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DIN Rail Multi-Channel Isolators | Input Loop Powered
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The DRI-LPI Series are DIN rail mount, loop-powered
isolators with single (DRI-LPI-MA), dual (DRI-LPI-2MA)
or quad (4) channel (DRI-LPI-4MA) capability. Each
channel accepts a 0 to 20 mA or 4 to 20 mA input
and outputs a proportional 0 to 20 mA or 4 to 20 mA
signal. The DRI LPI Series provides 1800 Vdc signal
isolation from input to output and channel to channel.
All DRI-LPI Series modules feature plug-in screw
terminals for easy installation and low Mean-Time-
To-Repair (MTTR). Two or more modules can slide
together and interlock for solid, high density mounting.
This is accomplished by removing either the foot or the
adjacent unit’s faceplate (for right-hand side or lefthand
side mounting, respectively). The module to be
attached will easily slide on to the side of the mounted unit.
Loop-powered isolators are used to isolate process
signals transmitted between field instrumentation,
programmable logic controllers (PLC), distributed
control systems (DCS) and data acquisition systems
(DAS). Outputs from these systems can also drive
one or more isolator channels of the DRI-LPI Series.
Field devices such as flow, level or temperature
transmitters can also drive a DRI-LPI Series isolator
channel. The 1800 Vdc isolation capability prevents
ground loops from causing errors in 4 to 20 mA
current signals and can reduce susceptibility to radio
frequency interference (RFI). Isolation also provides
protection from high voltages and current spikes which
can damage expensive supervisory control and data
acquisition (SCADA) equipment, such as a PLC or DCS.
The DRI-LPI Series operates as a loop-powered
isolator, with each channel deriving its power from
the input loop current, 0 to 20 mA or 4 to 20 mA. The
effective load of a DRI-LPI Series isolator channel on
a loop is 300 Ω plus the output load resistance. For
example, if the load on an output of the DRI-LPI Series
is 500 Ω, then the current loop connected to the input
would need to drive 300 Ω plus 500 Ω (i.e. 800 Ω) at a
maximum current of 20 mA, or 800 Ω x 20 mA which
equals 16.0V.
The DRI-LPI Series is protected from reverse input
polarity and output short circuit. A span pot is provided
for each channel in order to calibrate the output to the
load.
Specifications
Number of Channels:
DRI-LPI-MA: 1 channel
DRI-LPI-2MA: 2 channel
DRI-LPI-4MA: 4 channel
INPUT
Range: 0 to 20 mA, 4 to 20 mA; 30 Vdc max each channel
Voltage Drop: 6V (300 Ω), plus output load
OUTPUT
Range: 0 to 20 mA, 4 to 20 mA
Drive: 10V or 500 Ω max @ 20 mA, 100 Ω minimum
Output Accuracy: Better than ±0.2% of full-scale, including linearity, hysteresis and repeatability, maximum
Linearity: 0.1% of span typical, from 4 to 20 mA at 250 Ω load
Stability: ±0.02%/°C of span max for full-scale and zero
Load Regulation: ±0.1% of span, typical per 10 Ω change
Common Mode Rejection Ratio: > 100 dB (DC to 60 Hz)
Isolation: 1800 Vdc, input-to-output and channel-to-channel
ESD Susceptibility: Capable of meeting IEC 801-2 level 3 (8 kV)
Response Time: 50 msec typical, 100 msec max (10 to 90%, each channel)
Temperature:
Operating: -40 to 80°C (-40 to 176°F)
Storage: -40 to 80°C (-40 to 176°F)
Humidity (Non-Condensing): 25 to 95% RH @ 40°C (104°F)
Wire Terminals: Socketed screw terminals for 12 to 22 AWG
Weight: 154 g (0.34 lb)
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† All dollar amounts on this site are shown in US currency.
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