There are potential failure mechanisms such as a blocked pipe or locked motor that would not be detected by the current switch.The detector was wired to switch power to the coil of a small relay whose contacts were wired to the digital input of the ADU. The detector provides an on-off solid state output that indicates if there is a current of more than 0.5AAc flowing in the power lead. A simple current presence detector from Ohio Semitronics was placed on one of the motor power leads. The first requirement is to monitor for the presence of current to indicate the motor is running. Radon removal is achieved by using a small motor to power a blower that maintains a negative pressure within the enclosed space.The monitoring requirements dictated that two different aspects of the radon mitigation system be monitored: The ADU is packaged in a rugged, IP66 enclosure which allowed it to be directly mounted to an inside wall close to the system without any additional protection. The ADU has been designed to minimize power consumption so it can operate for years on its internal D size Lithium battery or operate off external power with the battery as a backup. It has 2 analog inputs for voltage or 4-20mA output sensors and 3 digital inputs for switches or dry contacts. It utilizes an internal 3G cell modem to send data via FTP and alerts via SMS messages. One product that meets these requirements is the ADU-500, a very low power, wireless remote telemetry unit (RTU) with data logging and alarming features. Also, it was strongly desired that it be able to continue to operate on battery power in case of a power outage. One of the key requirements of the system is that it be able to provide near real-time alerts for any failures in the radon mitigation system without needing a connection to the homeowner’s network. This apps note provides an overview of one of these monitoring systems. At CAS, we have provided data logging/monitoring systems to several different contractors tasked with installing and maintaining residential radon mitigation systems. While this system provides an effective means to reduce the concentration of radon inside the structure to acceptable levels, a key is to monitor the system operation to make sure it is doing its job. The most common solution is to put in place a radon mitigation system consisting of a vent pipe and blower to pull air from under the slab under the house and exhaust it outside. In the US, the EPA recommends that corrective action be taken if the level in the air is found to be above 4 picocuries per liter (pCi/L). It is highly recommended that, in areas that are known to have elevated Radon levels in the soil, any homes be tested for internal Radon levels. The problem is that it can leak up from the ground and accumulate in buildings there is clear evidence that breathing air with high concentrations of radon gas can cause lung cancer. It results as part of the radioactive decay chain of uranium and thorium in the earth’s crust. Radon is a colorless, odorless radioactive gas that is present in trace amounts in the environment. ADU-500 Offers Cost-Effective, Wireless Solutions to Contractors
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