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8 Outputs
8.1 4–20mA Output Setup
The 4–20mA output of the sensor is scaled as:
• 4 mA = (Tank is Empty) = (Level is 0) = (Distance is Installation Height),
• 20 mA = (Tank is Full) = (Level is maximum height) = (Distance is Installation Height – Maximum
Height).
The 4–20mA analog signal can be converted to one of four values (Level, Distance, Volume Remaining, or
Volume Consumed) in the controller receiving the output according to the above scale. For example, a
nominal 100-gallon vertical tank, the maximum height is 36 inches and installation height is 42 inches. The
tank volume is 100 gallons when it is filled up to the maximum height 36 inches. The controller should be
set up to convert 20 mA to 100 gallons, at which the tank is full and the tank level is 36 inches and the
distance measured is 6 inches.
*
NOTE
*
The nominal capacity provided by the tank manufacturer may be greater than the
maximum safe (net or effective) capacity that can be practically filled. Please keep this in
mind as you configure your LS-200 for practical purposes.
8.2 Communication Using Modbus RTU
The sensor can be configured as a Modbus slave device via RS-485. In addition to the level, volume, and
distance, many operational parameters, including warning and error messages, are available via a Modbus
RTU connection. Contact Pyxis Lab Customer Service (
service@pyxis-lab.com ) for more information.
9 Sensor Maintenance and Precaution
For best performance, keep the sensor ultrasonic surface clean using a soft cloth or towel. Notice that
sometimes the maximum sound pressure level inside the beam area is up to 165dB, which exceeds the
standard safe limit of 110dB. Never point the probe at the eye. The directivity pattern of the probe is
shown in Figure 16.
Figure 16. Directivity pattern of the LS-200
LS-200 User Manual service@pyxis-lab.com | +1 (866) 203-8397 13