Connecting a pH probe (from Hamilton) to the NI-9208

[Iforire]

Dear all,

I am trying to connect an Hamilton pH probe to the NI-9208 module. 

The pH probe is connected to a transmitter (Arc Wi 2G Adapter BT)  and the wiring diagram is this one:

So, I have done the connection like that:

Arc 2G Wifi	NI9208
1	AI0
2	COM
3	AI1
4	COM

7 and 8 are connected to a 24VDC

But it is not workin.... What did I do wrong?

Thanks a lot!!!!

[santo_13 · Accepted solution]

As per your transmitter it needs a power source for the 4-20mA channels.

You must connect as per this diagram (NI-9208 will be your PCS),

Arc 2G Wifi	NI9208
1	+24V
2	AI0
3	+24V
4	AI1

[Iforire]

Thanks a lot Santosh, I'm quite a beginner in all that 🙂

Actually, that's the first thing I've tried, but it seems I did it wrong.

Also I need to connect the COM of the NI-9208 to the GND of the power source, right?

Thank you

[santo_13]

Yes, all three - sensor, transmitter and NI-9208 must share the same GND i.e., COM.

Depending on wiring constraints, this also works,

Arc 2G Wifi	NI9208
1	VSUP
2	AI0
3	VSUP
4	AI1
+24V	VSUP
GND	COM

[Iforire]

Dear all,

That's me again since I have some problem in connecting a Brooks Mass Flow Controller to the same NI-9208 and a NI-9266 for AO.

Please find below the connections for the MFC.

Here is what I did:

MFC	Card	Connection
1	NI-9266	COM0
4	NI-9208	AI1
5		+
7	NI-9266	AO0
9		-
10	NI-9208	COM-17

Is this right?

Or should I connect as for the Hamilton probes like that (as COM-17 is already connected to '-')?

MFC	Card	Connection
1	NI-9266	COM0
4	NI-9208	+
5		+
7	NI-9266	AO0
9		COM-17
10	NI-9208	AI-1

Connecting this stuff is definitely not my forte 😉

Thanks a lot,

Iforire

[santo_13]

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@Iforire wrote:

Dear all,

That's me again since I have some problem in connecting a Brooks Mass Flow Controller to the same NI-9208 and a NI-9266 for AO.

Please find below the connections for the MFC.

Here is what I did:

MFC	Card	Connection
1	NI-9266	COM0
4	NI-9208	AI1
5		+
7	NI-9266	AO0
9		-
10	NI-9208	COM-17

Is this right?

Or should I connect as for the Hamilton probes like that (as COM-17 is already connected to '-')?

MFC	Card	Connection
1	NI-9266	COM0
4	NI-9208	+
5		+
7	NI-9266	AO0
9		COM-17
10	NI-9208	AI-1

Connecting this stuff is definitely not my forte 😉

Thanks a lot,

Iforire

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