Kobold DON-05, Operating Instructions Manual

Page: 10 / 48

DON-H
page 10 DON-H
01/0721
7.2.2 Reed Switch Pulse Output (option H0/HA)
The DON reed switch output is a SPST potential free N/O 2-wire output. This is a
passive output so no power is required.
Note: when using the reed switch output the liquid temperature
must not change at a rate greater than 10 ºC per minute (50 ºF
per minute).
Average electrical endurance of switching contact (MTTF – Mean Time To First
Failure):
Max. switching voltage (30 V/10 mA) 5x10
5
switching cycles
Max. current load (20 V/10 mA) 5x10
6
switching cycles
Min. load (<5 V/10 mA) 5x10 8 switching cycles
Switching capacity : Max. 30 V
DC
, max. 20 mA
The individually specified maximum electrical values of the reed switch must
never be exceeded, even for a moment. Higher switching values may reduce the
service life or even destroy the contact.
For capacitive and inductive loads (e.g. via long lines), we recommend the
following protective circuits:
Lamp load with series or parallel Protection with a RC suppressor
resistance to the reed switch. For a.c. current and inductive load.
Protection with a diode Protection with an inductance or
for d.c. current and inductive load. Resistance for capacitive load.