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3185
 
 

3185

 

Loop powered isolator

 

  • 1 or 2 channel input loop powered isolator
  • Signal 1:1 functional range 0...23 mA
  • Low input voltage drop and fast response time
  • Excellent accuracy and high load stability
  • Slimline 6 mm housing
  1. Overview +

  2. Technical details +

  3. Accessories +


Application

  • 1:1 input loop powered isolator of current signals in the range 0(4)...20 mA.
  • 3185 is an easy mounting DIN rail unit.
  • A very competitive choice in terms of both price and technology for galvanic isolation of current signals.
  • Provides surge suppression and protects control systems from transients and noise.
  • 3185 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

  • 3185 is powered by the analog input current signal loop.
  • Low input voltage drop, typ 1.35 V + Vout.
  • Excellent conversion accuracy, better than 0.1% in the range 0…20.5 mA.
  • Functional range is 0...23 mA which means that 3185 is NAMUR NE43 compliant.
  • Inputs and outputs are floating and galvanically separated.
  • The output is voltage limited to 17.5 VDC.
  • High galvanic isolation of 2.5 kVAC.
  • Fast response time < 5 ms.
  • Excellent signal/noise ratio > 60 dB.

Mounting / installation / programming

  • DIN rail mounting with up to 330 channels per meter.
  • Temperature operation range is from -25...+70°C.

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

Power dissipation, per channel 30 mW

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
Signal dynamics, input Analog signal chain
Signal dynamics, output Analog signal chain
Accuracy Better than 0.1%
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 0...23 mA
Input voltage drop (Unit voltage drop) + Vout.
Signal conversion 1:1
Start-up current, typ. 10 uA
Current input overload, max. 50 mA
Input to output voltage drop, typ. 1.35 V + (0.015 x Vout.)

Output specifications

Current output

Signal range 0...23 mA
Load (@ current output) ≤ 600 Ω
Load stability < 0.01% of span / 100 Ω
Voltage limit 17.5 V
of span = 0...20 mA

I.S. / Ex marking

ATEX II 3 G Ex nA IIC T4 Gc
IECEx Ex nA IIC T4 Gc
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

Approvals

ATEX 2014/34/EU KEMA 10ATEX0147 X
IECEx KEM 10.0068X
FM FM17US0004X / FM17CA0003X
DNV-GL Marine Stand. f. Certific. No. 2.4
UL UL 61010-1
CCOE P337347/1
EAC Ex TR-CU 012/2011 RU C-DK.GB08.V.00410
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