refrigerator testing solution

[Mohammed.Ashraf]

hello 

we are configuring a solution for refregirators testing and validation

our customer requires the following Sensors and the DAQ solution for it

40   Thermocouples

6     Power Consumption Transducer  

6     Current Transducer 

2     Pressure Transducer 

1     Humidity Transducer 

so we chose the SCXI-1102 32 Thermocouple/Voltage input so we can cover the 40 thermocouples as well as remaining voltage out sensors (e.g. humidity)

i'm not sure how can i acquire the power consumption and current consumption using the same SCXI Chassis , what modules will be needed for such requirements

as well , most pressure transducers returns current so we have to choose a current input module ?

according to customer's info , the Temperature range will be +- 20 Celcius , so is it better to use RTDs rather than thermocouples ?

can anyone advice if the current chosen cards are the best fit for the application ?

Thanks in advance 

Message Edited by Mohammed.Ashraf on 09-08-2009 07:08 PM

[pflores]

Hello Mohammed,

You meant 2x SCXI-1102, right? This way yuo can have 64 channels to work with.

For the Power/Current consumption, do you already have transducers in mind, or do you want to measure the current in the SCXI chassis? Is it AC or DC power/current? What kind of ranges?

For the pressure sensors, the 1102 can also measure currents between 0 and 20 mA. If this does not work for your sensors, you can look at an SCXI-1520 or an SCXI-1503. Also, this may be helpful.

As for thermocouple vs. RTD, the main difference is that RTD's will be more accurate and more pricey. Look here. Depending on your requirements, you can choose accordingly. There are different thermocouple "types" as described in the table here:

http://en.wikipedia.org/wiki/Thermocouple

Hope this helps...