Loop powered isolator
PR 3185
- 1 or 2 channel input loop-powered isolator
- Isolation and 1:1 conversion of standard current signals
- Excellent accuracy and high load stability
- Low input voltage drop and fast response time
- Slimline 6.1 mm housing
Functional highlights
- High 4-port isolation provides surge suppression that protects the control system from transients and noise and eliminates ground loops.
- The device can be mounted in Safe area or in Zone 2 / Division 2 areas and is approved for marine applications.
Technical highlights
- Low input voltage drop, typ. 1.35 V + Vout
- Excellent conversion accuracy, better than 0.1% in the range 0…20.5 mA.
- Fast response time < 5 ms.
- NAMUR NE21, NE43.
- Excellent signal/noise ratio > 60 dB.
- High galvanic isolation of 2.5 kVAC.
- Inputs and outputs are floating and galvanically separated.
- The output is voltage limited to 17.5 VDC.
- Wide ambient temperature range: -25...+70°C.
Mounting / installation
- The narrow 6.1 mm housing allows up to 163 units per meter.
- DIN rail mounting with up to 326 channels per meter.
- Units can be mounted side by side, horizontally and vertically, without air gap on a standard DIN rail, even at 70°C ambient temperature.
Data sheet & Manuals
Data sheet
- 3185.pdf
- Latest version
Manuals
- 3185V104_EN.pdf
- 3185V103_UK.pdf
- 3185V102_UK.pdf
- 3185V101_UK.pdf
- 3185V100_UK.pdf
- Previous versions
- Latest version
Manuals in Russian
- 3185V104_RU.pdf
- 3185V103_RU.pdf
- 3185V102_RU.pdf
- 3185V101_RU.pdf
- 3185V100_RU.pdf
- Previous versions
- Latest version
Approvals & Certificates
ATEX certificate
- 3185_issue12.pdf
- Latest version
IECEx certificate
- 3185IEC_issue 11.pdf
- Latest version
UKEX certificate
- 3185UKEX_Issue1.pdf
- Latest version
CCC certificate
- 3000_series_CCC_2025_12.pdf
- 3000_series_CCC_2024_08.pdf
- 3000_series_CCC_2023_04.pdf
- 3000_series_CCC_2020_12.pdf
- Previous versions
- Latest version
FM certificate
- 3xxx_FM17CA0003X_US0004X.pdf
- 3xxx_FM_3041043_C.pdf
- Previous versions
- Latest version
UL certificate
- 3185_3186_UL.pdf
- Latest version
DNV marine certificate
- DNV_3xxx_TAA00001RW.pdf
- Latest version
EAC declaration
- EAC_EMC_declaration_Ex_3000_5000_6000_9000.pdf
- Latest version
EAC declaration
- EAC_Ex.pdf
- Latest version
Metrology Pattern Approval (MPA), Russia
- MPA_Russia.pdf
- Latest version
Supplementary documentation
EU Declaration of Conformity
- 3185DoC_EU_105_UK.pdf
- 3185DoC_EU_104_UK.pdf
- 3185DoC_EU_103_UK.pdf
- 3185DoC_EU_102_UK.pdf
- 3185DoC_EU_101_UK.pdf
- 3185DoC_EU_100_UK.pdf
- Previous versions
- Latest version
UKCA Declaration of Conformity
- 3185DoC_UKCA_100_UK.pdf
- Latest version
EAC LVD declaration
- 3000_EMC_data.pdf
- Latest version
Safety note
Safety note
View variants
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 & meas. / 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...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 (1) |
| Voltage limit | 17.5 V |
| of span | = 0...20 mA |
I.S. / Ex marking
| ATEX | II 3 G Ex ec IIC T4 Gc |
| IECEx | Ex ec IIC T4 Gc |
| FM, US | Cl. I, Div. 2, Gp. A, B, C, D T4 or Cl. I, Zone 2, AEx nA IIC T4 |
| FM, CA | Cl. I, Div. 2, Gp. A, B, C, D T4 or Cl. I, Zone 2, Ex nA IIC T4 |
| EAC Ex | 2Ex nA IIC T4 Gc X |
Observed authority requirements
| EMC | 2014/30/EU & UK SI 2016/1091 |
| LVD | 2014/35/EU & UK SI 2016/1101 |
| ATEX | 2014/34/EU & UK SI 2016/1107 |
| RoHS | 2011/65/EU & UK SI 2012/3032 |
| EAC | TR-CU 020/2011 |
| EAC Ex | TR-CU 012/2011 |
Approvals
| ATEX | KEMA 10ATEX0147 X |
| IECEx | KEM 10.0068X |
| UKEX | DEKRA 21UKEX0055X |
| c FM us | FM17US0004X / FM17CA0003X |
| c UL us, UL 61010-1 | E314307 |
| CCC | 2020322310003554 |
| DNV Marine | TAA00001RW |
| EAC Ex | EAEU KZ 7500361.01.01.08756 |