Telemetry System for Torque Acquisition in Explosion Protected Zones

Manner Sensortelemetrie developed a Sensortelemetry system especially for 'explosion protected zone' applications to acquire process data from a rotating part. Online data acquisition of viscosity (on the basis of torque and rotational speed measurement) for chemical reactions is possible. Other applications include in-situ temperature acquisition in mixer or rotary kilns.

The system can be applied retrospectively to an existing installation. Sensors for temperature (e.g. RTD), viscosity (e.g. strain gage) or other sensors for chemical reactions can be inputs to the sensor signal amplifier. In addition to the monitoring application it is possible to integrate the sensor data into a control system. Therefore an oven temperature control system can be integrated with an online viscosity data acquisition system.

The system consists of an amplifier module at the rotor, a pick up and an evaluation unit. The distance between the process and the evaluation unit can be up to 100 m. The amplifier and the sensors are mounted on the rotating part with the electronics integrated into an induction loop which is formed as a split ring for easy-mounting.

The output signal is 0(4) to 20 mA or 0 to ±10 V.

With the Manner patented sensor telemetry technique there is no battery on the rotating part and the power and signal transmission are contactless. The system is absolutely maintenance-free and is powered with 24 VDC or 230 VAC to the evaluation unit. The explosion protection range is up to ATEX Exib IIC T4.