Electronic Flow Sensing
Electronic flow sensor (EFS) calibration
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Note: The HP 5890 has a timer function that may be used as an aid
in measuring flow rate (see the Operating Manual, Chapter 4).
Press
TIME
to access the timer function.
After obtaining the desired flow rate, press:
CLEAR
.
2
ENTER
to return to setting the gain value.
EFS channel A is assumed. Press
B
if Channel B is being
calibrated.
4. Allow ample time for flow rate to equilibrate (no drift should be
observed).
5. Assuming no drift in measured flow rate, note the flow rate value at
the connected flow•measuringdevice. Enter this measured value
through the keyboard:
Measured Value
ENTER
Upon pressing
ENTER
, CALIBRATING is displayed.
6. After a short time, GAIN A (or GAIN B) is again displayed, followed by
the observed flow rate and a new gain calibration value based upon
the measured flow rate.
Note that the displayed flow rate value now should be quite close to
the measured flow rate value. If not, drift may have occurred, so the
process should be repeated.
7. This completes EFS calibration. Remove the flow•measuringadapter,
reconnect channel OUT fittings (use two wrenches in opposition to
avoid twisting tubes), replace the left side panel, and restore the
instrument to service.
