1
NGR
S
ensor
4
1
NGR le
v
el sensor
1.1 Principle of operation
The
NGR
uses TDR (Time Domain Reflectometry) technology. This is a process to determine transit
times of electromagnetic waves. The sensor electronics generate a low-energy electromagnetic
pulse, which is linked to and runs along the probe. If this pulse strikes the surface of the liquid to be
measured, a portion of the pulse is reflected there and is conducted back up along the probe path
to the electronics, which then calculate the level based on the time difference between the sent and
the received pulse. The sensor can output this level as a continuous measured value (analog output)
and can also derive two or four freely positionable switching points from it (switching outputs).
1.2 Safety notes
■
Read the operating instructions prior to commissioning.
■
These operating instructions are valid for devices from firmware version 4.00.
■
Connection, mounting, and setting may only be performed by trained specialists.
■
The
NGR
is not a safety component under the EU Machinery Directive.
■
Observe national safety and work safety regulations.
■
Repairs may only be carried out by the manufacturer. Altering or tampering with the device is not
permitted.
■
Wiring work and the opening and closing of electrical connections may only be carried out when
the power is switched off.
■
The radiated power is far lower than that from telecommunication equipment. According to current
scientific research, the operation of this device can be classified as safe and nonhazardous.
■
Incorrect handling or improper use can lead to malfunctions in your application.
1.3 Fields of application
The innovative TDR technology enables reliable level measurement which is largely application-inde-
pendent. The
NGR
is suitable for both continual level measurement and limit level detection in
nearly all liquids.
It is not affected by changes in the properties of the liquids to be measured. The
NGR
can be used
in metal containers or bypass/immersion pipes. A coaxial tube is required for use in plastic
containers.
Summary of Contents for NGR
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