The first thing you're likely to want to consider is the range of the various differential pressure transmitters that are available. Many people will simply by the transmitter with the largest range, assuming that it will act as an all purpose transmitter and they'll get the most use out of it. This might be true, but it depends largely on what you need it for. It's best to consider your current need, find a transmitter that meets that need, and then see if you can't find one that can also meet a variety of possible future needs as well.
Accuracy is the next thing you'll want to consider when looking through the options of differential digital pressure gauge transmitters. Again, many people assume that the more accurate their transmitter, the better. However, if you don't an extremely high level of accuracy, there's no reason to chose this option. Most transmitters get more expensive the more accurate they are. If you don't have a need for this high level of accuracy, it doesn't make much sense for you to pay for it.
You'll also want to consider the display options on the differential pressure transmitters. One issue will be the number of digits that it will show. Again, you'll want to first narrow it down to options that meet your needs at the moment. Then you'll look at the ones that do, and find the best option out of those. You might consider extras display options, such as a digital read or a back light option. Consider what situation you plan to be in when using your transmitter and you'll likely be able to choose the right option for your needs.
After you've considered the above issues and have found a few differential pressure transmitters that meet your needs, it will be time to consider price. While you might be tempted to do so, don't let yourself simply choose the cheapest option. You want to focus on getting the best value, which means finding the right transmitter for your needs and then getting the best price on that particular piece. This is how you will end up getting your money's worth on your transmitter.
When you're buying differential pressure transmitters, it's worth your time to take a few minutes to consider your options. You want to choose one that has the range you need, the accuracy you need and that has a display that will meet your needs as well. Once you've covered this ground, you can then consider the available options to see which one will offer the price you need.
