The ISOMETER® isoRW685W-D is an insulation monitoring device for IT systems in accordance with IEC 61557-8 for railway applications and has been specifically tested according to DIN EN 50155. It is universally applicable in AC, 3(N)AC, AC/DC and DC systems. AC systems may include extensive DC-supplied loads (such as rectifiers, inverters, variable-speed drives).

• AC, DC or AC/DC main circuits
• AC/DC main circuits with directly connected DC components, such as rectifiers, converters, variable-speed drives
• UPS systems, battery systems
• Heaters with phase control
• Systems with switch-mode power supplies
• IT systems with high leakage capacitances

• ISOMETER® for IT AC systems with galvanically connected rectifiers or inverters and for IT DC systems (IT = unearthed systems)
• Nominal system voltage Un expandable via coupling devices
• Automatic adaptation to the existing system leakage capacitance
• Combination of AMPPlus and other profilespecific measurement methods
• Two separately adjustable response value ranges of 1 kΩ…10 MΩ for alarm 1 and alarm 2
• High-resolution graphic LC display for excellent readability and recording of the device status
• Connection monitoring (monitoring of the measuring lines)
• Automatic device self test
• Graphical representation of the insulation resistance over time (isoGraph)
• History memory with real-time clock (buffer for three days) for storing 1023 alarm messages with date and time
• Current and voltage output 0(4)…20 mA, 0…400 μA, 0…10 V, 2…10 V (galvanically separated) which is analogous to the measured insulation value of the system
• Freely programmable digital inputs and outputs
• Remote setting via the Internet or Intranet (Webserver / Option: COMTRAXX® Gateway)
• Worldwide remote diagnosis via the Internet (made available by Bender Service only)
• RS-485/BS (Bender sensor bus) for communication with other Bender devices
• BCOM, Modbus TCP and web server