Resistance-dependent measurements

If a measured variable is determined directly based on the resistance value of an electrical component, the additional impedances within the measuring loop play a special role. This affects, for example, temperature measurements with platinum resistance detectors (Pt 100, Pt 1000) as well as strain gauges with two-wire technology. As a rule, MCR surge protection products contain impedances in the common mode paths. If the impedances are introduced into the circuit without recalibration, the measurement result will be falsified due to the change in the total impedance. Circuit versions without additional longitudinal resistances simplify the installation of surge protection in applications of this kind.

The more accurate measured values such as temperature or weight measurements need to be, the greater the number of conductors used for these measurements. In the case of 2- or 3-conductor measurement, inaccuracies may occur due to the cable lengths. With 4-conductor measurements, these errors are prevented by the measurement setup.

Use TERMITRAB complete to protect all four conductors against overvoltages with a single protective device – with an overall width of just 6 mm. The protective devices consist of a base element and plug. If maintenance is required, you can simply replace the plug during operation without affecting the measuring signal or requiring any wiring effort. Depending on your requirements, use fast Push-in connection technology or conventional screw connection. Thanks to visual monitoring, you can integrate up to 40 protective devices into the remote signaling system without additional outlay.