Cells With Connector S8; Protective Wiring Of Switching Contacts - HACH LANGE si629 C Manual

3. Installation

3.3.2. Cells with connector S8

Important note:
Fit a jumper between terminals 9 and 10 (12 and 13 in panel mount instrument) and another between
the terminals 11 and 12 (14 and 15 in panel mount instrument).

3.4. Protective wiring of switching contacts

Relay contacts are subjected to electrical erosion.
Especially with inductive and capacitive loads, the service life of the contacts will be reduced.
For suppression of sparks and arcing, components such as RC combinations, nonlinear resistors, series
resistors and diodes should be used.
Typical protective wirings
AC applications with inductive load
Load
Contact
relay
Typical RC at 230 VAC: Capacitor 0.1 µF/630 V
Maximum relays load: AC < 24 V / < 3 A / < 72 VA.
si629 C_HACH LANGE_Ed 0510.indd ANG:13 si629 C_HACH LANGE_Ed 0510.indd ANG:13
RC
RC
Resistor 100 Ω/1 W
TERMINALS
si629 C si629 C
(wall mount) (panel mount)
9
10
11
12
DC applications with
inductive load
Diode
1N4007
COLOUR
12 Middle
13 Middle
14 Shield
15 Shield
AC/DC with
capacitive load
Load
R
R, for example:
5 Ω / 1 W at
24 V / 0.4 A
13
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