8. Safety
1.
Installation should be undertaken by properly trained staff
2.
Supply voltage should NEVER exceed a maximum of 24 VDC
3.
Make sure the sensor is chemically compatible with your
application
4.
Design a fail-safe system that accommodates the possibility of
sensor and/or power failure.
5.
This sensor should not be used in classified hazardous
environments
The Slope and Offset values of the installed EchoFlo are dependent
on the
“Fill Height”
as entered during the EchoCal configuration
procedure.
NOTE: The following calculations are based on the EchoFlo
being configured with a frequency output.
Manually calculating Slope
Slope = Fill Height ÷ Sensor Span
Sensor Span:
Is the difference between the sensor output at the top
of the “
Fill Height”
(2000Hz) and the sensor output at the bottom
(976Hz). The frequency output of an EchoFlo has a span
of 1024Hz .
Manually calculating Offset
Offset = - (Slope x Sensor output at zero)
Metric example
- you wish to calculate the slope and offset for an
EchoFlo that has been configured with a
“Fill Height”
of 0.75m (75cm).
The following calculations will provide the sensor’s slope and offset:
Slope = 0.75 ÷ (2000-976)
= 0.75 ÷ 1024
= 0.00073
Offset = - (0.00073 x 976)
= - 0.71484
US example
- you wish to calculate the slope and offset for an EchoFlo
that has been configured with a
“Fill Height”
of 30”.
The following calculations will provide the sensor’s slope and offset:
Slope = 30 ÷ (2000-976)
= 30 ÷ 1024
= 0.02929
Offset = - (0.02929 x 976)
= - 28.59375
NOTE: Be sure to record the relevant “Slope” and “Offset”
values.
calculating the echoFlo Slope & Offset
The
“Offset adjust”
function is used to fine tune the depth reading
whenever the sensor is deployed.
1.
Click
“Offset adjust”
from the
“Edit channel”
dialogue box and the
“Channel offset adjust”
dialogue box
appears. The
“Current value”
from the
sensor is displayed at the top of the
window and is updated approximately
once per second.
2.
To adjust the
“Current value”
, enter your current measured value
in the
“Corrected value”
field.
3.
Click on the
“Apply”
button to calculate the new
“Offset”
parameter value for the associated channel. Clicking on the
“Cancel”
button terminates the procedure without altering the offset value.
WARNING: When calibrating a depth channel, measurements
should ALWAYS be carried out from the BOTTOM of the
channel/pipe to the top of the water level
1.
In the
“Configure
channels”
dialogue box
click
“Edit”
and the
“Edit
channel”
dialogue box will
appear. Enter the relevant
“Slope”
and
“Offset”
values
as determined using the
previous calculations.
Alternatively, Table 1 lists
the values for EchoFlo’s
configured with their full
effective sensor range.
entering Slope and Offset
Fine tuning the echoFlo depth reading
WARNING: Be sure to enter the correct values for the selected
depth units
