OMNITERM LPI & LPD Loop Powered Isolators Model C2063B LPI (single) & C2462A LPD (dual) 4-20mA Loop Powered Isolators Isolate any instrument current loop to 1500Vac Powered by the current loop - no power supply required Lowest volt drop <3 Volts at 20 mA (2,5V Typical) Load independent – no field calibration ever required High 1kohm load capability High 0.1% Accuracy High 11.25mm per channel packing density Reverse polarity and overload protection Unique internal clamp can protect against open circuit. Internal 250 ohm resistor for 1-5V input to PLC’s etc. Easy DIN rail or surface mounting The OMNITERM LPI and LPD are loop powered isolating current repeaters specifically designed to isolate instrument current loops from circulating ground currents that can cause system inaccuracies, or at worst, instrument failure. Insert in any 4-20mA current loop to isolate the instruments in the loop. The current applied to the input is repeated on the isolated output, and the load present on the output is reflected back to the input. No separate power source is required. Forming part of OMNIFLEX’s extensive OMNITERM range of signal conditioning and signal isolation products, the OMNITERM LPI and LPD are designed to be DIN rail or surface mounted. The Omniterm LPI is a single loop isolator in a 22.5mm wide DIN rail mount housing with extensive additional connection features, while the LPD is a dual loop isolator that fits two separate channels into the same 22.5mm width for high density applications. These second-generation products utilise advanced electronic techniques to achieve high accuracy with minimum loop losses and zero field calibration. Because of the faithful nature in which the output impedance is reflected back to the input, an open circuit on the output will cause an open circuit on the input. In cases where this is undesirable, an internal clamp is provided in the LPI model which, when connected, ensures that the current loop is not broken if the load is disconnected, such as unplugging the input terminations of a PLC or RTU. In many applications there is a need to convert the 4-20mA into 15Volts for an RTU, PLC or DCS etc. This is normally inconvenient because the precision resistor needs to be sourced, mounted and wired independently without causing loop errors. To overcome this obstacle, the LPI version also includes a precision 250ohm resistor that can be connected into the circuit to convert the output into 1-5V within the module. The LPI and LPD operate over 0-50mA range, allowing fault current levels to be repeated. Applications Isolate instruments in the same current loop Prevent ground loops and eliminate loop errors Isolate RTU’s, PLC’s, SCADA I/O from the field loop. Isolate two-wire transmitter loops from local 24Volts Isolate grounded chart recorders from the field loop Isolate grounded control valves from the transmitter Can be used with two-wire or four-wire transmitters Isolate and convert two wire field devices to 1-5V Mechanical Details Copyright Omniflex ♦ Subject to change without notice

OMNITERM LPI & LPD Loop Powered Isolators Model C2063B LPI (single) & C2462A LPD (dual) 4-20mA Loop Powered Isolators Connection Diagram C o n n e c t to 0 V fo r 1 -5 V o n IN Terminal Configuration of Omniterm LPI (Model C2063B) [NB: Note terminal numbering is out of order to be backward compatible with the model C2063] Terminal Configuration of Omniterm LPD (Model C2462A) Specifications Input Operating Current Range Absolute maximum current range Input voltage Maximum volt drop in loop Isolation Test Voltage Max. equivalent insertion loop resistance -20 to +70°C 0 to +60°C 1500Vrms Input to...

OMNITERM LPI & LPD Loop Powered Isolators Model C2063B LPI (single) & C2462A LPD (dual) 4-20mA Loop Powered Isolators Application Examples Application 1: Using the LPI to isolate a powered 4-20mA transmitter output from a resistive load This is the basic circuit for inserting a Loop Powered Isolator (LPI) into a current loop. The LPI can simply be “cut” into any existing current loop to isolate the current transmitter from the load. NOTE: The “IN” side of the LPI is always connected to the side of the loop supplying the loop power. The LPI will consume less than 3 Volts of the available loop...

OMNITERM LPI & LPD Loop Powered Isolators Model C2063B LPI (single) & C2462A LPD (dual) 4-20mA Loop Powered Isolators Application 2: Using the LPI to isolate a field mounted 4-20mA two-wire transmitter from a PLC, RTU or DCS Loop Powered Two-wire Transmitter This is the basic circuit for isolating a field-mounted two-wire transmitter from the control circuitry using an LPI. The LPI can simply be “cut” into any existing two-wire current loop to isolate the transmitter from the panel power supply. NOTE: The “IN” side of the LPI is always connected to the side of the loop supplying the loop power,...

OMNITERM LPI & LPD Loop Powered Isolators Model C2063B LPI (single) & C2462A LPD (dual) 4-20mA Loop Powered Isolators Application 3: Using the LPI’s internal resistor with a 2 wire transmitter to provide 1-5V to a PLC/RTU/DCS Loop Powered Two-wire Transmitter There are many cases when using 4-20mA inputs to your PLC or RTU or DCS is inconvenient. For example: 1. Your analogue input does not support 4-20mA, and mounting an external resistor is inconvenient. 2. Your analogue input has plug in terminals, and you do not want to lose power to your field transmitter or disrupt the loop if the terminal...

OMNITERM LPI & LPD Loop Powered Isolators Model C2063B LPI (single) & C2462A LPD (dual) 4-20mA Loop Powered Isolators Application 4: Using the LPI’s internal resistor with a 4 wire transmitter to provide 1-5V to a PLC/RTU/DCS There are many cases when using 4-20mA inputs to your PLC or RTU or DCS is inconvenient. For example: 1. Your analogue input does not support 4-20mA, and mounting an external resistor to convert the signal to 1-5V is inconvenient. 2. Your analogue input has plug in terminals, and you do not want to lose power to your field transmitter or disrupt the loop if the terminals...