Wireless Transmitter Project

Projects General Guidance
1

Dear All,

I am doing the feasibility study for retrofiting my existing monitoring system which currently working in wire based system to wireless system.

my existing system comprises of:

  • 5 pressure transmitter Rosemount 3051 which working in 24 VDC power and 4-20 mA output
  • 1 data acquisition PLC with 8 channel analog input (3 channel for spare)
  • 1 PC for monitoring software.

each of pressure transmitter located in different place (about 10 meter difference) and connect to PLC analog input using 1 sqmm cable.

I plan to modify my wired based pressure transmitter become wireless pressure transmitter by adding a 4-20 mA shield and zigbee shield then send it wirelessly to our monitoring station. I try to find a product in the internet which match with my requirement and i found on Digi website (http://www.digi.com/products/wireless-modems-peripherals/wireless-range-extenders-peripherals/xbee-zb-adapters). This product price is around USD150. In my case, i have to buy 5 items for each of my pressure transmitter and my project budget is not that much. ( i know this product gives some input channels, but due to my system topology, we need 1 product for 1 pressure transmitter)

So i would like to hear any other idea or opinion for the lower cost solution. Thank you very much.

2

As no one else has replied ...

The link you posted just seems to be a expensive XBee device.
This is only a small part of the system.

If you are looking at an Arduino solution, I think your main consideration would be how to interface your existing sensors, to the Arduino.
i.e The Arduino UNO has 6 analogue inputs that are 12 bits and input values 0 to 5V.
11 digital IO (i.e D2 to D13) (TTL 5V)