MGL Avionics Blaze ASI-5 User manual

Introduction
The ASI-5 is a 3 1/8” sunlight readable instrument that provides a wide range airspeed indication in both digital and
analog tape ormats. Airspeed is based on the pressure generated by a pitot tube system and a static port is provided as
well or use by high speed aircra t. In addition, the ASI-5 provides a light timer since takeo and records the maximum
airspeed reached.
Airspeed can be indicated in statute miles per hour (mph), kilometers per hour (km/h) or nautical miles per hour (kts). The
analog airspeed tape can be scaled according to the aircra t’s lying speed range and ranges or Vs0, Vs1, V e, Vno and
Vne can be set. The ASI-5 also provides a programmable Vs and Vne airspeed alarm output. ASI sensitivity can be
calibrated by the user to cater or errors caused by pitot tube placement.
The ASI-5 instrument measures airspeed rom 16mph to 250mph and is well suited to slower aircra t due to very good
sensitivity and linearity at low air speeds.
1 Features
•Large 2.6” high resolution 320x240, IPS (fully viewa le in all directions), sunlight reada le color LCD
display
• Measures airspeed from 16mph to 250mph and is well suited to slow aircraft due to very good sensitivity
and linearity at low air speeds
• Includes a flight timer since takeoff
• irspeed units can be set to miles per hour (mph), kilometer per hour (km/h) or nautical miles per hour
(kts)
• nalog tape with programmable ranges for Vs0, Vs1, Vfe, Vno and Vne
• Contains a programmable Vs and Vne airspeed alarm output
• Records maximum airspeed reached in permanent memory
• Standard 3 1/8” aircraft enclosure (can be front or rear mounted)
• The LED backlight can automatically adjust to the ambient light, or it can be manually adjusted in the
menu system
• Rotary control plus 2 independent buttons for easy menu navigation and user input
• Wide input supply voltage range of 8 to 30V DC with built in voltage reversal and over voltage protection
for harsh electrical environments
• 1 year limited warranty
Blaze SI-5
irspeed Indicator ( SI)
Operating Manual – English 1.00

Blaze SI-5 Operating Manual Page 2
2 Layout
3 Main Display
F2 / Down Button:
Menu system: So tkey button
Sunlight readable color graphic display:
The backlight can automatically adjust
to the ambient light or it can be manually
adjusted in the menu system
Rotary Control (Up/Down) & Enter Button:
Press the rotary control during the normal display screens to access the menu system. Rotate anti/clockwise or
up/down menu scrolling. Rotate the rotary control during the normal display mode to view the Max Values display.
F1 / Up Button:
Menu system: So tkey button
Normal Display: Start / Stop the
light timer (Manual light only)
3 1/8” enclosure.
Can be ront or rear mounted
Airspeed unit
Digital airspeed
Airspeed tape
Duration o light since takeo
Vso (Min sa e speed, landing)
Vs1 (Min sa e speed, normal)
V e (Max lap speed)
Vno (Max maneuvering speed)
Vne (Max exceed speed)
Ambient light sensor

Blaze SI-5 Operating Manual Page 3
3.1 Maximum irspeed display
This display can be accessed by rotating the rotary control during the normal display
mode. Press the F1/Up button when the max values display is showing to reset the
maximum values to the current airspeed.
3.2 Start / Stop flight display
Press the F1/Up button during the normal display mode
to manually start/stop a light. This key is only active i
the ASI-5 is setup to select the manual light option
under the “TIMERS” setup menu.
Note: The maximum airspeed is stored in non-volatile
memory and is recalled on power-up.

Blaze SI-5 Operating Manual Page 4
4 Menu System
Press the rotary control button during the normal display mode to enter the menu system. Use the rotary control to
navigate through the menu system.
4.1 Exiting the menu system
Press the F1/Up button to exit the menu system when the “EXIT” so t key is shown. All changes made during navigation
o the menu system will be saved in non-volatile memory upon exiting. The instrument will not save any changes i you
remove power be ore exiting the menu system.
4.2 SI Setup ( irspeed Setup)

Blaze SI-5 Operating Manual Page 5
Zero ASI Sensor:
This setup allows your instrument to measure the zero airspeed reading o the airspeed sensor and set a calibration value
internally or this. This is equivalent to some mechanical airspeed indicators that have an adjustment to set the needle to
zero when the aircra t is not moving. You would use this unction occasionally i you see an airspeed reading when the
aircra t is at rest. This may be caused by aging o the built in pressure sensor or related electronics. When this unction is
per ormed make sure that there is no air low into the pitot tube as this would result in an incorrect internal calibration.
ASI Unit:
Select i you want the ASI to be displayed in mph (statute miles per hour), km/h (kilometers per hour) or kts (nautical miles
per hour).
ASI Filter:
This unction can be used to select the signal ilter time constant. Selections are "NONE", “FAST” or “SLOW”. This
selection in luences the rate at which your ASI can change its reading. I you have an installation that su ers rom strong
turbulence at the pitot tube, select “slow”. I you have a very clean air low in ront o the pilot tube you can select “ ast”
which will give you a aster response to airspeed changes.
ASI Span:
Select the maximum airspeed that you want the airspeed tape to display. This can give you increased display resolution.
ASI In View:
Adjust this setting to set the amount o tape to view. For example, setting this value to 30% and your "ASI SPAN" to 250
will result in the tape showing 75 on the display at a time.
Vne Speed: (Max Exceed Speed)
Enter you maximum speed you aircra t should not exceed.
Vno Speed: (Max Maneuvering Speed)
Enter your maximum maneuvering speed.
Vfe Speed: (Max Flap Speed)
Enter the maximum speed that is permissible with the laps extended.
Vs Speed: (Min Safe Speed, Normal)
Enter your minimum sa e speed or normal light o your aircra t
Vs0 Speed: (Min Safe Speed, Landing)
Enter your minimum sa e speed or landing your aircra t
Vs Alarm:
This enables or disables Vs Alarm.
Vne Alarm:
This enables or disables the VNE alarm.

Blaze SI-5 Operating Manual Page 6
Cal:
During the actory calibration a actor has been determined and entered here that will give you accurate airspeed,
provided your pitot tube is not in luenced by pressure e ects caused by air low around your air rame. The calibration is
displayed in % o the reading, you can increase or decrease the reading i required to help cancel out under or over
reading o the airspeed indicator on your aircra t. The original calibration actor has been written onto the back o your
instrument.
4.3 Timers Setup
FLIGHT:
Select whether you want the ASI-5 to automatically detect a light or whether the pilot must press the F1/Up button to
start/stop a light. We recommend you select automatic light detection.
T/O AIRSPEED:
This menu option is only shown i the “DETECT” light mode is selected. Enter the takeo airspeed threshold that you
want the light timer to start incrementing.

Blaze SI-5 Operating Manual Page 7
4.4 MISC Setup (Miscellaneous Setup)
Backlight:
Select manual or automatic backlight control.
Use the rotary control in manual mode to adjust the backlight brightness.
Allow 3 seconds or the display to adjust to the ambient lighting conditions when using
the automatic backlight mode. The display will set the backlight to the dim setting i the
ambient light is less then the threshold setting, alternatively the display will set the
backlight to the bright setting i the ambient light is greater then the threshold setting. The
ambient light received is shown as the ADC value in the top header. Use this value to set
the threshold value.
Security Setup:
Select this menu option i you want to password protect the menu system.
Information:
This menu option displays in ormation about the unit.

Blaze SI-5 Operating Manual Page 8
Default Settings:
Select this menu option to reset all the settings to actory de aults.
4.5 DC Values
This menu displays the ADC value that have been read rom the pressure sensor.
5 Loading factory default settings
Press and hold the F1/Up button and rotary control during power up to load the pre-
programmed actory de ault settings. The ollowing screen will be displayed:
Factory de ault settings can also be loaded in the Miscellaneous setup menu.

Blaze SI-5 Operating Manual Page 9
6 Error Messages
Unit settings CRC error. Load de ault settings to restore to actory de aults. I the error
message still persists then it could possibly be a non-volatile memory ailure in which
case the instrument will then have to be returned to the actory.
Calibration constants CRC error. The instrument could possibly have a non-volatile
memory ailure in which case the instrument will then have to be returned to the actory.
Internal lash CRC error. The instrument does a irmware check on the program when
power is applied to the instrument . I the program is corrupt in any way then the internal
lash CRC error will be displayed. Reload the instruments irmware and load de ault
settings. I the error message still persists then it could possibly be an internal lash
memory ailure in which case the instrument will then have to be returned to the actory.
Max Values CRC error. Load de ault settings to restore to actory de aults. I the error
message still persists then it could possibly be a non-volatile memory ailure in which
case the instrument will then have to be returned to the actory.

Blaze SI-5 Operating Manual Page 10
7 Specifications
Operating Temperature Range -10ºC to 60ºC (14ºF to 140ºF)
Storage Temperature Range -20ºC to 80ºC (-4ºF to 176ºF)
Humidity <85% non-condensing
Power Supply 8 to 30Vdc SMPS (switch mode power supply) with built in 33V over
voltage and reverse voltage protection
Current Consumption Approx. 130mA @ 13.8V (backlight highest setting), 50mA @13.8V
(backlight lowest setting)
Display
2.6” 320x240 IPS color LCD display
Minimum 600cd/m2 brightness
Sunlight readable with anti-glare coating
LED Backlight can be set to automatic or can be manually adjusted
larm Output Open collector transistor switch to ground
Maximum rating 0.25A
Dimensions see Blaze series dimensional drawing
Enclosure 3 1/8” ABS, black in color, ront or rear mounting. Flame retardant.
Weight Approx. 160 grams (Instrument excluding cables)
Non-volatile memory storage 100000 write cycles
irspeed DC resolution 12 bit
irspeed range 16mph to 250mph
irspeed resolution 1 mph
Measurement accuracy +/-1% at 85mph nominal
8 Operating the alarms
The alarm output can be used to switch an external alarm indicator. The external alarm switch is an open collector
transistor switch to ground with a maximum rating o 0.5A DC. It is possible to wire the alarm contacts o several
Stratomaster instruments in parallel should this be desired. To avoid alse activation o the alarms, the alarm unction is
only active 5 seconds a ter the instrument has powered up.
9 Firmware Upgrading
The ASI-5 can be upgraded in the ield by connecting the RS232 port to a PC and running the irmware update program.
Note that only the RS232 port can be used to upgrade the firmware.
Please see the Blaze firmware upgrading document for more information.
10 Cleaning
The unit should not be cleaned with any abrasive substances. The screen is very sensitive to certain cleaning materials
and should only be cleaned using a clean, damp cloth.
Warning: The ASI-5 is not waterproo , serious damage could occur i the unit is exposed to
water and/or spray jets.

Blaze SI-5 Operating Manual Page 11
11 Installation
Connect a pitot tube to the “pressure port” and i required connect the static port. Most small aircra t such as ultralights or
microlights do not require a connection to a static port. In these cases, simply leave the static port open. Ensure however
that the static port does not receive pressurized air due to the orward movement o the aircra t. Be especially critical o
your pod or panel i you do not use a static port. Any build up o a pressure di erential due to ram air or suction can lead
to large errors o the indicated airspeed. Static ports are usually mounted at a strategic position on the rear side o the
aircra t uselage or aster, pressurized aircra t.
The ASI-5 pressure ports take 4mm ID tubing. Use hose clamps to asten the hose onto the ASI-5 pitot and static ports.
The ASI-5 allows you to calibrate the airspeed reading. This is done under the “AIRSPEED SETUP” menu item. The main
reason or this is to be able to remove errors introduced due to the air low around your aircra t which may have an e ect
on your pitot tube pressure.
11.1 Connection Diagram
The use o an external 1A use is recommended. Connect the supply terminals to your aircra ts power supply. The ASI-5
can be used on both 12V and 24V without the use o any pre-regulators. Ensure that the supply voltage will not drop
below 8V during operation as this may result in incorrect readings.

Blaze SI-5 Operating Manual Page 12
11.2 Pressure Port Dimensions
11.3 Cable connections
Main connector (D15HD connector: Unit Female, Cable Male)
12 Warranty
This product carries a warranty or a period o one year rom date o purchase against aulty workmanship or de ective
materials, provided there is no evidence that the unit has been mishandled or misused. Warranty is limited to the
replacement o aulty components and includes the cost o labor. Shipping costs are or the account o the purchaser.
Damage as a result of applying excessive pressure to the pressure ports are excluded from warranty.
D15 Pin Color Function
1 Red 8-30Vdc power via power switch / circuit
breaker and fuse.
2 Black Ground.
3 - RS232 Transmit data (Firmware upgrading)
4 - RS232 Receive data (Firmware upgrading)
15 White larm Output (Open collector)
Note: Product warranty excludes damages caused by unprotected, unsuitable or incorrectly wired
electrical supplies and or sensors, and damage caused by inductive loads.
Inches Millimeters
Min Max Min Max
0.248 0.278 6.30 7.06
B0.420 0.440 10.67 11.18
C0.182 0.194 4.62 4.93
D0.310 0.330 7.87 8.38

Blaze SI-5 Operating Manual Page 13
13 Disclaimer
Operation o this instrument is the sole responsibility o the purchaser o the unit. The user must make themselves amiliar
with the operation o this instrument and the e ect o any possible ailure or mal unction.
This instrument is not certi ied by the FAA. Fitting o this instrument to certi ied aircra t is subject to the rules and
conditions pertaining to such in your country. Please check with your local aviation authorities i in doubt. This instrument
is intended or ultralight, microlight, homebuilt and experimental aircra t. Operation o this instrument is the sole
responsibility o the pilot in command (PIC) o the aircra t. This person must be pro icient and carry a valid and relevant
pilot’s license. This person has to make themselves amiliar with the operation o this instrument and the e ect o any
possible ailure or mal unction. Under no circumstances does the manu acturer condone usage o this instrument or IFR
lights.
IMPORT NT NOTICE:
You must make your own determination i the products sold by MGL Avionics are sa e and e ective or your intended
applications. MGL Avionics makes no representations or warranties as to either the suitability o any o the products we
sell as to your particular application or the compatibility o any o the products we sell with other products you may buy
rom us or anywhere else, and we disclaim any warranties or representations that may otherwise arise by law. Also, we
o er no speci ic advice on how to install any o the products we sell other than passing along anything that may have
been provided to us by the manu acturer or other issues. I you are in need o urther in ormation or guidance, please turn
to the manu acturer, FAA Advisory Circulars and guidance materials, the Experimental Aircra t Association, or other
reputable sources.
Other instruments in the Stratomaster Blaze series
HRS-2 Arti icial Horizon and Magnetic Compass Indicator
LT-6 Altimeter and Vertical Speed Indicator (VSI)
LT-7 Altimeter and Vertical Speed Indicator (VSI) with a transponder compatible RS232 &
parallel Gillham code output
SI-5 Airspeed Indicator (ASI)
SV-2 Altimeter, Airspeed (ASI) and Vertical Speed Indicator (VSI)
EMS-2 Engine Monitoring System
FF-5 Fuel Computer
FLIGHT-3 Primary Flight Instrument
INFO-2 In ormation Display (G-Force meter, UTC and Local Time, Slip Indicator, Outside Air
Temperature (OAT), Battery Voltage, Current and charge display, Flight Timer & Flight
Log, Stopwatch, Countdown Timer and Alarm)
M G-2 Magnetic Compass Indicator
M P-4 Mani old Pressure and RPM Indicator
RPM-2 Universal Engine / Rotor RPM Indicator
TC-5 4 Channel Thermocouple (EGT/CHT) Indicator
TC-6 12 Channel Thermocouple (EGT/CHT) Indicator
TP-4 4 Channel Universal Analog Input (Pressure/Temperature/Current/Volts) Indicator
The manu acturer reserves the right to alter any speci ication without notice.