Articles

Frequently Asked Questions : PRODUCTS

FAQ : NRV radar

The NRV is a compact radar sensor that allows level measurement without immersion and without contact with liquids.

water cycle dam

What is the need for the NRV radar?

The NRV radar sensor radar sensor is used for level measurement of liquids, mainly water.

 

What type of installation does the NRV fit into?

NRV radar can be found in sewage systems, drinking water systems, waterways and sometimes in chemistry, especially in aqueous media containing ferric chloride.

Most of the time, the NRV is installed in lift stations, bar screens*, sand filters, water towers... It can also be used in the natural environment, to measure water levels, to monitor floods and low water levels.

 

*A bar screen is a system that filters waste from water (for sanitation or stormwater). An NRV radar placed in the screen system ensures that the screen is not blocked by waste: the water level on both sides of the screen is measured, and if they are uneven, it shows that the flow is blocked. The grate is then replaced automatically.

What are the competitive advantages of NRV PARATRONIC?

The main advantages of the NRV radar sensor are its low power consumption and its short warm-up time: 2s. With the adjustable smoothing time (to avoid errors due to wavelets for example), a measurement can be obtained in about 10 seconds.

Bellejouanne Water Treatment Plant

Why choose an NRV sensor instead of a piezometer?

There are several reasons why you may choose an NRV sensor rather than a piezometer probe :

 

  1. The NRV sensor is less prone to clogging than the piezometer probe.
  2. The NRV is an airborne sensor, so it is not submerged, which makes it less susceptible to environmental risks.
  3. When cleaning up water systems, the hydro-cleaner may break submerged sensors, but will not break an airborne sensor like the NRV.
  4. Finally, due to its plastic shell, the NRV is not sensitive to gases that may escape from the liquid being measured, such asH2S for example.

 

 

Installation of the NRV sensor

How to install the NRV?

The NRV radar sensor is very easy to install. It can be used as it comes from the factory, but we recommend that you set up the sensor to best suit your needs.

 

Setup is done with any computer, using our free HMI Sensors software, the ADP USB adapter and of course a connection cable. The HMI Sensors parameters are exportable, so you can create a library of parameters to reuse them from one sensor to another or keep them in case of NRV replacement (you will then just have to reinject them in the new sensor).

The sensor is supplied with 2m of cable, and an a mounting bracket can be added (optional).

 

You can do the installation yourself, but our teams are at your disposal if needed.

How do I feed the NRV?

Unlike sensors such as the RadiusUnlike sensors such as the Radius MAC RS4, the NRV radar sensor is not a stand-alone system: it is powered either by an external source or by the data acquisition system to which it will be connected: the PLC, the remote management system, the MACthe RS4the displays... It operates in a 4-20 mA loop.

 

Most of these data acquisition systems can be connected to a battery, so the NRV sensor is compatible with hard-to-reach sites that are not connected to the mains.

What kind of maintenance does the NRV require?

The NRV is virtually maintenance-free, except for cleaning the surface from time to time. This prevents dirt from accumulating, which could cause incorrect values.

 

Unlike sensors such as the RadiusUnlike sensors such as the Radius MAC RS4, the NRV radar sensor is not a stand-alone system: it is powered either by an external source or by the data acquisition system to which it will be connected: the PLC, the remote management system, the MACthe RS4the displays... It operates in a 4-20 mA loop.

 

What kind of information can the NRV give me?

The NRV radar sensor transmits a 4-20 mA signal over two wires, or an RS485 signal.

When the water level changes, the current between the two wires changes, which causes the output signal to vary. Through the displays or acquisitionwe can use this signal to deduce a height, a level or a drawdown (the drop in the water level of a well when it is being tapped).

water tower water cycle

What is the purpose of the data recorded by the NRV sensor?

This information will be used by the automation systems mainly to start up level control equipment: to fill a water tower or operate a lift station.

Once a high level is set in the acquisition, the NRV transmits meters, and the automation system will start or stop pumps according to the set levels.

 

In the field of drinking water, for example on a water tower or a reservoir, you can measure the water level and define thresholds so that when the water reaches the low threshold, the automatism triggers the pumps that will fill the reservoir in order to guarantee the availability of water for its dedicated use.

 

What are the limitations of the NRV sensor?

The NRV radar sensor is configured on three levels: 3, 8 or 12. The maximum air draught that can be measured is therefore 12m. Beyond this, the following must be adopted another solution.

 

Be aware, however, that the NRV radar has a dead zone of 300mm, meaning that it is impossible to measure the actual water level if it is less than 300mm from the sensor.

What is the guarantee of the NRV radar?

The NRV radar sensor is guaranteed for 2 years and includes the risk of lightning strikes, without the need to purchase a lightning arrester (integrated 2KV lightning protection).

A lightning arrester can still be added before the acquisition input, to protect the acquisition system from the risk of surges due to lightning strikes.

 

Is NRV produced in France?

Like almost all our products, the NRV radar sensor is handmade in our factory in Reyrieux, Ain, France.

 

Do you have any further questions?

Didn't our FAQ answer all your questions? Do not hesitate to contact us for more information.

 

 

 

 

Share on social networks: