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Measuring transducers are devices that convert physical measured variables such as temperature, pressure, humidity, flow, level or electrical signals (e.g. current, voltage) into a standardized electrical signal.

This enables reliable and accurate transmission of measured values to control and monitoring systems. Transducers play an important role in industrial automation and in measurement and control technology.

The following is an overview of the functionality, types and use of transducers and their advantages.

Definition and mode of operation:

• Transmitters take an input signal from a sensor or measuring point and convert it into a standardized output signal (e.g. 4-20 mA, 0-10 V, digital signals such as HART, Modbus or Profibus).
• They can amplify, filter, linearize or galvanically isolate signals in order to avoid interference and improve signal quality.

Types of transducers:

1. Temperature transmitters:
Convert signals from temperature sensors (e.g. thermocouples, RTDs) into standardized electrical signals.

2. Pressure transmitters:
Measure the pressure of gases or liquids and provide a proportionally corresponding output signal.

3. Flow transmitters:
Detect the flow of liquids or gases in pipes and output a corresponding signal for monitoring and control.

4. Level transmitters:
Measure the level of liquids or bulk materials in tanks or silos and output a standardized signal for level monitoring.

5. Humidity transmitters:
Convert relative humidity into a standardized output signal used for control and monitoring in HVAC systems (heating, ventilation, air conditioning) or process applications.

6. Current and voltage transmitters:
Measure electrical variables such as current or voltage and convert them into a standardized signal for monitoring or control.

Areas of application for measuring transducers:

1. Industrial process control:
Transmitters are often used in the process industry (chemicals, petrochemicals, food, pharmaceuticals, metallurgy) to monitor and control various parameters such as pressure, temperature, flow and level.

2. Automation technology:
In manufacturing and automation technology, transmitters ensure the precise acquisition and transfer of measurement data to control systems such as PLCs (programmable logic controllers) or DCSs (distributed control systems).

3. Building automation:
In HVAC systems (heating, ventilation, air conditioning), transmitters are used to measure and control parameters such as temperature, humidity, air quality and pressure.

4. Energy management and supply:
In power plants, water treatment plants, gas and electricity supply networks, transducers measure parameters such as flow, pressure and temperature in order to monitor and optimize operations.

5. Environmental monitoring:
They are used to record environmental parameters such as air quality, water quality and weather conditions.

6. Medical devices:
In medical technology, transmitters record parameters such as temperature, pressure and humidity to enable safe and effective diagnosis and treatment.

Advantages of using transmitters:

• Transmitters unify various sensor data into standardized signals (e.g. 4-20 mA, 0-10 V) that can be easily integrated into control systems.
• They amplify and linearize the signals, which increases the accuracy and reliability of the measurement.
• Through galvanic isolation and filtering, transmitters protect against electromagnetic interference and ground loops.
• Many transmitters are configurable and can be adapted for different measured variables and applications.
• They enable cost-effective signal transmission over long distances as they amplify the signals and minimize interference.

Transmitters are indispensable in many applications as they provide precise and reliable measurement data for control and monitoring systems. They make a decisive contribution to efficiency, safety and quality in various industries and applications. The correct selection and use of transmitters is crucial to ensure the best possible performance and measurement accuracy in each specific application.

Here is an overview of the most important points to consider when buying transmitters.

When purchasing transmitters, there are a variety of factors that should be considered to ensure the device meets the requirements of the specific application.

• Determine the physical quantity to be measured, e.g. temperature, pressure, flow, level, humidity or electrical signals (current/voltage).
• The transmitter must be compatible with the specific sensor used in the application (e.g. thermocouple, RTD for temperature; piezo sensors for pressure).
• Ensure that the transducer supports the correct input range and sensor configuration.
• Select the output signal type that matches your control system. Common analog signals are 4-20 mA or 0-10 V. If digital communication is required, make sure the transducer supports protocols such as HART, Modbus, Profibus or Ethernet.
• The transducer should provide sufficient resolution to ensure measurement accuracy for your application. check the specific signal range and signal processing characteristics of the device.
• Pay attention to the specified accuracy of the transmitter. This is often given as a percentage of the measurement range or as an absolute number (e.g. ±0.1% of range or ±0.1 °C).
• Choose a transmitter with good long-term stability, especially if the device will be in use for long periods of time. This will reduce the need for frequent calibrations.
• Ensure that the transducer is suitable for the ambient temperature in which it will be used. check the specified operating temperature range.
• If the converter is used in harsh or humid environments, it should have an appropriate degree of protection (e.g. IP65, IP67).
• In potentially explosive areas, it is important that the converter has appropriate certification such as ATEX or IECEx.
• Pay attention to the mounting options offered by the transmitter (e.g. top-hat rail mounting, wall mounting, field housing). The installation environment can influence the choice of mounting method.
• The dimensions of the transmitter should match the spatial conditions in which it is installed.
• If integration into a digital communication network is required, check that the transmitter supports the required protocols (e.g. HART, Modbus, Profibus, Ethernet/IP).
• Some transmitters offer extended functions for remote configuration and diagnostics. consider whether you need such options to facilitate maintenance tasks.
• A transmitter with galvanic isolation between input, output and supply circuits is important to minimize interference, ground loops and signal distortion, especially with long cable runs or in environments with strong electromagnetic fields.
• Make sure that the converter is supplied with a calibration certificate that is traceable to international standards. This is important for applications that are subject to strict regulatory requirements.
• Check how often the transducer needs to be calibrated and whether the calibration can be performed internally or externally.
• Some transmitters offer advanced functions for self-diagnosis and fault detection (e.g. wire break detection, short circuit warning). These functions are useful for troubleshooting and maintenance.
• An integrated display or operating elements on the device can be helpful for reading the measured values directly at the measuring point and making settings.
• The converter should be compatible with the power supply at the place of use (e.g. 24 V DC, 230 V AC).
• Pay attention to the energy consumption of the transmitter, especially if many devices are used. Low energy consumption can reduce operating costs.
• Ensure that the transducer complies with the required international and regional standards and certifications (e.g. CE, UL, CSA, ATEX).
• Specific industries (e.g. pharmaceuticals, food) have special requirements for the measuring devices. Check whether the transducer meets these requirements.
• Note that a cheaper transducer may be more expensive in the long term if it needs to be serviced or replaced frequently.
• Pay attention to the warranty terms and the customer support offered. Good customer service and a long warranty period can be valuable in the event of breakdowns or problems.

Choosing the right transmitter requires a careful analysis of the specific requirements of your application. Consider the type of transmitter, accuracy, output signal, environmental conditions, interfaces, safety requirements and overall cost. A well-chosen transmitter can not only improve measurement accuracy and reliability, but also minimize operating costs and maintenance.

Transmitters can be purchased from various suppliers. Comprehensive information about manufacturers and suppliers of Transmitters from all over the world can be found on Exportpages.