CiDRA SONARtrac PW VF-100 - Manual (Page 171)

20834-01 Rev 04 Page 8-27
8.7.3 Gain
The sensor pre-amplifier is located within the sensor cover. The
electronic ‘Gain’ (amplification) applied to the sensor outputs can be
accessed through the transmitter ‘Diagnostics’ menu. Transmitter
based gain control functions are provided through three sub-menus
–
‘AUTOSET GAIN’, ‘CHECK/SET GAIN’, and ‘TEST GAIN’. Gain
adjustments should be made to the system when the process is
operating “normally”.
8.7.3.1 AUTOSET GAIN
Autoset Gain performs an automatic test and adjustment of the pre-
amplifier gain setting. It automatically cycles through the pre-
determined gain settings in order to find the optimal gain setting based
on the flow conditions at that time. AUTOSET GAIN should be run
while the process is operating at normal conditions to avoid making an
incorrect gain setting.
8.7.3.2 Check/Set Gain
Check/Set Gain enables the user to check the current gain setting in
the pre-amplifier and to manually set it to one of four settings: 1, 4.65,
21.55, and 98.65.
8.7.3.3 Test Gain
Test Gain performs a test of the system electronics to determine if the
gain setting is optimal. Test results inform the user if the gain is
correct or if there is too much or too little gain. TEST GAIN should be
run while the process is operating at normal conditions to avoid getting
an incorrect gain value.
8.7.4 Self Test
Self Test is a ‘PASS/FAIL’ test performed on the system RAM and
DPRAM (internal memory).
8.7.5 Keyboard Test
Keyboard Test tests the function of each of the keyboard keys. The
alarm LED will light for each key pressed to indicate that the key is
functioning properly
8.7.6 Clear History
Clear History will delete transmitter stored Data History and re-start
saving of transmitter data.