The MQ 0107 bimetallic instrument is intended especially for thermal monitoring of transformers, cables, etc. due to its slow reaction to current changes. It indicates mean RMS current value during the measuring period of the instrument. The instrument does not react to short current pulses essentially. Maximum mean value in a response time period is indicated by the red slave pointer. The latter can be reset or set to zero by means of a knob which can be sealed.
MQ 0107 is the same as the one on the photo, except its front frame is 144x144 mm. Special instrument design enables quick replacement of the scale both in case of a new or an already used instrument. This is especially suitable for instruments which are connected to current transformers.
The exchangeable scale has a number of advantages: