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P651 Sound Velocity Calibration
To perform a Sound Velocity Calibration:
With the sludge at a low level, and unagitated...
1. Press
2. Repeat step 2 at least 5 times to overcome Echo Lock (P721) and verify
repeatability.
3. Measure the actual distance* (e.g. with a Sludge Judge).
4. Enter the actual value. (Velocity parameters P653 and P654 are adjusted
accordingly).
Values:
* When Operation (P001) for the Point Number displayed is set for:
•
"level", the distance is from Empty (P006) to the sludge surface.
•
"space", the distance is from Span (P007) to the sludge surface.
•
"distance", the distance is from the transducer face to the sludge surface.
P652 Offset Correction
View the amount of offset applied to the Reading.
This value is automatically adjusted when an Offset Calibration is performed.
Alternatively, if the amount of Offset Correction required is known (and performing
an Offset Calibration is not desired), enter the amount to be added to the Reading
before display.
Values:
P653 Velocity
View the actual sound velocity in water at the current temperature (P664).
When a Sound Velocity Calibration is performed, this value is automatically
adjusted. The change in the sound velocity reflects the characteristics of the
prevailing conditions; i.e. wastewater temperature and turbidity.
Alternatively, if the current sound velocity is known, enter the current sound
velocity. (Refer to TECHNICAL REFERENCE / Sound Velocity).
The units used are m/s if P005 = 1, 2, or 3 (ft/s if P005 = 4 or 5).
Values:
P654 Velocity at 20°C
View the value of the sound velocity in water normalized to 20°C (68°F) used to
calculate Sound Velocity (P653), using Temperature (P664) based on the sound
velocity vs. temperature characteristics of water.
7ML19981BC01
to display the calculated distance*.
-999 to 9999
-999 to 9999
50.00 to 2000 m/s (164.0 to 6562 ft/s)
73
InterRanger DPS300
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