7200 Series Radar Tank Gauges
The 7200 Series Radar Tank Gauges (RTG) are used for continuous, non-contact level measurement of bulk liquids. Non-contact measurement means no moving parts, no product contact and extremely low maintenance. Changing process conditions or material viscosity, such as temperature changes, gas blankets, pressures or vapors, have negligible effect on radar measurement.
- ±3...10 mm accuracy
- Two-wire integration with all tank sensors via the 4590 TSM
- Intrinsically safe wiring for all on-tank sensors reduces wiring costs and improves reliability
- Integrated handheld unit provides on-tank operation via menu-driven alphanumeric display, easy commissioning and diagnostics
- Two frequency ranges - 6 and 26 GHz provide the correct frequency for every application
- HART®, Profibus or Foundation Fieldbus protocols
- Suitable for process temperatures up to 200 °C (392 °F), up to 400 °C (752 °F) with high-temperature antenna
- Application in safety related systems (overspill protection) with requirements for functional safety up to SIL 2 in accordance to IEC 61508/IEC 61511-1.
Tank Gauging System
The 4590 Tank Side Monitor (TSM) provides integrated communications for sites with multiple tanks, each with one or more sensors on the tank, such as radar, spot or average temperature, capacitive probe for water detection and/or pressure sensors. Tank Side Monitor protocol output options guarantee connectivity to all standard tank gauging protocols. Optional connectivity of analog 4...20 mA sensors, digital I/O and analog output simplify full tank sensor integration. An intrinsically safe HART bus (HART multi-drop) for all on-tank sensors yields extremely low wiring costs, while also
Antenna
It is essential for each and every application and installation to evaluate the right antenna type. The antenna selection depends on the following criteria (refer to the Radar Selection Guide for more information):
- Type of application (i.e. free space vs. stilling well)
- Installation possibilities (size, location and height of nozzle)
- Properties of the product stored in the tank (radar reflectivity, vapor pressure, temperature, etc.)
- Accuracy requirements
7230 RTG with horn antenna is suitable for free space applications that disallow the use of a parabolic antenna due to tank/nozzle geometry. It is essential that the horn extends below the nozzle. The general rule for diameter selection is "the larger, the better," as a larger aperture of the antenna generates a narrower beam and has a better gain – signal to noise (S/N) ratio.
7231 RTG with rod antenna is used for measurements where only small diameter nozzles are available and tanks containing condensing products (or heavy water condensation) or corrosive products, such as sulphur, as the rod is easy to clean and has good "drip-off" properties.
7240 RTG with the small (1½") horn antenna is ideally suited for small vessels. Additionally, it provides an accuracy of ±3 mm.
7245 RTG combines the advantages of the horn antenna with high chemical resistance while being easy to clean.
On-site Operation
The handheld LCD unit (four lines with 20 characters each) allows configuration via three keys directly at the instrument. It can be removed to ease operation by simply pressing the snap-fit. It is connected to the device by means of a 500 mm cable. All device functions can be set through a menu system. The menu consists of function groups and functions. Within a function, application parameters can be read or adjusted. The user is guided through a complete configuration procedure.
