Here is the wiring diagram for the meter I am trying to use. Please note that it is a 24volt DC. So I have a resistor installed in the second picture attached. It calls for a 249 Ohm resistor but all I had was a 270 so I had to use that.
The problem I am having is when I plug in the PR33-7 the relay on my breadboard gets super hot, like fry an egg hot. Ugh.
I have the pull-up resistors in place on the PR33-7
Should I have bought the PR33-26 instead so I can eliminate the need for the resistor?
the board already comes with on board power and all other parts.
All you will need to do is plug the 2 wire sensor into the 4-20mA current loop board and it will power up the sensor as well as read it.
External power will damage the receiver.
PR33-26 is transmitter not receiver.
If you want to use an external power you will need to get this controller
Thats what I am trying to do. I have it wire just like the picture above shows. From “MA-” to “dislpay-” I am not trying to power the sensor. If I read the jumpers I am showing a voltage range of 1.08V - 5.4V going to the PR33. Now if I plug in the particle and measure voltage coming out of the PR33 it reads 12 volts.
Its an air flow meter model 5200. it is not listed in any of the popular forums as it is used more in industrial settings. The image I posted was from them on how to wire to a 4-20ma data logger.
You can connect this sensor directly to the 4-20mA board. You wont need the 249Ohm resistor and external power. the 4-20mA board will take care of everything.
Thank you so much. Just to confirm that I can connect this sensor, that is powered by 24volts DC to the PR33-7 board. I want to make sure I don’t fry anything. Lol.
You dont need to power up the sensor using 24V, the 4-20mA will power the sensor.
feel free to post a picture of you setup/wiring before powering it up.
Hello,
I wired like you said. I tried measuring the mA with the meter but the meter is showing 0 when put on the leads coming out of the flow meter, regardless of the flow change in the meter. It is also showing 0 in the particle console.
If I measure the voltage without the PR33 attached it measures 0.01, When I attach the PR33 I get 16.24 volts.
you will need to remove the wire jumper between mA+ and DC+. if you dont do that the flow meter will supply power to the 4-20mA Board and will damage the 4-20mA board.
connect the 4-20mA board wires between mA+ and mA-.
Thank you, I had removed it right after I took this picture. I am still not getting a reading. Is there a procedure for testing the board to confirm if it is still working and that I did not grenade it?
Never mind the last question. I downloaded the mac serial tool and found my I2C channel was 0x49 instead of 0x48 which is listed in the ads1115.h file. The serial tool showed me that I did not blow up the amazing parts that I bought from your company. Thank you for all the help. Now I just need to figure out how to convert the mA readings into CFM. lol. You all are the best. Thank you again for helping this noob out. I really appreciate the support.