The voltage driver has a dynamic voltage output that is compatible with industry-standard continuous vibration monitoring systems and is the format specified in API Standard 670. The dynamic voltage output is proportional to the DC gap between the target material and the probe tip.

Probe showing proportional output for the 4-20mA signals. With shaft surface at 50 mils, 4 – 20 output is 12mA. If the gap increases to 70 mils, 4 – 20 output will be 16mA.

In radial applications, the probe drivers select the average shaft surface distance and the 4-20 is proportional to the overall peak to peak vibration in mils around the average surface of the shaft.

In the thrust position the probes auto range to the face of the shaft or thrust collar and the 4-20 is proportional to the positive or negative vibration away or toward the probe as shown.