Thu Aug 16 06:48:46 2018
Thu Aug 16 06:48:46 2018
ISOMETER® IRDH375
- Insulation monitoring device for AC and DC IT systems
- Application main circuits with connected frequency converters
- According to IEC 61557-8
- Automatic adaptation to the system leakage capacitance
- Info button to display the device setting
The ISOMETER® of the IRDH375(B) series is designed to monitor the insulation resistance of unearthed main circuits (IT systems) AC, AC/DC 0…793 V resp. DC 0…650 V. The AMPPlus measuring principle meets the particular requirements of modern power supplies which often include rectifiers, converters, thyristor-controlled DC drives and directly connected DC components. In these systems often high leakage capacitances against earth occur due to interference suppression measures. The IRDH375(B) automatically adapts itself to the existing system conditions.
In combination with a coupling device, the Isometers can also be used for higher voltages. An external supply voltage allows de-energized systems to be monitored too.
- Features
- Applications
- Accessories
- Ordering information
- Downloads
- Insulation monitoring for unearthed AC, AC/DC systems 0…793 V, DC 0…650 V
- Nominal voltage extendable via coupling device
- Two separately adjustable response values 1 kΩ…10 MΩ
- AMPPlus measurement method
- Automatic adaptation to the system leakage capacitance
- Info button to display device settings and the system leakage capacitance
- Continuous self monitoring, with automatic alarm message
- Automatic self test, selectable
- Connection for external kΩ indication
- Test and reset button
- Connection external test and reset button
- Two separate alarm relays with two potential-free changeover contacts
- N/O or N/C operation
- Alarm relay for system fault (N/C operation)
- Backlit LC display
- RS-485 interface
- Plug-in terminals
- AC, DC or AC/DC main circuits
- AC/DC main circuits with directly connected DC components, such as rectifiers, converters, and thyristorcontrolled DC drives
- UPS systems, battery systems
- Heaters with phase control
- Installations including switch-mode power supplies
- IT systems including high leakage capacitances
- Coupled IT systems
Optional accessories for ISOMETER® IRDH375
External kΩ measuring instruments (400 µA)
External kΩ measuring instrument 20 mA
Transparent front plate cover IP65
Coupling devices
| Type | SKMP *2) | Art. No. |
|---|---|---|
| 7204-1421 | 120 kΩ | B986763 |
| 9604-1421 | 120 kΩ | B986764 |
*2) SKMP = scale centre point
External kΩ measuring instrument 20 mA
| Type | Art. No. |
|---|---|
| 9620-1421 | B986841 |
Transparent front plate cover IP65
| Type | Art. No. |
|---|---|
| 144 x 72 | B98060005 |
Coupling devices
| Type | Nominal system voltage Un | Art. No. |
|---|---|---|
| AGH150W-4 | DC 0…1760 V | B98018006 |
| AGH204S-4 | AC 0…1300 V / 0…1650 V | B914013 |
| AGH520S | AC 0…7200 V | B913033 |
Variants of ISOMETER® IRDH375
| Type | Nominal voltage Un | Supply voltage US | Art. No. |
|---|---|---|---|
| IRDH375-435 | AC 0…793 V / DC 0…650 V* | AC 88…264 V / DC 77…286 V* | B91065000 |
| IRDH375-427 | AC 0…793 V / DC 0…650 V* | AC 19.2…55 V / DC 19.2…72 V* | B91065002 |
| IRDH375B-435 | AC 0…793 V / DC 0…650 V* | AC 88…264 V / DC 77…286 V* | B91065004 |
| IRDH375B-427 | AC 0…793 V / DC 0…650 V* | AC 19.2…55 V / DC 19.2…72 V* | B91065006 |
* absolute values
Device “Option-W” with increased shock and vibration resistance: Indicated by the letter “W” at the end of the order number
Device “Option-W” with increased shock and vibration resistance: Indicated by the letter “W” at the end of the order number
Downloads for ISOMETER® IRDH375
| Category | Product | Language | Date | Size | Download |
|---|