ProGap – Level detection

Microwave barrier for contactless detection of dry bulk solids in containers,
in pipes or in shafts

  • Simple and uncomplicated retrofitting
  • Reliable fill level and limit level detection
  • Detection through all non-conductive walls
  • With process adapter  up to 220 °C and 20 bar pressure possible
  • With ceramic mounting up to 1,000 °C possible
  • Absolutely insensitive to material cakings
  • Can be used up to a  profile of 18 m (larger profiles on request)
  • Compact device – no separate electronics
  • Signalling through relay switching
  • Can also be supplied in short housing with separate electronics

What do you want to do?


The ProGap microwave barrier is a universal sensor with a flexible range of applications, consisting of a transmitter and receiver on the basis of the latest microwave technology. It is used to detect the limit level of dry bulk solids of all types or to position objects.

The microwave barrier is a contactless measuring procedure.
It can be installed in containers, pipelines, shafts or free-fall sections. The range, depending on the model, is either 0 … 4 m or 0 … 18 m. Larger ranges can also be realised. If container walls, housings or pipelines are not metal, it is possible to measure from the outside. This even makes it possible to completely uncouple the measurement from the process through suitable windows made of non-metallic materials. This is especially interesting in the use of aggressive, abrasive or coarse materials or in cases of extreme pressures and temperatures. The ProGap can also be used under difficult conditions such as high operating temperatures and pressures with the help of a process-adapter. The use of microwaves also ensures a high level of insensitivity to any caking on the sensor window.

Mounting and Installation

The transmitter and receiver are installed by screwing into a  G 1 ½” threaded connection.
The device can be installed at any installation height.

It is important that the transmitter and receiver have the same installation height. The adjustment takes place with the help of a counter-threaded connection.
A display of the signal intensity facilitates the adjustment. The connection to the power supply takes place on the transmitter and the receiver.
The switch output is made available on the receiver. No additional analysis unit is necessary.

Technical Data
Sensor Material Housing: Stainless steel 1.4571
Sensor-isolation: POM
Protection system IP 65; DustEx (optional)
Working temperature – 20 … + 80 °C
– 20 … + 220 °C (with process-adapter)
Max. 1000 °C (with ceramic-flange)
Ambient temperature – 20 … + 60 °C
Working pressure Max. 1 bar
Max. 20 bar (with process-adapter)
Detection range 0 … 4 m
0 … 18 m
> 18 m (on demand)
Power supply 24 V DC (-10/+15 %)
24 V AC (-10/+15 %)
Power consumption Approx. 1.8 VA
Current consumption Max. 100 mA
Relay output (max.)
– voltage
– current
– capacity
120 V AC/DC
1.25 A
150 VA, 50 W
Response time 0.25 s … 5 s (continuously adjustable)
Measuring frequency K-BAND 24.125 GHz (± 100 MHz)
Transmitting power Max. 5 mW
Weight Transmitter: 1.1 kg
Receiver: 1.1 kg

Application Examples

Click on a desired application example to navigate to a detailed description.

Fill level monitoring

Limit level monitoring of beer foam
in a brewery

Level detection of derived fuels
in a waste chute

Fill level monitoring of chemicals
from the outside through the pipe

Limit level monitoring of wood chips

Limit level monitoring of gypsum rock

Limit level monitoring of paper fibers

Global Technology Systems

P.O. Box 799 Shalimar, FL 32579. USA
(850) 651-3388
[email protected] 


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