BNC Sensor Shield (ISE Probes)

Other Hardware Sensors
1

Hi,
I need to connect some ISE probes (nitrite/ammonia) to arduino via BNC, but so far I couldn't find any BNC shield specific for this kind of probe.
There was a generic one provided by Practical Maker, but they aren't available anymore.
Can anyone please recommend where can I find this BNC sensor shield for arduino or tell if I can use a PH BNC shield the same way?

2

danielrez:
Hi,
I need to connect some ISE probes (nitrite/ammonia) to arduino via BNC, but so far I couldn't find any BNC shield specific for this kind of probe.
There was a generic one provided by Practical Maker, but they aren't available anymore.
Can anyone please recommend where can I find this BNC sensor shield for arduino or tell if I can use a PH BNC shield the same way?

Are we thinking the same thing: BNC, meaning a small coaxial connector? Or something else?

Paul

3

You're needing a high-impedance input for this, possibly with off-set.
These circuits are not that hard to build yourself (just make sure you use a suitable OpAmp for it - and they normally come only in SSOP or VSSOP type packing), or get a pH amplifier board - they do the exact same thing. Take a high-impedance voltage signal as input, and produce a low-impedance voltage output, which can be read directly by the Arduino.
Just to confirm: you are talking about those glass-bulb type of electrodes, right?

1 Like
4

That's right, wvmarle! Sorry if I wasn't enough clear about my doubt.
I'm planning to develop a monitoring system for aquarium and the main sensors are provided by sellers with theirs proper circuit boards ready to be integrated to arduino (PH, DO, Temperature, ORP). But in case of ion selective electrodes (ISE) probes is quite difficult to find non-expensive probes.
So I found a cheaper Ammonia probe at Aliexpress (https://pt.aliexpress.com/item/Shanghai-Leici-PNH3-1-PNH3-1-01-type-ammonia-electrode-PNH3-3-type-ammonia-electrode-ion/32822258011.html?spm=a2g0s.9042311.0.0.TfjkQ1) but there is no support regarding circuit board to proper read it at Arduino.
That's way I'm looking for a BNC sensor shield to read it correctly.
Do you think that by using a PH board will do the same purpose?

1 Like
5

It should work, same type of probe. A pH probe is also an ion sensitive probe, just for a different ion.
Those other probes are indeed pretty expensive...