Measuring tasks with modular measured value acquisition
The modular data acquisition system enables precise and flexible data acquisition for a wide range of technical applications. By combining individual measurement modules, each of which has an individual number of analog and digital IOs, the system offers a high degree of adaptability and efficiency.
What advantages does modular data acquisition with Delphin offer you?
- Individual customizability: Thanks to the intelligent master-slave concept, it is freely scalable and can be adapted precisely to the requirements of the respective measuring task, from a few to 1,000 channels in one system.
- High flexibility in module selection: Various I/O modules are available to enable solutions tailored precisely to specific sensors and applications.
- Self-sufficient operation: Equipped with an internal data memory, the system can carry out measurements independently of a PC connection and store data securely.
- Integrated signal processing: Comprehensive monitoring, control and calculation functions ensure automated, precise evaluation of the recorded data.
- Reliable communication: A robust two-wire bus system and Ethernet connection guarantee fast and reliable data transmission, even in distributed systems.
- Expandability and future-proofing: The modular system can be flexibly expanded to integrate future requirements or additional measured variables without making fundamental system changes.
- Compact and space-saving design: The devices are compact and require little space, making them easy to integrate into existing systems.
- High data security: Thanks to the internal memory, measurement data is retained even during communication interruptions, ensuring fail-safe data acquisition.
Frequently Asked Questions About Modular and Galvanically Isolated Measurement Data Acquisition
Which modular measurement data acquisition systems offer galvanic isolation on all channels?
The ProfiMessage D device Delphin is a modular measurement data acquisition system whose inputs and outputs are differential and electrically isolated . The isolation applies between the devices and from the supply voltage. The system consists of master and slave devices with interchangeable I/O modules and can be adapted to the measurement task.
- Channel separation: The ADGT module (8 channels) isolates the analog inputs from one another with 650 V. For the ADVT, AAST, and ADIT modules, the isolation voltage is 110 V. The modules are isolated from the system with 400 VDC (ADGT) or 750 VDC. Digital inputs and outputs are isolated by 2.5 kV.
- Without external splitter amplifiers: Voltages, currents, thermocouples, and Pt100/Pt1000 sensors can be connected directly. The converters operate at 24 bits (sigma-delta).
- Scalable: Each master or slave device can accommodate up to two I/O modules. Up to 20 slave devices can be connected to a master via a two-wire expansion bus, either centrally or distributed.
- Self-sufficient: With 32 GB of internal memory, it can record data even without a PC. Interfaces include LAN, USB, RS-232/485, PROFINET, PROFIBUS, CAN, Modbus, and OPC UA.
- Practical example: A home appliance manufacturer conducts measurements in its development laboratory on 160 galvanically isolated channels, distributed across ten test stations.
Which data acquisition systems are suitable for precise temperature measurement using resistance sensors and thermocouples?
Delphin offers two systems for this purpose. ProfiMessage D Supports thermocouples, Pt100, and Pt1000 with galvanically isolated 24-bit inputs. The KTM multichannel temperature meter, with 16 to 64 channels, measures exclusively thermocouples, typically with an accuracy of 0.2 K.
ProfiMessage D (modular, mixed sensors)
- Sensors: Pt100 and Pt1000 resistance temperature sensors with a 4-wire connection, as well as all common thermocouples, and mV, V, and mA signals. See the technical data for a list of modules that support Pt100 (the ADVT, for example, does not).
- Pt100 Accuracy: 0.10 °C to 147 °C, 0.20 °C to 596 °C, 0.43 °C to 849 °C.
- Pt1000 Accuracy: 0.10 °C to 64 °C, 0.15 °C to 408 °C, 0.35 °C to 849 °C.
- Accuracy of Thermocouples: 0.1 % of the measurement range after sensor compensation. For negative temperatures, Delphin recommends calibration at the operating point.
Delphin KTM (multichannel, thermocouples)
- Channels: 16, 32, 48, or 64. More channels are possible via CAN bus with additional expansion modules.
- Types of Thermocouples: B, C, E, J, K, L, N, R, S, T, U.
- Accuracy: Typically 0.2 K absolute. Each thermoblock has built-in cold-junction compensation with a 4-wire Pt100 (Class A).
- Recording: The thermoelectric voltage is converted to °C inside the device; no transducer is required. The 14 GB memory is sufficient for about 70 days.
- Practical example: On the large turbine test stand, approximately 3,000 temperature readings are recorded using thermocouples and high-precision resistance temperature detectors.
Thanks to their flexibility and adaptability, our DAQ devices for modular data acquisition offer the advantage that they can be configured and expanded depending on the application. Typical areas of application are
- 4-channel measurement systems
- Modular measurement system at test stands
- Alarm systems
- Monitoring systems
- Temperature measurement systems
- Independent modular monitoring applications
Practical example of modular measured value acquisition
Dispersed measurement in photovoltaic field trials
At a solar institute, panels from the photovoltaic sector are measured with a ProfiMessage on distributed test systems. In addition to DC voltage measurements, temperatures, radiation and weather data are recorded. The connection to the campus network is made via LAN. In order to bridge short-term outages of the LAN network, the ProfiMessage-master stores all measured values, including those from the connected slaves, in the internal memory. Data loss, especially in the case of long-term measurements, is thus reliably ruled out. The data is evaluated using ProfiSignal and scientific analysis software, which is connected online to the ProfiMessage measuring system via a driver.