Reccomend the best relay for my application

I have a NI USB
9219, 4 Ch-Ch Isolated, 24-bit, ±60V, Universal Analog Input module
which I intend to use for RTD measurement (2 wires) with three pt1000
sensors. However, it is not intended for continuous measurement. I need
to keep the lines+sensor grounded when I don't measure and therefore I
need a TTL (5V-DC) triggered switch/relay to connect them to the NI USB
9219 only when measuring is allowed.
Which switch would you reccomend?
Thank you!

How many wires do your RTDs have (2,3 or 4)? How many wires do you need to disconnect on your RTDs? If you just need to stop the current flow, we only need to disconnect one wire, regardless of the number of wires on your particular RTDs. This will require 4 SPST relays.
9481:
4 mechanical SPST relays, 50mOhm max.
9485:
8 solid state SPST relays, 200mOhm max.
If you're trying to isolate the RTDs for some particular test, we'll
need to disconnect all wires, which would require 8, 12, or 16 SPST
relays (for 2, 3, or 4 wire RTDs). This would require up to 4 9481 modules, which might be cost and space prohibitive.
Note that both of these options simply disconnect the RTD and leave it floating... if we need to ground 1 or more wires, we'll need additional SPST relays (in other words, create an SPDT using two SPSTs).
If PXI is an option, the 31 SPST PXI-2568 is a great option.
If PXI isn't an option, you might consider purchasing the 9476 DO module, which has 32 digital outputs that we could use to drive external relays. Said external relays could be SPDT, so we'd only need 16 channels max... now you can add more RTDs .
If I missed any details on your application, let us know and we'll look at other options.
-John Sullivan
Analog Engineer

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