47
Sensor Installation
power, keep bubble rates at one bubble per second. Set the Auto-Purge intervals to at least
30 minutes.
To set the bubble rate, highlight the
SET BUBBLE RATE
selection using the
UP
and
DOWN
arrow soft keys, then press the
SELECT
soft key. Enter the bubble rate number from 1 to
5, then press the
ACCEPT
soft key to save the changes.
Calibrate Bubbler Procedure
1.
From the Main Menu, select
OPTIONS>ADVANCED
OPTIONS>CALIBRATION>BUBBLER.
2.
Set the Bubble Rate to 2 or 3 (or approximately 1 bubble per second).
3.
Install 3 ft of new bubbler tubing from the flow meter to a graduated cylinder filled with
at least 16 cm (6 in.) of water. Make sure that the tubing is held securely in the
cylinder and cannot move during calibration.
Note:
Always recheck the Level Adjust when reinstalling the flow meter following a calibration. (See
.)
4.
Select
CALIBRATE BUBBLER from the Bubbler Calibration menu. Carefully measure
the depth of the bubbler line with a ruler. Measure from the surface of the water to the
bottom of the bubbler line
(ignore the bubble).
5.
Enter the new depth using the numeric keypad. Press
ACCEPT
. The current reading
is shown for reference. This depth value is always entered in the unit of measure that
was selected in the Setup menu (inches centimeter, etc.)
Auto Purge
When enabled, Auto-Purge will cause a one-second high pressure purge of the bubble
line on a user-defined time interval. This purge will clear debris such as silt from around
the end of the bubble line, and to prompt trouble-free and accurate operation, even in
high solids applications. Select
AUTO-PURGE
from the bubbler calibration menu and
press
CHANGE CHOICE
to enable or disable Auto-Purge. If enable is selected, the
Auto-Purge interval screen is then displayed. Enter an interval between 5 and 90 minutes
using the numeric keypad, then press
ACCEPT
.
Содержание Sigma 950
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Страница 20: ...18 Introduction...
Страница 34: ...32 Basic Programming Setup...
Страница 50: ...48 Sensor Installation...
Страница 82: ...80 Maintenance...
Страница 83: ...81 Appendix A Program Flow Charts Figure 22 Overview of Basic Program Menus...
Страница 84: ...82 Program Flow Charts Figure 23 Setup Flow Chart...
Страница 85: ...83 Program Flow Charts Figure 24 Options Flow Chart...
Страница 86: ...84 Program Flow Charts Figure 25 Alarms Menus Flow Chart...
Страница 87: ...85 Program Flow Charts Figure 26 Calibration Menus Flow Chart Page 1...
Страница 88: ...86 Program Flow Charts...
Страница 102: ...100 Programming Features...
Страница 106: ...104 Primary Devices Head Measurement Locations...
Страница 126: ...124 SCADA Modbus System Guidelines...