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General| Brand | National Instruments |
|---|---|
| Model | NI 9421 |
| Category | Measuring Instruments |
| Language | English |
Guidelines for handling hazardous voltages, including qualified personnel and circuit segregation.
Ensure insulation for human contact and use connector backshell for hazardous voltage safety.
The NI 9421/9423 is suitable for hazardous locations like Class I, Division 2, Zone 2.
Wire disconnection, module removal, component substitution, Zone 2 enclosure, and signal limits.
The NI 9421/9423 provides connections for eight digital input channels.
Explains sinking inputs: DI provides a path to COM for current/voltage.
Specifies channel-to-COM, channel-to-channel, and channel-to-earth ground voltage limits.
Defines Measurement Category II for measurements on directly connected electrical distribution systems.
Do not use screw terminal for measurements within Measurement Categories III or IV.
Specifies channel-to-COM, channel-to-channel, and channel-to-earth ground voltage limits for DSUB.
Defines Measurement Category I for measurements not directly connected to MAINS voltage.
Do not use DSUB for measurements within Measurement Categories II, III, or IV.
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