Java Master 2002 Coffee Roaster: Difference between revisions

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Description

This is a Java Master 2002 fluid bed coffee roaster, capable of roasting up to 3.5 lbs green beans per batch.

Loaned Tool

This is an official loaned tool with an active agreement on file accepted by a board member May 8th 2023.

Authorizations

Looking to get authorized? Head on over to our Discord Server in the #Coffee Channel for the latest info!

Roast Profile

Roasting Profiles refer broadly to important parameters and conditions of the roasting process. The roasting process is a process of caramelization and carbonization called a Maillard Reaction. Some important roast parameters include:

Temperature at beginning of roast
Temperature at ending of roast
Total Duration of roast
Rate of Rise in temperature over total duration and specific periods of roast
‘Development’ of roast at specific temperatures during specific sequences of the roast
Degree of ‘crack’ achieved in the bean (i.e. First, Second)
Color achieved
Speed of air cooling of beans (this part is a significant contributor to ‘sweetness’ in the cup)

In general, coffee sugars are made accessible by roasting, but the caramelization process also reduces perceptual sweetness over roast time at a similar degree of roast. Additionally caffeine content lowers over time with off-gassing from longer roasts. Acidity also tends to lessen over time past City+ and into Full City/Second Crack, until carbonic acidity eventually raises in the darkest roasts. Roasters aim for a consistent rate of rise over time, just as with making caramel, so that the caramelization process does not stop and start haltingly, which will reduce perceptual sweetness as well and lead to uneven bean development.

Roasting on the Java Master

Roasting on the Java Master is determined by two separate controlled parameters: hot air temperature and bean temperature. Hot air temperature is set on the left PID controller. It should be adjusted based on the bean weight to be roasted and the desired speed of roast, and is the temperature of the air entering the roast chamber. More beans require more heat to roast at the same speed. Target bean temperature is set on the right PID controller, and corresponds to the temperature of the air exiting the chamber. When this temperature is reached, the machine begins its cool down cycle. Note that this number is a significant underestimate of the actual bean temperature, but it provides an easily measured parameter for when to end the roast. This temperature can also be adjusted while the roast is in progress to prolong or end the roast earlier, but note that the PID controller takes several seconds to recognize the change.

Suggested roasting parameters:

Hot air temperature range is 530-575 F on the controller. For 1-2 lbs, it should be set close to 530 F. For 2-3.5 lbs, it should be set between 540-560.

Target bean temperature can be set between 370-445 F. This parameter determines the darkness of the roast. Suggested starting points for experimentation:

City (first crack complete) - 375 F.
City+ (significant development beyond first crack) - 380 F to 390 F.
Full City (right before second crack) - 400 F (may be higher.)
Full City+ (some but not all beans have gone through second crack - 415 F.
Second crack complete - 420 F.
French roast - 425 F?

Additional efforts are being made for us to be able to ‘log’ roasts as temperature over time graphs, in order to compare roast profiles for individual beans and measure outcomes.

Operation Checklist

Turn Power on
Check (and, if necessary, empty) chaff collector
Turn on exhaust fan (switch on wall to the right of the machine)
Set air and bean temperatures (530 and 400 are good starter numbers)
Put hopper in place over the blower vents
Pour in beans
Make certain the top cap is in place
Turn Heat on
Press the Run button
Hot air heats up beans, eventually beans reach set Bean temperature
Machine turns off heat, cooling water starts, machine continues to blow air to cool down beans
Wait for the machine to stop blowing air.
Pull the handle to dispense beans
Bag the beans
Turn off Heat and Power switches
Turn off exhaust fan

If you are in a hurry and don't want to wait for the machine to cool the beans down:

Wait for bean temp to drop below 370 F, at which point yellow Reset lamp lights.
Press the Stop button.
Pull the handle to dispense beans into hopper immediately after the beans stop moving. (Leaving them sit still too long is a fire risk.)
Give the beans a sideways shake in the hopper and let the air vents under the hopper cool the beans.

Safety

Never run a roast unattended! (Please!)
Do not roast anything other than green coffee beans.
Roasting beans that already have been roasted is a fire hazard.
Minimum and maximum load are 1 - 3.5 lbs green beans.
Make sure the chaff collector has adequate space. Empty it regularly.
Do not operate without water (this is permanently installed now so it should be fine.)
Do not operate without the exhaust blower turned on.
Beans above 300 F, without cooling air flow or not in motion in the roaster, can catch fire. Stopping the roast is therefore bad. A power outage during a roast is also bad. The roast should be allowed to complete.
The roast can safely be stopped once bean temperature reaches the target, the cooling cycle engages, and the beans drop to 370 F. When this happens, the yellow Reset light will illuminate. Beans can be allowed to cool in the chamber, or the roast stopped with the Stop button and the beans then immediately dumped into the cooling hopper by using the lever. Fans on the tabletop in front of the roaster will blow cooling air over the roast beans. Beans will cool in the hopper via cooling fans within about 3-4 minutes after roast.
A manual valve is located on the left side of the machine, which will trigger a water sprayer to flood the chamber. Use this only in case of a bean fire in the chamber.
Should temperature rise in the chamber uncontrollably, the system will automatically engage the water sprayer. Disable, when any fire is put out, with the Reset button.
No roast should take more than 15 minutes. A timer will halt a roast after 15 minutes. Larger quantities of beans roasted darker may need higher air temperature to ensure the target is reached before 15 minutes.
The front external parts of the roaster may get very hot in operation, especially continuous operation. Do not touch hot metal. Please.
Do not use the roaster for high volume commercial production. This is expensive and on loan. Let’s not PS1 it, okay?

List of Currently Authorized Users

This list has been migrated to Deep Harbor. If you don't see your authorization listed in your profile in the member portal, please reach out on Discord!

Archived List of Authorized Users

Qualified Member	Trained By	Date	Updated in DH
Theo Tetzlaff	Owner/Why would I do this to myself?		X
Riley Pierce	Danger Committee/Manager/Trainer/BAMF		X
Carl Karsten	Riley Pierce	11/9/22	X
Ron Olson	Riley Pierce	11/16/22	X
Dan Wells	Riley Pierce	11/16/22	X
James Lamken	Riley Pierce	11/16/22	X
Claire Fiorino	Theo Tetzlaff	11/20/22	X
Ian Sampson	Theo Tetzlaff	11/20/22	X
Joseph Staffa	Riley Pierce	12/14/22	X
Andrew Wingate	Riley Pierce	1/3/23	X
Elizabeth Koprucki	Riley Pierce	1/4/23	X
William Shehan	Riley Pierce	1/5/23	X
Laura Sparks	Riley Pierce	1/5/23	Not found
Patrick Mahon	Theo Tetzlaff	1/18/23	X
Ryan Mata	Riley Pierce	2/8/23	X
Dan Walsh	Riley Pierce	3/1/23	X
Ryan Helsing	Riley Pierce	3/29/23	X
David Earl	Theo Tetzlaff	Riley Pierce (refresher 9/8/23)	X
Jordan Kessel	Theo Tetzlaff	4/16/23	X
Aaron VerDow	Theo Tetzlaff	4/16/23	X
Jonathan Bisson	Theo Tetzlaff	5/3/23	X
Lucas Alvarez	Theo Tetzlaff	5/3/23	X
Bryan Sills	Theo Tetzlaff	5/3/23	X
Adam Stafford	Riley Pierce	5/17/23	X
James Nowell	Riley Pierce	6/7/23	X
Paulina Hubli	Riley Pierce	7/1/23	X
David Henderson	Riley Pierce	7/23/23	X
Jim Leonardson	Riley Pierce	9/13/23	X
Elizabeth Braun	Riley Pierce	9/13/23	X
Matthew Gaffney	Riley Pierce	9/13/23	X
Tam Ragatz	Riley Pierce	9/13/23	X
Stephen Metzel	Riley Pierce	9/27/23	X
Scott Yoder	Riley Pierce	9/27/23	X
Paul Johnson	Riley Pierce	11/13/23	X
John Jegerski	Riley Pierce	11/13/23	X
Nathan Dietz	Riley Pierce	11/13/23	X
Dan Tan	Riley Pierce	11/13/23	X
Burton Kent	Riley Pierce	12/9/23	X
Brent Myers	Riley Pierce	1/10/24	X
Molly Williford	Riley Pierce	1/10/24	X
Thomas Repasky	Riley Pierce	1/10/24	X
Saad Ali	Riley Pierce	1/10/24	X
Cris Sievenpiper	Riley Pierce	1/10/24	X
Nick Hawley	Riley Pierce	7/29/24	X
Eric Brodersen	Riley Pierce	7/29/24	X
Joshua Woodard	Riley Pierce	7/29/24	X
Cameron Petti	Riley Pierce	7/29/24	X
Eric Parsons	Riley Pierce	7/29/24	X
Books	Riley Pierce	10/17/24	X
Joe Somers	Riley Pierce	10/17/24	X
Caleb Schemmel	Riley Pierce	10/17/24	X
Eric Schoonhoven	Riley Pierce	1/5/25	X
Benjamin Klosky	Riley Pierce	1/5/25	X
Kevin wolff	Riley Pierce	1/28/25	X
Breezy Fasano	Riley Pierce	1/28/25	X
Janais Peace	Riley Pierce	1/28/25	X
Ren Blanding	Riley Pierce	1/28/25	X
Carlos Aranibar	Riley Pierce	1/28/25	X
Cameron Murphy	Riley Pierce	5/13/25	X
Moid Ali	Riley Pierce	5/13/25	X
Adam Henderson	Riley Pierce	5/13/25	X
David Carlson	Riley Pierce	5/13/25	X
Lucas Nelson	Riley Pierce	5/13/25	X
Daf Miller	Riley Pierce	9/28/25	X
Jack Van Boom	Riley Pierce	9/28/25	X
Jack Galbraith	Riley Pierce	9/28/25	X
Wren Parker	Riley Pierce	9/28/25	X
Mickey Price	Riley Pierce	11/10/25	X
Knute Martell	Riley Pierce	11/10/25	X
Dave Ciepluch	Ron Olson	1/11/26	X
Sam Dreyfuss	Riley Pierce	1/24/26	X
Andrew Hromadka	Riley Pierce	1/24/26	X
Stephen Seyer	Riley Pierce	2/3/26	X
Bram Kineman	Riley Pierce	2/3/26	X
Jesse Bernstein	Riley Pierce	2/22/25	X
Ethan Jantz	Riley Pierce	2/22/25	X

Green Coffee Bean Suppliers

Sahar International Supermarket - Albany Park (2 miles North of PS1) 4851 N Kedzie Ave, Chicago, IL 60625 - http://saharbrand.com/
JavaMaster - Sells in 3.5, 10, and 40 lbs quantities.
Sweet Maria’s - Sells in 1, 2, 5, 10, and 20 lbs quantities.
Coffee Shrub - Larger volume sister company to Sweet Maria’s.
Isabella Imports - Sells in 1 lb increments. A Galena, IL based company that has some interesting selections.
Dean’s Beans - Some good selections available.
Amazon, gourmet foods section - yes… Amazon.
Coffee & Tea Exchange - Local Chicago store on Broadway that will sell green beans.

Please note, of these, I really can’t stress enough how generally superior and much more transparent + informative I find Sweet Maria’s compared to everywhere else. -Theo

Sweet Maria’s is great for the beginning roaster because they provide highly detailed cupping notes, suggestions on what level of roast to use, and their opinion on whether something would make good espresso. But the quality of the beans is a function of the grower, not the importer, and a big part of this adventure is discovery and experimentation. So I’d suggest eventually branching out and trying other importers once you have some experience under your belt. -Riley’'

Maintenance

Task	Date	Done by	Notes
Clean two exhaust thermocouples	2/3/26	Riley
	10/17/24	Riley
	12/30/23	Ron and Riley
	07/23/23	Riley and David Henderson
	05/27/23	Riley
	10/26/22	Ron and Riley
Clean glass chamber	2/3/26	Riley
	12/30/23	Ron and Riley
	07/23/23	Riley and David Henderson
	02/20/23	Theo
	12/21/22	Riley
	10/24/22	Theo and Riley	Spot cleaning only
Clean upper duct	12/21/22	Riley	Spot cleaning only
	10/24/22	Theo and Riley	Spot cleaning only
Vacuum clean air intake filter	10/26/22	Riley
Clean lower dump valve	12/21/22	Riley	Spot cleaning only
	10/24/22	Theo and Riley	Spot cleaning only
Replace upper chamber gasket	12/21/22	Riley
Clean hot air thermocouple	10/26/22	Riley

Nota Bene:

We have replacement gaskets and seals now for the roast chamber + venting tubes, etc.
Chaff collector should be checked regularly, depending on frequency and scale of roasting. Not a big deal, but consider checking chaff collector before a new roasting session and/or after roasting several times in succession with beans that give off more chaff [e.g., ‘washed’ beans].

Technical Details

The roaster uses a Watlow PID controller (on the left) to control air temperature. It outputs a process value (4-20 mA), which an Avatar Instruments power controller uses to change the power to the heater via SCR phase dimming. The Avatar supports 240 V but the heater itself only can handle 208 V. This machine was designed to operate on 208 V but JavaMaster confirms it can operate on 240 V with an adjustment. Originally, JavaMaster suggested we limit the PID to 70% max output power. But that resulted in unexplained oscillations in temperature typically +/- 30 F. The Avatar includes an optional feature to limit output voltage via the V-LIM trim pot. This was adjusted so 100% on the PID corresponds to 208 V as measured by a true RMS voltmeter. If the machine is ever operated at 208 V again, it will require re-adjustment of this trim pot.

It seems the main fuse has fallen out of the fuse block in the past. We are looking for a better way to secure it.

If a roast is stopped before cooldown completes, it is possible that the PLC will get confused about roast state, and the next roast will not shut itself down. If a roast is ever aborted before cooldown, SHUT DOWN THE MACHINE before powering up and running another roast.

Java Master 2002 Coffee Roaster: Difference between revisions

Latest revision as of 20:00, 27 February 2026

Contents

Description

Loaned Tool

Authorizations

Roast Profile

Operation Checklist

Safety

List of Currently Authorized Users

Green Coffee Bean Suppliers

Maintenance

Technical Details

Navigation menu

Page actions

Page actions

Personal tools

Navigation

Search

Tools

@@ Line 20: / Line 20: @@
 === Loaned Tool ===
 This is an official loaned tool with an active agreement on file accepted by a board member May 8th 2023.
+=== Authorizations ===
+Looking to get authorized? Head on over to our [https://discord.com/channels/1270929620224704544/1276032751363162112 Discord Server in the #Coffee Channel] for the latest info!
 == Roast Profile ==
@@ Line 66: / Line 69: @@
 * Hot air heats up beans, eventually beans reach set Bean temperature
 * Machine turns off heat, cooling water starts, machine continues to blow air to cool down beans
-* Wait for bean temp to drop below 370 F, at which point yellow Reset lamp lights
+* Wait for the machine to stop blowing air.
+* Pull the handle to dispense beans
-* The operator can dump the beans now, or continue to cool the beans in the chamber. To dump:
-** Press the Stop button.
-** Pull the handle to dispense beans into hopper immediately after the beans stop moving. (Leaving them sit still too long is a fire risk.)
-** Give the beans a sideways shake in the hopper and let the air vents under the hopper cool the beans.
 * Bag the beans
 * Turn off Heat and Power switches
 * Turn off exhaust fan
+If you are in a hurry and don't want to wait for the machine to cool the beans down:
+*Wait for bean temp to drop below 370 F, at which point yellow Reset lamp lights.
+*Press the Stop button.
+*Pull the handle to dispense beans into hopper immediately after the beans stop moving. (Leaving them sit still too long is a fire risk.)
+*Give the beans a sideways shake in the hopper and let the air vents under the hopper cool the beans.
 == Safety ==
@@ Line 91: / Line 99: @@
 * The front external parts of the roaster may get very hot in operation, especially continuous operation. Do not touch hot metal. Please.
 * Do not use the roaster for high volume commercial production. This is expensive and on loan. Let’s not PS1 it, okay?
 == List of Currently Authorized Users ==
+This list has been migrated to Deep Harbor. If you don't see your authorization listed in your profile in the member portal, please reach out on Discord!
+<div class="toccolours mw-collapsible mw-collapsed">'''Archived List of Authorized Users
+<div class="mw-collapsible-content">
 {| class="wikitable" border="1"
 ! Qualified Member
 ! Trained By
 ! Date
+!Updated in DH
 |-
 |Theo Tetzlaff
 |Owner/Why would I do this to myself?
 |
+|X
 |-
 |Riley Pierce
 |Danger Committee/Manager/Trainer/BAMF
 |
+|X
 |-
 |Carl Karsten
 |Riley Pierce
 |11/9/22
+|X
 |-
 |Ron Olson
 |Riley Pierce
 |11/16/22
+|X
 |-
 |Dan Wells
 |Riley Pierce
 |11/16/22
+|X
 |-
 |James Lamken
 |Riley Pierce
 |11/16/22
+|X
 |-
 |Claire Fiorino
 |Theo Tetzlaff
 |11/20/22
+|X
 |-
 |Ian Sampson
 |Theo Tetzlaff
 |11/20/22
+|X
 |-
 |Joseph Staffa
 |Riley Pierce
 |12/14/22
+|X
 |-
 |Andrew Wingate
 |Riley Pierce
 |1/3/23
+|X
 |-
 |Elizabeth Koprucki
 |Riley Pierce
 |1/4/23
+|X
 |-
 |William Shehan
 |Riley Pierce
 |1/5/23
+|X
 |-
 |Laura Sparks
 |Riley Pierce
 |1/5/23
+|Not found
 |-
 |Patrick Mahon
 |Theo Tetzlaff
 |1/18/23
+|X
 |-
 |Ryan Mata
 |Riley Pierce
 |2/8/23
+|X
 |-
 |Dan Walsh
 |Riley Pierce
 |3/1/23
+|X
 |-
 |Ryan Helsing
 |Riley Pierce
 |3/29/23
+|X
 |-
 |David Earl
 |Theo Tetzlaff
 |Riley Pierce (refresher 9/8/23)
+|X
 |-
 |Jordan Kessel
 |Theo Tetzlaff
 |4/16/23
+|X
 |-
 |Aaron VerDow
 |Theo Tetzlaff
 |4/16/23
+|X
 |-
 |Jonathan Bisson
 |Theo Tetzlaff
 |5/3/23
+|X
 |-
 |Lucas Alvarez
 |Theo Tetzlaff
 |5/3/23
+|X
 |-
 |Bryan Sills
 |Theo Tetzlaff
 |5/3/23
+|X
 |-
 |Adam Stafford
 |Riley Pierce
 |5/17/23
+|X
 |-
 |James Nowell
 |Riley Pierce
 |6/7/23
+|X
 |-
 |Paulina Hubli
 |Riley  Pierce
 |7/1/23
+|X
 |-
 |David Henderson
 |Riley Pierce
 |7/23/23
+|X
 |-
 |Jim Leonardson
 |Riley Pierce
 |9/13/23
+|X
 |-
 |Elizabeth Braun
 |Riley Pierce
 |9/13/23
+|X
 |-
 |Matthew Gaffney
 |Riley Pierce
 |9/13/23
+|X
 |-
 |Tam Ragatz
 |Riley Pierce
 |9/13/23
+|X
 |-
 |Stephen Metzel
 |Riley Pierce
 |9/27/23
+|X
 |-
 |Scott Yoder
 |Riley Pierce
 |9/27/23
+|X
 |-
 |Paul Johnson
 |Riley Pierce
 |11/13/23
+|X
 |-
 |John Jegerski
 |Riley Pierce
 |11/13/23
+|X
 |-
 |Nathan Dietz
 |Riley Pierce
 |11/13/23
+|X
 |-
 |Dan Tan
 |Riley Pierce
 |11/13/23
+|X
 |-
 |Burton Kent
 |Riley Pierce
 |12/9/23
+|X
 |-
 |Brent Myers
 |Riley Pierce
 |1/10/24
+|X
 |-
 |Molly Williford
 |Riley Pierce
 |1/10/24
+|X
 |-
 |Thomas Repasky
 |Riley Pierce
 |1/10/24
+|X
 |-
 |Saad Ali
 |Riley Pierce
 |1/10/24
+|X
 |-
 |Cris Sievenpiper
 |Riley Pierce
 |1/10/24
+|X
 |-
 |Nick Hawley
 |Riley Pierce
 |7/29/24
+|X
 |-
 |Eric Brodersen
 |Riley Pierce
 |7/29/24
+|X
 |-
 |Joshua Woodard
 |Riley Pierce
 |7/29/24
+|X
 |-
 |Cameron Petti
 |Riley Pierce
 |7/29/24
+|X
 |-
 |Eric Parsons
 |Riley Pierce
 |7/29/24
+|X
 |-
 |Books
 |Riley Pierce
 |10/17/24
+|X
 |-
 |Joe Somers
 |Riley Pierce
 |10/17/24
+|X
 |-
-|Caleb Schemmer
+|Caleb Schemmel
 |Riley Pierce
 |10/17/24
+|X
 |-
 |Eric Schoonhoven
 |Riley Pierce
 |1/5/25
+|X
 |-
 |Benjamin Klosky
 |Riley Pierce
 |1/5/25
+|X
 |-
 |Kevin wolff
 |Riley Pierce
 |1/28/25
+|X
 |-
 |Breezy Fasano
 |Riley Pierce
 |1/28/25
+|X
 |-
 |Janais Peace
 |Riley Pierce
 |1/28/25
+|X
 |-
 |Ren Blanding
 |Riley Pierce
 |1/28/25
+|X
 |-
 |Carlos Aranibar
 |Riley Pierce
 |1/28/25
+|X
 |-
 |Cameron Murphy
 |Riley Pierce
 |5/13/25
+|X
 |-
 |Moid Ali
 |Riley Pierce
 |5/13/25
+|X
 |-
 |Adam Henderson
 |Riley Pierce
 |5/13/25
+|X
 |-
 |David Carlson
 |Riley Pierce
 |5/13/25
+|X
 |-
 |Lucas Nelson
 |Riley Pierce
 |5/13/25
+|X
+|-
+|Daf Miller
+|Riley Pierce
+|9/28/25
+|X
+|-
+|Jack Van Boom
+|Riley Pierce
+|9/28/25
+|X
+|-
+|Jack Galbraith
+|Riley Pierce
+|9/28/25
+|X
+|-
+|Wren Parker
+|Riley Pierce
+|9/28/25
+|X
+|-
+|Mickey Price
+|Riley Pierce
+|11/10/25
+|X
+|-
+|Knute Martell
+|Riley Pierce
+|11/10/25
+|X
+|-
+|Dave Ciepluch
+|Ron Olson
+|1/11/26
+|X
+|-
+|Sam Dreyfuss
+|Riley Pierce
+|1/24/26
+|X
+|-
+|Andrew Hromadka
+|Riley Pierce
+|1/24/26
+|X
+|-
+|Stephen Seyer
+|Riley Pierce
+|2/3/26
+|X
+|-
+|Bram Kineman
+|Riley Pierce
+|2/3/26
+|X
+|-
+|Jesse Bernstein
+|Riley Pierce
+|2/22/25
+|X
+|-
+|Ethan Jantz
+|Riley Pierce
+|2/22/25
+|X
 |}
+</div></div>
 == Green Coffee Bean Suppliers ==
@@ Line 373: / Line 518: @@
 |-
 |Clean two exhaust thermocouples
+|2/3/26
+|Riley
+|
+|-
+|
 |10/17/24
 |Riley
@@ Line 398: / Line 548: @@
 |-
 |Clean glass chamber
+|2/3/26
+|Riley
+|
+|-
+|
 |12/30/23
 |Ron and Riley