RKI Instruments SD-705EC - Manual (Page 15)

PT2E-1140
・Be sure to make ground as the instrument is flame proof design.
・Make ground with ground resistance is below 100Ω
・Be sure not to connect ground cable to gas pipes.
WARNING ！
(3 ) Connect alarm relay contacts as following .
SD-705EC
Relay contact terminal
1 st alarm contact
2 nd alarm contact
Trouble alarm contact
6
Trouble contact
is a option
5 3 4 2 1
・Alarm contacts shall be used only for external buzzer and alarm light, and do not use it
for the controlling use (such as solenoid valve control etc).
When control the external load, the bad influence may be given to the system according
to the load characteristics.
In such case, the following countermeasure shall be taken to stabilize the action and
protect the contents.
・Relayed by the low voltage relay and operate by connecting surge absorbing parts(Spark
Killer, Diode, etc) suited for the rating of relay coil directly to relay.
・Add surge absorbing parts to the load side of relay on the request.
The spec for alarm contact is described by the conditions of resistive load.
When use the inductive load for alarm contacts the very high reverse electromotive voltage
may be generated and the following trouble tends to be produced.)
・Contact part of relay is melted adhesively and the contacts can no work.
・As it is big noise, the trouble action may be taken by the reckless drive of CPU.
・The inductive load shall not be used in principle.
・When use the inductive load, make the contact amplification outside, but the
outside relay coil belongs to the inductive load, use the relay driven by the low
voltage and it is protected by an appropriate surge killer.
CAUTION ！
＊As the inductive load, there are following samples.
・Patlight *External relay *Buzzer *Siren *Fan *Fluorescent lamp *Motor etc.
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