What are the output signals of the thermal air mass flowmeter?

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In addition to the parameters of the instrument itself, the output signal is also of concern to users. The output signals applicable to various scenarios are also different. Regarding the output signals of thermal air mass flow meters, each has its own advantages. The following is a brief introduction to each signal type:

Current signal (such as 4-20mA) This is the standard output signal:

1. Strong anti-interference: Since the internal resistance of the current source is very high, it is not sensitive to changes in external resistance and is suitable for long-distance transmission.

2. Strong load capacity: it can drive certain loads, such as indicating instruments, recorders or control equipment.

3. High safety: When the line is disconnected, the current is zero, which provides a fault detection mechanism.

Digital communication interface (such as RS485):

1. Remote monitoring: supports remote data collection and analysis, facilitating centralized management and maintenance.

2. Good data integrity: Digital signals have stronger anti-interference ability and can ensure the accuracy of data.

3. High compatibility: Can connect and communicate with a variety of devices through various protocols.

HART protocol:

1. Compatible with analog signals: can be upgraded to digital communication while maintaining the existing analog system.

2. Provide diagnostic information: In addition to basic flow measurement, additional parameters such as sensor status and calibration information can also be provided.

3. Flexible configuration: supports remote configuration and debugging of field devices.

The choice of which output signal depends on the specific application environment, existing control system requirements, and user needs for data processing and communication.