Petrochemical turbine speed probe
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How to determine the installation distance for the speed probe of petrochemical steam turbines
After tightening at the normal speed, turn it back 1.25 turns. . . Check the factory’s requirements
Strictly speaking, follow the installation instructions: tighten it and then retract it, using a feeler gauge to check
Multimeter for installing vibration probes, right, also for measuring rotational speed?
Electrodynamic eddy currents are generally adjusted by voltage; -10VDC is sufficient； For magnetoresistive types, it is necessary to refer to the manufacturer’s instructions; for example, in the case of Woodward: the gap between the MPU and the teeth of the flywheel disk is usually between 0.25 and 1.02 mm. If the gap cannot be measured directly, the sensor can be screwed in fully until it presses against the flywheel disc, and then withdrawn to an appropriate value. One full circle is approximately 0.0555 inches (about 1.5 mm for metric sensors).
What was said upstairs covers it pretty well; generally, turn it back a bit.
On our end, we turn it all the way down to 1 to 1.5 turns; it’s even better if a feeler gauge can be used to check it
It must be done according to the manufacturer’s requirements to achieve accuracy!
The installation of the speed probe should be such that the cross-section of the probe is 1 mm away from the convex surface of the device’s groove; it is only with the vibration displacement probe installed in this manner that voltage can be measured. When installing the probe, pay attention to the following: 1. Measure the thread of the probe corresponding to 1 mm ； Install it all the way down and then turn back out the corresponding number of threads. 2. Insert a metal object similar to a probe inside, turn the vehicle around to ensure that it is not positioned right in the groove, and then install the probe. Otherwise, once the device rotates, the probe may get damaged.