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IRDH575_D00089_05_M_XXEN/01.2020
3. Function
3.1 General characteristics
Four-line LC display
Automatic device self-test
Memory with real-time clock to store all alarm messages with date and
time stamp
RS-485 interface (BMS protocol) for data exchange with other Bender
devices (RS-485 electrically isolated)
Remote setting of certain parameters via the Internet (option;
FTC470XET additionally required)
Option "W":
Improved shock and vibration resistance for use in ships, on rolling
stock and in seismic environment.
3.2 Essential functions of the ISOMETER®
ISOMETER® for IT AC systems with galvanically connected rectifiers and
for IT DC systems (isolated power)
Automatic adaptation to the existing system leakage capacitances
measuring principle (European Patent: EP 0 654 673 B1)
Two adjustable response values in the range 1 kΩ …10 MΩ (Alarm 1/
Alarm 2)
Connection monitoring
Internal disconnection of the ISOMETER® from the IT system to be mon-
itored (using a control signal; terminals F1/F2) , e.g. if several
ISOMETER®s are interconnected.
Current output 0(4)…20 mA (galvanically separated) in relation to the
measured insulation value.
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