Hello, please to which components does the signal cables of flow meter connect?  - Page 1
Forum section: electronics / beginners

author: nyame
author_rank: Regular Contributor
timestamp: December 07, 2018, 02:04:24 pm
content: Hello, please to which components does the signal cables of flow meter connect?

author: retrolefty
author_rank: Super Contributor
timestamp: December 07, 2018, 02:18:17 pm
content: Not enough information provided to determine a correct answer. Looks like there are 4 measurement loops available for more then just the flow measurement. A service/installation manual from the manufacture is essential to go further.

author: nyame
author_rank: Regular Contributor
timestamp: December 07, 2018, 02:28:37 pm
content: thanks for the reply. the manual does not give that much information about the wiring. but as a beginner, i would like to understand if signal wirring is to be connect to components such as valves or actuators!

author: retrolefty
author_rank: Super Contributor
timestamp: December 07, 2018, 03:32:56 pm
content: Quote from: nyame on December 07, 2018, 02:28:37 pmTypically field measurement loops wire to controller inputs while final control elements like valves or actuators wire to controller output loops. PLCs, DCS systems, or individual controller devices all work together for each specific process control objective. Its a specialty field and needs training/review of basic process control fundamentals to come before wiring up a system.

author: nyame
author_rank: Regular Contributor
timestamp: December 07, 2018, 04:32:11 pm
content: i get you right, but i have interest in know the basics.to the best of my understand i know those signal cables loops are 4 to 20mA that can be use to assess the measurement of the transmitter external.please someone should guild me more if am on the right channel

author: Karlo_Moharic
author_rank: Regular Contributor
timestamp: December 07, 2018, 08:38:18 pm
content: Your english is kinda bad , but I'm presuming that what you are asking is: How do we usually use a flow meter ?Well in most setups , flow meter in connected to some kind of microcontroller or computer that uses it's input to control a electromagnetic valve , which in turn controls flow of fluid through some system. You can also use flow meter to control preassure.You can also make a simple transistor logic circuit , using flow meter in your feedback loop in order to control a speed of a fluid.

author: nyame
author_rank: Regular Contributor
timestamp: December 07, 2018, 09:55:25 pm
content: Hi thanks for the reply.what i actually need to know, there are output signal terminals, now those terminal are label + and -, + and -, which i assume the output is 4 to 20mA for each of those terminals, is that signal output use to monitor the reading of the flow transmitter externally ?, can it be used to wire valves and actuators ?please find an example schematics below

author: Karlo_Moharic
author_rank: Regular Contributor
timestamp: December 07, 2018, 11:16:24 pm
content: OK , so after looking at pdf from yor original post and identifying component as Proline Promass 40E.Here are links to documentation regarding device.https://portal.endress.com/webapp/ProductContainerGUI/plain/downloads.jsp?root=40E&filter=010.040&lang=enhttps://portal.endress.com/wa001/dla/5000319/0459/000/06/TI00055DEN_1418.pdfSecond link is a datasheet for given flow meter. From there we can see that terminals 1 & 2 are your 120VAC connection.Further on we can see that device has 4 different output options:1) 4-20mA active (no extra power supply) current loop/supports HART protocol(google Highway Addressable Remote Transducer Protocol)2) 4-20mA passive current loop (need extra supply 18-30VDC)3) Continous freqency output4) Pulse outputAll outputs are galvanicly isolated (that is a good thing) , most likely by using opto-copulers.After reading datasheet , I have to say this is very capable device and there are many ways to implement this device in to a system.That is why there are so many different outputs.What you are asking about is system control implementation called Relay logic.With that being said , YES , you can use this device to control valves , preassure regulators or any other simillar device.You can achieve this by using HART protocol. By using valves and actuators that have build in HART (4-20mA loop) support.Outputs 26 & 27 are ones that you are interested in.Depending on a problem you are trying to solve you might be able to connect flow meter DIRECTLY to a preassure regulator or actuator , BUT also you may need to use PLC or a group of relays and/or timers to achieve proper regulation.FOR MORE DIRECT ANSWER please , tell us exactly what do you wish to do.Note also that in order to utilize HART protocol , device NEEDS to be configured.From operation manualhttps://portal.endress.com/wa001/dla/5000000/0371/000/02/BA062DEN_0908.pdf, we can see (page 5) that you need HART Communicator DXR 375 (stand alone unit)or Commubox FXA193 modem for a PC in order to do that.

author: nyame
author_rank: Regular Contributor
timestamp: December 08, 2018, 07:20:09 am
content: Thank you for the reply.( tell us exactly what do you wish to do), i which to gain the knowledge on how to wire and configure the transmitter, that is my main objective, there is no local training available in my area for this,thanks you for identifying the signal output terminals for me. (please the order of direction does it count from example (-27, +26 (1) 4-20mA active (no extra power supply) current loop/supports HART protocol, then the other continues from 2,3 and 4 which will then be-21 +20 ?

author: Karlo_Moharic
author_rank: Regular Contributor
timestamp: December 08, 2018, 08:57:38 am
content: https://portal.endress.com/wa001/dla/5000319/0459/000/06/TI00055DEN_1418.pdfOn page 6 of datasheet under Electrical connection , diagram shows you how terminals are numberdOn the same page under Terminal assigment you can see what are different terminals for.From left to right:Terminal 20 (this is +) & terminal 21 (this is -) are controller* input terminals -used to configure deviceTerminals 22(+)/23(-) are output terminals for controller*- they give information on what settings are currently active in a deviceTerminals 24(+)/25(-) are either frequency output or pulse output - you select which (if you need to use this) by using controller*Terminals 26(+)/27(-) are 4-20 loop outputs , either active (HART) or passive - you select which by using controller*Controller* gets connected to terminals 20/21 & 22/23.Relays , actuators , PLC-s , etc.. get connected to terminals 26/27Terminals 24/25 are for a custom solution using a non-standard comms protocol.*controller mentioned is HART Communicator DXR 375 or Commubox FXA193 modemIF you know default settings of a flow meter and they MATCH your needs then you don't need to use controller to setup device.Otherwise before usage , you will need to programm the device to suit your needs.How to configure device is coverd in operation manual:https://portal.endress.com/wa001/dla/5000000/0371/000/02/BA062DEN_0908.pdf