The 4-20mA output signal and DC power share a common lead which is wired directly to the PLC/DCS’s internal ground. These models are used to drive resistive loads (sources current). Power is received from the input signal current.ĭT236: Two Wire Transmitter that isolates and converts DC Current or low voltage into 4-20mA The 270i accepts a process current input and provides an isolated 4 to 20mA process current output signal. 1500V AC peak isolation DC prevents ground loops.These models convert sensor inputs to proportional process current or voltage output signals. These units receive 4-20mA process current inputs and provide isolated 4-20mA output signals.įlat Pack Series: 2 Wire Loop Powered 4-20mA Isolators, DIN Rail MountĭT236 Current/Millivolt Input 2 Wire Transmitter Up to four independent channels in a single unit with channel-to-channel isolation.Each channel operates independently.Ħ71T / 672T / 674T: Isolator, Single/Dual/Quad Channel These units receive 4-20mA process current inputs and provide isolated 4-20mA output signals. Up to two independent channels in a single unit with channel-to-channel isolation.The TT236 model is a space-saving two-wire transmitter that isolates and converts a DC current or low voltage input to a proportional 4-20mA control signalĦ51T / 652T: Isolator, Single/Dual Channel
Transmitter/Isolator, Current/Millivolt Input, Loop-Powered TT 230 Series: 2 Wire Loop Powered 4-20mA Isolators, Rail MountĦ00 Series: 2 Wire Loop Powered 4-20mA Isolators, DIN Rail Mount The isolator’s output is powered by the input loop power and drives passive loads only.
When adding a field device such as a recorder or display, no additional power source is required for the added loop or for the isolator. Since both the input and output signal are 4-20mA, location of the device is not critical.Ħ70T and 270i models are useful when adding and isolating a monitoring instrument to an existing current loop. Usually, the isolator is located close to the field device. Since output and power share the same two wires, this type of isolator can be placed anywhere between the field sensing device and the PLC/DCS or monitoring device. The isolator must control current draw from the power supply in the output loop which is the 4-20mA signal.
#SIGNAL ISOLATOR FOR DC DRIVE SERIES#
Typical uses are as a current repeater or to drive resistive loadsĦ51T and 250T models are ideal for applications that require an isolator with a power supply in series with the output signal. Models get power from the 4-20mA output or input loop (sinks or sources current).
#SIGNAL ISOLATOR FOR DC DRIVE HOW TO#
Or to learn how to choose the right isolator for your application – check out this blog titled “Selecting the right signal isolator” 4-20mA Loop Powered Isolators, 2 Wire They are safest for retrofitting or expanding systems where instrument isolation or the grounding schemes are unknown.įor more information on the different signal isolators 4-20mA please see below or contact us. The 4-20mA output signal and DC power share a common lead which is wired directly to the PLC/DCS’s internal ground.Ĥ-Wire AC/DC-Powered 4-20mA Isolators – These isolators provide 3-way isolation to separate input, output, and power circuits. Typical uses are as a current repeater or to drive resistive loads.ĭC-Powered Isolators – These models are used to drive resistive loads (sources current). There are several different types to choose from:Ĥ-20mA Loop-Powered Isolators, 2-Wire Models get power from the 4-20mA output or input loop (sinks or sources current). Acromag manufactures 4-20mA Signal Isolators.
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