Selection Of Cables

Try to be more "specific" about the condition , it will help us to reply and you to understand as well.

Cable selection depends upon various things e.g., Length, type of control, temperature or environmental conditions, voltage grade,etc. etc,

Cable selection depends on the xmtr tied to each particular device, the voltage or amperage of the signal, the distance, etc. The exception is the ultrasonic devices. These will need to be transmitted through coax cable with the proper impedence specified by the Mfr. As said above, more info please.

FYI,

Siemens (formerly Milltronics ultrasonics) switched from coax to twisted pair for its ultrasonic level transducer-to-electronics box extension cabling about 3-4 years ago. A factory guy told me there had been significant improvements in the electronics to where signal-to-noise increased to the point where coax wasn't needed. I believe the transducers are still manufactured with a coax pigtail lead, but using TP for extended cabling is acceptable.

The Siemens Clamp-on ultrasonic flow transducers still use coax.

Application? -

• Hazardous area or not?
• Which industry?
• Location - building interior? Inland plant? Offshore installation? Ship? Aircraft?
• Direct buried or clipped to tray or run in conduit?
• Indoors or out?
• Low-smoke-and-fume?
• Bending radius restrictions?
• Etc.