Regarding the remote monitoring of flow meters used for measurement, the issue of reading flow rates
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The company currently has a steam flow meter dedicated to external settlements, and it now wishes to read its flow value remotely. Is there any good way? It is not considered to connect this table to the DCS system due to the great distance.
For remote reading, I think there are two ways to achieve this: one is to perform remote operations on the DSC, and the other is to have the instrument itself equipped with a DTU for transmission. This is an informal answer; please forgive any inaccuracies.
For longer distances, a flow meter equipped with a communication interface should be used, so that data can be transmitted via communication.
A flow integrator certainly cannot replace a flow meter; it is used to calculate the cumulative flow, can display the instantaneous flow, and comes equipped with an output function. The other party’s suggestion cannot be accepted; the output method you actually need is not provided by the flow accumulator.
Wireless HART transmission; read once when needed. . .
Many flow meters these days come equipped with communication interfaces, typically RS485 and pulse output communication; RS485 can be used for both wired and wireless connections； For transmitting DCS, pulse signals can be acquired using a pulse data acquisition card.
I misinterpreted your request; wireless Hart isn’t the key factor here – it’s the method of reception that matters. If you don’t want to connect to the system and instead just want to view the traffic data, there are two options: 1. Use a remote display unit, and have the instrument send the data to that unit via any suitable transmission signal; of course, this method isn’t very effective for long distances. 2. Choose a flow meter similar to the E+H W800 series, one equipped with a GPRS card, which allows sending commands via a smartphone to read either the instantaneous flow rate or the cumulative volume as needed.
We are currently using a GPRS DTU; the meter needs to have an RS485 or RS232 output to connect to the DTU, and data is sent via a SIM card (with GPRS enabled), while it is received on-site using a computer with broadband connection
For this, you can find specialized manufacturers that produce modules for converting Hart/Modbus signals into GPRS signals; our company uses such modules in many meters installed in water supply network systems.
How far can it be? If you don’t use DCS, do you have to rely on wireless transmission? For wireless, it’s possible to use the second method mentioned by someone on the seventh floor; I’ve seen that done before. Send commands via mobile phone. Another option is Rosemount’s wireless transmitters; the instrument can output flow signals directly. For longer distances, remote transmission can be achieved by adding repeaters, and the final data can be viewed at any time using a computer via IE.