IsoTrans® 36/37

For safe-area/hazardous-area isolation of 0 ... 20 mA standard signals without power supply

The Task
Hazardous area normally means systems in constant operation that require highly reliable components. The measuring signals need to be transmitted to the control system outside the hazardous area very accurately to control the processes optimally.


The Problems
Complex systems with power supplies are used for reliable hazardous/safe area isolation combined with electrical isolation for preventing measuring errors.


The Solution
Knick loop-powered isolators for 0 (4) ... 20 mA signal transmission. They are available as isolators with intrinsically safe input or output. Due to their patented design (German patent 3526997), they are considered to be the most reliable solution for isolating standard signals without external power supply.


The Advantages
The IsoTrans® 36 and 37 isolators are not only suitable as highly reliable isolators for normal applications, they also meet the most extreme requirements that can be set for signal isolation. There is no need to wire a power supply.


The Technology
The pioneering TransShield® technology allows specifications that previously could not be implemented:
• Extremely high reliability
• Protective separation, transient protection
• 10 kV test voltage (optional)
• High electromagnetic compatibility
• Extremely low residual ripple and common-mode interference
• Excellent pulse formation
• High transmission accuracy
• SMART transmission
• Hazardous / safe-area isolation
In addition to the analog signals, they also transmit data protocols for SMART transmitters (HART). They allow bidirectional communication from every point of the cabling.


Special type available!


Measure voltage without a power supply
Measuring voltages in the range from 250 to 1200 V DC can be converted into current signals up to 5 mA using a special loop-powered version of the isolator. This allows, for example, the contact wire voltage to be checked easily. Please contact us if you need detailed information on this special model.