1.0 DESCRIPTION
This 4-20mA isolator can be configured to accept most of the common
voltage found in both commercial and industrial applications. The input is
fully isolated from the output circuit. The isolator range can be specified at
the time of order, but if required the user may re-range the transmitter to
ta new range. The isolator is housed inside a plastic enclosure, suitable
for DIN rail mounting. Screw terminals are providedfor wire connections.
The enclosure provides side entry access to coarse offset and span
adjusters and a range selector switch.
2.0 SPECIFICATIONS @ 20ºC
2.1 OUTPUT
TYPE
Passive 2 wire current output
RANGE
4 to 20mA (30mA MAX.)
PROTECTION
Reverse connection plus overvoltage
VOLTAGE
10-30V DC
STABILITY
Typical 100ppm/ºC
RIPPLE
Less than 40
µ
A/V (Measured at 1V ripple 50Hz)
RESPONSE
200mS to reach 70% of final value
2.2 INPUT
TYPE
Isolated DC voltage covered by six ranges;
Range
Span
Offset
0
20 to 200mV
-20 to 80mV
1
0.2 to 1.0V
-0.1 to 0.4V
2
1.0 to 5.0V
-0.5 to 2.0V
4
5.0 to 25V
-2.5 to 10V
8
25 to 48V
-5 to 25V
F
20 to 100V
-10 to 40V
The above settings are capable of covering most
standard industrial ranges. Range F is provided to
allow for –10 to +10V inputs. Note VMAX IN is limited
to 48V DC for BSEN 61010-1 compliance.
ISOLATION
500V AC (Flash tested to 1kV DC)
IMPEDANCE
>1M
Ω
ACCURACY
Typical linearity
±
0.01% (0.05% maximum)
RANGE SELECT Coarse Settings, by side entry 16 setting position
rotary screw adjustement switches. Fine by front
access potentiometers. Range setting by side entry
rotary switch.
2.3 GENERAL
AMBIENT
0-50ºC ; 10-95% RH non-condensing
CONNECTION
Captive clamp screws
CABLE SIZE
4mm
2
solid / 2.5mm
2
stranded
3.0 INSTALLATION
IMPORTANT NOTE ¡
This isolator is not suitable for providing isolation from hazardous
voltages, such as mains supplies. It is intended for use in with low
voltage signals only.
3.1 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. Span and offset fine adjustements
can be made from the front panel, whilst re-ranging the transmitter,
access to adjusters in the case side is requiered.
3.2 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. The correct type of wire
must be used for thermocouple inputs, mV inputs must use screened
copper wires, Incorrect sensor connection or sensor wire burnout will
result in the output current saturating up scale on standard units(optionally
downscale if requested at the time of the order).
It is good practice to ensure all 4-20mA signal loops are grounded at one
point. Care must be taken when designing a 4-20mA circuit to ensure that
the total burden of the loop, (that is the total voltage requirements of all
the equipment connected in the loop at 20mA) does not exceed the loop
power supply voltage.
To operate correctly the isolator requires a minimum of 10V across its
output terminals.
The isolator is protected agains reverse connection and over voltage
Figure shows a typical 4-20mA circuit, the load resistor represents
equipment such as indicators, loggers, PLC etc.
KOS1015
DIN RAIL
ISOLATED
TRANSMITTER
kos1015manualB.doc
30727040
Sep.99
KOSMOS SERIES
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.
