IsoLoop Isolation Amplifier
Input and output galvanically isolated
Isolation voltage 2 kVdc
No separate power supply needed
Supplied by the primary circuit
Loop-drop typ. 6.5 Vdc
Transmission error < 0.1%
Transmitter- and instrument isolator and DC/DC
converter
Open-loop protection
Low transfer capacity
Description
The current signal on the input drives an oscillator circuit which
generates the output signal through a transformer, resulting in galvanic
isolation between the input and the output.
Due to the unique design, IsoLoop can be used as a transmitter/
instrument isolator as well as a DC/DC converter.
The primary loop can be protected against interruptions in the secondOptimal accuracy is gained by opto-coupler feedback from output to
ary loop by a built-in zener diode.
input circuits. Input and output are protected against voltage peaks and
IsoLoop ensures perfect galvanic isolation with a high degree of transreverse polarity.
mission accuracy, a short response time and low capacitive transmisIsoLoop can be used when galvanic separation of 4...20 mA analogue sion between input and output.
signals is required.
Both the IsoLoop and the secondary loop will be supplied from the
power supply in the primary loop.
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Design and specifications subject to change without notice
Data Sheet 8307-1
Page 1
Technical Data
Input data
Environmental conditions
Signal type
4...20 mA, 2-wire
Operating temperature
-10...60°C
Voltage drop
< 6.5 Vdc at 20 mA/15 Vdc
Storage temperature
-40...85°C
(See graph)
Humidity
< 90% RH, non-condensing
+/- 35 Vdc
Vibrations
Lloyds Register, test 2
Protection
Output data
EMC data
Signal type
4...20 mA, 2-wire
Immunity
EN 50082-2
Current limiting
Nom. 28 mA
Emission
EN 50081-1
Response time
< 1 msec. (10...90%)
Mechanical data
Protection
+/- 35 Vdc
Dimensions
62 x 88 x 24 mm
DIN-rail mounting
According to DIN 46277
Protection class
Housing: IP 30
Other data
Isolation voltage
2 kVdc
Transmission error
< 0.1% f.r. (incl. lin. error)
Temperature drift
Typ. 0.003% per °C
Weight
Max. 0.01% per °C
Disposal of product and packing
Voltage drift
< 0.001 mA per V
Transmission capacity
Typ. 15 pF
Terminals: IP 10
0.1 kg
According to national laws or by returning to Baumer
Ordering Details - IsoLoop Isolation Amplifier
82 33 - 214
IsoLoop Isolation Amplifier
Dimensional Drawing
Electrical Installation
Secondary loop
[mm]
+
4...20 mA
3 4
8 Protection
Zero
65.5
Span
62
1 2
4...20 mA
24
88
+
Primary loop
Block Diagram
Zero Span
+
+
1
3
2
4
The potentiometers for Zero and Span
adjustment are factory calibrated and sealed
with laquer. Operator invention is normally not
needed.
8
6V8 zener
diode
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Design and specifications subject to change without notice
Data Sheet 8307-1
Page 2
Examples of Application
Instrument isolator
Udrop = Uin - Uout [Volt]
9
Secondary loop
8
RTD
7
Note
{1}
3 4
8
3 4
7
6
4...20 mA
5
R loa
4
1 2
+
24 Vdc
1 2
+
4...20 mA
FlexTemp
O hm
R load = 0 O
3
Rload
= 50 0
d
hm
2
1
Primary loop
IsoLoop
I [mA]
0
0
2
4
6
8
Instrument
Calculation of min. voltage supply (Uin)
Uin > Udrop + UFlexTemp + (Imax • Rload)
10 12 14 16 18 20 22
Graph 1
Note
{1} In case the secondary loop is open (Rload is infinite) this will be
transformed to the primary loop. The voltage drop across the primary
will increase, hence the measuring circuit will malfunction.
Ex.: Rload = 500 Ohm ; Imax = 20 mA ;
Udrop = 6.5 V (read graph 1)
Uin > 6.5 + 6.5 + (0.020 • 500) = 23 V
If the terminals 4 and 8 are connected together a 6.8 V zener diode is
connected across the secondary loop.
Calculation of max. load resistance (Rload)
With an open secondary loop this diode will protect the primary loop
and create a constant output voltage of 6.8 Volt. The voltage drop over
terminals 1 and 2 will then be max. 13.5 Vdc.
U -U
Rload < in drop [Ohm]
Imax
Ex.: Uin = 24 V ; Udrop = 8 V (read graph 1)
When the zener diode is connected the secondary will measure
lineary for Rload < 250 Ohm.
24 - 8
= 800 Ohm
20
Rload <
Transmitter isolator
Secondary loop
RTD
+
-
24 Vdc
8
3 4
7
3 4
8
Udrop = Uin - Uout [Volt]
9
v
U in = 35 dc
7
v dc
6
U in = 15
5
U in = 6.5 v dc
4
Rload
Gnd
3
1 2
+
Primary loop
-
1 2
+
4...20 mA
-
2
1
I [mA]
0
0
PLC
IsoLoop
FlexTemp
2
4
6
8
10 12 14 16 18 20 22
Graph 2
Calculation of min. voltage supply (Uin)
Uin > Udrop + UFlexTemp + (Imax • Rload)
Ex.: Rload = 100 Ohm ; Imax = 20 mA ;
Udrop = 6.0 V (read graph 2)
Uin > 6.0 + 6.5 + (0.020 • 100 ) = 14.5 V
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Design and specifications subject to change without notice
Data Sheet 8307-1
Page 3
UK/2007-03-21 This data sheet may only be reproduced in full.
www.baumerprocess.com
Design and specifications subject to change without notice
Data Sheet 8307-1
Page 4