Question 1

1. Can the LW2 radar sensors measure up to 15m?

Accepted Answer

Yes, the sensor can measure beyond the stated data sheet range of 10 m (33 ft) with analog and IO-Link communication, but the ability to do so is application dependent. Factors such as the dielectric constant of the media, presence of foam or turbulences, mounting conditions, etc. all impact the performance and therefore it cannot be guaranteed.

Question 2

2. Which process connections are available?

Accepted Answer

The LW2720 and the LW2120 have the same threads and process connection. For the LW2720 with sanitary approvals We offer adapters for all common hygienic process connections, such as tri-clamp, Varivent, or directly to weld fittings. For the LW2120 we also have mounting bracket E33706 for mounting above open or plastic tanks. The adapters can be found under accessories.

Question 3

3. Can the LW2 radar sensors measure bulk solids?

Accepted Answer

The LW2xxx sensors are designed primarily for liquid media, but certain bulk media may be detected depending on their properties (conical heaps, grain size, dielectric constant, etc.). Be sure to test the sensor in these types of applications to determine effectiveness.

Question 4

4. Can the LW2 radar sensors measure oil-based media?

Accepted Answer

The medium dielectric constant should be ≥ 2. Mineral or ester oils typically have a lower dielectric constant and cannot be detected. Most edible oils can be detected. If unsure of the medium's dielectric constant, thoroughly test the sensor in the application.

Question 5

5. Are there any concerns using the LW2 radar sensors in CIP applications?

Accepted Answer

There are no concerns with the temperatures, chemicals and condensate occuring in CIP applications.

Question 6

6. Can multiple devices be used in the same tank?

Accepted Answer

Yes, multiple sensors can be used in the same tank, for example, for redundant systems. There is no minimum distance and no interference concerns.

Question 7

7. What are the mounting requirements?

Accepted Answer

Refer to the Installation guidelines for details. The device should be mounted so that no objects such as heating coils, spray-balls, ladders and agitators are in the radar signal path. Mount the unit vertically (90°) to ensure a good echo from the medium surface.

Question 8

8. Do the LW2 radar sensors work with foamy media?

Accepted Answer

It depends on the density and the amount of foam. The sensor can easily look through dry foam which includes lots of air. Thick, wet foam can affect the sensors performance or be seen as level.

Question 9

9. Is the radiation emitted from the LW dangerous?

Accepted Answer

No. The maximum output power is 3 dBm (2 mW) and is very low compared to the radiation emission of consumer electronics such as Bluetooth™, wireless LAN in laptops, mobile phones, etc.

Question 10

10. If not dangerous, can the LW2 radar sensors be used outside of metal or concrete tanks?

Accepted Answer

Yes, the LW2120 can be used above open or plastic tanks. In these cases, the radio approval requires use of antenna extension E33705.
No, the LW2720 cannot be used above open or plastic tanks. The radio approval only allows installation in closed metal or concrete tanks. The sensor only has radio approvals that allow it to be used inside of tanks. The sensor can be used in non-metallic tanks, you need to make sure objects outside the tank do not interfere with the signal beam, and there may be deterioration of the signal caused by electromagnetic interference from other devices (see Operating Instructions, Section 6.3)

LW Radar level sensor: FAQs