unit: 8 oz.
Dimensions: 2 ¼” x 4 ¼”
Mounting: Instrument Panel

24

COMPATIBLE RECEIVERS:

ARNAV R15, R20, R21, R30, R40, R50, R50V, R50i, R5000,

FMS5000, Star5000, FMS7000

BENDIX/KING KLN-35, KLN-89B, KLN-90, KLN-90A,

KLN-90B, KLN-94, KLX-135, KLN- 900

BFGOODRICH/
FOSTER

GARMIN 100, 150, 150XL, 155, 155XL, 165, 250, 250XL, 300, 300XL

MAGELLAN 5000

NORTHSTAR M1 (above S/N 14800), M1A, M2, M3, 60, 600

SKYFORCE (*AIM) KMD-150, Skymap II, Skymap IIIC

TRIMBLE 1000DC, 2000, 3000, 2100, 3100

IIMorrow/
UPS Aviation
Technologies/
Garmin AT

Microflo-L supports the interface for NMEA 0183 version 2 Input Protocol.
This Protocol is available from most Handheld GPS Receivers. No output
communication from the Microflo-L to the Handheld GPS Receivers is
supported in this configuration.

PIN ASSIGNMENTS:

PIN Microflo-L

1 +14VDC or +28VDC (2A Circuit breaker)
2 Airframe Ground
3 Left/Single Fuel Flow Transducer Power

(+12VDC to Transducer)

4 Right Fuel Flow Transducer Power

(+12VDC to Transducer)
5 Ground to Left/Right Fuel Flow Transducer Black Wire PIN C
6 TX RS-232 (to LORAN or GPS)
7 Left/Single Fuel Flow Transducer Signal White Wire PIN B
8 Right Fuel Flow Transducer Signal White Wire PIN B
9 RX RS-232 (from LORAN or GPS)

F4, F14, 500, 501, 616, LNS-6000

GPS 400/500, GNC 420/520, GNS 430/530

*Avionics Installation Module

Apollo 612B, 618, 618TCA, 820
GX-50/55/60/65, 360, CNX80
NMS 2001, NMC 2001

TRANSDUCER

P/N 91204XT-38-D

68050X

Red Wire
(+12VDC input)
Red Wire
(+12VDC input)

TRANSDUCER

PIN A
(+12VDC input)
PIN A
(+12VDC input)

6605XX

25

8. WARRANTY INFORMATION

6831 Oxford Street

St. Louis Park, MN 55426

Limited Warranty

Shadin warrants this instrument and system components to be free
from defects in materials and workmanship for a period of one year
from the user invoice date. Shadin will repair or replace any item
under the terms of this Warranty, provided the item is returned to
the factory prepaid.

This obligation assumed by Shadin under this Warranty is limited to
repair, replacement or refund of the product at the sole discretion of
Shadin.

This Warranty shall not apply to any product that has been repaired
or altered by any person other than Shadin or that has been
subjected to misuse, accident, incorrect wiring, negligence,
improper or unprofessional assembly or improper installation by
any person. This Warranty does not cover any reimbursement for
any person’s time for installation, removal, assembly or repair.
Shadin retains the right to determine the reason or cause for
warranty repair or replacement.

This Warranty does not extend to any aircraft, vehicle, boat,
machine or any other device to which this Shadin product may be
installed, connected, attached, interconnected or used in conjunction
with in any way.

Shadin is not responsible for any shipping charges or damages
incurred under this Warranty.

26

No representative is authorized to assume any other liability for
Shadin in connection with the sale or resale of Shadin’s products.

If you do not agree and accept the terms of this Warranty, you
may return the product in new condition, with receipt, within
thirty (30) days for a refund.

This Warranty is made only to the original user. THIS
WARRANTY IS IN LIEU OF ALL OTHER WARRANTIES
OR OBLIGATIONS: EXPRESSED OR IMPLIED. SHADIN
EXPRESSLY DISCLAIMS ALL IMPLIED WARRANTIES
OF MERCHANTABILITY OR FITNESS FOR A
PARTICULAR PURPOSE. PURCHASER AGREES THAT
IN NO EVENT SHALL SHADIN BE LIABLE FOR SPECIAL,
INCIDENTAL OR CONSEQUENTIAL DAMAGES,
INCLUDING LOST PROFITS OR LOSS OF USE OR OTHER
ECONOMIC LOSS. EXCEPT AS EXPRESSLY PROVIDED
HEREIN, SHADIN DISCLAIMS ALL OTHER LIABILITY
TO PURCHASER OR ANY OTHER PERSON IN
CONNECTION WITH THE USE OF PERFORMANCE OF
SHADIN’S PRODUCTS, INCLUDING SPECIFICALLY
LIABILITY IN TORT.

27

Digital Fuel Management System Data (Microflo-L)

Part Number: __________________________

Serial Number: __________________________

Left/Single Transducer Part or Kit Number: _____________________ ____

Left/Single Transducer Serial Number: _________________________

Right Transducer Part or Kit Number: _________________________

Right Transducer Serial Number: _________________________

Installation Date: _________________________

Installed By: _________________________

Group 2 Configuration Selections

O

D(d)

F

W(u)

S

Serial Output Type
Serial Input On/Off

I

Endurance Warning Time
Filter Type
Ignore Loran Warnings
Low Fuel Level

The Continued Airworthiness of the Fuel Flow Indicator is maintained on
condition, with no periodic maintenance required. Shadin highly recommends
checking out the installation during each annual aircraft inspection in accordance
with the post installation check out instructions. The post installation check out
procedure can be found in the appropriate system installation manual.

NOTES:

28

P/N OP91204-38E

6831 Oxford Street

St. Louis Park, MN 55426-4412

U.S.A.

Sales Tel: [phone]
Tech Support Tel: [phone]
International Tel: [phone]
Main/Sales Fax: [phone]
Tech Support Fax: [phone]
Sales E-Mail:
Tech Support E-Mail:
Web Site:

[e-mail]
[e-mail]
www.shadin.com