Relative humidity, Irradiance, Vibration, pH and density

Hi, I have a question here:

Is there a National Instruments Data Acquisition product compatible with several sensors measuring moisture Relative Irradiance, Vibration, pH and density? If Yes, what are the requirements for each type of sensor compatible with the DAQ product?

1. as a first step, you define your needs. (Range, resolution, refresh rate, traceable accuraty?,..., price)

2. what you need to find sensors (or systems) that fullfill your needs. (According to 1. which can sometimes be difficult )

3. If you have the choice between sensors/systems:

DAQ with input voltage is the most common, some sensors need to 'special' voltage input: low voltage, noise filtering for Thermocouple, pH-sensors at very high impedance if connected without bufferamplifier.

Industrial sensors often come with a 10V output voltage or current loop output (20mA). Usually, they are robust, well specified, come in almost all sorts of flavors... but they are pricey (you get what you pay for)

Vibration sensor want load amplifier or (more common), a current excitation (IEPE).

Type of bridge or sensors magnetoresistifs want a voltage excitation.

Specific gravity sounds like a complete system so perhaps a direct connection to the PC through serial / USB or Ethernet is possible or necessary, but could be a high-resolution DC-accelerometer or a<10$ mems="" with="" a="" i2c="" connection="" that="" would="" need="" a="" digital="" io="">

Irradiance might be something between a LDR/Photdiode and a RADIUS parser...

Next: Do you need it high laptop 24/7, reliable, flexible...?

A PXI system may be required or maybe a multi USB DAQ IO is fine (about two to three orders of price difference )

In any case I'm shure you can do with hardware and LabVIEW

Tags: NI Hardware

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