Caution
For Zone 2 applications, install a protection
device between the RS232 signal cables and the
NI 9870 RJ-50 jacks (ports 1 to 4). The device must
prevent the RS232 signal-to-signal or signal-to-COM
voltage from exceeding 35 V if there is a transient
overvoltage condition.
Caution
For Zone 2 applications, install a protection
device between the external power supply and the
NI 9870 V
sup
and COM pins. The device must prevent
the V
sup
-to-COM voltage from exceeding 39 V if there
is a transient overvoltage condition.
Special Conditions for Hazardous Locations Use in
Europe and Internationally
The NI 9870 has been evaluated as Ex nA IIC T4 Gc equipment
under DEMKO Certificate No. 07 ATEX 0626664X and is
IECEx 14.0089X certified. Each NI 9870 is marked II 3G and
is suitable for use in Zone 2 hazardous locations, in ambient
temperatures of -40 °C ≤ Ta ≤ 70 °C. If you are using the NI 9870
in Gas Group IIC hazardous locations, you must use the device in
an NI chassis that has been evaluated as Ex nC IIC T4, Ex IIC
T4, Ex nA IIC T4, or Ex nL IIC T4 equipment.
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NI 9870 Getting Started Guide