The iso685‑S‑B is an IEC 61557‑8 compliant insulation monitoring device from Bender, designed for unearthed IT systems. This sensor variant has no built‑in display or operating keys and must be used together with the Bender FP200 front panel for display and parameter setting. The suffix ‑B indicates the ISOnet function for coupled IT systems.
Technical Specifications
· Rated system voltage (Uₙ): AC 0…690 V, 1…460 Hz / DC 0…1000 V
· Supply voltage (Uₛ): AC 24…240 V, 50…400 Hz / DC 24…240 V
· Order number: B91067220
Key Features
· ISOnet function – Internal isolation for coupled IT systems, allowing multiple devices to operate without mutual interference
· AMPPlus measuring principle – Automatically adapts to system leakage capacitance and DC components
· Predefined measurement profiles – Power circuit, control circuit, generator, high capacitance, frequency converter, etc.
· Multi‑parameter measurement – Insulation resistance, true RMS system voltage, frequency, leakage capacitance
· Connection monitoring – Continuously monitors measuring leads and earth connection
· Automatic self‑test – Continuously verifies internal measuring circuits; alarms automatically on fault
· History memory – Real‑time clock stores up to 1023 alarm messages with date/time stamp
· isoGraph trend analysis – Graphical representation of insulation resistance over time
· Analogue output – 0(4)…20 mA, 0…10 V, etc., for connection to PLC or SCADA systems
· Programmable digital I/O – Flexible control of device status and fault reporting
· Communication interfaces – RS‑485 (BMS/Modbus RTU), Ethernet (Modbus TCP, Web server)
· Voltage extension – Can be extended to higher voltage levels with AGH series coupling devices
· De‑energised system monitoring – Powered by an independent supply; monitors even when the main circuit is de‑energised
Typical Applications
· Industrial IT systems
· Medical locations (operating theatres, ICUs)
· Coupled IT systems
· UPS and battery systems
· Photovoltaic and renewable energy systems
· Data centres
· Marine and offshore applications
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