Special Features
■ Process and system-specific solutions possible
■ Operating limits:
- Operating temperature: T = -80 ... +200 °C
- Working pressure: P = Vacuum to 100 bar
- Limit S. G.: ρ ≥ 400 kg/m3
■ Wide variety of different electrical connections, process connections and materials
■ Optionally with programmable and configurable headmounted transmitter for 4 ... 20 mA signals, HART®,PROFIBUS® PA and FOUNDATION™ Fieldbus
■ Explosion-protected versions
Description
The WIKA Model RMG sensors with reed chain technology serve as measuring transducers for level measurement in liquid media. They work on the float principle with magnetic transmission.
The float's magnetic system operates a resistance measuring chain within a guide tube, which corresponds to a 3-wire potentiometer circuit. The measurement voltage generated by this is proportional to the fill level.
The measurement voltage is finely-stepped as a result of the contact separation of the measuring chain and is thus virtually continuous.
Depending on the requirements, contact separations from 5 to 18 mm are available.
Further special features
■ Large scope of application due to the simple, proven functional principle
■ Process connection, guide tube material and float made of stainless steel 1.4571 or plastic
■ For harsh operating conditions, long service life
■ Continuous measurement of the liquid levels irrespective of physical or chemical changes of state of the measured media, such as: foaming, conductivity,
dielectric constant, pressure, vacuum, temperature, vapour, condensation, blistering, effects of boiling, density changes
■ Signal transmission over large distances
■ Simple installation and commissioning, onetime calibration only, no recalibration necessary.
■ Volume-proportional or depth-proportional display of the filling level
■ High repeatability
■ Interface layer measurement and overall level from Δ-density of more than 50 kg/m3
■ Level sensors with reed switch chain technology qualify as passive electrical equipment in accordance with DIN IEC 60 079-11 and can be installed in 'Zone 1' hazardous areas without certification, as long as the equipment is operated in a certified intrinsically safe circuit with a minimum explosion protection of EEx ib
Options
■ Customer-specific solutions
■ Programmable and configurable head-mounted transmitters in terminal box, 4 ... 20 mA output signal, 2-wire, for HART®, PROFIBUS® PA and FOUNDATION™ Fieldbus
■ Process connection, guide tube material and float made of stainless steel 1.4435, 1.4539, titanium, Hastelloy (others on request)
■ In combination with limit switch module, stepless setting of the limit values over the entire measuring range
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