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 […]
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Shedding 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 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 […]
Read PostTemperature Sensor Curve ID Numbers
Need help figuring out what type sensor you need for your automation system? This handy temperature curve chart might help. If not, give Kele a call! Sensor Type Temperature Sensor Description Typical Sensor User 3 10,000Ω @ 77°F, Type III material AET, American Automatrix, Andover, Carrier, Delta, Invensys, Teletrol, York 21 2252Ω @ […]
Read PostTime Delay Relay Functions Explained
Understanding the differences between various time delay relay operations such as On-Delay or Interval can be a bit confusing. These simple diagrams may make it easier to visualize what’s happening during the timer operation(s). At Kele, our goal is to make product selection and usage as easy as […]
Read PostExtend Your Reach with the ST-A Series by Precon
Kele’s Precon brand has a sensor solution for ALL your application needs, even the odd ones! Job site situation #1: You need a temperature sensor for your tank or cooling tower sump, but they don’t make one long enough. Special ordering one seems daunting. What if it doesn’t work out and you can’t send it back? […]
Read PostGreen Buildings need Clean Electrical Power for Sustainability
Major changes are taking place in the United States as we all move forward to reduced energy consumption and utilization of renewable energy sources in our homes, offices, campus environments, and factories. As new technology becomes available with ever increasing returns on investment many owners are ready to become part of the “Green Movement” that […]
Read PostTHE (RS-485 Network) TERMINATOR Or The Dance of the Data Pulses
If you’re involved with building automation systems you know (unless you’ve been living under a rock like the guy in that insurance commercial) that the modern trend is to connect all your building controls together on networks. Networks make it easy to add or move control nodes as your building control needs change since the […]
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