Level Pressure How Temperature Liquid Registration Systems Services Solutions Analysis Components Technical Information Ultrasonic sensors for non-contact continuous level and flow measurement, ■ Continuous, non-contact level measurement of fluids, pastes, sludges and powdery to coarse bulk materials ■ Flow measurement in open channels and measuring ■ Maximum measuring range ■ Suited for explosion hazardous areas Your benefits ■ Non-contact measurement method; minimizes service ■ Integrated temperature sensor for time-of-flight correction. Accurate measurements are possible, even if temperature changes are present ■ Hermetically welded PVDF sensors FDU91/92 for fluid measurement, for highest chemical resistance ■ Integrated automatical sensor detection for transmitters FMU90, simple commissioning ■ Suited for rough ambient conditions thanks to separate installation from the transmitter ■ Reduced build-up formation because of the self- cleaning effect ■ Integrated heating against a build-up of ice at the sensor (optional), ensures reliable measurement ■ Weather resistant and flood-proof (IP68) ■ Dust-Ex and Gas-Ex certificats available (ATEX, FM, People for Process Automation

Prosonic S FDU90/91/91F/92/93/95/96 Table of Contents Function and system design. . . . . . . . . . . . . . . . . . . . . 3 Certificates and Approvals . . . . . . . . . . . . . . . . . . . . . 22 Measuring principle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Time-of-flight correction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Blocking distance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Transmitter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 CE mark . . . . . . . . . . ....

Function and system design Measuring principle BD: blocking distance, D: distance from sensor membrane to fluid surface, E: empty distance F: span (full distance), L: level, V: volume for mass), Q: flow Time-of-flight method The sensor transmits ultrasonic pulses in the direction of the product surface. There, they are reflected back and received by the sensor. The transmitter Prosonic S measures the time t between pulse transmission and reception. From t (and the velocity of sound c) it calculates the distance D from the reference point (see the figure —> S 4) to the product surface: From D...

Prosonic S FDU90/91/91F/92/93/95/96 Blocking distance The level L may not extend into the blocking distance BD. Level echoes within the blocking distance can not be evaluated due to the transient characteristics of the sensor and thus a reliable measurement is not possible. The blocking distance BD is dependent on the type of sensor: FDU96 FDU90 FDU95 FDU93 1.6 (5.25) FDU95-#2###: 0.9 (3.0) FDU95-#1###: 0.7 (2.3) 0.6 (2.0) 0.4 (1.3) B 0.3 (1.0) C 0.07 (0.23) A FDU91 FDU92 m (ft) L00-FDU9xxxx-05-00-00-xx-002 A: Without flooding protection tube, B: With flooding protection tube, C: Reference point...

Measuring range The effective range of the sensors is dependent on the operating conditions. To estimate the range, proceed as follows (see also the example): 1. Determine which of the influences shown in the following table are appropriate for your process. 2. Add the corresponding attenuation values. 3. From the total attenuation, use the diagram to calculate the range. ■ Silo with rubble: ~ 40dB These measuring conditions have been taken into account during the calculation of the maximum measuring range in solid applications.

Operating frequency Signal transmission analogue voltages Power supply Power supply The FDU90 and FDU91 sensors are optional available in a version with heater. The power for this heater must be provided by an external power supply unit. The supply voltage is connected to the brown (BN) and blue (BU) strands of the sensor cable. Technical data ■ If the sensor heater is applied, the integrated temperature sensor can not be used. Instead, an external temperature sensor (PtlOO or FMT131 from Endress+Hauser) must be used. The transmitter FMU90 is available in a version with an input for the external...

Electrical connection Connection diagram A Without sensor heater B With sensor heater 1 Screen of the sensor cable 3 Screen of the extension cable Colours of the strands: YE = yellow; BK = black; RD = red; BU = blue; BN = brown; GNYE = green-yellow

Prosonic S FDU90/91/91F/92/93/95/96 Connection hints Caution! • In order to avoid interference signals, the sensor cables should not be laid parallel to high voltage electric power lines. The cables may not be laid in the proximity to frequency converters. • The cable screen serves as a return cable and must be connected to the transmitter without any electrical break. With the pre-assembled cables, the screen ends in a black strand (BK). With the extension cable, the screen must be twisted together and connected to the "BK" terminal. The cable screen must not be connected to the local potential...

Prosonic S FDU90/91/91F/92/93/95/96 Shortening the sensor cable If required, the sensor cable can be shortened. Please note: • Do not damage the cores when removing the insulation. • The cable is shielded by a metallic braiding. This shielding serves as a return cable and corresponds to the black (BK) strand of the unshortened cable. After shortening the cable, loosen the metallic braiding, twist it together securely and connect it to the "BK" terminal. Caution! The protective earth conductor (GNYE), which is present in some of the sensor cables, may not be electrically connected to the cable...

Installation options A: at girder or angle bracket, B: with alignment unit FAU40, in ATEXZone 20 the alignment unit can be used for zone separation, C: with a 1" sleeve welded to a grating A: Installation with cantilever and wall bracket, B: Installation with cantilever and mounting frame, C: The cantilever can be turned in order to position the sensor over the centre of the flume. Cantilever, wall bracket and mounting frame are available as accessories (-> 1 31). B: FDU90: Mounted at front thread (G Vh" orNPT Vh") C: FDUQx Mounted at rear thread (G 1" or NPT1") D: FDU90, FDU91, FDU92: Mounting...