BENDER ISOMETER® iso685(W)-D/-S Insulation Monitoring Device

Convenient operation: Parameter setting, alarm reset, and self detection can be achieved through buttons such as MENU/TEST/RESET, and support remote parameter modification on web servers (with write permission enabled).

Model specifications and ordering information

（1） Core model parameters

Model Equipment Type Power Supply Voltage Protection Enhancement (Option W) Product Number

Iso685-D with display/button AC/DC 24~240 V No B91067010

Iso685W-D with display/button AC/DC 24~240 V (-40~+70 ℃, anti vibration) B91067010W

Iso685-S+FP200 no display+panel AC/DC 24~240 V No B91067210

Iso685W-S+FP200W without display+panel AC/DC 24~240 V is B91067210W

（2） Key components and coupling equipment

Basic accessories:

Mechanical accessories (terminal cover+mounting clip): B91067903

Screw Terminal Kit: B91067901

Push in terminal kit: B91067902

Front panel (FP200/FP200W): B91067904/B91067904W

Coupling equipment (extended voltage range):

Coupling device model applicable system voltage product number

AGH150W-4 3(N)AC 0~1150 V、DC 0~1760 V B98018006

AGH520S AC/3(N)AC 0~7200 V B913055

AGH204S-4 AC 0~1650 V (with rectifier 0~1300 V) B914013

AGH676S-4 AC 12 kV B913055

Key technical parameters

（1） Power supply and environmental parameters

Project Standard Version W Enhanced Version

Supply voltage range AC/DC 24~240 V (± 30%/± 15% tolerance) same as standard version

Power consumption ≤ 12 W (DC), ≤ 21 VA (AC 50/60 Hz) Same as standard version

Working temperature -25~+55 ℃ -40~+70 ℃ (UL application -40~+65 ℃)

Storage/transportation temperature -40~+70 ℃/-40~+85 ℃ Same as standard version

Protection level: internal IP30, terminal IP20, same standard version

Shell dimensions (width x height x depth) 108 mm x 93 mm x 110 mm as per standard version

Weight<390 g, same as standard version

（2） Measurement system parameters

Measurement parameter range accuracy

Insulation resistance 0.1 k Ω~20 M Ω± 15% (minimum ± 1 k Ω)

AC system voltage 0~690 V (RMS) ± 5% (minimum ± 5 V)

DC system voltage 0~1000 V ± 5% (minimum ± 5 V)

System frequency 0.1~460 Hz ± 1% (minimum ± 0.1 Hz)

Leakage capacitance 0~1000 μ F ± 10% (minimum ± 10 μ F)

DC offset voltage 20 V~1 kV-

Working principle and debugging process

（1） Basic workflow

After the device is connected to the power supply, it automatically starts self detection (15-20 seconds) to detect the internal circuit, measurement circuit, and grounding connection.

After passing the self-test, enter the normal monitoring mode and continuously collect parameters such as system insulation resistance and leakage capacitance.

When the insulation resistance is lower than the set response value, the response delay is activated (can be set to 0-300 seconds), and the corresponding alarm relay and LED indicator are triggered after the delay is over.

After troubleshooting, the parameters are restored to the release value (response value+25% hysteresis), the release delay is initiated, and the relay is reset after completion; When the fault memory is activated, the RESET button needs to be manually pressed to reset.

（2） Debugging process

Initial debugging: Connect the device → Connect the power supply → Run the debugging wizard (set language, date and time, system type, measurement profile, alarm response value) → Perform functional testing (simulate faults through grounding resistance).

Password configuration: Set a 4-digit password in the device menu, and verify it before modifying parameters.

Remote configuration: remotely read measurement values and modify parameters (with write permission enabled) through a web server (input device IP) or Modbus RTU protocol.

Typical application scenarios

Industrial power system: Monitor the insulation status of generators, frequency converters, and transformers to prevent equipment failures caused by insulation degradation.

Emergency power supply system: Insulation monitoring of backup power sources such as UPS and diesel generators to ensure the safety of power supply in emergency situations.

High capacitance scenario: For large leakage capacitance systems such as ships and rail transit, monitoring accuracy is optimized through "high capacitance" measurement profiles.

Low voltage control system: Insulation protection for industrial automation control circuits to prevent damage to sensitive components due to insulation faults.

Medium and high voltage expansion: Equipped with AGH series coupling equipment, monitor the insulation status of medium and high voltage IT systems such as 6 kV and 12 kV.