Article number: 70 936
  • HIG97 is a very durable series of insulation monitoring devices for industrial isolated systems (IT systems).
  • They are designed for monitoring the insulation resistance on systems with a high incidence of industrial interference (higher harmonic).
  • They are characterized by an extremely fast response to insulation failure. Fault of insulation resistance is detected within 80 ms.
  • They can be connected to the IT systems up to 3 x 1200 V, using a TL 1200 couppling device.
  • IMDs are designed with independent power supply. That means that these insulation monitors can be powered from a different system than the one they measure. This has the significant effect that the IMDs are able to measure even de-energized system.
  • HIG97 is equipped with a non-flammable measuring circuit, so it is suitable for environments with a risk of explosion (installation in a solid enclosure).
Monitored IT power supply system type according to IEC 61557-8 AC
Measuring range of insulation resistance RF 5 ÷ 900 kΩ
Adjustable range of critical insulation resistance Ran 5 ÷ 300 kΩ
Number of insulation resistance fault levels (Ran)
Rated voltage of monitored IT system (AC) Un 230 V
IMD power supply From measured IT system, From independent power source
Nominal supply voltage AC Us 90 ÷ 265 V
Nominal supply voltage DC Us 120 ÷ 370 V
Power consumption P 5 VA
Measuring voltage Um 18 V
Measuring current Im < 0.48 mA
Measuring input’s internal impedance Zi > 100 kΩ
Measuring accuracy ± 10 %
Electrical strength against internal circuits 3 750 V
Equipped with display Yes (OLED technology)
Supported module of distant signalisation (MDS) MDS-D, MDS-DELTA
Communication interface for user RS485 bus
Communication protocol ISOLGUARD, PROFIBUS
Housing material Polyamid PA6, UL94 V-0
Degree of protection of front panel IP40
Degree of protection except the front panel IP20
Operating temperature ϑ - 10 ÷ 60 °C
Protection class according to IEC 61140 II
Recommended cross-section of connected conductors S 1 mm2
Installation On DIN rail 35 mm
Modular width 4
Operating position Any
Operation type Permanent
Quick contact
Ing. Aneta Sčebelová
 +420 494 942 314