IsoTrans® A 47 For isolation of 0(4) ... 20 mA standard signals, up to 4 channels
Product description
Facts
Product Line
Dimension drawings
Schematic diagram
Specifications
Transfer Function
The Task
Guaranteeing reliable and safe system operation requires galvanic isolation between the sensor and controller (for example, DCS, PLC etc.).
The Problems
are often, particularly in large plants, the lack of space for mounting the isolators and the increasing operating temperatures in distributors and enclosures.
The Solution
from Knick is the IsoTrans® A 47 advanced series of loop-powered isolators. An extremely high component density of 177 channels per meter of top-hat rail and excellent technical properties, such as protective separation, make the isolators unbeatable.
The Housing
The modern modular housing with a width of 12.5 mm for 1 or 2 channels and 22.5 mm width for 4 channels with practical plug-in terminals allow simple and quick assembly or prewiring of the enclosure.
The Function Principle
The IsoTrans® A 47 obtains its power directly from the measuring signal as a voltage drop without falsifying it. There are no costs for a power supply and wiring.
The IsoTrans® A 47 has virtually no self-heating that would cause the electronic components to age faster. Together with a patented circuit technology, this means maximum reliability. Due to this long service life, we give a 5-year warranty.
The Technology
0.1 % accuracy, excellent square-wave response and very low residual ripple guarantee perfect signal transmission. The low intrinsic voltage drop of approx. 2.5 V only loads the signal slightly.
The high test voltage up to 4 kV AC and protective separation up to 300 V according to EN 61140 protect operating personnel against the mains voltage, for example.
Facts
Extremely compact design: up to 177 channels per meter
1-, 2- and 4-channel versions: cheap and flexible for a wide range of applications
Practical screw terminals: simple, time-saving assembly and prewiring of enclosures
Galvanic isolation between input and output: protection against incorrect measurements or damage to the measuring system due to parasitic voltages
No power supply required: cost savings due to lower wiring requirement, no mains influences, no unnecessary heating and therefore maximum service life of components
High accuracy: no falsification of measuring signal
Maximum reliability: no repair and failure costs
5-year warranty
Product line
Devices
Order no.
IsoTrans® A 47
1-channel, H1 modular housing (width: 12.5 mm)
A 47 H1 / 1
2-channel, H1 modular housing (width: 12.5 mm)
A 47 H1 / 2
4-channel, H3 modular housing (width: 22.5 mm)
A 47 H3 / 4
Power supply
None, supply from input signal
Options
Increased test voltage 4 kV AC, protective separation
506
Dimension drawings and terminal assignments
Schematic diagram
Specifications
Input data
Input
0(4) ... 20 mA / max. 30 V (linear transmission up to 50 mA)
Operating current
<20 µA
Voltage drop
Approx. 2.5 V at 20 mA
Overload
100 mA, 30 V
Output data
Output
0(4) ... 20 mA / max. 27.5 V (corresponds to 1375 ohms load)
Residual ripple
<5 mVrms
Transmission behavior
Transmission error
<0.1 % full scale
Load error
<0.02 % meas.val. / 100 ohms
Response time (T99)
Approx. 5 ms at 500 ohms load
Temperature coefficient 1)
<0.002 %/K meas.val. per 100 ohms load (reference temperature 23 °C)
Isolation
Test voltage
1.5 kV AC input against output of the same channel
2.3 kV AC channels against each other
Standards and approvals
EMC 2)
EMC directive 89/336/EEC, EN 61326
Approvals
UL: File no. E 220033, Standards: UL 508 and CAN/CSA 22.2 no. 14
Data for Option 506
Test voltage
4 kV AC input against output of the same channel
2.3 kV AC channels against each other
Protection against
Protective separation to EN 61140 by reinforced insulation in accordance with
electric shock
EN 61010-1.
Working voltages up to 300 V AC/DC across all connections with overvoltage category II and
pollution degree 2.
For applications with high working voltages, you should ensure there is sufficient
spacing or isolation from neighboring devices and protection against electric shocks.
Other data
MTBF3)
Approx. 1031 years/channel
Ambient temperature
Operation:
–10 ... +70 °C
Transport and storage:
–40 ... +85 °C
Housing
Modular housing, width 12.5 mm or 22.5 mm, with pluggable screw terminal
See dimension drawings for further measurements
Protection class
IP 20
Mounting
Metal lock for mounting on 35 mm top hat rail according to EN 50022
See dimension drawings for conductor cross section
Weight
Approx. 100 g
1) Average TC in specific working temperature range –10 ºC ... +70 °C
2) Applies to 4 ... 20 mA, slight deviations are possible while there is interference
3) Mean Time Between Failures - MTBF - to EN 61709 (SN 29500). Conditions: stationary operation in well-tended rooms, average ambient temperature 40 °C, no ventilation, continuous operation