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The command modes must be used by the user only to make periodical recalibrations of the system in the
process, and are made through:
• Magnetic sensor/Pin CAL
• HART Communication
The event combinations give the following functions:
1.
Autozero
2.
Calibration (CAL)
3.
Reset autozero
1) A
utozero
Application mode
The Autozero function is activated
by :
1) positioning the magnet near the
Autozero label on the shell of the
sensor.
2) Short-circuiting the pin E-F
(external Autozero version).
The magnet has to be maintained
on the Autozero position for a time
within 2 to 5 seconds.
NOTE: For all transmitters with current outputs, during the Autozero phase, output can rise up to 7 mA.
That's a short variation only visible during the Autozero phase; it won't have any effects on the final signal.
Magnetic
2...5 seconds
pen
Warning: the periodical zero ricalibration through the Autozero function must be done at stable tempe-
rature and no pressure in the extrusion chamber.
80636B_MAN_HMF - HWF_05-2022_ENG
8� Command modes
8�1� Using Magnetic pen and Pin CAL
Limits
FS (bar)
% adjustment
≤ 35
> 35, < 100
> 100, < 200
≥ 200
Remove
100
The Autozero effect will be visible after
waiting 2 seconds starting from the fun-
40
ction removal.
20
The precision of the zero value will be
10
defined by the accuracy class of the
sensor.
1) Machine pressure = 0 bar and transducer
powered.
2) Put magnetic pen on marked spot
(2...5 seconds).
3) Remove magnetic pen.
4) Ready !
= marked spot
Result
15
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