84/89-2i1 le/4.96

SINEAX / EURAX 2I1
Passive DC signal isolator
without power supply
Application
The DC signal isolator SINEAX/EURAX 2I1 (Figs. 1 and 2) serve to
isolate load-independent DC current signals. It suppressed noise
voltages and currents in a signal loop circuit.
Features / Benefits
● Electrically insulated between input and output / Prevents the transfer of interference voltages and currents, overcomes signal connectionproblems Fig. 1. SINEAX 2I1 in housing N for rail or wall mounting.
● No power supply required / No additional wiring and no power supply ● Up to 4 DC signal isolators on a single plug-in module Available in type of protection “Intrinsic safety” [EEx ib] IIC (see“Table 4: Data on explosion protection”) Layout and mode of operation
The DC signal isolator comprises a DC chopper Z, an isolatingstage T, a rectifier R and a multivibrator M (see Fig. 3). The DCchopper converts the load independent DC signal into an AC sig-nal. This signal is passed through a ferrite-core transformer servingas an isolating stage. On the secondary side, it is rectified, smoothed Fig. 2. EURAX 2I1 with the special feature “Test sockets”, and converted into a load-independent DC signal.
front plate width 4 TE.
The chopper unit is controlled by a specially designed multivibratorwhich obtains its power from the input signal.
Depending on type no., 1, 2 or 4 independent isolators can bemounted on one plug-in module.
Technical data
Input signal E
0.5 mA to 0.20 mA, 4.20 mA(all ranges are possible with the sametype) U ≤ 15 V (see “Application example”, SINEAX / EURAX 2I1
Passive DC signal isolator
Output signal A
Accuracy data
Regulations
5 kV, 1.2/50 µs surge withstand testIEC 255.4 and Surge withstand test, < – 0.1% / 100 Ω if R > 250 Ω Installation data for surface mounted housing
all current circuits against each other.
Output 1 against jumper “module wall mounting. (Dimensions see Sec-tion “Dimensional drawings”) Environmental conditions
SINEAX – 20 to + 40 °C,
EURAX – 20 to + 55 °C
Installation data for plug-in module
Plug-in range module in Euro-PCBformat, 100 × 160 mm (see Section“Dimensional drawings”) 1 and 4 see Section “Special features” Table 1: Type overview
Table 2: Specification and ordering informations
Order Code 880 –
1. Mechanical design
2) Plug-in module (EURAX) for 19″ rack-mounted case 2. Version
3. Number of isolation circuits
4. Input / output variants E and A
intrinsically safe,
intrinsically safe,
intrinsically safe
intrinsically safe
* Where signal isolators are required for wall mouting, attention must be drawn to the fact when ordering and a corresponding base plate will be fitted. SINEAX / EURAX 2I1
Passive DC signal isolator
Order Code 880 –
5. Special features
Without special features (line 0): Order code complete.
With special feature (line 1): The features to be omitted mustbe marked hereafter with / (slant line) in the order code untilreaching the required feature 6. Increased test voltage (EURAX) 1
A) Input signals against output signals and against front plate 4 kV, 50 Hz, 1 min. instead of 2 kV, 50 Hz, 1 min.
7. Test sockets (EURAX) 2
Voltage drop over field indicator resp. mA-meter ≤ 300 mVEx versions only for short term connection of a passivemeasuring instrument.
Attention! Test voltage: Sockets versus front plate only 2 kV 8. Safety current loop (EURAX) 3
A) “Module withdrawn” with jumper on transducer PCB and 9. Improved climatic rating 4
A) Annual mean relative humidity ≤ 90% instead of ≤ 75%
* Lines with letter(s) under “no-go” cannot be combined with preceding lines having the same letter under “SCODE”. 1 to 4 see Table 3 “Special features” Table 3: Special features
Test voltage (EURAX)
Safety current loop “module withdrawn” (EURAX)
(not possible for Ex version)
With jumper on transducer PCB and 2 additional contacts Output 1 against jumper “module withdrawn”: 1.5 kV Chassis against jumper “module withdrawn”: 2.5 kV Version with test sockets: Test sockets versus front Output 1 against jumper “module withdrawn”: 1.5 kV Improved climatic rating
Test sockets (EURAX)
Annual mean relative humidity ≤ 90% instead of ≤ 75%
Fitted on front plate(voltage drop over milliammeter ≤ 300 mV) Ex version only for short term connection of a passive meas-uring instrument Table 4: Data on explosion protection
II (2) G resp. II (1) G
values:
U = 30 V
SINEAX / EURAX 2I1
Passive DC signal isolator
Electrical connections
SINEAX 2I1 in surface mounted housing
84-2I1-10
84-2I1-11
84-2I1-12
EURAX 2I1 as plug-in module (showing rear of module)
Version with intrinsically safe inputs
Version with intrinsically safe outputs
* A safety circuit may be looped via the jumper, for signalling “mod- ule withdrawn” or “module not plugged in properly”.
Dimensional drawings
Fig. 18. EURAX 2I1, front plate width 4 TE.
SINEAX / EURAX 2I1
Passive DC signal isolator
Application example
The output signal generated by the KINAX 3W2 is needed both for local and remote measurement.
Problem:
Is the burden R2 connected across the output signal of the isolating transformer type 84-2I1-10 sufficient for local measurement?If not, then use, for example, SINEAX TV 808.
U = U – U – U – (R1 · 20 mA) = 8 V Burden R2 [Ω] = = 400 Ω Fig. 19. Typical circuit with an isolating transformer SINEAX 84-2I1-10, a transmitter KINAX 3W2 for angular measurement and a power supply unitSINEAX B 811. Printed in Switzerland • Subject to change without notice • Edition 11.98 • Data sheet No. 84/89-2I1 Le Aargauerstrasse 7CH-5610 Wohlen/SwitzerlandPhone +41 56 618 21 11Fax +41 56 618 24 58

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