IW1000, Isolation Monitor

Item number: IW1000

  • Time-optimized pulse measurement method
  • 2 switching outputs, 1 analogue output for optional external pointer instrument 
  • Automatic and manual self-test
  • Acoustic alarm in the event of a device failure
  • Optional versions for rail vehicles and medical technology available

Category: Limit Monitors

Supply Voltage

starting from 909,16 €

including 19% VAT.

There are variations of this item. Please select the variation you wish.


IW1000, Isolation Monitor

The isolation guard IW1000 will be used for insulation monitoring in machines and systems with ungrounded voltage systems. The universal design allows the monitoring of all AC and DC systems.

Usual insulation monitors, which work according to the pulse measuring method, work with a fixed pulse width. This must then be adjusted manually to the discharge capacities. There are also devices in which the pulse width adapts automatically, but with the disadvantage that the measurement time for calculating the insulation resistance and the leakage capacitance only ends when the charging process has subsided. Since this is only the case after 5-6 time constants Tau, long measurement times can result. With the time-optimized measuring method of the IW1000, the insulation resistance and leakage capacitance are calculated after 2 time constants.

Rectified fault currents can e.g. be caused by an insulation fault in a switched-mode power supply. This constant component of the leakage currents can also occur without insulation faults with asymmetrical loading of the positive and negative half-waves. For example, for power control with power controllers that work in phase control (dimmer) or as zero point switches (SSR relays). Even with frequency converters, relatively high directional leakage currents flow due to the steep switching of the system voltage.

With the time-optimized pulse measurement method of the IW1000, direct voltage components on the discharge capacitors are automatically calculated by superimposing a positive and a negative voltage pulse and then calculating the difference.

This measurement method is therefore suitable for AC, AC / DC and pure DC systems.

The insulation monitor is available in various versions for the supply voltage (please select when ordering!)

Technical data:
Supply voltage: 230VAC or 24VAC ±10 %;  
                              16,8...33,6VDC, 10,8..15,6 VDC
Power consumption: max. 4VA
Operating temperature: -10...+55°C;
Relative humidity: <=75% for annua lmean in accordance with DIN EN 50155, 95% for 30 days all year continuously, seldom or low humidity doesn't lead to malfunctions or cancellations.
CE conformity: EN 60664-1, EN 61326-2-4, EN 50121-3-2, EN 60068-2-1/2/6/27
Unom: 0...690VAC/DC; from UN >400V  Operation only permitted with optional cover clamp
Frequency range: 16 2/3...400Hz
Measuring circuit 
Umeas max.: ±40V
Imeas max.: ±220μA
Ri DC: 180 kOhm (2 x 360 kOhm parallel)
Impedance Zi: 180 kOhm (2 x 360 kOhm parallel) at 50Hz
Response values
AL1/AL2: 1 kOhm...5 MOhm x 1,1 (1,1 kOhm...5,5 MOhm) programmable
Accuracy: ±5% ±1 kOhm in the range 1 kOhm...5 MOhm
Hysteresis: 10...100% of the setpoint programmable
System leakage capacity: max. 500μF
Display: LCD Dot-Matrix, 2 lines 8 characters each, character height 5mm, backlit
Indication range: 1 kOhm...9,9 MOhm
1 MOhm...9,9 MOhm: 0,1 MOhm
1 kOhm...999 kOhm: 1 kOhm
Relay SPDT: < 250VAC < 250VA < 5A;
                          < 300VDC < 50W < 2A
Analogue output: 0...1 mA, RF (insulation resistance)
Housing: Makrolon 8020 UL94V-1
Weight: ca. 390g
Connection: screw terminals 4mm²
Protection class: housing IP40, terminals IP20, BGV A3
Optional accessorise:
IS96, external pointer instrument 0-1mA
KA-IW1000-1  terminal cover
Version for rail vehicles
Version for health care facilities

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