ENSIM SENSORS EFS Operating Manual page 6

2.5 . Reed Relay and Protection Circuit
Inductive Load
When reed switch is used for loads such as electromagnetic relay ,contactor or solenoid, reed switch may be exposed to very high
voltage depending on value of inductive load. This causes either failure of switch or shortening its service life. Therefore, it is
recommended to be used as follows depending on used voltage, for the purpose of protection of switch.
Inductive Load
DC
Diod
Capacitive Load
When reed switch is used with capacitive load, it may cause that high current passes over reed switch, depending on value of
capacity during Charge –'96 Discharge of capacity. So this may cause failure of switch. It is recommended to be used as follows
depending on used voltage, for the purpose of protection of switch.
Black
Blue
When there is flow, factory settings of the flow switch is normally closed.
When flow stopped, contact is open.
Glass Tube
Inert Gas
Inductive Load
AC
Neon Lamp
AC
Relay Position
NC NO
15
35
Contact
Wire
Magnetic Reed
C R
R
AC
Reed Relay
SPST-NO
Single Pole-Single Throw
Normally Open
SPST-NC
Single Pole-Single Throw
Normally Closed
SPDT-NO/NC
Single Pole-Double Throw
Open / Closed Contact
6
Inductive Load
AC
Varistor
C
R
NC
NO