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1. PIN 7 PAGE 22 ELECTRICAL CONNECTIONS CONT EXHAUST GAS TEMPERATURE EGT TYPE K THERMOCOUPLE The ETM 100 is designed to use a Type K Thermocouple to measure Exhaust Gas Temperature Type K Thermocouples use Red and Yellow wires and may or may not have a ground shield usually a braided wire covering If the Type K Thermocouple has a ground shield it can be connected to the Ground post next to the green Upper Connector Most thermocouples are isolated from Ground Engine Block and Aircraft Frame but some may have the negative Red wire connected to Ground The ETM 100 will work with both types of thermocouple TO FUSED SUPPLY BUSS SUPPLY LOWER CONNECTOR PIN 9 TYPE K THERMOCOUPLE CHT RED WIRE iip CONNECTOR PIN 3 CHT YELLOW WIRE UPPER CONNECTOR PIN 4 GROUND SHIELD GROUND POST EGT GND LOWER CONNECTOR PIN 5 PIN 6 PIN 7 PAGE 23 ETM 100 BACK PANEL UPPER CONNECTOR THERMOCOUPLE INPUTS 1 CHT INPUT 2 CHT INPUT 3 EGT INPUT 4 EGT INPUT RED WIRE WHITE WIRE RED WIRE YELLOW WIRE TYPE J THEROCOUPLE TYPE K THEROCOUPLE 1234 OOOO O a a a GND CHT EGT LOWER CONNECTOR 1 N C 2 N C 3 VDISP DISPLAY BRIGHTNESS CONTROL VOLTAGE INPUT 4 VBKLT BACKLIGHT BRIGHTNESS CONTROL VOLTAGE INPUT 5 GND GROUND 6 GND GROUND 7 GND GROUND 8 ALRM ALARM OUTPUT OPEN COLLECTOR 9 POWER INPUT APPENDIX A2. and airspeed but they may still vary slightly The ETM 100 samples EGT and CHT 250 times a second and displays a running average of their values As the running averages of these values change the new running averages are immediately available to the LED digital display A digital display that updates with different values 250 times a second can be a distraction to a pilot Therefore the ETM 100 has a default setting to update its display once every 2 0 seconds This update period can be modified from 0 5 seconds to 5 0 seconds in 0 5 second steps using the UPd function PAGE 10 MENU LEVEL 1 FUNCTIONS CONT rES Display Resolution Select FUNC FUNC A SEL FUNC SEL Press and Hold Press and Press SEL Press and Press the FUNC button release FUNC button to release FUNC SEL button for5 seconds button until the Use Up and set and button until the to return until L1 rES function Down buttons store the Return To Main to the appears on the appears on to select the selection LL symbol MAIN MENU display then the display diplay appears on release resolution the display As with the Display Period function the Display Resolution function compensates for the fact that although Exhaust Gas and Cylider Head temperatures tend to stabilize at a steady cruising altitude and airspeed they may still vary slightly The ETM 100 samples EGT and CHT 250 times a second and displays a running average of their values While the Display Period funct
3. Range 0 2000 Degrees F 17 C 1093 C EGT Temperature Accuracy 20 Degrees F CHT Temperature Display Range 0 1200 Degrees F 17 C 649 C CHT Temperature Accuracy 20 Degrees F EGT Sensor Type Type K Thermocouple CHT Sensor Type Type J Themocouple Dimensions H 2 40 x W 2 50 x D 1 50 Weight 4 Oz 114 g Mounting Screws 4 ea 6 32 x L 0 5 Max Upper Connector 4 Pin Screw Terminal Lower Connector 9 Pin DSUB Female 4 40 PAGE 1 BUT TON FUNCTIONS FUNC de B This button is used to select and advance instrument functions for each menu level Holding this button in for 5 seconds will cause the instrument to advance to the next menu level When the instrument is in the MAIN MENU mode these buttons are used to adjust the brightness of the digital display when the DISPLAY BRIGHTNESS function is set to FP Front Panel Otherwise in Main Menu mode these buttons perform no operations In functions of MENU LEVEL 1 MENU LEVEL 2 and MENU LEVEL 3 these buttons are used to select options or to increase or decrease values of the selected function When the instrument is in the MAIN MENU mode this button is used to PEE deactivate the instrument s ALARM for a period of 2 minutes In all other cases the button is used as an Enter button to select and retain the value or setting of the displayed function INDICATORS The F indicator is lit when the instrument is displaying EGT Exhaust Gas Temperature a
4. to measure the thermocouples may incur small microvolt voltage changes over time that may affect the accuracy of the displayed temperatures To adjust for these voltages the Zero points of the ETM 100 inputs can be set and stored in the ETM 100 s electronic memory Once stored these Zero points are used to calculate accurate temperatures from the EGT and CHT thermo couples To set and store Zero points the EGT and CHT thermocouples need to be removed from the green upper connector of the ETM 100 The thermocouple wires are then replaced by short Shorting Wires between pins 1 and 2 and between pins 3 and 4 of the upper connector Shorting wires are supplied with the ETM 100 but any short U shaped 20 Ga or 22 Ga wire can be used ETM 100 123 4 o I 9 iam GND GND CHT U U EGT SHORTING WIRE SHORTING WIRE O Once the shorting wires are in place apply power to the ETM 100 and allow at least 10 minutes for the ETM 100 to stabilize Use the procedure on the following page to set and store the EGT and CHT Zero points Once the Zero points are set remove and save the shorting wires The thermocouple wires can now be re attached If possible perform the Cold CAL setting to assure a correct temperature display PAGE 16 MENU LEVEL 3 INSTRUMENT ADJUSTMENTS EGT C 0 and CHT C 0 Input Zero Adjustments Cont SET EGT C 0 FUNC FUNC FUNC FUNC Press and Hold Press and Hold Press and Hold Press and releas
5. 00 back to its normal operation mode MAIN MENU MENU LEVEL 3 INSTRUMENT ADJUSTMENTS MENU LEVEL 3 L3 is entered from MENU LEVEL 2 by pressing and holding the FUNC button for 5 seconds When the ETM 100 is in MENU LEVEL 3 the user can make fine adjustments to the instrument The Cold CAL adjustment sets the ETM 100 to 32 F when the EGT and CHT sensors are placed in an ice bath The EGT and CHT C 0 functions set Zero points for the instrument s thermocouple inputs The BACK ONE LEVEL function brings the ETM 100 to MENU LEVEL 2 The RETURN TO MAIN brings the ETM 100 back to its normal operation mode MAIN MENU PAGE 3 MENU QUICK REFERENCE MAIN MENU MENU LEVEL 0 ENGLISH METRIC Display Display Temperatures Temperatures in degrees F in degrees C PAGE 4 Press and hold FUNC button 5 seconds to advance to MENU LEVEL 1 MENU LEVEL 1 DISPLAY AUTO UPDATE DISPLAY BRIGHTNESS DIMMER FREQUENCY RESOLUTION Change display Turn Auto Dim gt Select display Select display brightness function On update time digits control mode and Off period resolution RETURN AND DISPLAY TO MAIN Turn Turn Return to ON or OFF ON or OFF Main Menu PAGE 5 MENU QUICK REFERENCE CONT Press and hold FUNC button 5 seconds to advance to MENU LEVEL 2 MENU LEVEL 2 ALARMS EGT HIGH CHT HIGH TEMP TEMP ALARM ALARM Set High Alarm level in deg F or to OFF RETURN ONE LEVEL TO MAIN Retur
6. 9 ALARM OUTPUT 19 DISPLAY BRIGHTNESS CONTROL INPUT 20 BACKLIGHT BRIGHTNESS CONTROL INPUT 21 CYLINDER HEAD TEMPERATURE TYPE J THERMOCOUPLE 22 EXHAUST GAS TEMPERATURE TYPE K THERMOCOUPLE 23 BACK PANEL DIAGRAM APPENDIX A INTRODUCTION SCOPE This manual provides specifications operating instructions and installation instructions for the ETM 100 Engine Temperature Monitor This manual is for use by persons who are familiar with aircraft aircraft avionics and general electronic principles DESCRIPTION The ETM 100 Engine Temperature Monitor is a solid state instrument that displays Exhaust Gas Temperature EGT and Cylinder Head Temperature CHT on a 4 digit over 3 digit LED display Temperatures can be displayed in english units Degrees Fahrenheit or metric units Degrees Celcius The ETM 100 uses thermocouples to measure EGT and CHT A thermocouple is a sensor made from two different metals that generates a voltage when heated The ETM 100 uses a single Type J Thermocouple to measure CHT and a single Type K Thermocouple to measure EGT Control of the ETM 100 is by a set of 4 buttons on the front panel of the instrument The ETM 100 is a standard 2 1 4 inch instrument and is designed to be mounted in a standard 2 1 4 inch aircraft panel cut out The display brightness and internal backlighting can be controlled by the user SPECIFICATIONS Supply Voltage 10 Vdc 30 Vdc Maximum Supply Current 350 mA EGT Temperature Display
7. AL CONNECTIONS CONT DISPLAY BRIGHTNESS CONTROL INPUT VDISP The brightness of the digital display and indicator LEDs can be contolled by an external voltage applied to Pin 3 of the Lower Connector when the brightness control mode is set to E See MENU LEVEL 1 FUNCTIONS In this mode the display brightness is set by ratio of the voltage at VDISP to the Supply Voltage This way a single potentiometer can be placed between ground and the supply voltage with its center tap wired to the VDISP input Changes or fluctuations of the supply voltage as can happen when lights and avionics are switched on and off will not affect the brightness of the display The display brightness can be set to 16 different levels The display brightness is limited to 16 levels by the instrument s display driver chip To use this function a linear potentiometer valued between 10k ohms and 20k ohms is placed between the instrument supply and ground The center tap of the potentiometer is wired directly to Pin 3 of the Lower Connector The input resistance of this input is 200k ohms and the input is protected by Schottky diodes A single potentiometer can be used to control several Adaptive Interfaces instruments It is suggested that this input not be connected to existing dimmer controls on the panel as the display brightness is usually the opposite of that desired for nighttime instrument lighting bright in sunlight dim at night WIRING EXAMPLE TO PIN 3 OF
8. E INTERFACES SEPARATE CONTROL FUSED SUPPLY BUSS 10k OHM SUP POTENTIOMETER LOWER CONNECTOR PIN 9 LOWER CONNECTOR PIN 4 OPPER CONNECTOR PIN 4 PINS 8 1 LOWER CONNECTOR PIN 5 PIN 6 PIN 7 CCW o 1 BACKLIGHT BRIGHTNESS TO PIN 4 OF OTHER WIRING EXAMPLE 2 ADAPTIVE INTERFACES INSTRUMENTS EXISTING PANEL LIGHTING FUSED SUPPLY BUSS EXISTING DIMMER CIRCUIT V SUPPLY LOWER CONNECTOR PIN 9 EXISTING PANEL LAMPS VBKLT LOWER CONNECTOR PIN 4 ON RS GND UPPER CONNECTOR PIN 4 PINS 8 15 LOWER CONNECTOR PIN 5 PIN 6 PIN 7 PAGE 21 ELECTRICAL CONNECTIONS CONT CYLINDER HEAD TEMPERATURE CHT TYPE J THERMOCOUPLE The ETM 100 is designed to use a Type J Thermocouple to measure Cylinder Head Temperature Type J Thermocouples use Red and White wires and may or may not have a ground shield usually a braided wire covering If the Type J Thermocouple has a ground shield it can be connected to the Ground post next to the green Upper Connector Most thermocouples are isolated from Ground Engine Block and Aircraft Frame but some may have the negative Red wire connected to Ground The ETM 100 will work with both types of thermocouple TO FUSED SUPPLY BUSS SUPPLY LOWER CONNECTOR PIN 9 TYPE J THERMOCOU PLE CHT RED WIRE iip CONNECTOR PIN 1 CHT WHITE WIRE UPPER CONNECTOR PIN 2 GROUND SHIELD GROUND POST CHT GND LOWER CONNECTOR PIN 5 PIN 6
9. ETM 100 NON TSO ENGINE TEMPERATURE MONITOR USER S MANUAL ve In NE TEMPERA TA 5 y j FCN SEL 1390 TEN eV WAAG Adaptive Interfaces Inc 2013 The ETM 100 is not certified by the FAA and is intended for use only in Homebuilt Experimental or Ultralight aircraft Any questions pertaining to the use of this instrument in a particular aircraft should be addressed to your local aviation authorities It is the responsibility of the aircraft pilot to be thoroughly familiar with the operation of the ETM 100 and know its limitations Correct installation of this instrument should be verified by a qualified avionics facility TABLE OF CONTENTS INTRODUCTION SCOPE DESCRIPTION SPECIFICATIONS BUTTON FUNCTIONS INDICATORS MENUS OVERVIEW MENUS QUICK REFERENCE MAIN MENU MENU 0 FUNCTIONS F G MENU 1 FUNCTIONS br DISPLAY BRIGHTNESS CONTROL Ad AUTO DIMMER FUNCTION UPd Display Update Period rES Display Resolution EG EGT Sensor and Display On Off CH CHT Sensor and Display On Off MENU 2 FUNCTIONS ALARMS EGT Alarm Settings CHT Alarm Settings MENU 3 FUNCTIONS INSTRUMENT ADJUSTMENTS Cold Cal Ice Bath Temperature Setting EGT C 0 and CHT C 0 Thermocouple Input Zero Settings SPECIAL FUNCTION Lo E LOW VOLTAGE WARNING SPECIAL FUNCTION PAGE N Q N N 222a NN 323020 13 14 14 14 15 16 17 18 18 TABLE OF CONTENTS CONT ELECTRICAL CONNECTIONS 19 POWER INPUT 19 GROUNDS 1
10. OTHER ADAPTIVE INTERFACES INSTRUMENTS FUSED SUPPLY BUSS 10k OHM POTENTIOMETER LOWER CONNECTOR PIN 9 LOWER CONNECTOR PIN 3 OPPER CONNECTOR PIN 4 PINS 8 1 LOWER CONNECTOR PIN 5 PIN 6 PIN 7 CCW 7 DISPLAY BRIGHTNESS PAGE 20 ELECTRICAL CONNECTIONS CONT BACKLIGHT BRIGHTNESS CONTROL INPUT VBKLT The ETM 100 has an integrated white LED backlight for its front panel graphics The only way to control the brightness of the backlight is to apply a control voltage to Pin 4 of the Lower Connector VBKLT The backlight brightness can be set to 256 levels by the ratio of the voltage at VBKLT to the Supply Voltage This way a single potentiometer can be placed between ground and the supply voltage with its center tap wired to the VBKLT input Changes or fluctuations of the supply voltage as can happen when lights and avionics are switched on and off will not affect the brightness of the backlight To use this function a linear potentiometer valued between 10k ohms and 20k ohms is placed between the instrument supply and ground The center tap of the potentiometer is wired directly to Pin 4 of the Lower Connector The input resistance of this input is 200k ohms and the input is protected by Schottky diodes A single potentiometer can be used to control several Adaptive Interfaces instruments The VBKLT input can also be wired into the existing panel lighting circuit TO PIN 4 OF OTHER WIRING EXAMPLE 1 ADAPTIV
11. TM 100 small voltages microvolts are created at the connection points of the instrument These voltages change with the temperature of the ETM 100 in the panel of the cockpit and can affect the accuracy of the EGT and CHT measurements The ETM 100 has an internal temperature sensor next to the thermocouple connector that is used to compensate for these voltages The Cold Cal adjustment allows the user to set the ETM 100 to a known accurate temperature so that engine temperatures can be displayed even when the engine is cold To make this setting both the EGT and CHT thermocouple sensors must be placed in an ice bath An ice bath can be made by placing crushed ice and a little water in an insulated cup Once placed in the crushed ice the thermocouples should left for at least 10 minutes for their temperatures to stabilize unc Func Func FUNG Press and Hold Press and Hold Press and Hold Press SEL Press and Press the FUNC button FUNC button FUNC button button to release FUNC SEL button for 5 seconds for 5 seconds for 5 seconds set and button until the to return until L1 until L2 until L3 then store the Return To Main to the appears onthe appears on the Cold CAL appears 320 F LL symbol MAIN MENU display then display then on the display calibration appears on release release then release the display PAGE 15 MENU LEVEL 3 INSTRUMENT ADJUSTMENTS EGT C 0 and CHT C 0 Input Zero Adjustments The amplifiers used by the ETM 100
12. an be turned off if needed When turned off the EGT display will showas _ U The 2 EGT modes are as follows EG On The EGT display will show normal temperatures EG Off The EGT display will show PAGE 12 MENU LEVEL 1 FUNCTIONS CONT CH CHT Sensor and Display On Off Fon 28 gt FCN SEL Press and Hold Press and Press SEL Press and Press the FUNC button release FUNC v button to release FUNC SEL button for5 seconds button until the Use Up and set and button until the to return until L1 CH function Down buttons store the Return To Main to the appears on the appears on to turn the selection LL symbol MAIN MENU display then the display CHT Sensor appears on release ON and OFF the display The ETM 100 is designed to use both an EGT sensor and a CHT sensor but there may be a case when a CHT sensor is either not used or non functional If a sensor is not attached to the ETM 100 erronious readings will appear on the display Therefore the CHT function and display can be turned off if needed When turned off the CHT display will showas The 2 CHT modes are as follows CH On The CHT display will show normal temperatures CH Off The CHT display will show PAGE 13 MENU LEVEL 2 TEMPERATURE ALARM SETTINGS EGA High Temperature Alarm FUNC FUNC A SEL FUNC SEL Press and Hold Press and Hold vj Press SEL Press and Press the FUNC button FUNC button button to release FUNC SEL bu
13. ange the brightness of the digital display when lighting conditions change When flying from low light ie clouds dawn to bright sunlight the AUTO DIMMER function will raise the brightness of the digital display to a set level without the need to press the UP DOWN buttons When flying from bright light to low light ie dusk the AUTO DIMMER function will lower the brightness of digital display to a set level After the display brightness is changed with the AUTO DIMMER function the display brightness can still be adjusted manually with the UP and DOWN buttons The 2 AUTO DIMMER modes are as follows Ad OFF The display brightness will stay at the level selected by the UP DOWN buttons and will not change as lighting conditions change Ad On The display brightness will raise or lower to set levels when lighting conditions change PAGE 9 MENU LEVEL 1 FUNCTIONS CONT UPd Display Update Period DEFAULT FUNC FUNC A SEL FUNC Press and Hold Press and vj Press SEL Press and Press the FUNC button release FUNC button to release FUNC SEL button for5 seconds button until the Use Up and set and button until the to return until L1 UPd function Down buttons store the Return To Main to the appears on the appears on to set the selection LL symbol MAIN MENU display then the display Display Update appears on release Period in seconds the display Exhaust Gas and Cylider Head temperatures tend to stabilize at a steady cruising altitude
14. e Press SEL FUNC button FUNC button FUNC button the FUNC button button to for 5 seconds for 5 seconds for 5 seconds until C 0 set and until L1 until L2 until L3 then appears on store the appears onthe appears onthe Cold CALappears the Upper LED EGT Zero display then display then on the display LED display release release then release SEL Press the SEL button to return to the MAIN MENU SET CHT C 0 FUNC FUNC FUNC FUNC Press and Hold Press and Hold Press and Hold Press and release Press SEL FUNC button FUNC button FUNC button the FUNC button button to for 5 seconds for 5 seconds for 5 seconds until C 0 set and until L1 until L2 until L3 then appears on store the appears onthe appears on the Cold CAL appears the Lower LED selection display then display then on the display LED display release release then release SEL Press the SEL button to return to the MAIN MENU PAGE 17 FUNC Press and release FUNC button until the Return To Main LL symbol appears on the display FUNC Press and release FUNC button until the Return To Main LL symbol appears on the display SPECIAL FUNCTION Lo E Low Voltage Warning The ETM 100 is designed to operate from a supply voltage of 10V to 30V Most aircraft operate on a 12V electrical system voltage is typically around 14V When the supply voltage to the ETM 100 drops to 11V or lower the instruments digital display will flash Lo E for 1 second every 8 sec
15. external control voltage ranging from OV to the supply voltage is applied to pin 3 of the Lower Electrical Connector This voltage is sampled by the ETM 100 and its ratio to the Supply Voltage is calculated into 16 levels This allows a single potentiometer to be connected between ground and the instrument power input and used as a brightness control its center tap used as the pin 3 input See the ELECTRICAL CONNECTIONS section of this manual for details of the control circuit FP FRONT PANEL When the ETM 100 is operating in the ALT or MC mode the UP and DOWN buttons are used to set the display brightness Also see the AUTO DIMMER function PH PHOTOCELL The display brightness is controlled automatically by the amount of ambient light seen by the photocell on the front of the instrument PAGE 8 MENU LEVEL 1 FUNCTIONS CONT Ad AUTO DIMMER FUNCTION FUNC FUNC A SEL FUNC SEL Press and Hold Press and Press SEL Press and Press the FUNC button release FUNC button to release FUNC SEL button for5 seconds button until the Use Up and set and button until the to return until L1 Ad function Down buttons store the Return To Main to the appears on the appears on to turn the selection LL symbol MAIN MENU display then the display Ad function appears on release ON and OFF the display When the display brightness mode of the ETM 100 is set to FP Front Panel control the photocell on the front panel can be used to automatically ch
16. ion limits the number of times new values are presented to the pilot the Display Resolution function limits the changes in displayed values The ETM 100 has a default Display Resolution setting of 5 degrees F or C Therefore the displayed values only change when they increase or decrease by 5 degrees F or C The Display Resolution can be set to 1 5 or 10 degrees F or C A Display Resolution of 1 degree will cause the display to show more precise values but values will tend to change more often and may be a distraction to the pilot A Display Resolution of 10 while less precise will cause the display to change values less often PAGE 11 MENU LEVEL 1 FUNCTIONS CONT EG EGT Sensor and Display On Off TE P FCN seL FUNC FUNC A FUNC SEL Press and Hold Press and Press SEL Press and Press the FUNC button release FUNC v button to release FUNC SEL button for5 seconds button until the Use Up and set and button until the to return until L1 EG function Down buttons store the Return To Main to the appears on the appears on to turn the selection LL symbol MAIN MENU display then the display EGT Sensor appears on release ON and OFF the display The ETM 100 is designed to use both an EGT sensor and a CHT sensor but there may be a case when an EGT sensor is either not used or non functional If a sensor is not attached to the ETM 100 erronious readings will appear on the display Therefore the EGT function and display c
17. n to Main Menu Return to level in deg F LEVEL 1 or to OFF MENU LEVEL 3 COLD TEMPERATURE AND ZERO SETS 320 F TEMP SET Ice Bath Temperature Value EGT INPUT ZERO CALIBRATION Set 0 0 V EGT Input Point CHT INPUT ZERO CALIBRATION Set 0 0 V CHT Input Point PAGE 6 RETURN RETURN ONE LEVEL TO MAIN Return to Main Menu Return to LEVEL 2 FUNCTIONS MAIN MENU MENU LEVEL 0 FUNCTIONS In this mode Exhaust Gas Temperature and Cylinder Head Temperature are displayed in ENGLISH units EGT and CHT are displayed in Degrees Fahrenheit Ce In this mode Exhaust Gas Temperature and Cylinder O RU a C Head Temperature are displayed in METRIC units EGT de and CHT are displayed in Degrees Celcius FUNC Press and release FUNC to change from FtoC PAGE 7 MENU LEVEL 1 FUNCTIONS br DISPLAY BRIGHTNESS CONTROL FUNC A SEL FUNC SEL Press and Hold Press SEL Press and Press the FUNC button v button to release FUNC SEL button for 5 seconds Use Up and set and button until the to return until L1 then br Down buttons store the Return To Main to the appears on the to select the mode LL symbol MAIN MENU display then brightness appears on release control mode the display The brightness of the digital display and the indicator LEDs can be set to 16 different levels and be controlled in 3 different modes These modes are as follows E EXTERNAL CONTROL VOLTAGE An
18. nd CHT Cylinder Head Temperature in Degrees Fahrenheit or English mode The C indicator is lit when the instrument is displaying EGT Exhaust Gas Temperature and CHT Cylinder Head Temperature in Degrees Celcius or Metric mode PAGE 2 MENUS OVERVIEW The ETM 100 is controlled through a series of menus and functions MAIN MENU The MAIN MENU MENU LEVEL 0 allows the pilot to view EGT Exhaust Gas Temperature and CHT Cylinder Head Temperature in either English or Metric units MENU LEVEL 1 INSTRUMENT SETTINGS MENU LEVEL 1 L1 is entered from MENU LEVEL 0 by pressing and holding the FUNC button for 5 seconds When the ETM 100 is in MENU LEVEL 1 the user can change the instrument s optional settings These settings include the digital display s BRIGHTNESS CONTROL mode the AUTO DIM function the display UPDATE PERIOD and the DISPLAY RESOLUTION The RETURN TO MAIN function brings the ETM 100 back to its normal operation mode MAIN MENU MENU LEVEL 2 ALARMS MENU LEVEL 2 L2 is entered from MENU LEVEL 1 by pressing and holding the FUNC button for 5 seconds When the ETM 100 is in MENU LEVEL 2 the user can set the high level alarms for EXHAUST GAS TEMPERATURE EGT and CYLINDER HEAD TEMPERATURE Alarms can be set to OFF or to EGT values of 800 F to 1900 F and CHT values of 500 F to 900 F Alarms are set in English units The BACK ONE LEVEL function brings the ETM 100 to MENU LEVEL 1 The RETURN TO MAIN brings the ETM 1
19. onds This function is designed to give a pilot warning that there may be a problem with the aircraft s electrical system The Lo E function is hardwired into the design of the instrument an can not be disabled PAGE 18 ELECTRICAL CONNECTIONS POWER INPUT The ETM 100 is designed to operate from a supply voltage of 10V to 30V with a maximum current draw of 350 mA Power is supplied to the instrument through Pin 9 of the Lower Connector The ETM 100 uses an internal switching voltage requlator so so no external components are needed when changing from a 12V to a 28V electrical system GROUNDS The case of the ETM 100 is connected to the electrical ground of the instrument Electrical ground connections are provided to the ETM 100 on pins 5 6 and 7 of the Lower Connector Two posts on either side of the thermocouple connector are grounding points for the ground shields of thermocouple cables All grounds are connected internally on the ETM 100 ALARM OUTPUT The Alarm Output is on Pin 8 of the Lower Connector This output is used with the Alarm function to drive a warning lamp or audio alarm The output uses an open collector transistor that can sink up to 300 mA The pull up voltage of the load can be 40 Vdc or less The output is decoupled by a 100 pF capacitor to ground FUSED SUPPLY BUSS FUSED SUPPLY BUSS V LOWER CONNECTOR V ALRM PIN 8 AUDIO BUZZER ALARM INDICATOR LAMP LOWER CONNECTOR ALRM PIN 8 PAGE 19 ELECTRIC
20. tton for 5 seconds for 5 seconds Use Up and set and button until the to return until L1 until L2 then EGA Down buttons store the Return To Main to the appears on the appear onthe to select the Low selection LL symbol MAIN MENU display then display then Temperature appears on release release Alarm value the display The EGT HIGH TEMPERATURE ALARM can be cycled OFF and from 800 PF to 1900 PF in 10 PF steps CHA High Temperature Alarm FUNC FUNC FUNC A FUNC Press and Hold Press and Hold Press and v Press SEL Press and FUNC button FUNC button release FUNC button to release FUNC for 5 seconds for5 seconds button until the Use Up and set and button until the until L1 until L2 CHA function Down buttons store the Return To Main appears on the appears on the appears on to select the High selection LL symbol display then display then the display Temperature appears on release release Alarm value the display The CHT SEL HIGH TEMPERATURE p s ALARM can be cycled OFF nn and from 500 OF to 900 F SEL button O in 10 YF steps to return to the MAIN MENU PAGE 14 MENU LEVEL 3 INSTRUMENT ADJUSTMENTS Cold Cal Ice Bath Adjustment TO PERFORM THIS SETTING BOTH THERMOCOUPLES NEED TO BE REMOVED FROM THE ENGINE AND PLACED IN AN ICE BATH AT 320 F THIS SETTING REQUIRES THAT BOTH AN EGT Type K AND A CHT Type J THERMOCOUPLE SENSOR BE CONNECTED TO THE ETM 100 When thermocouples are connected to the E
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