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sixpac
Participant

Join Date: Jan 2007
Posts: 4

BLACK BOX DISPLAY BOARD

05/24/2007 7:38 PM

looking for BLACK BOX that will divide a 4-20 ma signal input into 2 seprate 4-20 ma signals one to record trend data and the other to controll a 5 decmel 7 segament display board what we have is a weigh belt controlling line flow pounds per hour our boss wants to see the pounds per hour on a display board exp. 40,000 PPH we only have one spare 4-20 ma output that we use for our historgram graf is there a black box that will modify the 4-20 to run both outputs and the display board?
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Bolton_Alan
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United Kingdom - Member - Member

Join Date: Mar 2007
Location: Blackburn, Lancashire
Posts: 269
Good Answers: 9
#1

Re: BLACK BOX DISPLAY BOARD

05/25/2007 7:05 AM

Here have three

http://www.laurels.com/tls.htm

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Vulcan
Guru
Philippines - Member - New Member Engineering Fields - Instrumentation Engineering - New Member Engineering Fields - Control Engineering - Who am I?

Join Date: Oct 2006
Location: Northern Mindanao, Philippines
Posts: 2147
Good Answers: 53
#2

Re: BLACK BOX DISPLAY BOARD

05/25/2007 8:07 AM

Most 4 to 20mA transmitters can comfortably handle two loads. All you have to do is to connect them in series. In most of the transmitters I've used, they specify the resistance that the current loop can handle, which is usually 1000Ω. Most loads are 250Ω so this should not be a problem.

However, not all things are built to the same specs. My suggestion is that you first try connecting your trend input and your digital display in series with your 4 to 20mA signal to see if it will work. It it doesn't, then go ahead and purchase a repeater.

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