Application; Description; Technical Characteristics; Input - PR electronics 2284 Mode D'emploi

ISOLATION AMPLIFIER 2284
• Galvanically separated input, output, and supply
• Bipolar current / voltage input
• Signal conversion
• Current and voltage output
• 24 VDC or universally supplied
• Applicable in PELV/SELV circuits

APPLICATION:

Galvanic separation of analogue signals (ground loop elimination).
Measurement of floating signals.
Signal conversion within the ranges: -250...+250 VDC or -50...+50 mA on the
input and 0...10 (20) VDC and 0...20 mA on the output.

DESCRIPTION:

The 2284 uses microprocessor technology for the selection of gain and zero
offset, yet the signal processing is analogue with a fast response time of less
than 25 ms.

TECHNICAL CHARACTERISTICS:

In standard ranges, the 2284 is programmable within the input and output ranges
using internal DIP-switches.
Provided that the front adjustments are still sealed, the unit needs no readjustment
after programming.
The unit is galvanically separated between input, supply, and output.

INPUT:

Current or voltage in standard or special ranges within the measurement range.
The programming schedule shows the standard ranges. Nominal standard input
resistance is 50  for mA signals. The 2284 has a 2-wire transmitter supply and
a reference voltage of 2.5 VDC, max. 15 mA for short circuit-protected supply of
potentiometers.

OUTPUT:

The output can be ordered for standard or special currents and voltages within
the signal range.
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Standard current output (pin 3) 0/4...20 mA, and 0/1...5 mA acc. to the
programming schedule with the possibility of signal reversal.
Current limit: 23...28 mA.
Standard voltage output (pin 2) is achieved by short-circuiting pins 2 and 3.
The voltage signal is available between pins 2 and 1.
For voltage signals in the range 0...1 VDC, a 50  shunt (DP 2-1) is applied; in the
range 0...10 VDC, a 500 shunt (DP 2-2) is applied.
Using both signals simultaneously, the mA-loop to ground must go through the
internal shunt.
The 2284 is available with a buffered voltage output, 0...20 V 10 mA. The current
output cannot be used simultaneously. In applications where the output must sink
current, the following min. voltages on the output can be achieved:
At 100 µA; 10 mV, and at 1 mA; 90 mV.
Fine adjustment of 0 and 100% values for special ranges is possible at the front
±2.5%, but please note that the basic calibration is thereby lost.

ELECTRICAL SPECIFICATIONS:

Specifications range:
-20°C to +60°C
Common specifications:
Supply voltage, DC ..................................... 19.2...28.8 VDC
Universal supply, voltage ............................ 21,6...253 VAC, 50...60 Hz
Max. consumption 2284--D, (24 VDC) ........  2.4 W
Max. consumption 2284--P (uni. sup.)........  2.5 W
Isolation, test / operation ............................ 3.75 kVAC / 250 VAC
Signal / noise ratio ...................................... Min. 60 dB
Response time (0...90%) ............................. < 25 ms
Temperature coefficient ............................... < ±0,01% of span / °C
Linearity error .............................................. < ±0,1% of span
Effect of supply voltage change.................. < ±0.005% of span / V
2-wire transmitter supply (pin 7...5) ............ 19...28 VDC / 20...0 mA
Reference voltage ....................................... 2.5 VDC ±0.5%, 15 mA
EMC immunity influence ............................ < ±0,5% of span
19,2...300 VDC
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