Power supply for pH meter circuit?
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Are most pH meters available on the market powered by a loop supply? It means that the pH probe can be connected directly to the AI card without the need for an intermediate transmitter, just like two-wire instruments such as pressure transmitters and temperature transmitters
Yes, most pH meters available on the market today support loop power supply, that is, they use a two-wire connection method that allows the pH probe to be connected directly to the analog input card, without the need for an additional measuring instrument. This method is similar to the wiring method of pressure transmitters or temperature transmitters. .
They have independent power supply (24VDC or 220VAC); in these cases, the pH probe and transmitter convert the signal into a current signal, which is then sent to the DCS card.
This post was last edited by qqgd on 2024-10-22 at 15:43. The vast majority of pH meters consist of a pH sensing probe and a pH transmitter or controller, which are connected using a dedicated pH sensor cable. As for the power supply method, it can be two-wire or four-wire. The online pH analyzer mentioned by the poster is a detector that does not have a display screen; it usually adopts a digital detector or probe design, and can be used by being connected to the cards in the control system through dedicated two-wire or multi-wire cables. This type of detector is used less frequently, as on-site calibration and adjustment have certain limitations, and many users are not receptive to this approach. Previously, Hash Company and some foreign companies had similar products, but their use and sales in China were so low that production was essentially halted. Currently, similar products are available in China as well; Hebei Koreda seems to have such a product.