EM-72 Control Unit

This vibration monitoring system consists of accelerometer EM-82 and of combined transducer supply and monitor unit EM-72. Accelerometer is built to a light alloy housing IP67 and the monitoring unit is delivered in polycarbonat housing with protection class IP65.
The structure of EM-82 is so-called capacitive single chip transducer. This technique facilitates features as good long-term repeatability, accuracy, shock resistance, good temperature stability and linear frequency response. The output buffer state included in the transducer amplifies the signal thus attaining a good interference tolerance even with higher cable lengths. The accelerometer is available in two ranges.
In addition to the operating voltage supply for the accelerometer the EM-72 monitors the output voltage from the transducer and indicates the malfunctions of the accelerometer or cable. With EM-72 the quantity being monitored can be selected from acceleration / velocity. The highly sophisticated adjustable low- and highpass filters increase the usability of this equipment as they make possible to monitor of just the desired frequency possible. The RMS weighted detector transforms the amplitude of vibration to corresponding DC-voltage. Logic stage controls the DC-level and induces a warning or alarm if the preset border values are exceeded. Alarms can be disabled with so-called alarm block input. All the settings of the system are done with rotating switches or easily readable DIP-switches.
The EM-72 has the outputs for following signals: vibration signal (Voltage), vibration level (mA), warning (relay output) and alarm (relay output).

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