FlowLine EchoPulse EchoPro LR30 Series Quick Start Manual

EchoPulse
Radar Liquid Level Transmitter
Addendum for LR30 & LR31 Series
CONFIGURE LR30 OR LR31 TO A PRESSURE TRANSMITTER RANGE
Pressure Transmitters have a fixed span so the 4-20mA output cannot be changed and the application must
accept the span as is. In a typical application where a pressure transmitter is used, the location of 4mA will be
at the bottom of the tank (see below). The 20mA will be located well above the top of the tank due to the fixed
span of the device (see below).
Radar transmitters have a span that is adjustable to match the shape of the tank. Typically, the 4mA will be
located at the bottom of the tank and the 20mA will be located at the Full level of liquid (see below).
4-20mA span w/ Pressure Transmitter
The radar transmitter can be configured to match the fixed span of a pressure transmitter.
instructions below to configure your radar transmitter like a pressure transmitter.
STEP 1 – IDENTIFY THE SPAN OF THE PRESSURE TRANSMITTER
To span DataView™ to the full span of the pressure sensor, you will need the following information:

Maximum Pressure (MP) of the sensor in psi

Specific Gravity (SG) of the liquid

Units of operation (Feet or Meters)

Maximum Liquid Height (MLH)
o The equivalent height of liquid (in a virtual tank) at the full span of the transmitters (at 20mA)
To calculate MLH in Feet MLH = (MP x 2.31) / SG

 To calculate MLH in Meters MLH = (MP x 0.704) / SG
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4-20mA span w/ Radar Transmitter
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