Hi all, 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.