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22.2 Channel Verification (Common Channel Types)
The following sections include verification procedures for the most common channel types in the VC-
8000. For other channel types (Steam Turbine, Hydro, Recip, etc.) See the application guide for that
machine type.
22.2.1 Verifying Axial (Thrust) Channels
Use a DC power supply to validate these channels. The bias and Gap measurements will follow the
power supply input voltage.
Figure 22-1) Axial and Position verification
Position measurements are calculated from the Zero Position. The UMM Position measurement will
be:
= 1000 ∗
−
Where the Voltage is the input power supply voltage, the Zero Position is the configured zero position
(Volts) and the Scale Factor is the transducer scale factor (mV/Unit). The Upscale Direction setting
determine the sign (+ or -) of the data. For a standard proximity probe, the equation above is for
Upscale Direction = “Towards Probe”.
For example, if the input signal is -9 Vdc, the Zero Position is set at -10 Vdc, the transducer Scale
Factor is 200 mV/mil, and the Upscale Direction is “Towards Probe”, the position reading is:
1000 ∗
−9 −
(
−10
)
200
= 5
If the Upscale Direction setting is “Away From Probe” the Position will be - 5.0 mils.
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