FMU671
FMU671
FMU671
FMU671
FMU671
FMU671
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FMU671

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Endress+Hauser FMU671 is a one-channel Nivosonic transmitter for continuous, non-contact ultrasonic level and volume measurement in liquids and bulk solids.
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Technical specifications for FMU671

  • Manufacturer:
    Endress Hauser
  • Part Number:
    FMU671
  • Product Family:
    Endress Hauser
  • Product Type:
    Ultrasonic Level Transmitter
  • Stock:
    1
  • Measurement Channels:
    1
  • Compatible Sensors:
    DU 40, DU 41, DU 42 S, DU 42 C, DU 43 S, DU 43 C, DU 44 Z, DU 46 Z, DU 73 S, DU 73 C
  • Linearization:
    Programmable vessel-volume curve with up to 30 reference points
  • Power Supply:
    24 V DC; operating range 20–30 V DC
  • DC Current:
    Approximately 90 mA; 125 mA maximum
  • Plug Connection:
    30-pole DIN 41612 Part 3 Type F multipoint plug
  • Current Output:
    4–20 mA, switchable to 0–20 mA; 500 Ω maximum load
  • Voltage Output:
    2–10 V, switchable to 0–10 V; 2 kΩ minimum load
  • Limit Outputs:
    Two independent relays, each with one potential-free change-over contact
  • Relay Switching Capacity, AC:
    2.5 A maximum, 250 V maximum; 300 VA maximum at cos φ 0.7
  • Relay Switching Capacity, DC:
    100 V maximum; 90 W maximum
  • Maximum Cable Resistance:
    25 Ω per core
  • Front Protection:
    IP20
  • Board Protection:
    IP00
  • Operating Temperature:
    0…+70 °C
  • Storage Temperature:
    −20…+85 °C
  • Weight:
    0.3 kg
  • Tariff Code:
    9026100000
  • Country of origin:
    Switzerland
  • Place of shipment:
    Xiamen, Fujian, China
By purchasing this item, you agree to the Terms & Conditions, ApterPower is not an authorized distributor for listed manufacturers or tradenames and therefore the manufacturer's warranty does not apply. All our products come with ApterPower's 1-year warranty.

More Information

Overview Manuals Signal Diagnostics Installation Application
  • Processes one compatible DU ultrasonic sensor for continuous, non-contact level or volume measurement
  • Provides direct front-panel operation with LCD indication, bar graph, matrix fields, and status LEDs
  • Supports fixed-target suppression, vessel linearization, Rackbus dialogue, analog outputs, and relay alarms

Endress+Hauser FMU671 is a Nivosonic ultrasonic level transmitter designed for continuous, non-contact measurement of liquids and bulk solids.

It evaluates ultrasonic echo signals from one compatible DU sensor, converts the result to level or volume, and supplies configurable current, voltage, limit-relay, and fault-relay signals for local or supervisory control.

Before installation or replacement, verify sensor compatibility, 24 V DC supply, plug wiring, cable resistance and shielding, output scaling, front-panel parameters, Rackbus address, and enclosure arrangement.

Availability, condition, price, and shipping time for Endress+Hauser FMU671 are confirmed during quotation.

Endress+Hauser FMU671 Ultrasonic Level Transmitter Manuals, Product Family, Links

Important Notice: Other accessories, manuals, cables, calibration data, software, etc. are not included with this equipment unless listed in the above stock item description. All prices are shown in USD.

  • Echo run time and amplitude are statistically evaluated to identify the product-surface echo
  • Fixed-target suppression can reject interference echoes from struts, seams, edges, and vessel fittings
  • The stored envelope curve, signal strength, temperature, and signal-to-noise information support measurement analysis
  • A steady bottom red LED indicates a fault, while a flashing red LED indicates a warning
  • The analog output can move to −10%, +110%, or hold the last measured value when a fault occurs
  • Online diagnosis can use analog-current measurement, an oscilloscope, or a connected service computer
  • The DIN 41494 Racksyst board must be mounted outside explosion-hazardous areas
  • Installation options include a 7 HP Monorack housing, an IP65 field housing for six units, or an 84 HP rack for up to eleven units
  • The operating range is 0…+70 °C and the documented storage range is −20…+85 °C
  • Continuous non-contact level and volume measurement of liquids in vessels
  • Continuous level and volume measurement of fine-grained or coarse-grained bulk solids
  • Ultrasonic measurement on conveyor belts using the dedicated application parameter
Description
Endress+Hauser FMU671 is a Nivosonic ultrasonic level transmitter for continuous, non-contact level and volume measurement in vessels containing liquids or bulk solids.

The transmitter accepts one compatible DU ultrasonic sensor, evaluates echo run time and amplitude, suppresses fixed interference echoes, linearizes vessel volume, and provides configurable current, voltage, limit-relay, and fault-relay outputs. FMU671 can be configured from its front panel or through supported Rackbus dialogue equipment.

Before installation or replacement, confirm the exact FMU671 model, compatible DU sensor, 24 V DC supply, DIN 41612 plug wiring, cable resistance and screening, output configuration, rack or protective housing, and nonhazardous mounting location.
Alternative Names
FMU671 FMU 671 Endress+Hauser FMU671 Endress+Hauser FMU 671 Endress Hauser FMU671 Endress Hauser FMU 671 Nivosonic FMU671 Nivosonic FMU 671
Technical notes
Endress+Hauser FMU671 is a one-channel Nivosonic ultrasonic level transmitter; verify DU sensor type, 24 V DC supply, plug wiring, and mounting enclosure.
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FAQS

The following is a list of questions commonly asked by our customers. Please contact us if you have a question about our process that is not answered below.
Which ultrasonic sensors can be connected to Endress+Hauser FMU671?
Endress+Hauser FMU671 accepts one DU 40, DU 41, DU 42 S, DU 42 C, DU 43 S, DU 43 C, DU 44 Z, DU 46 Z, DU 73 S, or DU 73 C sensor. Confirm the exact sensor suffix because cable construction and application limits can differ.
What is the practical difference between Endress+Hauser FMU671 and FMU676?
Endress+Hauser FMU671 has front-panel keys and an LCD for direct calibration and operation. The related FMU676 is operated through a Commulog handheld terminal or remote dialogue, so it must not be supplied as an interchangeable front-operated unit.
How does Endress+Hauser FMU671 handle false echoes from vessel fittings?
Endress+Hauser FMU671 can store the envelope curve and apply fixed-target suppression to echoes from struts, welded seams, edges, and fittings. During commissioning, map the interference echoes while ensuring the true product-surface echo remains detectable.
What happens to the Endress+Hauser FMU671 outputs when a measurement fault occurs?
The analog output can be configured to move to the −10% or +110% level or hold the last measured value. A separate potential-free change-over relay provides the fault indication, allowing the host system to distinguish measurement failure from normal level switching.
Can Endress+Hauser FMU671 be installed directly in an explosion-hazardous area?
No. The official installation information requires the FMU671 Racksyst plug-in board to be installed outside explosion-hazardous areas, either in a rack or suitable protective housing. The connected sensor and field wiring must be assessed separately for the actual area classification.
What cable checks are important when replacing Endress+Hauser FMU671?
Verify the sensor cable type, terminal assignment, and maximum resistance of 25 Ω per core. In strong magnetic or electric fields, use screened twisted cable and connect the screen at the sensor end only, as specified by the manufacturer.
How can the front indicators help troubleshoot Endress+Hauser FMU671?
The central green and red LEDs show limit-relay state, the lower green LED shows remote dialogue, and the bottom red LED reports device condition. A steady red light indicates a fault, while a flashing red light indicates a warning requiring diagnosis rather than immediate module substitution.