Levelcom 100 - Page 74

Page 74
©2013 Technical Marine Service, Inc. LC-100 V2.97
8. Disconnect the calibration gauge / hand pump assembly from the PORT 1 DRAIN fitting
and press ACK to recheck the zero offset value. If the zero offset value is different than it
was when measured before, repeat steps 3 through 6 until both measurements are
correct.
9. Select “CHAN-1” from the Calibrate menu. Re-connect the calibration gauge / hand
pump assembly to the PORT 1 DRAIN on the LevelCom 100.
10. Using the hand pump and calibration gauge apply the following pressure to the LevelCom
100 based on the pressure sensor type installed:
15 PSI 400.0" H
2
O (14.45 psi)
30 PSI 800.0" H
2
O (28.90 psi)
100 PSI 1200.0" H
2
O (43.35 psi)
100 PSI 16 bit 2400.0" H
2
O (86.70 psi)
11. The LevelCom 100 display should show a number near 3200. Adjust the GAIN-2
potentiometer until the correct reading of 3200 is on the display. (Refer to Figure 23 for
the location of the GAIN-2 potentiometer)
12. The calibration is complete. Remove any fittings that were attached for calibration, and
return the LevelCom 100 to normal operation. Verify that it is reading the correct depth
for the liquid in the tank.
Note: Remember that the LevelCom 100 reads out differently in different parts of the above
procedure. When you are setting the zero level the LevelCom 100 is reading out unscaled
numbers from the Analog to Digital converter on the sensor board. At this point there will be
no decimal point shown. When you are setting the span value the LevelCom 100 will display
pressure in inches of water. Since the LevelCom 100 displays with a resolution of 0.1 inches
you will see a decimal point on the display. The ACK button toggles between these two
states. It is very important that there is no pressure on the system when you toggle to the
state for setting the span. The zero reading you set is read and used to process the span
reading and the zero is recorded when the ACK button is pressed.
The readings on the display are filtered to reduce noise for readability. To reduce waiting
time press the MODE button to bypass the filter algorithm. When the MODE button is
released the filter functions as usual.