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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
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 & 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 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 |
| 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 |
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 |
| EAC Ex TR-CU 012/2011 | RU C-DK.GB08.V.00410 |