Posts Tagged ‘differential pressure’
Thanks to our friends at E & H for the outstanding video on how and when to use a pitot tube and a differential pressure transmitter to measure flow
This video from our friends at E & H does a great job of showing how to create differential pressure to measure flow
Walt from Control Global does a great job explaining how differential pressure measurement works. Stromquist & Company can help you with your flow needs.
You can use the great differential pressure transmitters you buy at Stromquist & Company to measure tank levels.
Check out this demo to see how differential pressure transimitters can be used to measure flow. For more information contact your friends at Stromquist & Company
Differential Pressure combined with and inline flow element is a very popular way to measure flow. Stromquist & Company can handle your flow measurement needs. A great application is measuring gas. It is critical to have a good understanding of what is meant by “high and low pressure ports”.
There is nothing more frustrating than trying to start your boiler or burner; you hear the fan start, patiently wait for the sound of your ignition transformer to kick in and the roar of your burner light off, and nothing happens. The most likely cause of this problem is that your combustion air flow switch is not making.
The airflow switch is a burner/boiler safety device that proves (makes sure) that the combustion blower is running and providing the minimum amount of air pressure for safe light off, before we try to light off the burner. The airflow switch is wired in the preignition interlock circuit of a flame safeguard control. The sequence in which things happen is critical for safety in a combustion control system. The airflow switch being in the preignition circuit tells us that this switch must be made before the sequence can continue to ignition,which is why the combustion blower comes on and nothing else happens when the switch is not made. It could be very dangerous to open our main gas valves, allowing gas into the combustion chamber without having the necessary air flow that the combustion blower provides for proper and safe operation.
You can see “How to troubleshoot the combustion airflow switch” on Stromquist TV. Matt walks us through the steps of troubleshooting the airflow switch which include: 1) making sure the combustion blower is turning in the correct direction (you might laugh but it is one of the biggest causes of airflow switch problems our tech people get at Stromquist) 2) make sure your hook up tubes are the right size and not clogged 3) make sure your differential pressure is set properly. We like to use the Testo 510 ( available at Stromquist & Company) to set up our switches.
Differential pressure is an interesting subject in its own right. Not only is it used to prove things like air or water flow, but we also use it to measure flow. Put a know restriction in a pipe with flow.which creates a pressure drop, add an differential flow transmitter like the Honeywell STD900 or STD3000 and you have a very accurate method of measuring flow.
For more information on using DP ( differential pressure) to measure flow check out the following videos:
Meaning of DP transmitter high and low pressure ports
Back to Basics: DP Flow Measurement
If you are a Stromquist customer or are in GA or FL, call your Stromquist rep for help with your combustion and flow needs. All others, please refer to one of our affiliates at the Controls Group North America site to find a distributor in your area.
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