Siemens SITRANS LC 500 Probe Configuration, SITRANS LC 500 Electrode Probe Characteristics

Probe Configuration

SITRANS LC 500: Probe Configuration

The probe (electrode) comprises a measurement section and an active shield section. This electrode connects to the capacitance detector portion of the two-wire loop powered electronic transmitter. The transmitter module is mounted in a powder-coated aluminum enclosure which provides reliable operation in environments with dust, moisture, and high-frequency interference.

SITRANS LC 500 Electrode (Probe) Characteristics

Apply to all general connection configurations:

•The standard SITRANS LC 500 insulated electrode is designed for use in both conducting and non-conducting liquid applications.

•Most electrodes consist of an active shield portion and a measurement portion, which combine to form the complete electrode. (This is not the case for cable electrodes or electrodes with ceramic/enamel insulation.)

•The sum of the active shield length and the measurement length is the total insertion length.

•The active shield design provides continuous immunity from changes in conditions at the top of the vessel where levels of vapors, dust, and condensation may be constantly changing.

•The design of the active shield isolates the starting capacitance of the electrode from the effects of changes in capacitance due to temperature and pressure fluctuations that could cause small changes in the seal geometry.

•The carefully-controlled diameter of the electrodes and insulation produces a linear output over a wide range of capacitance values (1 pF to 3300 pF).

•The end seal is formed as an integral part of the electrode insulation, giving smooth and uniform characteristics (tested to 55 kV).

•Standard single cone seal

active shield

insertion length

measure- ment

probe portion seal

(inactive)

Page 16 SITRANS LC 500 – INSTRUCTION MANUAL 7ML19985GE01