Hach Sigma 950, Инструкция по эксплуатации инструмента, Страница: 42 / 146

40
Sensor Installation
6.3.3 Submerged Area/Velocity Sensor Programming
1. If the flow meter is equipped with multiple sensors, from the Main Menu, select
OPTIONS>LEVEL SENSOR.
2. Select Submerged Xducer using the
CHANGE CHOICE
soft key, then press
ACCEPT
.
3. From the
MAIN MENU
, select
SETUP>MODIFY SELECTED ITEMS.
4. Highlight Velocity Direction using the
UP
and
DOWN
soft keys. Press
SELECT
to
continue.
5. Set the velocity direction (upstream, downstream, or always positive) using the
CHANGE CHOICE
soft key.
6. Press
ACCEPT
to continue.
7. Highlight Velocity Units using the
UP
and
DOWN
soft keys. Press
SELECT
to continue.
8. Set the Velocity Units (fps or m/s), using the
UP
and
DOWN
soft keys. Press
ACCEPT
to continue.
9. Highlight Velocity Cutoff, using the
UP
and
DOWN
keys. Press
SELECT
to continue.
10. Read the Velocity Cutoff information screen. Press any key to continue.
11. Set the Velocity Cutoff using the numeric keypad. Press
ACCEPT
to continue.
12. Set the Velocity Default, using the numeric keypad. Press
ACCEPT
. Press
RETURN
to
go back to the Setup Menu or the Main Menu key to return to the beginning.
6.3.4 Submerged Area/Velocity Sensor Calibration.
Note: The data is constant if the difference between the level reading of the flow meter and the
independent verification is constant; recalibration is not required.
The manufacturer recommends calibrating the Submerged Area/Velocity Sensor when:
• The sensor is first used.
• Installing a new or different sensor on a flow meter or input receptacle.
• The difference between the level reading of the flow meter and the independent
verification (measurement with a dipstick and ruler) is increasing.
Note: Errors are caused by variation in site conditions and measurement abilities. These errors may
cause slight changes in the difference, therefore, not indicating a true change in the difference.
1. From the Main Menu, select
OPTIONS > ADVANCED OPTIONS > CALIBRATION >
SUBMERGED PROBE.
2. Place the sensor flat on a table top or floor with the sensor (the plate with holes)
facing down onto the surface.
3. Press any key to continue.
6.4 Low Profile Velocity-Only Sensor
The Low Profile Velocity-Only Sensor is an extremely low-profile velocity sensor. It does
not measure level; therefore it is usually used in conjunction with the in-pipe ultrasonic
G depth (-) black
H depth (+) white
Table 13 Submerged Area/Velocity Sensor Connection Pin Assignments
Pin Signal Description Wire Color