Ditel KOS1010 Isolators

KOS1010 Isolator

The KOS1010 is an output loop powered analogue (4-20mA) signal isolator. The small size enables many more units to now be installed in the same physical space. Their high accuracy allows the addition of isolation to systems without significantly degrading the overall system performance. The Zero and Span adjustment potentiometers can be used to remove any system errors.

 

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operation

This isolator requires no user adjustment during commissioning. Minor adjustments can be made to the calibration of the device by means of the two front panel accessible 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.

installation

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 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 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.

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.

General Specifications @ 20°C

Isolation 500Vac (Flash test @ 1kV)
(Isolation method, opto coupler / transformer)
Environment BS EN61010-1 Pollution Degree 2; Installation Cat II; Class I
Ambient 0-70ºC; 10-95% RH non condensing
Linearity 0.05%
Stability 100ppm/ºC
Response Time Less than 100mS to reach 70% of final value
EMC Tested to IEC 801-2 Susceptibility to E.S.D.
IEC 801-3 Susceptibility to Radiated Interference
IEC801-4 Susceptibility to Conducted Interference
EN55022 Radiated Emissions
Connection Captive Clamp Screws
Cable Size MAX. 4mm2 solid / 2.5mm2 stranded
Case Material Grey Polyamide
Flammability UL94-VO VDE 0304 part 3, Level IIIA
Dimensions 60 x 60 x 21mm (67.5 above rail)
Mounting Rail DIN EN 50022-35
Adjustment Front Entry fine Zero and Span Adjustment

specifications

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 Two wire 4-20mA
Power & Monitors Two Wire
Transmitter from the loop output
Range 4-20mA (25mA MAX.)
Protection Current Limited
Tx Supply 5-15Vdc Max.
MAX. Loop Volts 35V
OUTPUT
Type 4-20mA Current sink reverse protected
Loop Drop 5Vdc @ 20mA (with a 10V Tx drop)
6.5Vdc max. @ 20mA DC
10V max. @4mA DC

technical manual

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