I just got my first opportunity to play with my new Testo smart
probes. The 549i measures pressure and the 515i measures temperature. They are
wireless Bluetooth devices which rely on an app that you load on your smart
phone or tablet. They are part of a complete lineup of wireless Bluetooth
devices that Testo is introducing. I was interested in them because of the low
price point. The 549i and 515i are each around $50. To read both system pressures, the suction
line temperature, and the liquid line temperature simultaneously costs around
$200.
The App
The Testo Smart Probes app interfaces with all of the smart
probes. My first impression is generally positive. Like Testo’s Digital
Manifold Gauges, the software does have a small learning curve. However, once
you get past the initial setup and learning where all the settings are, you can
easily check system pressures, superheat, and subcooling simultaneously. You
can choose from a menu of applications which range from a basic list of each
probe’s output to a software application designed to make a particular job
easier. The software will also do data logging. Each application allows viewing
the information as a list, trending (a graph), or a table. With the graph or
table view, every time the probe updates its reading, that new reading is
plotted on the graph or added to the table. You can export these to pdf, excel
or jpg.
Accuracy
The accuracy is reasonable. For improved accuracy, the 115i temperature
probe uses an NTC sensor rather than a thermocouple. The specification is plus
or minus 1.3° C ( 2.3° F). Its resolution is 0.1, meaning it can display tenths
of a degree. Its range is -40°C to 150°C
( -40°F to 302°F). The 549i pressure probe has an accuracy of plus or minus 0.3
bar (4 psi). The resolution is 0.1, meaning it can display tenths of a pound. The range is -1 to 60 bar (-14 to 870 psi).
In the Shop
The software and Bluetooth worked well with both my i-phone
and my Android tablet. The range seemed fine, I connected to the system and
walked around the shop. The app did drop some of the probes occasionally, but
they always reappeared in a few seconds. This happened even if I was right next
to the probes – so I don’t think it had to do with the Bluetooth range. There
is also a latency in the readings of a few seconds. When I disconnected the
pressure probes the pressure still showed on the screen for a few seconds.
Batteries
What remains to be seen is how long the batteries last. Each
probe uses 3 AAA batteries. It could get a little expensive if I have to
replace batteries a bunch. Also, I know neither my phone nor tablet will go all
day, so to use these in the field a lot I would need to figure out a convenient
way to recharge them.
Wrap up
The exciting part is that these probes bring the wireless
world to you at a very affordable price. Just a good quality thermocouple pipe
clamp that plugs into your multimeter costs $50. The 115i gives you more
functionality and convenience for about the same price. The 549i lets you check
system pressures without filling a manifold or hoses up with refrigerant. And
both allow you to export the data, so you can provide your company and customers
with verification of the system’s performance. Here is link to a web page about the Testo Smart
Probes. https://www.testo.com/en/home/products/smart_probes/smart_probes_heating_1.jsp
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