FMU42 Ultrasonic Level Gauge
2025-12-15
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Ultrasonic Level Gauge FMU42
Overview
Today we will introduce an ultrasonic level gauge FMU42 that can be used for level and flow measurement. Below is its display diagram.
Working Principle
Its working principle is that the ultrasonic sensor emits high-frequency pulse sound waves, which reflect when encountering an object. The sensor can obtain the distance based on the time difference between the emitted and received reflected waves, and convert it into a current between 4-20mA for output. It is worth noting that the instrument cannot be in contact with it when measuring the level. The sensor emits ultrasonic pulse signals towards the surface of the liquid. The ultrasonic pulse signal is reflected on the surface of the medium, and the reflected signal is received by the sensor. The device measures the time difference t between sending and receiving pulse signals. Based on the time difference t (and acoustic velocity c), the device calculates the distance between the sensor diaphragm and the surface of the medium, D: D=c ⋅ t/2, and calculates the liquid level L through the distance D. By using the linearization function, the volume V or mass M can be calculated from the liquid level L. The user inputs a known blank distance (E), and the calculation formula for the liquid level (L) is as follows: L=E - D. The built-in temperature sensor (NTC) compensates for the sound velocity changes caused by temperature changes.
Key Terminology
SD safety distance
BD blind zone distance
E empty standard distance
L liquid level
D sensor diaphragm to medium surface distance
F range (full standard distance)
Measurement System Components
The following is a schematic diagram of its measurement system:
PLC (programmable logic controller)
Commubox FXA195
computer, installed with debugging software (such as FieldCare)
Commubox FXA291, with ToF adapter FXA291
equipment, such as Prosonic
Field Xpert
VIATOR Bluetooth modem, with connecting cable
connectors: Commubox or Field Xpert
transmitter power supply unit (built-in communication resistor)
Installation Guidelines
The following is a schematic diagram of installation conditions:
distance from the tank wall: ¹⁄₆ 2 of the container diameter, installation of protective cover; Avoid direct exposure of instruments to sunlight and rain
It is prohibited to install the sensor in the center of the tank.
Avoid measuring in the feeding area.
It is prohibited to install limit switches or temperature sensors within the beam angle range.
Internal devices with symmetrical structures, such as heating coils, baffles, etc., will interfere with the measurement.
Installation precautions for sensors perpendicular to the surface of the medium:
Only one device should be installed on the same tank.
Install the measuring device on the upstream side, with the installation height as high as possible above the highest liquid level Hmax,
The installation of the short tube insertion end adopts an angled inclined socket.
The installation position of the measuring equipment must be high enough to ensure that the material will not enter the blind spot distance even when it is at the highest level.
Installation Examples
The following figure is an example of installation.
A uses a universal flange for installation.
B uses an installation bracket, which is generally used in non explosion proof areas.
Instrument Fixing Steps
Complete the following steps to fix the instrument
Loosen the fixing screws.
Rotate the casing to the desired position, with a maximum rotation angle of 350 °.
Tighten the fixing screws to a maximum torque of 0.5 Nm (0.36 lbf ft).
Tighten the fixing screws; Use metal specific adhesive.
The above is its basic introduction
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CUS52D turbidity sensor
2025-12-15
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CUS52D Digital Sensor Overview
CUS52D is a digital sensor used for measuring turbidity and particulate matter concentration in drinking water and process water.image
Measurement Principle
The measurement principle is that the sensor operates based on the 90 ° scattered light principle, complies with the ISO 7027 standard, and meets all the requirements of this standard. The ISO 7027 standard is a mandatory standard for turbidity measurement in the drinking water industry.imageWhen there is a deviation, the transmitter will trigger an error alarm
Complete Measurement System
A complete measurement system, including a transmitter, sensors, and the option to choose whether to equip a bracket according to requirements.image
Sensor Structure
Sensor structureimage1 is the light receiver, and 2 is the light source.
Calibration
When conducting factory calibration, each CUS52D sensor uses a dedicated Calkit solid-state calibration module. Therefore, the Calkit solid-state calibration module is matched (paired) with specific sensors one by one.Users can use CUY52 calibration container to quickly and reliably calibrate sensors. By creating reproducible basic operating conditions (such as containers with minimal backscattering, shields that block interfering light sources), it is easy to adapt to the current measurement point. There are two different types of calibration containers that can be used to fill calibration solutions (such as formalin)
Memosens Digital Sensors
Memosens digital sensors must be connected to Memosens digital transmitters for use. The analog sensor cannot transmit to the transmitter normallyMemosens digital sensors store calibration parameters, operating time, and other information through built-in electronic components. By connecting to a transmitter, the parameters can be automatically transmitted for measurement and calculation. It supports offline calibration, quick replacement, pre maintenance planning, and historical data archiving, thereby improving measurement quality and equipment availability.
Electrical Connection
There are two ways of electrical connection: 1. M12 plug connection, 2. Sensor cable directly connected to the input signal terminal of the transmitter
Working Parameters & Error
The working temperature is generally 20 ℃, and the maximum measurement error is: turbidity is 2% of the measured value or 0.01 FNU, and solid content is less than 5% of the measured value or 1% of the maximum range. The measurement error does not include the error of the standard solution itself. When measuring the solid content, try to make the medium distribution relatively uniform, otherwise it will cause fluctuations in the measurement value and increase the measurement error.
Installation Guidelines
Install instanceSensors should be installed in locations with stable fluid conditions, preferably in pipelines where the medium flows vertically upwards, or in horizontal pipelines; It is strictly prohibited to install in locations where gas accumulation, bubbles, or deposition are likely to occur, and to avoid installing in pipelines where the medium flows vertically downwards. It is also prohibited to install fittings behind the pressure reducing pipe section to prevent degassing.
Environmental Specifications
The ambient temperature range is between -20... 60 ℃, and the storage temperature is between -20... 70 ℃. The highest protection level can reach IP68, and the temperature range of stainless steel sensors is between -20... 85 ℃. If it is plastic, the highest temperature will be lower.
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Key components and significance of explosion-proof certification
2025-12-15
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Explosion proof mark (Ex) is a universal mark indicating that the equipment has passed explosion-proof certification and is suitable for environments where explosive gases may be present.
Explosion proof form
(1) Explosion proof type (d): The equipment has a sturdy shell that can withstand internal explosion pressure and prevent internal explosions from spreading to the surrounding area, such as motors in chemical factories. Divided into da, db, and dc, corresponding to different device protection levels.
(2) Increased safety type (e): Designed to reduce the possibility of ignition and used in safer explosive environments, such as some lighting fixtures.
(3) Intrinsic safety type (i): prevents ignition by limiting circuit energy, suitable for more hazardous environments. Divided into IA, IB, and IC, IA can be used for Zone 0 (continuous presence of explosive gases).
(4) Positive pressure type (p): Maintain positive pressure inside the equipment to prevent external explosive gases from entering, such as some large electrical installations.
(5) Oil immersed type (o): Immerse the equipment in oil to prevent internal components from coming into contact with external explosive substances and causing ignition.
(6) Encapsulation type (m): Encapsulate the equipment in resin to isolate potential ignition sources inside.
Equipment category
(1) Class I: Used for underground (methane) gas equipment in coal mines.
(2) Class II: Suitable for explosive gas environments other than underground coal mines, divided into IIA, IIB, and IIC. IIC can be used in IIA and IIB environments, with the highest level of danger.
(3) Class III: Used in explosive dust environments other than coal mines, divided into IIIA (combustible fly ash), IIIB (non-conductive dust), and IIIC (conductive dust).
The temperature group (T1-T6) represents the highest temperature level that the surface of the equipment may reach during normal operation. T1 (maximum 450 ℃) - T6 (maximum 85 ℃), the higher the temperature group, the lower the allowed maximum surface temperature, and the safer it is in hazardous environments. It is necessary to ensure that the equipment temperature group is lower than the ignition temperature of surrounding explosive gases.
Equipment Protection Level (EPL)
(1) Explosive Gas Environment: Ga ("very high" protection level, not an ignition source in normal, expected, or rare faults); Gb ("high" protection level, not the ignition source during normal and expected failures); Gc ("General" protection level, not the ignition source during normal operation).
(2) Explosive dust environment: Da ("very high" protection level); Db ("high" protection level); Dc ("General" protection level).
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Common explosion-proof certifications
2025-12-15
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International certification (preferred for instruments and meters)
IECEx certification (International Electrotechnical Commission Explosion proof Certification), abbreviated as IECEx
Applicable to: instruments and meters from over 30 countries worldwide (China, European Union, United States, Australia, etc.), such as pressure transmitters, temperature sensors, analytical instruments, etc.
Nature: Voluntary international certification with the highest degree of mutual recognition.
Standards: IEC 60079-11 (Intrinsic Safety Type "i"), IEC 60079-28 (Gas Detection Instruments), IEC 61241-0 (General Requirements for Dust Environments).
Certification body: Laboratories accredited by the International Electrotechnical Commission (such as NEPSI in China and PTB in Germany).
Features: With one certification, it can enter multiple national markets, reducing repeated testing; The certificate includes the Ex logo and explosion-proof parameters (such as Ex ia IIC T6 Gb).
ATEX certification (EU Explosion proof Directive), abbreviated as ATEX
Applies to: instruments and meters in the 27 EU countries and the EEA (such as process control instruments and gas detectors).
Nature: Mandatory certification, a necessary condition for entering the EU market.
Standards: ATEX 2014/34/EU directive, EN 60079-11 (intrinsic safety type), EN 61241-10 (dust explosion-proof instruments).
Certification bodies: EU notified bodies (such as T Ü V in Germany and LCIE in France).
Characteristics: The certificate should indicate the equipment category (such as Class II), explosion-proof type (such as d explosion-proof type), gas group (such as IIC), etc., covering mining (Class I) and factory (Class II) equipment.
Core certification in Asia (mainly in China, Japan, and South Korea)
China Explosion proof 3C Certification (Instrument and Meter Special), abbreviated as Explosion proof 3C (Instrument and Meter Category)
Scope of application: Explosion proof instruments and meters in the Chinese market (such as pressure transmitters, temperature controllers, analytical instruments).
Nature: Compulsory certification (implemented from 2020).
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FMR50 radar level gauge, advanced instrument
2025-12-15
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FMR50 Radar Level Gauge
Product Overview
FMR50 is a radar level gauge used for continuous non-contact level measurement of liquids, slurries, and mud. It is a very powerful product with a maximum measurement range of 40m, and the enhanced version can reach 50m. The process temperature range is between -40....+130 ℃ and the process pressure is between -1....+3 bar, making it suitable for most places. The measurement accuracy error is between 2mm. Has passed multiple certifications such as International Explosion proof, WHG, etc.
Key Advantages
Completes measurements even when the medium and process conditions change.
Equipped with HistoROM intelligent data management, it can easily complete debugging, maintenance, and diagnosis.
Multi-loop signal tracking technology to ensure high reliability.
Equipped with Bluetooth wireless technology.
Heartbeat detection technology.
Measurement Principle
Micropilot is a "top-down" measurement system based on the Time of Flight (ToF) principle, which measures the distance between the reference point (process connection) and the surface of the medium. The antenna emits radar pulse signals, which are transmitted on the surface of the medium, and the reflected signals are received by the instrument.
R is the measurement reference point (lower end face of flange or threaded connection), E is the empty mark (zero point), F is the full mark (full range), and D is the measurement distance L liquid level (L=E-D). The antenna receives radar pulse reflection signals and transmits the reflected signals to the instrument. The microprocessor in the instrument performs signal analysis to identify the true reflected echo of the radar pulse signal on the material surface. D is proportional to the running time, D=c * t/2, c is the speed of light, L=E-D.
The instrument is equipped with interference echo suppression function, which can be activated by the user themselves. The interference echo suppression function and the multi-channel echo signal tracking algorithm together determine that interference echoes will not be misidentified as true level echoes. When debugging the Micropilot instrument, the core is to input the empty distance (zero point), full distance (full range), and corresponding application parameters, and the instrument will automatically adapt to the actual working conditions on site.
Different output types of instruments have default factory settings: the zero point of current output type corresponds to 4mA, and the full range corresponds to 20mA; the zero point of digital output type and display unit defaults to 0%, and the full range defaults to 100%, which can meet basic measurement needs without additional settings.
Technical Specifications
The measurement variable of this instrument is the distance from the reference point to the surface of the medium, and linearization can convert the measured level into other variables. The effective measurement range depends on the antenna size, medium reflectivity, installation location, and final interference reflection. The K-band with a working frequency of 26GHz.
The output signals include:
HART and Bluetooth ® Wireless technology
PROFIBUS PA
FOUNDATION Fieldbus
Switching output
There are two types of wiring methods: two-wire and four-wire. There are also two voltage options: 24Vdc and 240Vac.
The working range of the measuring equipment is between -40....+80 ℃, and the working range of the on-site display unit is between -20....+70 ℃. For higher temperature requirements, a separate display unit can be selected, which is more resistant to low temperatures. Basically applicable to the vast majority of places.
The protection level can reach IP68 and NEMA6P. The seismic resistance also meets multiple standards. The above is a basic introduction to this instrument.
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