A 4-20 mA control signal is one of the signals of choice in the Building Automation industry as well as in the Industrial Process arena. Most of the various transmitters and output devices available from Kele utilize a 4-20 mA input or output signal. In large commercial buildings, expansive factories, multi-building university campuses and other […]
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UFT Helpful Application Notes
Kele designed the Universal Flow Transmitter (UFT) for use with Badger/Data Industrial flow sensors, but in reality the UFT can be used with many other makes and models of flow sensors if their signal outputs are compatible with the UFT signal input. Kele frequently gets asked the question “will this Model XYZ flow sensor work […]
Read PostDivide & Conquer Those Hard-to-Read Flow Meter Pulses
Some HVAC applications require reading and totalizing pulses from flow meters. This sounds simple enough, just take the pulse output from the flow meter, connect it to a Binary Input (BI) on your controller, and set up the program logic to count pulses coming in on the BI. What could go wrong? Unfortunately things are […]
Read PostControls and Cables in Environmental Air Handling Spaces, Ducts, and Chases
First, let’s discuss controls and their enclosures in air handling spaces, ducts, and plenums. Many times, we have to install items in these spaces and it’s important to consider that anything we put in there should either be non-combustible (metal) or else be listed under UL 2043 for use in air handling spaces. The NEC […]
Read Post“Currently” Playing: Connecting A 4-20 mA Constant-Current Signal To Multiple Loads
One of the most popular and long-lived methods for transmitting analog control signals in the HVAC and industrial control worlds is the “constant-current signal loop.” In this scheme, the value of the current flowing in the circuit is the control variable, rather than any voltages that may appear at different points in the circuit. The […]
Read PostShedding Some Light On 0-10V Dimmable Lighting Fixtures
A very popular way to decrease energy usage these days is to use dimmable lighting fixtures and throttle back on the electrical lighting when outdoor light is available through windows or skylights. A light sensor such as the Kele MK7 family can feed light level information into a building automation system (BAS). The BAS […]
Read PostNetworking 101: BAS Network Cabling
The various devices comprising a building automation network are either connected by cables or talk wirelessly to each other, or possibly a combination of both. In Networking 101, we are going to concentrate on network devices connected by cables. Let’s take a look at the different types of network cables typically encountered in building automation […]
Read PostConnecting A Voltage-Output Signal Source To Multiple Loads
The Tech Support crew here at Kele frequently gets quizzed by customers who have a voltage-output signal source which must drive multiple voltage-input loads. Requests for “voltage signal replicators” come in frequently. Sometimes extra hardware is needed, but sometimes it isn’t! So we thought it might be a good idea to write an article addressing […]
Read Post47 Ways to Wire Your Power Meter Wrong
Some of you might remember that back in 1975 Paul Simon had a hit song entitled “50 Ways to Leave Your Lover.” Well, coming in a close second are the number of ways (47) that you can wire a 3-phase power meter incorrectly! In this article we’ll briefly discuss why there are so many ways […]
Read PostHot and Steamy Pig Tails! How to Measure the Pressure of Steam Without Breaking Your Pressure Transmitter
So, in checking the specs, the PTX1-06, can read pressure up to 200 degrees Fahrenheit, like most pressure transmitters in the marketplace. But, steam is steam at 212 degrees Fahrenheit. How’s that going to work? This little piggy says to put a copper extender on a pig tail, and shoot the steam to the side […]
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