I´ve some machines that use liquid fuel, in Mark V, i calculate the control constant KFQLM1 by the control spec procedure for frame V, i´ve a diferent density and diferent flow divider rating but i haven´t a clear way to calculate the LIQ_GAIN.

I would like take my flow from flow divider for my report but i have for ever some litres minus. In the other way, i´m not sure in Mark V, when i say IMPERIAL UNITS, do i use Gallon (US) or Gallon (UK) ?

Thanks in advance

 

1) Get your flow divider rating from the Control Spec. or from CONST.SRC which should be PR_3_MAX = RPM for 100% flow divider speed.

2) When you are running,check the flow divider speed and calculate the %age speed from step 1)

3) Check METRIC.SCA or ENGLISH.SCA for the value for KFQLM1, one is Kg/sec/% and the other is lbs/sec/%. Calculate for the %age speed from 2) above and this will give you FQLM1 in either kg/sec or lbs/sec

4)Now you need your fuel Specific Gravity, usually 0.83 for diesel, so 1Kg of diesel is approx. 1.205 lts. This is possibly where your error could be if you don't have the exact S.G. for the fuel

5) If your Control Specification gives you a flow divider rating as x gpm for y rpm, the gpm is US Gallons. I would rather do the calculation, it should be more accurate.

Good luck and report back

 

It's not exactly clear what you want to do, *but* if you're trying to use the flow divider as a check against some "revenue" quality flow totalizer, it won't work. The Mark V is not built for that kind of accuracy. It can be a rough check but it cannot be used as a "revenue" quality flow totalizer; it just wasn't built for that purpose or that kind of accuracy.

I believe the writing of data to the memory area for counters and accumulators (including timers) does not occur at the frame rate. There are slow-voted values and fast-voted values. It's my presumption that counters and accumulators are slow-voted and that accounts for the missing liters. In other words, the sampling rate for the counter and accumulator functions and writing the values to memory is not the same as for the CSP execution. For most functions, the accuracy is fine. But, for those who want to totalize fuel flow against a high quality meter which uses temperature and other biasing values, it just won't work.

The units would be US gallons.