Galvanic Isolator for Smoke Detection In Cargo Hold

Function

Isolated barriers are isolators used for protection of intrinsically safe circuits in hazardous areas. In addition to the required current, voltage and power limitation, the isolated barriers have a galvanic isolation between the field circuit and the controller.

The K-System consists of wide range of isolated barriers suitable for mounting on 35 mm DIN mounting rail. K-System is easy to specify, integrate and expand. Our extensive line of intrinsic safe isolators for hazardous location applications contains over 150 different devices.

The 3 housing widths versions have the same system characteristics. All devices can be mounted on the 35 mm DIN mounting rail or the Power Rail.

Transparent Front Flap

This front flap has several functions:
1、Protection of the device against electrostatic discharge
2、Protection of the operating elements from pollution
3、Integrated label carrier for individual labeling

Color Identification
The color identification of the devices has the following meaning:
1、Green (1) indicates devices with DC power supply.
2、Black (2) indicates devices with AC power supply.
3、Gray (3) indicates devices with AC/DC wide range supply.
4、Blue (4) indicates devices that process signals from the hazardous area.

Status Indicators of the Isolators
LEDs are often used on isolators to indicate different statuses (e. g. for power supply, device failure, status messages, binary switching states). Standard LED colors are assigned to the status display according to NAMUR NE44.

Mounting

Vertical and horizontal mounting

Low heat dissipation allows vertical or horizontal mounting without separation distance. Operation is guaranteed over the full temperature range of the system in any mounting direction and without restriction.

Mounting the Isolated Barriers with Separation Distance

Mount the device on the DIN mounting rail. Observe the specified minimum separation distance. See following figures.
1、KF devices with 20 mm housing width, housing type B*: min. 10 mm
2、KF devices with 40 mm housing width, housing type C*: min. 15 mm

Connecting the Power Supply

Connect the power supply via the screw terminals or spring terminals.

Power Supply with Power Rail

For devices with a 24 V DC supply voltage, use of the Power Rail reduces wiring and installation costs. The Power Rail almost completely eliminates the risk of wiring faults and facilitates expansion.

Power is supplied to the Power Rail via a power feed module which provides a voltage of 24 V DC (max. 4 A) to a maximum of 80 devices.

The power feed module features a replaceable 5 A fuse at the front. This fuse ensures that the Power Rail and connecting contacts are protected. It prevents damage caused by reverse supply voltage or by installing too many isolators. The isolators on the Power Rail feature integrated device fuses. Any faults in the isolator or in the signal leads do not affect the Power Rail supply system. The 5 A fuse permits a rated current of up to 4 A across the entire temperature range.

The power feed module also has the task of outputting a collective error message or power failure of the isolators via a separate relay output.

Direct Supply with Power Supply

to the isolated barriers.

Operation
Fault Monitoring
Numerous faults can occur between measurement of the process variable and evaluation in the control system. This can lead to undesirable process statuses under certain circumstances. These process statuses may result in plant downtime or quality problems or even present a hazard to persons and the environment. Depending on the device version, the isolators enable monitoring of the following faults:

1、Line faults
Here, the connection cables between the isolator, the field device and the control system are monitored for lead breakages or short circuits.
2、Device faults
The isolators are designed so that internal faults are detected and reported. In the case of a power failure, the outputs are switched to the de-energized state.

 Fault Output

Depending on the configuration of the devices, these faults are transmitted to the outputs at the control side and in separate fault indication outputs as additional information.

• Red fault indication LEDs on the isolator
• Fault indication output
• Collective error message on Power Rail

 Fault Indication Output

Line and device faults are transmitted if the device has a fault indication output (FAULT). The fault indication output is active in a normal state and inactive in a fault state (closed-circuit principle). Is it impossible to reverse the detection direction of the fault indication output.

Line Fault Transparency (LFT)

Line fault transparency makes electrical conditions on the field side visible on the control sideof the isolator. This enables line faults between the isolator and the field device to be detected and transmitted to the control system via the signal line.

Collective Error Message on Power Rail

The fault can also be output via the Power Rail as a collective error message (FAULT).

The collective error message enables line fault detection of many isolators without requiring additional wiring. In the event of a fault, a fault message signal is transmitted to the Power Rail from an isolator. The power feed module evaluates the signal and transmits the fault message signal to the controller by means of a potential-free contact.

The potential-free contact simultaneously reports the device power failure or the failure of one device minimum.

1   Power feed module
2   Fault indication on one of the devices (red LED flashes)
3   Process control system
4   Fault indication output

Current and Voltage Standard Signals

The following signals have established themselves as the standard:

• the 0/4 mA to 20 mA current signal
• the 0/2 V to 10 V voltage signal
• the 0/1 V to 5 V voltage signal

Analog sensor signals and digital frequency signals are converted into one of the two standard signals for processing in a wide variety of measurement, regulatory and control tasks. Sensor signals are converted into standard signals via signal converters.

 

1   Failure information
2   Measuring information

Dismounting, Maintenance, and Repair

Dismounting the Isolated Barrier
Use for dismounting of the device a slotted screwdriv
1、Insert the screwdriver (4) into the groove of the red mounting slider (3).
2、Turn the screwdriver (4) in the groove until the red mounting slider (3) springs back.
3、Repeat these steps on the other side of the device.
4、Remove the isolator (2) from the DIN mounting rail (1).

1     35 mm DIN mounting rail
2     Isolated barrier
3     Mounting slider
4     Slotted screwdriver

Technical Specifications

Electrical Data

Non-Hazardous Area Signals or Control Circuit Signals

• 0/4 mA to 20 mA signal level according to NE 43
• 0/2 V to 10 V signal level according to NE 43
• 0/1 V to 5 V signal level according to NE 43
• Current output HART compatible
• Current input HART compatible
• Digital output: active or passive electronic output 100 mA/30 V, short-circuit protected
• Relay output 2 A, minimum load 1 mA/24 V
• Logic level 24 V according to IEC 60946
• Functional isolation or safe isolation according to IEC 61140 and NAMUR NE 23

Hazardous Area Signals or Signals in the Field Circuit

• Transmitter power supply up to 17 V DC
• Current output HART compatible
• Pt100, 2-, 3-, (4)-wire technology
• Resistor 0  to 400  with freely definable characteristic
• Potentiometer
• Thermocouples of all types, internal cold junction, external reference
• Current output HART compatible
• Digital input according to NAMUR EN 60947-5-6
• Digital output for standard Ex-i valves, short-circuit protected

Ambient Conditions

Storage Temperature
-40 °C to 90 °C (-40 °F to 194 °F), exceptions see datasheets

Reference Conditions for Adjustment
20 °C (68 °F)

Relative Humidity
max. 95 % without moisture condensation

Corrosive gas durability
according to ISA-S71.04, group A, severity level G3 (harsh)

Altitude
max. 2000 m

Vibration Resistance
according to EN 60068-2-6, 10 Hz to 150 Hz, 1 g, high crossover frequency

Shock Resistance
according to EN 60068-2-27, 15 g, 11 ms, half-sine

Mechanical Specifications

Mounting
1、Snap-on 35 mm DIN mounting rail according to EN 60715. Can be mounted horizontally or vertically, side by side.
2、Panel mount: The lugs on the base of the isolator must be extended and used for mounting purposes with 3 mm screws.
3、K-MS mounting base for screw attachment

Housing Material
Polycarbonate (PC)

Dimensions
Dimension drawings please refer to chapter Dimensions.

Protection Degree
IP20 according to EN 60529

Connection
1、KH* devices: self-opening terminals for max. core diameter of 1 x 2.5 mm2 (14 AWG)
2、KF* and KC* devices: removable connector with integrated self opening terminals for leads of up to a max. of 1 x 2.5 mm2 (14 AWG)
3、Observe the tightening torque of the terminal screws. The tightening torque is 0.5 Nm to 0.6 Nm.

Fire Protection Class
Housing: V2 according to UL 94 standard. Unless stated otherwise all details relate to the reference conditions.

 
Dimensions

Housing Types for K-System Isolated Barriers

• Device with screw terminals: 12.5 x 119 x 114 mm (0.71 x 4.7 x 4.5 inch)
• Device with screw terminals and test sockets: 12.5 x 124 x 114 mm (0.71 x 4.9 x 4.5 inch)
• Device with spring terminals: 12.5 x 131 x 114 mm (0.71 x 5.2 x 4.5 inch)
• Number of terminal blocks max. 5

• Device with screw terminals: 20 x 107 x 115 mm (0.8 x 4.2 x 4.5 inch)
• Device with screw terminals and test sockets: 20 x 115 x 115 mm (0.8 x 4.5 x 4.5 inch)
• Device with spring terminals: 20 x 122 x 115 mm (0.8 x 4.8 x 4.5 inch)
• Number of terminal blocks maximum 4

• Device with screw terminals: 20 x 119 x 115 mm (0.8 x 4.7 x 4.5 inch)
• Device with screw terminals and test sockets: 20 x 124 x 115 mm (0.8 x 4.9 x 4.5 inch)
• Device with spring terminals: 20 x 131 x 115 mm (0.8 x 5.2 x 4.5 inch)
• Number of terminal blocks maximum 5

• Device with screw terminals: 40 x 107 x 115 mm (1.6 x 4.2 x 4.5 inch)
• Device with screw terminals and test sockets: 40 x 115 x 115 mm (1.6 x 4.5 x 4.5 inch)
• Device with spring terminals: 40 x 122 x 115 mm (1.6 x 4.8 x 4.5 inch)
• Number of terminal blocks max. 8

• Device with screw terminals: 40 x 119 x 115 mm (1.6 x 4.7 x 4.5 inch)
• Device with screw terminals and test sockets: 40 x 124 x 115 mm (1.6 x 4.9 x 4.5 inch)
• Device with spring terminals: 40 x 131 x 115 mm (1.6 x 5.2 x 4.5 inch)
• Number of terminal blocks max. 10

• Device with screw terminals: 60 x 119 x 115 mm (2.4 x 4.7 x 4.5 inch)
• Device with screw terminals and test sockets: 60 x 124 x 115 mm (2.4 x 4.9 x 4.5 inch)
• Device with spring terminals: 60 x 131 x 115 mm (2.4 x 5.2 x 4.5 inch)
• Number of terminal blocks max. 15