Continuous Probes

For use with PRINCO™ level transmitters

Many factors are involved in selecting a probe for continuous level transmitters and multiple point controllers.  There are electrical, chemical, and mechanical aspects to be considered.

Electrically, a ground reference (such as the vessel wall) must be present and the probe must be built to provide proper response.

Chemically, the probe must be compatible with the process material.  It must be immune to attack and must offer no chance of contaminating the process.

Mechanically, the probe must be able to withstand the pressure and temperature extremes of the application.  In addition, turbulence, consistency, viscosity, abrasion and mounting configuration may also play a role in probe selection.  A flexible probe is required where probe lengths exceed 236 inches or where physical restrictions (i.e., lack of headroom) prevents installation of a rigid probe.

Even though all of these factors may demand consideration when selecting a probe, most applications are easily defined and the proper probe can be quickly selected.

Probe Selection Guide

Listed at right and below are the nine most common types of application and the probe recommended for each.  Please refer to the following pages for a complete description of each system.

Conductive Liquids ~ 100 Micromhos/cm or Higher (water-based liquids)

Non-Conductive Liquids ~ 5 Micromhos/cm or less (hydrocarbons, solvents, etc.)

Materials of Construction

• NPT vessel connections are 316 Stainless Steel.  Special alloys can be provided.

• Seals are Teflon.

• Ground elements on Systems III through IX are Stainless Steel.

• Flanges are Carbon Steel (standard), Type 316 or 304 Stainless Steel (optional).  

[For other alloys or material, consult factory]