Wohler Combustion Analyzers
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Replaced by Wohler A 450 8389
Wohler Combustion Analyzers
Wohler USA is the American arm of the well-known and respected international Wohler Brand. Based in and developed in Germany, Wohler is a market leader in combustion analysis technology. Sadly, Wohler is lesser-known in the United States, which is a shame considering that they offer superior combustion testing equipment at the same prices as some better-known competitors. One potential reason for this is that they make a technically advanced product that might be intimidating at first glance. This is ultimately a benefit to the technician however, as once you get a feel for this equipment, the obvious superiority of Wohler analyzers becomes clear. In this article, we'll make the line of Wohler Combustion Analyzers easier to understand and point out all of the substantial benefits of owning one. Let's get started.
Wohler Analyzer Models and Kit Types
The Wohler Analyzer line comes in two distinct base model types that each is available in a variety of kits. The first model in the line is the Wohler A 450 Flue Gas Analyzer. This is the so-called light commercial entry-level model (although, as we'll see shortly, the CO range on it blows the competitors out of the water). The second analyzer in the line is the full-scale industrial model - the Wohler A 550 Flue Gas Analyzer. Let's start by taking an in-depth look at the A 450 and its various kit configurations, with some application notes, and then after that, we'll dive into the A 550 (which you'll see soon is an absolute beast of a combustion tool).
The Wohler A 450 Flue Gas Analyzer
The thing you're going to notice right off the bat with the A 450 is the look of the meter. The physical platform itself already sets this analyzer apart from the competition, and the price point is the same or better than comparable tools for light commercial combustion testing. The 5" high-def color display on this unit looks pretty much just like a tablet computer. And essentially, it is. The obvious advantage of this is that ALL measurement parameters are displayed at a glance. Virtually no other competing device lets you read everything on a single screen at one time. It might seem like a small thing to have to scroll to get your readings, but in the hustle and bustle of daily work, we can assure you that this is not the case. You shouldn't underestimate the benefit in terms of ease of use in having everything displayed simultaneously onscreen. The screen has a hinged, ruggedized plastic cover that you can shut when not in use to protect the screen from accumulating any damage.
The interface itself is also a touchscreen, drawing tablet comparisons again. The navigation is easy and intuitive if you've ever used a smartphone (which is most of us these days). Simply tap the icon you want to open the corresponding menu. In addition to the user interface, the Wohler A450 offers other "smart' features that device users have come to love. All measurements can be sent wirelessly via Wifi to another smart device (tablet or phone) that uses either the Android or iOs operating systems equipped with the free Wohler combustion app. You can view the measurements in the free Wohler app in either numerical form or as a bar graph. All of the data you collect can be stored on the device and then sent in attractive reports via email to customers or a supervisor. You can also use the Wohler printer to print out classic-style paper reports right on the job.
How does the A 450 Wohler Analyzer work?
Let's do a quick rundown of how to operate the analyzer so you have a decent idea of what you're getting into. You want to turn the analyzer on outdoors in as fresh air as possible. This kicks off the automatic calibration process, which will take about 60 seconds to complete. As the calibration is running, you'll see 5 icons appear that you can choose from. They are: Restart, to begin the calibration over again; Diagnosis, for the analyzer to check its own level of functionality; Customers, which allows you to create new customer folders for storing test data and access current files; Data Exchange; for sending test results over Bluetooth or via USB; and menu, which will give you the main menu for combustion testing.
From the menu, you can select "readings" and this will take you to the screen we mentioned earlier that displays all the values simultaneously. It's an extensive list, but we'll list them here for reference. The measurements and calculations displayed include: Oxygen content, Carbon dioxide content, Flue gas loss, Carbon monoxide diluted value, Carbon monoxide corrected (air-free), Condensate quantity in condensing conditions, Nitrogen oxide, Nitrogen oxide corrected (air-free), Dew Point, Toxication index CO/CO2, Ambient Temperature, Flue Gas Temperature, Efficiency and losses calculated in accordance to EN standards, Efficiency and losses in accordance to ASME standards, Efficiency and losses in accordance to European standards (0.0 to 120%), Differential Pressure, Theoretical air/ excess air, Excess air.
To begin your testing, select the fuel button from the menu. Here you'll have a series of predefined fuel options to choose from, plus 4 slots for user-defined fuels. The preloaded fuels include: Natural gas, Fuel Oil 2, Fuel Oil 4, Fuel Oil 6, Bio-fuel, LPG, Propane, Kerosene, Digester Gas, Coal, Wood, and Pellets.
On the screen, for any particular reading, you can see bar graph representations for the parameter. You can start and stop the measurements with a simple play and pause system that you'll recognize again from using any standard smart device.
A Few Notes on Parameters and Kits
Before moving on to the A 550, we should just mention the ranges for various combustion parameters since this will help you to make your buying decision. The A 450's ranges are impressively wide for an analyzer in its cost bracket.
The CO sensor goes all the way up to 10,000 ppm, which is truly excellent for the price point. That's plenty good for anything but heavy commercial work. Additionally, the NO sensor reads up to 3,000 ppm.
The Wohler A 550 Flue Gas Analyzer
This analyzer is one of the toughest you're likely to come across and is designed specifically for work in industrial applications. You can think of it as a beefed-up version of the A 450, since the operation is pretty similar, only the measurement parameters are much wider, and the physical construction is way more rugged. Wohler phrases this as "tough as cast iron but easy to use as a smartphone". We think that's an excellent description. Operationally, it works just like the A 450 we've just described.
Physically, the platform itself resembles the last analyzer but is noticeably larger in display size. The high-def touchscreen on this model is a full 7" across. The flue probe features an in-stack Sinter filter to protect the analyzer from heavy dust loads you might find on the industrial job site. This filter removes any dust from the probe larger than 20 microns.
As far as measurement options, the A 550 reads your standard parameters of Oxygen and Carbon Monoxide (with calculated CO2), but also reads NO, NO2, and SO2. This means additionally that you can check for NOx and SOx values, but these are adversely affected by moisture that gets into the sample gas. Wohler combats this with a probe attached Peltier cooler that is continuously cooled by a separate rechargeable battery. This prevents condensation in the sample and gives you accurate readings every time. The sampling pump is also higher power for taking differential pressures up to 300 mbar.