How to choose the right pressure transmitter or level meter?
Considerations include measurement range, medium (type, temperature, viscosity, corrosivity), process pressure, accuracy requirements, output signal (4-20mA, HART, etc.), protection level (IP/NEMA), and explosion-proof certification.
What is the typical accuracy of these instruments?
Accuracy varies by model and range. Standard units usually offer specifications such as ± 0.1%FS or ± 0.075%FS. Always refer to the specific product data sheet for marked technical specifications.
What are the key points for correct installation?
For transmitters, ensure correct tapping points and grounding. For level gauges, avoid feed ports and obstacles, ensure proper sealing, and set tank parameters like dielectric constant and density correctly.
How is zero point and range calibration performed?
Most devices support local button calibration or remote HART/Fieldbus software. Zero point calibration is done at known reference points, while range calibration often requires a standard pressure source.
Which communication protocols are supported?
Common supported protocols include HART (superimposed on 4-20mA), Profibus PA, and Modbus RTU/TCP. Protocol support depends on the specific model configuration.
What maintenance is required for these instruments?
Regular inspections of appearance, seals, electrical connections, and sensor diaphragms are recommended. Cleaning the sensor/antenna and performing periodic zero-drift checks ensure long-term stability.