The iso685-S is an insulation monitoring device from Bender, part of the ISOMETER® iso685 series. It is designed for unearthed systems (IT systems) to continuously monitor the insulation resistance of AC, three‑phase AC, AC/DC and DC main circuits. This version is a sensor type without display and operating keys; it must be used together with the FP200 front panel.
Technical Specifications
· Rated system voltage (Uₙ): AC / 3(N)AC 0…690 V; DC 0…1000 V
· Frequency range (fₙ): DC, 1…460 Hz
· Insulation resistance measuring range: 1 kΩ … 10 MΩ, two independently adjustable alarm thresholds
· Maximum permissible system leakage capacitance: ≤ 1000 μF (depending on the selected measuring profile)
· Measuring principle: AMPPlus patented measuring method
· Supply voltage (Uₛ): AC/DC 24…240 V (50…400 Hz)
· Alarm relays: Two independent changeover contacts, AC 250 V / 5 A
· Analogue output: Isolated current or voltage output (0(4)…20 mA, 0…400 μA, 0…10 V, 2…10 V)
· Digital I/O: Freely programmable digital inputs and outputs
· Communication interfaces: RS‑485 (BMS / Modbus RTU), Ethernet (Modbus TCP / web server)
· History memory: Real‑time clock, stores up to 1023 alarm messages with date and time stamp
· Operating temperature: –25 °C … +55 °C
· Mounting: DIN rail mounting
· Protection class: Terminals IP20, internal components IP40
· Standards compliance: IEC 61557‑8, IEC 61557‑9, CE
Key Features
· AMPPlus measuring principle – Automatically adapts to system leakage capacitance and DC components, reliably distinguishing actual insulation faults from inherent system capacitance
· Automatic adaptation to system leakage capacitance – Maximum ≤ 1000 μF, optimises measuring time
· Two independently adjustable alarm response values – Range 1 kΩ … 10 MΩ
· Pre‑defined measuring profiles – Power circuit, control circuit, generator, high capacitance, frequency converter, etc.
· Multi‑parameter measurement – Insulation resistance, true RMS system voltage, system frequency, system leakage capacitance
· History memory with real‑time clock – Stores up to 1023 time‑stamped alarm messages
· Analogue output – Isolated 0(4)…20 mA, 0…10 V etc., for connection to PLC or SCADA
· Programmable digital I/O – Flexible control of device status and fault reporting
· Connection monitoring – Continuously monitors measuring leads and earth connection
· Automatic device self‑test – Continuously verifies internal measuring circuits; alarms automatically on fault
· Integrated web server and Modbus TCP – Remote access to device parameters via a web browser
· RS‑485 communication (BMS / Modbus RTU) – Data exchange with other Bender devices or central monitoring systems
· 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)
· UPS and battery systems
· Photovoltaic and renewable energy systems
· Phase‑controlled heating systems
· Switch‑mode power supply (SMPS) installations
· Data centres and telecommunications
· Marine and offshore applications (with FP200W)
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