D2543-01-02 CN5219 SEM1000 Web User Guide
The SEM1000 isolator is designed to be series connected into a new or existing (4 to 20) mA current
loop and provide an isolated (4 to 20) mA signal capable of driving into 300 R. The output is powered
from the input loop.
Type
Current input 2 wire loop powered
Range
(4 to 20) mA (30 mA maximum)
Protection
Reverse connection
Voltage Drop
5.5 V + O/P V Drop (O/P V Drop = O/P load x 0.02)
Max Loop Supply
35 V
Type
(4 to 20) mA source (Powered from input)
Load
(0 to 300)
Ω
(Open circuit limits at approximately 15 V)
Isolation
500 VAC (flash tested @ 1 kV) (Isolation method, opto-
coupler/transformer)
Electrical Safety
BS EN61010-1 Pollution Degree 2; Installation CAT II; CLASS I
Ambient
(0 to 70) ºC; (10 to 95) % RH non condensing
Accuracy
0.05 % full range output
Stability
0.01 % / ºC
Response Time
Less than 100 ms to reach 63 % of final value.
EMC
Compliant with BS EN50081-1, BS EN50082-1
Connection
Captive clamp screws
Cable Size
Maximum 4 mm² solid/2.5 mm² stranded
Case Material
Grey Polyamide
Flammability
To UL94-VO VDE 0304 Part 3, Level IIIA
Dimensions
(60 x 60 x 12.5) mm (67.5 mm above rail)
Mounting
Snap on "Top Hat" rail (DIN EN 50022-35)
Adjustments
Zero and Span Adjustment
Page 1
This unit must be housed within a suitable enclosure that will provide protection from the external
environment, ensuring that the stated temperature and humidity operating ranges are not exceeded. It
is good practice to mount the unit away from sources of electrical noise, such as switch gear and
transformers. The unit enclosure is designed to snap fit onto a standard "Top Hat" DIN rail. To
remove from rail, apply pressure at the bottom face at the back upwards towards the rail to release
the spring clip and tip away from the top. The unit may be mounted in any orientation and stacked
side by side along the rail.
Connections to the isolator are made via screw terminals. Wire protector plates are provided inside
each terminal. To maintain CE compliance twisted pair (screened) cables are recommended. It is also
good practice to ensure that all (4 to 20) mA loops are grounded at a single point in the loop. Before
installation, care must be taken to ensure enough voltage is available in the loop to drive the total loop
load. Refer to the specifications listed for the voltage drop. In the case of the SEM1000 the additional
voltage drop of the load connected in the isolated circuit, will be added to the loop drop of the isolator,
for example a SEM1000 isolator driving into a 250
Ω
load will have a total loop drop of 10.5 V
maximum.
Refer to the SEM1000 series data sheet for further information on applications of this series of
isolators. Please note the isolation provided by this device is only suitable for providing isolation
between two process signals and therefore must not be used to provide isolation from hazardous
voltages, such as mains supplies.
Figure 1
Page 2
1.0 DESCRIPTION
2.0 SPECIFICATION
2.1 INPUT
2.2 OUTPUT
2. 3 GENERAL SPECIFICATION @ 20 °C
3.0 INSTALLATION
3.1 MECHANICAL
3.2 ELECTRICAL
SEM1000
ZERO
SPAN
OUT
IN
