Engine Pressure Ratio (Epr) - GE Druck ADTS 405 User Manual

Druck ADTS 405 User Manual

Engine Pressure Ratio (EPR)

The ADTS 405 may be used to check EPR sensors and indicators. Use Ps for INLET
pressure and Pt for OUTLET pressure.
To carry out an EPR check, the display must be showing pressure units e.g., mbar or
inHg.
To change units in FULL SETUP Mode:
PressSETUP.
Select [UNITS].
Select required pressure units for display using [NEXT], [PREV] and [SAVE].
Use CLEAR/QUIT to return to pressure display.
To change units in MINIMUM SETUP Mode:
Press SETUP.
Select [UNITS TYPE].
Select [PRESS].
Use CLEAR/QUIT to return to the main pressure display. Pressure units cannot
be selected when set-up mode is switched off.
To enter an EPR of 1.8 with inlet pressure of 500 mbar (15 inHg), proceed as follows:
If the display shows "Leak Measure", press LEAK MEASURE/CONTROL to regain
control.
Note: The pressure/vacuum pumps must be switched on.
Press ROC/Ps RATE to select rate of change of static.
Enter required rate of change e.g., 1000 mbar/min, (30 inHg/min).
Press EPR then RATE to select EPR rate.
Enter required value e.g., 5 EPR/min and press ENTER.
Press ALT/Ps.
Enter 500 mbar (15 inHg) and press ENTER.
Press EPR.
Enter 1.8 and press ENTER.
An EPR of 1.8 will quickly be achieved.
Note: EPR testing can also be performed by specifying the actual INLET and OUTLET
values.
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K114 Issue No. 9