Hi, I'm Pedro from Coffee Parts
And today we're looking at the Pesado TPD
temperature pressure device.
We're going to look in this video
at what this device is, how to use it.
And if you're not getting the result, you want, what to do about it.
So first things first.
So what is this?
This is a portafilter with a thermometer and a pressure gauge
to measure your coffee at the group of the machine.
Now, the reason
this is important is there's a lot of variables
that go into coffee
from when you buy the beans, how you grind tamp dose and run into your machines.
And one of the variables is both temperature and pressure
machines have gauges,
but generally that gauge
it depends where the line of the pump pressure is being fed from.
So that gauge can be right at the pump or somewhere down the line,
generally not in the group head.
And when it comes to temperature, depending on which machine you have,
it's often going to be a pressure
that what you won't really have a gauge for or PID
but once again, your generally measuring that PID
in the boiler and it's not reflective of what's coming out of the group head.
And when you're running coffee, depending on the coffee you want,
you're going to want
a particular pressure and temperature to set 8 bars at 91 degrees.
So you need a tool like this to know what's happening at the group head
and what changes you can do in the machine to reflect this.
So putting this into a machine, basically you just lock it into your portafilter
and run the group.
So we've got the Pesado TPD, and what we're trying.
To do is measure the temperature and the pressure at the group head.
We've got the Acaia Lunar scale here on the self taring, which automatically
which automatically start to time it
because we want about 1 mil per second
to get that measurement correct.
Just putting in the cup,
bringing up the group, we've got the time it just started and
as we go through, we say we're just sitting on the 9 bars.
And both on the machine and the group head.
So it's sitting quite right
the temperature now, just getting into a bit over 90 degrees
once again, kind of where we want it.
It really depends on your set up though
and we'll get a bit more into adjusting it after.
So we got the head basically running at 91 degrees on nine bars.
There is a flow rate control so you can turn it off
to measure the pure pressure at the group head to say like if you are back flushing
and you can open the flow which you want about it to be flowing at about
one ml per second to work out the correct temperature,
the best way to do that is using a scale like the Acaia Lunar
where you can step into the auto tar and timing function.
Now if you did get this and you're not getting the result,
you require to just say your temperature is too low to high there.
There's a few things you can do to adjust.
It really depends on what machine you have generally
and when it comes to adjusting your pump pressure
So there's two different styles of pumps.
There's the rotary pumps and you vibrating pumps.
Technically there's also geared pumps, but there are a whole different ball game
with your rotary pump if you do need to adjust them.
They generally have a needle valve here on the side and you adjust needle a valve.
It basically opens and closes the valve in here, allowing more water through.
So if you think about it's a pump moving a shot and pushing water.
So the needle valve here adjusts the flow and that flow directly ends up affecting
your group head.
On vibrating pumps
it's slightly different
to common styles of vibrating pumps are like the Fluidotech
And you're Orca. Now, these pumps, you can't adjust.
The way you adjust them is generally with a bypass valve.
And on the bypass valve, it's got a little adjustment.
So on this one's actually here at the top and it allows portion of it
back into the tank and portion of it to the group.
And so by adjusting the bypass, you adjust your pressure at the group head
and that's how you adjust your pump side or your, your pressure at the group head.
If it's a rotary or vibrating pump, once again,
this is more of a job of a technician, but in many cases it is easy to do
like on a lot of domestic high end machines, the pump sits sideways.
So that the adjustment on the valve actually pops
through the bottom of the machine so you can get a little screwdriver
and turn it.
The vibrating pumps is more of an internal thing.
When it comes to temperature at the group.
It depends on which machine you have, whether it's a dual boiler, multi boiler machine
or a heat exchange.
But they're generally going to come
and be adjusted by one or two things either a pressure stat
or a PID
If it's a PID, it's super easy.
It's a little digital display.
You got an up and down arrow and they go on some machines, they're external.
So on the La Marzocco, it's a little dial under it
on a Rocket a lot of times it's behind the drip tray or on the front of the machine and etc.
They're generally super accessible
if it's a pressure stat they're in the inside the machine.
But once again, they're easily adjustable
two common types of pressure stats are your bigger ones,
which are something like this in this case it's made by Asco, but they're also made
by Sirai and Parker or your smaller ones like this
they're your Maters
or CME there's quite a few different brands that makes these
little ones and the adjustment is simple.
There's a little dial on them with a screwdriver.
You just turn them.
So in the little ones are up here on the big ones
once again, they're at the top just here and it is easily dialed in.
But you do need the Pesado TPD or a similar product
to know what's happening at the group head when you do adjust these
because the displays on the coffee machines
really showing you what's happening in the boiler,
it's relevant, but it's good to know both.
Thank you for watching this video on the Pesado TPD.
I hope it brought some context into why you need to measure temperature
and pressure the group head it and I found that informative.
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