LEVEL TRANSMITTERS

GSI represents the leading level measurement technologies for continuous and point level application.  Our extensive application expertise includes both liquids as well as bulk solids.  We provide value to our customers in selecting the right technology for process vessels as well as storage tanks.

Radar

Hydrostatic

Nuclear

Level Switches

Radar Level Transmitters

A radar antenna is mounted on the top of the tank and emits a microwave signal that is reflected off the surface of the liquid level.  A pulse of microwave energy is emitted from the antenna and the time is measured until the returned signal is received back at the antenna.  Current radar technology includes free space and guided wave, which utilizes a rod or cable that extends to the bottom of the vessel.  Radar technology is largely unaffected by process vapors, dust, steam, or foam.  It has no moving parts, is very accurate, and does not require periodic calibration.  

Hydrostatic

Hydrostatic level transmitters measure the head pressure of a column of fluid to calculate tank level.  Assuming the fluid density is known; these instruments are simple, accurate and reliable.  They can measure atmospheric or pressurized vessels and are typically mounted at the bottom of the tank. 

Nuclear

Radiation based level measurements consist of a source holder of gamma material on one side of the vessel and a nuclear detector on the opposite side.  The source holder emits a pre-determined amount of radiation at a known angle.  The focused radiation travels through the vessel walls to the detector on the other side.  As product level rises in the vessel it blocks a portion of the radiation beam.  The measurement is completely non-contact and each component is mounted outside of the vessel. 

Level Switches

A variety of technologies including vibration, conductivity, and RF capacitance provide reliable high or low level alarming for liquids or solids.  Top or side mounting configurations is available with relay or current switching outputs.