Dwyer ULTM - Manual (Page 15)

You should also check proper installation by viewing the device manager.
If the USB driver installation failed, a “?” sign may be listed at the “Ports” item. In
other cases, the driver may be listed under “Other Devices” item. In both cases,
uninstall the device and than re-install it again.
Chapter 8. Reference Guide
Application Dimensions and Constraints
A) Basic Dimensions
• Distance
• Distance to full level (FULL)
• Level • Distance to empty level (EMPTY)
• Dead zone • Maximum range
• Full level • Near blocking distance (NBD)
• Empty level • Far blocking distance (FBD)
These variables are shown on the following figure along with the “Fundamental
Interdependency Equation”.
15 cm=Dead Zone < NBD < Full < Empty < FBD < Maximum range=8 meter
See also the section: Interdependencies in this chapter.
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Figure 17: Application Dimensions.