NOx abatement part II- Why use NOXGUARD?


NOx Abatement

Continuing from our last blog post, which you can read here , we talked about what NOx is, why we need to control it and how each of us can help control it. As we all now know, industrial plants, and more specifically electrical power plants, generate a great deal of NOx , which contaminates our environment. There are several ways for these industrial plants to control their emissions, two of the ways are through the use of Selective Catalytic and Non Catalytic Reduction systems with a Urea Liquor mix (Diesel Exhaust Fluid at different concentrations). Different fuels need different NOx abatement techniques, for those that use Urea, we are here to shed some light.


What we know about SCR


  1. It is one of the most effective NOx abatement systems
  2. Has a higher initial cost
  3. Can achieve up to 94% DRE


What we know about SNCR

  1. Based on ionizing the Ammonia or Urea instead of using a catalyst
  2. Either urea or ammonia must be injected within a boiler or ducts where temperature is between 900 and 1100 degrees Celsius.
  3. Temperature has to be right, or ammonia will “slip through” or more NOx will be created than is reduced
  4. Can achieve up to 70% DRE


What is the difference between agricultural grade urea and NOXGUARD Industrial grade urea ( urea used for NOx control)?

Urea used for fertilizer is handled and stored differently than urea made into NOx control solution. High Quality dry or solution urea used in NOx control is kept in dedicated clean storage to ensure purity for both SCR and SNCR systems.


Why would a straight injection SNCR system need highly pure water or urea?

We know that the SCR system needs high purity water and urea, given the sensitivity of the catalyst bed. For the SNCR system if there happens to be any impurities in the solution they could be caked onto the nozzles and equipment in the exhaust zone. This can lead to clogging and could ultimately lead to costly damages in SNCR systems.


Why choose NOXGUARD for NOx Abatement?

NOXGUARD has spent many years on the technical process of making urea solution for NOx control in the automotive industry. Impure water and Ag-grade urea will not suffice in making urea NOx control solution. The water source must be removed of all impurities and de-ionized; if this is not done pollutants can damage the NOx control system. Fertilizer/feed grade urea can have contaminants, which will damage SNCR or SCR systems.


1.Nitrogen Oxides (NOx) Why and How they are Controlled

SCR sensors for Adblue/Diesel Exhaust Fluid – guest blogger

We are happy to kick off our guest blogger series, something that has been on our radar for sometime.  We feel it is important to shine the light on our industry friends where benefits may be of value to you.


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In the spirt of blogging, loving to share content; we are opening our blog here at Transliquid Technologies to guest bloggers. We are happy to shine the light on our friends at Gentech, a UK based company focusing on SCR sensors in Europe for the AdBlue/DEF market.  What is interesting and unique about Gentech is their innovation and approach at an emerging market.

Ms. O’Rorke contacted us a little while back and we began the conversation on their new products for the AdBlue European market.  Ms. O’Rorke handles Public Relations and was graceful enough to engage in a Q/A session with us here at Transliquid.


Transliquid – Thank you for joining us, first of all.  It’s good to have you on our blog.

Gentech-  Thank you, this is a great concept.

Transliquid– Can you explain to us all, what these SCR sensors are?

Gentech-  The sensors are aimed at detecting the presence of and measuring the level and temperature of, AdBlue – known as a Diesel Emission Fluid (DEF) in North America -the exhaust after-treatment method used with diesel engines to reduce NOx. emissions.

Transliquid –  Where are these sensors fitted?

Gentech- Well, that is where we shine.  These sensors are for the actual AdBlue/DEF tanks on buses and trucks.  We partner with original equipment manufacturers and component suppliers to design and deliver these unique solutions. Later this year we will be launching a combined temperature/level and quality SCR sensor for retrofitting. I’ll let you know when that is ready.

Transliquid –  I understand that you have also managed to included heating elements into Adblue/DEF tanks.  Can you expand on this a bit?

Gentech-  Yes, we have added an option for a heating element in case of AdBlue/DEF freezing in cold environments, plus we can furnish an 80 or 100 micron filter on the suction line to prevent unwanted particles being fed into the SCR system.  This also comes with incorporated compact connector for quick assembly to the wiring harness.

Transliquid – So let’s have a look at these sensors.

Truck & Bus dv2.indd






Transliquid-  Let’s talk about the integrity and quality of AdBlue/DEF.

Gentech- I am glad you brought this up because our customers have pushed to create the following.  We have an optional integrated quality sensor detects when non-DEF/AdBlue fluids are added to the tank. This sensor is a solid state electronic device that works by detecting differences in the properties of the medium in the Adblue tank. The device will alert when filling with Adblue/DEF tank with unauthorised liquid (leading to out of specification exhaust emissions) as well as aiding in the prevention of damage to SCR system components.

Transliquid- Ok so looking at the pictures brings me to my next question, how do secure/fit these sensors for the Adblue/DEF tank?

Gentech– We often work in conjuction with tank manufacturers to facilitate the engineering of suitable systems and cut costs in the long run. Bayonet and flange fit mounting of the sensor assembly into the tank is most common, but we have rubber seal options which can simplify tank designs.








Transliquid- Very good. Last, I got the opportunity to read your case study with one of the largest bus fleet manufacturers.  I’ll let you expand on that.

Gentech- Yes we worked together with this manufacturer at developing a solution to measure level and temperature for their buses.  The AdBlue/DEF liquid had to be at -37 after motor has been running for 20 minutes.  What we did was a creation of a level sensor that operated down to a minimum of 8% tank capacity, this was to ensure that the dosing system never ran empty.  The temperature sensor was capable to operate in the range of -40 & +70 with a 80 micron filter.  Last, we included a heating tube that was connected to the vehicle’s heating and colling system.  What we came up was a level sensor based on zero maintenance, robust plastic and stainless steel construction, with a super easy quarter turn fitting.



I’d like to take the opportunity to thank Mr. Imogen for the content and pictures used on this blog post. It truly been a pleasure to highlight Gentech, a leader in liquid level sensors, position sensors, flow switches, and optical sensors.

As always, we alway love to hear your comments so sound off your initial comments.  Would you like to see this technology up and close here in the US?

If you are interested in being our next guest blogger, feel free to contact us. 

Thank you for reading our Blog.

Transliquid Technologies – not only thinking different, but doing business different.  Call us today at 281-377-5845