7. Selection Issues 76–85
76. How do I select a capacitive level switch?
Start with the medium, dielectric characteristics, temperature, pressure, vessel material, installation position, probe length, process connection, and electrical requirements.
77. What medium information is required?
The manufacturer should know the liquid or solid material, concentration if applicable, temperature, and expected buildup characteristics.
78. Why is dielectric constant important?
Because the change in capacitance depends strongly on the electrical properties of the process material.
79. What probe material should I choose?
Probe material should be selected according to the process medium, temperature, pressure, and corrosion requirements.
80. How do I select the process connection?
The process connection should match the vessel nozzle or piping connection and the required pressure and sealing conditions.
81. How do I choose the probe length?
Select a length that places the sensing area precisely at the required alarm or control point.
82. How do I select a high-temperature version?
Consider maximum continuous temperature, peak temperature, pressure, medium, probe material, seal material, and required cable length.
83. How do I select a corrosion-resistant version?
Specify the exact chemical medium, concentration, temperature, and pressure so the wetted materials can be checked for compatibility.
84. How do I select a model for bulk solids?
Consider bulk density, dielectric properties, particle size, flow characteristics, buildup, and mechanical loading.
85. What technical information should I send to the supplier?
Provide medium, temperature, pressure, vessel dimensions, mounting position, process connection, probe length, power supply, output, and hazardous-area requirements if applicable.
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