Advantages of the NI 9237 Over the NI 9219 in Strain Measurements
Hardware: CompactRIO>>Analog Input Modules>>NI 9237, CompactDAQ>>Analog Input Modules>>NI 9219
Problem: I will be using CompactDAQ or CompactRIO to acquire data from a strain gage. My two options for modules are the NI 9237 bridge module and the NI 9219 universal analog input module. What are the advantages that the 9237 has over the 9219?
Solution: Some of the most notable advantages that the 9237 has over the 9219 are:
- The 9237 has a 50 kS/s sampling versus 100 S/s with the 9219.
- The 9237 has several programmable values of excitation up to 10 V whereas the 9219 has a fixed value (2.0 to 2.7 V depending on the Bridge Type and Load Resistance).
- Several types of sensors have a Sense+ and a Sense- output. These sense outputs help reduce the error if your sensor is far away from the 9237. The 9237 has inputs for remote sensing, but the 9219 does not have these inputs so you may have additional error with the 9219.
- The Nominal Range of the 9237 is +/- 25 mV/V, while the 9219 has a Nominal Range of +/- 500 mV/V for the Half Bridge configurations and +/- 62.5 mV/V or +/- 7.8 mV/V for Full Bridge configurations.
In summary, the 9219 universal module is great if you want to perform basic strain measurements that do not require a high sampling rate and if your sensor does not have Sense+ and Sense- outputs, because the 9219 is capable of several other types of analog input. If you do need a higher sampling rate or your sensor does have Sense+ and Sense- outputs, the 9237 is recommended.
Related Links:
Products and Services: NI 9237Products and Services: NI 9219
Attachments:
Report Date: 08/21/2007
Last Updated: 01/17/2008
Document ID: 4CKH1L4G
