24 autozero (diag/service), 24 autozero (diag/service) -103 – Yokogawa RotaMASS 3-Series User Manual

Page 175

7. pArAMETEr dESCrIpTION

7-103

IM 01R04B04-00E-E 8th edition March 01, 2011 -00

7.24 Autozero (diag/Service)

IMPORTANT

Autozero

Mass flow zero setting.

Please set zero under process conditions after warming up the
converter.

Zero tuning

Select:

Inhibit, Enable

Autozero time

Select:

3 min, 30 sec

Select the duration of autozero performing.
Recommended: 3 min

Autozero Exe

Select:

Execute, Not Execute

Execute is selected Autozero is started. After autozero execution

the autozero value is indicated for 3 seconds and the date should be
entered (format: dd/mm/yyyy).
Pressing SET stores value, date, temperature and density in autozero
history.
Note: Autozero function can’t be terminated. Autozero value will be
calculated and used once the function has been started!

Autozero value

Result of

Autozero Exe

Autozero check: Autozero history Indicates 5 latest autozero values with date of execution, temperature

and density during execution (only if date has been entered).

This function allows checking the quality of autozero condition and
long term zero drift.

Autozero check: Autozero initial Indicates the factory autozero value

Autozero check: Autozero range Indicates the typical maximum autozero range. If this range is exceeded

during autozero the warning W06 is generated. Check the detector
installation!

Autozero check: Autozero
fluctuation range

Warning: If the sensor model is
changed Autozero fluctuation
range is zero.

Indicates the factory Autozero fluctuation range determined during
calibration. If this range is exceeded during autozero the warning W07
is generated. Check the electrical installation, the plant vibration and
the density (is the detector fully filled?).

- Stop flow before starting autozero (valve on output).
- During autozero time
- Flow is fixed to zero
- Totalizer stops counting
- Display keys do not work

Additional information and how to start autozero and how to read autozero history is described in chapter
5.6 "Zero adjustment".