2.1 Mechanical
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
swichgear 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 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.
2.2 Electrical
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 4-20mA 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.
Refer to the KOS1000 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
hazardousvoltages,suchasmainssupplies.
Additional + terminal is provided on output side to allow wiring to be chain
connected to a number of units.
3.0 OPERATION
This isolator requires no user adjustment during commisioning. Minor
adjustments can be made to the calibration of the device by means of the
two front panel accesible calibration potentiometers. Incorrect connection
in the loop will not damage the device as long as the specified maximum
currents/voltages are not exceeded. If the isolator fails to operate, check
loop for bad connections. Ensure enough voltage is available in the loop
to power the isolator. In the unlikely event of the isolator not working, it
should be returned to the supplier for repair or replacement.
4.0 CALIBRATION
4.1
Connect a precision current calibrator to the input and a
precison current meter to the output of the device to be
calibrated. (*1) Power the ouput with a 24V supply.
4.2 Inject 4.000mA ±0.001mA into the input and adjust zero
potentiometer for 4.000mA ±0.001mA output. (*2)
4.3 Inject 20.000mA ±0.001mA into the input and adjust span
potentiometer for 20.000mA ±0.001mA output. (*2)
4.4 Repeat steps 4.2 and 4.3 until both points are in calibration.
Notes.*
1Current calibrator must be capable of driving the expected
loop drop.
2Please note that the above reading accuracies quoted in 4.2
and 4.3 are absolute values and do not include test equipment
tolerances.
1.1 DESCRIPTION
The KOS1010 is designed to provide an isolation barrier between a field
mounted 4-20mA transmitter and the process monitoring system. The
isolator output is a two wire 4-20mA current sink. The KOS1010 derives
it’s power from the output loop.
INPUT
Type Twowire 4-20mA.
Powers & monitors two wire.
Transmitter from the loop output.
Range 4-20mA (25mA MAX.)
Protection Current limited.
Tx supply 5-15V DC Max.
MAX. Loop Volts 35V.
OUTPUT
Type 4-20mA Current sink reverse protected.
Loop Drop 5V DC @ 20mA (with a 10V Tx drop)
6.5V DC max @ 20mA DC
10V maax @ 4mA DC
1.2 GENERAL SPECIFICATION @ 20°°C
Environment
Ambient
Linearity
Stability
Response Time
EMC tested to
Connection
Cable size
Casematerial
Flammability
Dimensions
Mounting
Adjustment
500V AC(flash test @ 1kV).
(Isolationmethod,
opto coupler / transformer)
BS EN61010-1 POLLUTION DEGREE 2;
INSTALACIÓN CAT II; CLASS I
0-70°C; 10-95% RH non condensing.
0.05%.
100ppm/°C.
Less than 100mS to reach 70% of final value.
IEC 801-2 Susceptibilidad a E.S.D.
IEC 801-3 Suscept. a interferencias radiadas
IEC 801-4 Suscept. a interferencias conducidas
EN 55022 Emisiones radiadas
Captiveclamp screws.
MAX. 4mm2solid / 2.5mm2stranded.
Grey Polyamida.
UL94-VO VDE 0304 part 3, Level IIIA.
60x60x21mm (67.5 above rail).
Rail DIN EN 50022-35
Front entry fine Zero and Span adjustment.
ISOLATOR
4-20mA
WARRANTY
The instruments are warranted against defective materials and
workmanship for a period of three years from date of delivery.
If a product appears to have a defect or fails during the normal use
within the warranty period, please contact the distributor from which
you purchased the product.
This warranty does not apply to defects resulting from action of the
buyer such as mishandling or improper interfacing.
The liability under this warranty shall extend only to the repair of the
instrument. No responsability is assumed by the manufacturer for
any damage which may result from its use.
