3186 2-wire transmitter isolator / current isolator

2-wire transmitter isolator / current isolator – 3186
Model: 3186
Make: PR Electronics
Origin: Denmark
  • 1 or 2 channel 2-wire transmitter isolator / current isolator
  • 1:1 conversion in the range 3.5…23 mA
  • Low channel voltage drop and fast response time < 5 ms
  • Excellent accuracy, better than 0.05%
  • Slimline 6 mm housing




  • 3186A is a 1:1 output loop-powered 2-wire transmitter isolator that excites and measures passive input signals.
  • 3186B is a 1:1 output loop-powered 2-wire current isolator that measures active input signals.
  • A very competitive choice in terms of both price and technology for galvanic isolation.
  • Provides surge suppression and protects control systems from transients and noise.
  • 3186 eliminates ground loops and can be used for measuring floating signals.
  • The device can be mounted in Safe area or in Zone 2 and Cl. 1 Div 2. area.

Technical characteristics

  • 3186 is powered by the host loop voltage.
  • Wide supply range from 6…35 V.
  • Low input to output voltage drop typ. 2.5 V (3186A).
  • Low input drop ≤ 3 V (3186B), even when no loop power is applied to the output terminals.
  • Excellent conversion accuracy, better than 0.05% in the range 3.8…20.5 mA.
  • Signal range is 3.5…23 mA which means that 3186 is NAMUR NE43 compliant.
  • Inputs and outputs are floating and galvanically separated.
  • High galvanic isolation of 2.5 kVAC.
  • Fast response time < 5 ms.
  • Excellent signal/noise ratio > 60 dB.

Mounting / installation

  • DIN rail mounting with up to 330 channels per meter.
  • Extended operating temperature range from -25…+70°C
SKU: N/A Category:
Weight 0.5 kg
Product Version:

A: 2-wire transmitter isolator, B: 2-wire current isolator


1: Single, 2: Double

Environmental Conditions

Operating temperature -25°C to +70°C
Storage temperature -40°C to +85°C
Calibration temperature 20…28°C
Relative humidity < 95% RH (non-cond.)
Protection degree IP20
Installation in Pollution degree 2 & measurement / overvoltage cat. II

Mechanical specifications

Dimensions (HxWxD) 113 x 6.1 x 115 mm
Weight approx. 70 g
DIN rail type DIN EN 60715/35 mm
Wire size 0.13 x 2.5 mm2 / AWG 26…12 stranded wire
Screw terminal torque 0.5 Nm
Vibration IEC 60068-2-6
2…25 Hz ±1.6 mm
25…100 Hz ±4 g

Common specifications


Supply voltage 6…35 VDC
Power dissipation, per channel 50 mW (3186A) Vterminal x I (3186B)

Isolation voltage

Isolation voltage, test / working 2.5 kVAC / 300 VAC (reinforced)
Zone 2 / Div. 2 250 VAC

Response time

Response time (0…90%, 100…10%) < 5 ms
Signal / noise ratio > 60 dB
Accuracy Better than 0.05%
Cut-off frequency (3 dB) 100 Hz
EMC immunity influence < ±0.5% of span
Extended EMC immunity: NAMUR NE21, A criterion, burst < ±1% of span

Input specifications

Current input

Measurement range 3.5…23 mA
Input to output voltage drop, typ. 2.5 V (3186A)
Input voltage drop typ.: Supplied and non-supplied unit ≤ 3 V (3186B)
2-wire transmitter supply 3.5…32.5 V
Signal conversion 1:1

Output specifications

Current output

Signal range 3.5…23 mA
Signal range, input to output 3.8…20.5 mA
Output loop current limitation, typ. 24 mA
Current output overload, max. 50 mA

I.S. / Ex marking

FMus Cl. I, Div. 2, Gp. A, B, C, D T4 or Cl. I, Zone 2, AEx nA IIC T4
FMca Cl. I, Div. 2, Gp. A, B, C, D T4 or Cl. I, Zone 2, Ex nA IIC T4

Observed authority requirements

EMC 2014/30/EU
LVD 2014/35/EU
RoHS 2011/65/EU
EAC TR-CU 020/2011


ATEX 2014/34/EU KEMA 10ATEX0147 X
IECEx KEM 10.0068X
FM FM17US0004X / FM17CA0003X
CCOE P337347/1 (Pending for 3186B)
EAC Ex TR-CU 012/2011 RU C-DK.GB08.V.00410 (Pending for 3186B)
DNV-GL Marine V1-7-2 (Pending for 3186B)
UL UL 61010-1

Data sheet