Rainwater Harvesting

Map showing the extent of drought in the continental United States as of 27 October 2020At the time of this writing, the American Intermountain/Southwest is in the grip of an extensive drought. 100% of the population of the Four-Corners states (Utah, Colorado, New Mexico, and Arizona) and Nevada are experiencing D1 or worse drought, which makes what little water there is that much more precious. And while use of the water in rivers, reservoirs, and aquifers is subject to highly negotiated rights, and the use of wells is dependent on the location of the wells, there is a source of water that is gaining in popularity, despite its irregularity: rainwater.

Liquid Level Sensor Technology Decision Tree

illuminated exclamation mark in a field of dark question marksHere it is, the week after Christmas, and you still haven’t gotten that special something for your process system. A liquid level sensor would be great, but you just aren’t sure what type of sensor would be best for you, uh, your process system.

Well, APG is here to help. No, we didn’t put together a comprehensive gift guide for your process system. But, we did manage to assemble this handy-dandy Liquid Level Sensor Technology Decision Tree. Answering each of these questions will help you identify the liquid level sensor technology that best fits the needs of your system.

The Best Level Sensor For Deep Water Wells

submersible pressure transducer iconDrought conditions in the western U.S. are making water well monitoring a priority. It is now more important than ever to track this precious resource.

Monitoring water well levels can be challenging. Wells are often in remote areas where power is not available. Furthermore, while some wells are only 10 to 60 feet, there are many that are hundreds of feet deep. This eliminates many sensor choices.

But not all.

For water well level monitoring, and especially for the deep wells, we recommend our PT-500 submersible pressure transducers. These sensors work great for deep wells for a variety of reasons. They are simple and reliable, easy to install, and don’t require much power.

Interface Level Measurement

Liquid interface level measurements are some of the hardest applications around.Many liquids used in processing applications will separate from each other when allowed to settle. They do this either because they are completely immiscible, or they simply have different densities. When a liquid level of each is required, you need a dual level, or an interface level sensor.

Walt Boyes, Editor in Chief at Control and Control Global magazines said that, “interface level measurement is the hardest level measurement application I know of.”

He’s not kidding. Single liquid level sensing applications can...

Ultrasonic Sensor Functionality in Lift Stations

ultrasonic sensors bounce sound waves off of target mediaIn the last blog post in our series on sensors in lift stations, we discussed the benefits and challenges of using a submersible pressure transducer for continuous level measurement. As a reminder, continuous level measurement provides large economic benefits in energy savings when using pumps with variable speed motors.

Ultrasonic sensors are another common pick for continuous level measurement in lift stations. They function by sending pulses of high frequency sound waves. When the sound waves bounce off...


Storage tanks typically need redundant level measurement to prevent spills and potential disasterTaking redundant level measurements is an important precautionary tactic to prevent spills in the event of sensor failure. While we expect our sensors to last a long time, they will eventually fail – as will any sensor from any manufacturer.

Failure doesn’t necessarily mean the sensor is completely broken. It may be that the sensor needs recalibration, or that environmental factors have caused inaccurate readings. Each sensor is designed with features to avoid this, but having another sensor in place, preferably of another type/technology, can ensure that sensor failure does not lead to disaster.

Sensors For Lift Stations

The wet well of a sanitary lift station.Sensors play a key role in pump control for Lift stations. Without good working sensors, lift stations can overflow, pumps can be ruined, and power can be wasted. Over the next few weeks we will be providing a series of posts that cover the various types of sensors that can be used for duplex and simplex pump control, override sensors to provide back-up pump control, and some of the benefits of continuous level measurement vs. point level sensing.