Modules dedicated to cathodic protection

INVENTIA, in close cooperation with SPECKOR Maciej Malicki, has developed and introduced two new telemetry modules MT-652 and MT-651, designed to monitor parameters and control the cathodic protection installations of pipelines, tanks and other metal structures buried in the ground or submerged in water. Relying on many years of experience in various telemetry solutions and extensive knowledge of cathodic protection, the modules meet the needs of integrators and users of this type of installations.

Both modules are encapsulated in a compact fibreglassreinforced plastic housing that provides IP65 protection. They can perform measurements through two separate and independently working analogue input groups.

Each of these groups includes:

  • two configurable analogue inputs with a range of ±10 V or ±100 V and a measurement resolution of 1 mV
  • one analogue input with a range of ±100 mV and a resolution of 1 µV

This means that each telemetry module offers up to 6 measuring channels, which allows, for example, simultaneous monitoring of 2 cathodic protection rectifiers. In addition to the described analogue inputs, the terminal has two binary inputs and two binary outputs. These resources can be used to signal any state, e.g. cabinet door opening. The purpose of binary outputs is to accomplish typical tasks, i.e. measuring the IR free potential of the structureor coupon, manual off/on switching of any circuit or synchronized controlling the output according to a predefined time schedule.

Both the MT-652 and the MT-651 are equipped with an internal GPS receiver, which is an extremely important feature in this case. In addition to geo positioning, it is used for precise device time synchronization, based on which sequential measurements are made, and then marked with an individual time stamp.

Five signalling LEDs are located on the front panel of the module. They are used by the module to present the current status of the GSM modem, the GPS receiver, and the status of the inputs and outputs.

This information may be useful while verifying the current status of the device or solving problems related to its current operation. Input and output connectors, to which signals from the field may be connected, are located on the front side of the MT-652 module. To ease the installation of the module in a CP test post, where the available mounting space is very limited, the MT-651 has the signal connectors moved to the lower wall of the unit, providing a hermetic 19-pin connector. At the top of the device there are two SMA connectors, one for a GSM antenna and the other for a GPS antenna. In the MT-651 telemetry module, the GPS antenna is placed directly inside the housing.

These telemetry modules can be powered by an external voltage of 7 – 30 VDC. Additionally, the MT-652 has an internal 2.6 Ah Li-Ion rechargeable battery of 3.7 V nominal voltage which ensures uninterrupted operation in case of the mains power failure. The MT-651 features the main powering function by a 17.4 Ah internal battery pack of 10.8 V nominal voltage. Therefore this unit is predestined for self-operation on an internal battery pack in locations where no external fixed power supply is available.

It is standard for new solutions offered by INVENTIA to support two SIM cards and the same is the case with the modules mentioned above. This ensures high reliability in the implementation of GPRS packet transmission. When the device is not logged on using the main SIM card, it will try to switch to a the backup SIM to successfully establish a data connection.

The MT-652 and MT-651 modules, as the entire family of telemetry devices we offer, are supported by the free MTManager configuration environment and MTData Provider communication software. The software communicates with the devices and provides current data through the standard OPC interface. In the case of historical data, it is possible to save them in relational SQL databases using ODBC sources or save directly the received data as CSV files. Thus, we provide designers, integrators, and system users a wide range of integration capabilities with supervisory systems.

Modules dedicated to cathodic protection