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Thermo Fisher Scientific Alpha DO 1000 User Manual

Page 13

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5

Pt100

RELAY1

L

N

PE

100mA (F)

FUSE 250VAC

HOLD

ALARM

RELAY2

NC

-

+

DO Probe

J2


IMPORTANT: The Alarm relay functions as an “Active Low” device

i.e. it switches OFF under Alarm condition. Therefore the Alarm
display device should be connected to the ‘NC’ contacts of the
relay.