Hartridge CRi-PC Operating And Servicing Manual page 99

HARTRIDGE LIMITED
4. Wait for the backleak temperatures to rise to between 50 and 60C.
demands can be altered if the temperatures are taking a long time to increase (these
demands can only be changed during step 1 of the audit, thereafter they are disabled).
The audit will not proceed unless the backleak temperatures are within limits.
5. Press [Next] to go to Step 2, Permanent Drain Mode. This switches off the backleak
metering valve to empty the measurement tubes, and switches off the injectors.
'Backleak Raw Value' mV values will now be shown; wait a few seconds for them to
stabilise (as the tubes drain). Values in the range of 500 to 2500 are acceptable.
6. Press [Next] to go to Step 3, Zero Readings. This records the mV offset readings and
then zeroes the mV values (the values will fluctuate at 0 +/-2mV).
7. Press [Next] to go to Step 4, Permanent Fill Mode. This energises the backleak metering
valve so that the measurement tubes start filling, and switches on the injectors. The mV
values will increase until the measurement tubes are full; wait until the values stop
increasing (this should be at values around 800 – values between 784 and 816 are
acceptable).
8. Press [Next] to go to Step 5, Leak Check. This records the 'max fill' values, and prompts
to stop the motor.
9. Once the motor is stopped, the audit waits for 10 seconds for stability, and then records
the values at the start and end of a 1-minute leak check time. The difference between the
leak test start and end readings is shown on the 'Back Leak Rate' line and should be less
than 10 mV/min.
10. At the end of the audit, press [Save] to save the audit log file. This is useful to keep for
your own records and may also be requested by Hartridge to assist in diagnosing
problems. The default filename and location is:
C:\CRiPC\Log\BackleakAudit_date_time.txt.
HL037 (EN), Issue 13, AT714, 05/14
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CRi-PC Operating and Servicing Manual
Figure 5.5 Backleak Audit
The default
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