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I am just just trying to work out an offset conversion for a sensor I am using, but my transposition is not working out. OK below I will explain:

* Sensor 4 - 20mA coverts to 0 - 20mm/s rms

So:

y = m . x + c

4(mA) = m . 0(mm/s rms) + c therefore tidying up 4(mA) = 0(mm/s rms).m + c

20(mA) = m . 20(mm/s rms) + c therefore tidying up 20(mA) = 20(mm/s rms).m + c

So drawing graph out on paper I make x = 1

Therefore, 20(mA) = 1 . 20(mm/s rms) + c

Transposing 20mA - 20 = c

c = -19.98mA/C

y (mA) = x(mm/ r rms) + c

y (mA) - c = x(mm/ r rms)

so working formula back:

7ma reading on sensor

y (mA) - c = x(mm/ r rms)

7mA -(-19.98mA/C) = 26.98mm/ s rms, which is wrong?

Can somebody help with what I am doing wrong.

Thanks in advance.