The SITRANS FST090 transmitter is based on the innovative technology of the FST020 and FST030 and is therefore identical in use and operation. The FST090 transmitter is flexible, versatile, practical: in conjunction with the SITRANS FSS200 clamp-on sensors, it is up to practically any challenge.

The main benefits at a glance:

• Easy installation: just clamp it on, with no need to cut pipe or stop flow
• Minimal maintenance: sensors do not require upkeep or cleaning
• No moving parts to foul or wear
• No pressure drop or energy loss
• Wide turn-down ratio
• Precise single path measuring

Application

The SITRANS FS290 is often used for temporary checks in water supply and disposal. Cooling or hot water, reference quantities or leaks can be checked quickly in this way. A typical example is the monitoring and testing of fire protection systems or other emergency applications where there is flow.

The portable device is also versatile in the temporary use of measured values for stationary when measuring devices that have been removed for repair or calibration. In fact, the FS290 can be used almost anywhere liquid ultrasonic flow measurement is needed: such as check metering, i.e. the periodic checking of built-in clamp on sensors.

The SITRANS FS290 can be used to measure flow in many different material pipes. However, cement pipes and special plastic composite pipes cannot be used though due to their physical properties.

Inner coatings or liners are stored in the device and are taken into account when entering.

The SITRANS FS290 is suitable for pipes up to 5000 mm (200 inches) and for pipe wall thicknesses up to 50 mm (2.0 inches).

The recommended medium temperature range is from -40 °C to +121 °C. (-40 °F to 250 °F). For higher temperatures Siemens offers high temperature sensors up to maximum 230 °C (446 °F).

The transmitter comes supplied with a liquid table with all common material data for easy media selection. Relevant data can be easily and quickly adopted.

The SITRANS FS290 is not suitable for gases, steam and inhomogeneous liquids.

Design

The precision electronics of the SITRANS FST090 portable ultrasonic transmitter are housed in a robust weather proof case. The case protects the electronics under harshest of field conditions. The process and control connections are accessed on the top of the device, with industrial connectors, that can be quickly and securely employed. The system can be powered with an swappable rechargeable battery, providing power for 24 hours or more as well as via mains power with the system’s Vac power adapter, for a more permeant installation.

The transmitter reads the measured process values from the transducers and calculates derived values, that are converted into flow values that are then displayed. The FST090 provides Modbus communications, as well as a 4-20 mA output, a single relay and two digital inputs for totalizer start/stop and reset. Additionally there is also a pulse/frequency output an USB service port, and a local multi functional display. The system provides easy to use totalizers, access control, diagnostics, and menu driven system configuration.