National Instruments NI 9218, Getting Started, Page: 6 / 22

Channel-to-earth ground (up to 5,000 m)
Continuous 60 VDC, Measurement Category I
Withstand 860 Vrms
Vsup inputs-to-earth ground (up to 5,000 m)
Continuous 60 VDC, Measurement Category I
Withstand 1,000 Vrms, verified by a 5 s dielectric withstand test
Caution
Any excitation output voltage to earth ground must remain
below 60 VDC for each channel. To determine excitation output voltage to
earth ground for a channel, add the maximum excitation voltage to the
maximum potential on pin 3. The maximum excitation voltages are 2 V
+3% and 3.3 V +3% for the bridge excitations, 12 V +5% for the +12 V
excitation, and 22 V for the IEPE excitation.
1
The maximum voltage between pin 2 and pin 3 on a single connector is -20 V to
+30 V.
Safety Guidelines for Hazardous Locations
The NI-9218 is suitable for use in Class I, Division 2, Groups A, B, C, D, T4 hazardous
locations; Class I, Zone 2, AEx nA IIC T4 and Ex nA IIC T4 hazardous locations; and
nonhazardous locations only. Follow these guidelines if you are installing the
NI-9218 in a potentially explosive environment. Not following these guidelines may
result in serious injury or death.
Caution
Do not disconnect I/O-side wires or connectors unless power has
been switched off or the area is known to be nonhazardous.
Caution
Do not remove modules unless power has been switched off or
the area is known to be nonhazardous.
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NI-9218 Getting Started