Why doesn't TSI's instrument agree with my other instruments?
There are several reasons one instrument may not agree with another.There are differences in how a manufacturer calibrates its own calibration facility. TSI's calibration facility is calibrated with laser velocimetry, which is the same technique used at NIST.While comparing instruments, it is critical to measure in exactly the same location. Sensors placed side-by-side may not read the same, due to flow differences rather than instrument errors.The length of time since the instruments were last cleaned and calibrated can affect their readings.There are different technologies used to measure air velocities: hot-wire, rotary vane, Pitot tube, etc. TSI uses hot wire technology which measures mass air flow.The standard conditions an instrument is calibrated to vary from one manufacturer to another. TSI's standard conditions are 70°F (21.1°C) and 14.7 P.S.I.A. (101.4 kPa).To further discuss instrument discrepancies, please contact Kenelec Scientific