Function
22
IRDH275BM-7_D00123_06_M_XXEN/07.2018
Current output for external measuring instrument
The current output of the ISOMETER® provides 0(4)…20 mA. The current out-
put is galvanically isolated from the device electronics and the RS-485 inter-
face. The ISO SETUP menu, on page 31, allows to switch over between
0…20 mA and 4…20 mA.
Real-time clock
The real-time clock serves as a time base for the memory and self test func-
tions. At first, the correct time and date must be set in the menu "ISO AD-
VANCED". If time and date are not set, a „C“ (clock) is flashing in the standard
display. In the event of a supply voltage failure, time and date will be stored
for at least thirty days.
If the 24 V test is activated in the "ISO ADVANCED" menu, a special time of day
can be selected for the execution of the self test in the menu "TEST: 12:00".
Then a self test will be started automatically once a day exactly at the preset
time. If the 1 h auto test has been selected, the self test is automatically carried
out every full hour.
Error message Meaning Steps to be taken
Connection PE? No low-resistance
connection of the
terminals and
KE to earth (PE)
1. Check wiring of terminal
and KE to earth (PE)
2. Press TEST button
3. Switch the supply voltage off
and on
Device error x Internal device error 1. Press TEST button
2. Switch the supply voltage off
and on
3. Contact Bender
If the on/off switching of the supply voltage is not possible for
technical reasons, a RESET of the process control can be
carried out by pressing the "ESC“, "RESET“ and "MENU“ key.
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