Category: Technical Reference
A Flow Meter with Features That Raise the Bar, Not the Price
Are you choosing the correct flow meter?
Most buildings require some aspect of water flow and, often, BTU measurement. Several different flow sensor techniques can be used depending on need. These include water type, application, accuracy, required measurement, installation challenges, and cost effectiveness. Below is a table to help you determine which technique, product, and installation is most relevant for your project. […]
Read PostGuidelines for Replacement of Old Fire and Smoke Actuators
For Belimo combination fire/smoke damper actuators intended for installation in accordance with National Protection Association Standard for Installation of Air Conditioning and Ventilating Systems, NFPA 90A, damper actuators must meet the construction and performance requirements in UL555: Standard for Fire Dampers and UL555S: Standard for Smoke Dampers. Often, customers replace damper actuators for varying reasons […]
Read PostApplication Tips: Determining Air Flow in Cubic Ft./ Min
To calculate Air Flow in Cubic Feet per Minute (CFM), determine the Flow Velocity in feet per minute, then multiply this figure by the Duct Cross Sectional Area. Air Flow in CFM (Q) = Flow Velocity in Feet Per Minute (V) x Duct Cross Sectional Area (A)
Read PostSelecting the Appropriate Pressure Transmitter
With so many choices, selecting a pressure transmitter can be a frustrating endeavor, but it doesn’t have to be. With a few simple steps, finding the right transmitter for your application can be considerably easier.
Read PostPanels 101: Designing and Building Control Panels
The most critical element that shapes a panel design project must be addressed at the very beginning of a project: where is the completed unit going to be installed? This very basic question dictates the type of protection the enclosure must provide to the equipment. The switchgear inside the enclosure must be protected from the […]
Read PostTech Talk: I need an explosion-proof control panel with a few pilot lights and…
Q: I’ve been buying explosion-proof enclosures and devices from Kele, and I must say that the Hazardous Locations section of your catalog is a gold mine of hard-to-find products! Now I need an explosion-proof control panel with a few pilot lights and externally operable selector switches mounted on the door of the panel. Can Kele help me with […]
Read PostTech Talk: Timing relays are confusing to me. Can you explain the difference between single-shot and interval timers? What happens if the output driving the relay changes state during a timing sequence?
When all of the possible combinations of timing states and initiating device transitions are considered, a stronger word than “confusing” may be in order! Below are some timing diagrams and sequences of operation in simple terms that may be of help. Since it is an electronic circuit that is energized rather than a coil, the […]
Read PostTech Talk: Air Capacity and Consumption – Choosing Electronic to Pneumatic Transducer
When it comes to selecting an electronic to pneumatic (E/P) transducer, the type of input and the pressure range of the output are the most common selection criteria considered. There are a couple of other specifications that are worth reviewing to select the best transducer for the job. These additional specifications are Air Consumption and […]
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