• True Echo Pulse Radar Level Transmitter For Liquids
  • A PRL Measures liquid in a tank with foam on top. Radar waves penetrate the foam to measure the water level beneath.
  • PRL measures liquid through steam and foam in a tank

True Echo Pulse Radar Level Transmitter For Liquids


Dependable Liquid Level Readings In a Wide Range of Environments

The True Echo™ PRL provides accurate level readings from all types of liquid level measurement, including oil-water interface measurement via additional firmware. 


The True Echo™ PRL brings the unassailably accurate level readings of radar sensors to all types of liquid measurement.

Versatile Materials Two housing materials plus multiple antenna choices equals a sensor that operates anywhere you need it to.

Easy Wiring & Set-up From an isolated 4-20 mA output, to push-button field calibration, everything about the True Echo™ PRL is easy.

Oil-Water Interface Detector A firmware addition adds Oil-Water Interface detection to the True Echo™ PRL's already versatile capabilities.



Available Ranges
PRL-017: 1 to 17 ft.
PRL-050: 1 to 50 ft.
PRL-100: 1 to 100 ft.
6.3 GHz
±0.25% of maximum range
6.1 μA (approx. 2622 digital counts across range)
Material Dielectric
Er > 2


Loop Resistance
RL = (VS - 6) / 24 mA
Input Voltage
12-30 VDC
20-35 VDC (HART)
115 VAC, 60 Hz
230 VAC, 50 Hz
Power Consumption
0.07 A max, 1.68 W @ 24 VDC
1.7 VA for 115/230 VAC


Part 15 for low power communications class II install


Isolated 4-20mA (VAC supply)
3 wire 4-20mA (VDC supply)
2 wire HART


Calibration & Diagnostics


316 Stainless Steel
1.5, 2, or 3 in. NPT
1.5, 2 in. Sanitary Tri-Clamp
13 in. Ø 316L SS Bottom Flange
Teflon Rod
Teflon Rod w/ Sanitary Tri-Clamp
316L Stainless Steel 6” Ø Horn
High Temperature Teflon Rod
High Temperature 316L SS Horn


Probe Operating Temperature
Standard: -40 to 176° F (-40 to 80° C)
High Temp: -40 to 350° F (-40 to 177° C)
Sanitary: -40 to 400° F (-40 to 204° C)
Extreme Temp: -40 to 572° F (-40 to 300° C)
Enclosure Operating Temperature
-40 to 140° F
Maximum Process Pressure
Standard Temp/Pressure: 5 bar (72.5 psi)
Standard Temp/High Pressure: 70 bar (1015.3 psi)
High/Sanitary/Extreme Temps: 2 bar (29.0 psi)
Protection Rating