Pulse signal
Thread Content
There is a signal flow in which pulse signals from the field are transmitted to the DCS. How can one determine whether there are issues with these pulse signals, and how can such problems be identified? Additionally, is the supply voltage for these pulse signals 24V?
In principle, this signal is a digital signal and can be measured using a frequency analyzer; the power supply for this pulse signal is not necessarily 24V – it can also be 220V AC.
The pulse output signal of a meter can be either direct current or alternating current. Although the pulse signal is a direct current signal that lasts for a short period of time, the power supply is merely used to provide the energy necessary for the transmission of this signal.
For pulse signals used to measure flow rate, is it sufficient to simply detect whether there is flow or not, without caring about the accuracy of the flow rate?
Why choose a pulse signal? ? ?
Many instruments come equipped with both 4-20mA HART and pulse outputs; it depends on whether this functionality was included during the initial selection. If it is available, you can switch to a HART output, which facilitates fault detection and maintenance