Our systems offer real time levels and anti-tamper/counter terror features such as instant transmit on attempted tamper, permitting abstraction to be instantly halted and the incident investigated.
Radio Data Networks offer a choice of single and dual channel borehole transmitters that can operate with either SDI-12, 4-20mA or voltage transducers (0-2V or 0-5V).
In the case of SDI-12 these units are able to read both the depth and also the temperature of the water making them perfect for geothermal and heat pump applications, and can communicate via gateways over the TETRA, LAN or IP networks as part of an IoT network.
With 4-20mA these units are often used where the level is to be processed and/or displayed more locally, typically via one of RDN’s Gateways as an identical 4-20mA signal.
Boreholes are created and monitored for many reasons. Globally there is estimated to be over 10-million boreholes. Boreholes can vary in depth from just a few meters (< 6 feet) to over 1km (600 yards), similarly the can vary in diameter from a little as 12mm (0.5in) to up to 150mm (6in), above which the name generally changes to a well or adit.
Traditionally boreholes were sunk to extract water for drinking and irrigation, however nowadays there are many other types and reasons for borehole drilling ranging form heat pumps through to saline intrusion monitoring.
What is often forgotten is that a borehole is like an open wound through which contamination can accidentally or deliberately enter. Further, boreholes pass through various strata and over-pumping from one strata can cause unwanted contamination from another. A typical example is where there is a saline strata above a potable strata separated by semi-permeable media.
Boreholes are traditionally monitored using a “dip tape”. This simply is a rope or stiff wire assembly with two conductors at the end that are lowered down the borehole until they touch the water. In simplistic terms a sounder and battery are connected in series with the circuit and when the end of the rope hits the water the length of rope is measured to give the depth.
Manual measurement is just a snapshot in time and when a water utility owns thousands of boreholes it can be very time consuming to visit each location. However more importantly the readings obtained will not be time correlated and further in the intervening days or weeks there is no knowing what is happening with the borehole.
Electronic instruments such as hydrostatic pressure transducers and data loggers have been used in a number of locations to record borehole depth. However, again this is not real-time and offers no protection against terror attack, over abstraction or over pumping.
In this modern age of control and terror threats, it is desirable to monitor boreholes in real-time, with regular depth, optionally temperature measurements but most importantly instant messages in the event of tamper.
We offer a wide range of solutions that support both Hydrostatic Pressure (Depth) Gauge and Absolute sensors of the 0-2.5V, 4-20mA or SDI-12 types. With analogue we offer the choice of 10-bit or 16-bit analogue to digital conversion.
Systems can be battery operated for up to a decade and sampling and reporting rates can be as frequent as every 5-minutes and with the option of instant alarm generation on tamper.
Data can be transported securely over licenced radio spectrum, Tetra, DMR or PMR and delivered in either electronic or analogue format (or both) to a single or multiple remote locations. Data can be presented in any file format and can be integrated in the case of Tetra and DMR to send out automatic warnings to key staff over the networks.
Instant Tamper Alerts! Unlike cellular that can take minutes to wake up and send a message, our telemetry systems do not require cellular coverage and can wakeup and send a distress message in under a second. Further, they do not require connection to the internet making them 100% cyber secure and robust.