Wireless Transmitters

Here's some wireless instrumentation:

and here's a wireless control valve:

and here's a wireless P&ID loop housing doing some modulation according to a pre-programmed algorithm inside it:

One of the really nice things about internet searches is that a lot of pertinent information can be gleaned from a few carefully selected words. For instance, if I enter "wireless process control" into the main Google textbox and press <Enter>, I get this.

It's amazing. Really.

How did you do that????

Look here.

It sounds preposterous but this is more than a curious question

No it's quite common now days in certain applications.

Let me cogitate on the pertinent point:

1,. Engineers spend tons of time, to assure, that what they want, happens, and nothing else happens in the equipment under their control.

2,. Engineer spend tons of time on shielding, grounding, isolating. And testing and verifying the effectiveness of those.

3,. Then along comes a fellow, wanting to open up all that to an unprotected radio link.

I ask the OP, to list a half a dozen things, that can go wrong with the scheme, and its consequences. Before any meaningful conversation can take place, that is.

Wireless instruments and communication system can be used in non critical applications, but if there is any criticality due to the comm link failure than go the traditional route hard wiring.

Even though wireless has come a long way I myself would prefer to use hardwired where possible, you have on failure link less.

We are using wireless instrumentation for control purpose, it has been a pain.

The project leader selected wireless for cost saving purposes. I am user of the system and was not involved in the project. There was not enough previous analysis of the environment where it was installed, of the effect of the interference created by the equipment they choose, of the interference the equipment previously installed would cause in the new equipment, etc.

We have many communication loss issues, and a lot of noise and interference with other equipment, due to the location and the chosen equipment we have mayor issues with harmonics in the energy lines…

We are living this problems everyday because of a lack of good analysis in the beginning of the project. If you make a really good and in-depth analysis of your facility, what equipment you have, and what equipment you are going to buy you should not have mayor issues if you select the proper equipment. Wireless instrumentation is not always the best way to go.

If you use Wireless Instrument for control application It will be too costly, Battery failure is frequent.

hi,

Of course you can use a wireless adapter to the existing HART enabled field device to extract HART information and then transmitting it to DCS or direct enterprise level.

Below is the photo of an adapter which can be fitted to an existing device without disturbing its intended functionalities,

The WirelessHART Adapters can be connected directly to the cable gland entry of any conventional HART or 4 ... 20 mA field device. WirelessHART Adapters are battery powered. The adapter supplies power to itself, the connected field device, and provides maximum independence. The adapters operate continuously to provide the router functionality within the network. The field device is only powered when needed. Depending on power consumption, voltage requirements, measurement times, and intervals between measurements, battery life can last for years.

Below pitcure shows the HART Adapter with MESH Network

In a mesh network, devices (nodes) perform double-duty as repeaters to relay data from other

instruments to the gateway as needed. In other words, data transmitted from one WirelessHART

instrument may not be directly received by the gateway device if that path is blocked or too far

away. Instead, the data may "hop" from one device to another nearby, which then re-broadcasts

that information to the gateway via a clearer path.

The purpose of a mesh network is to provide redundant data pathways in case of device failure

or changes in the environment interrupting radio communication between devices. In this way, data

packets may be re-routed to the gateway if the shortest route fails, in a manner similar to how

Terminal Control Protocol (TCP) and Internet Protocol (IP) work together to route data segments

from source to destination over the "mesh" of the Internet. This feature is often referred to in

WirelessHART technical literature as the self-healing property of the mesh network.

According to the HART Foundation, reliability for a well-designed WirelessHART mesh network

is 99.7300204% minimum, and typically greater than 99.9999998%.

Sugessions are welcome.