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Java Master 2002 Coffee Roaster (view source)

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{{Template:EquipmentPage
 
{{Template:EquipmentPage
 
|owner = Theo Tetzlaff
 
|owner = Theo Tetzlaff
−
|hostarea = General Area
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|Loaned Tool Agreement = yes
 +
|hostarea = Kitchen
 
|certification = yes
 
|certification = yes
 
|hackable = no
 
|hackable = no
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|serial = 2736
 
|serial = 2736
 
|arrived = June 2022
 
|arrived = June 2022
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|where = General Area
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|where = Kitchen
 
|doesitwork=yes
 
|doesitwork=yes
 
|contact = Theo Tetzlaff
 
|contact = Theo Tetzlaff
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== Description ==
 
== Description ==
 
This is a Java Master 2002 fluid bed coffee roaster, capable of roasting up to 3.5 lbs green beans per batch.
 
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.
    
== Roast Profile ==
 
== 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:
 
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 beginning roast
+
* Temperature at beginning of roast
−
* Temperature ending roast
+
* Temperature at ending of roast
 +
* Total Duration of roast
 
* Rate of Rise in temperature over total duration and specific periods 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
 
* ‘Development’ of roast at specific temperatures during specific sequences of the roast
−
* Total Duration of the roast
   
* Degree of ‘crack’ achieved in the bean (i.e. First, Second)
 
* Degree of ‘crack’ achieved in the bean (i.e. First, Second)
 
* Color achieved
 
* Color achieved
−
* Speed of cooling
+
* 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.
+
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'''
   −
Roasting on the Java Master is determined by two PID 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.
+
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:
 
Suggested roasting parameters:
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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.
 
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 point:
+
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 (first crack complete) - 375 F.  
−
* City+ (significant development beyond first crack) - 380 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.
   −
We don't have experience yet with darker roasts. More data would be appreciated!
+
== Operation Checklist ==
   −
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.
+
* Get stuff ready:
 +
** Get hopper, funnel, bags from Kitchen
 +
** Weigh beans (Kitchen has a scale)
 +
* Turn Power on
 +
* Turn Heat 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
 +
* Put hopper in place over the blower vents
 +
* Pour in beans
 +
* Make certain the top cap is in place
 +
* 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 bean temp to drop below 370 F, at which point yellow Reset lamp lights
 +
* 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
 +
* Return hopper, funnel, and supplies
    
== Safety ==
 
== Safety ==
   −
* '''Never run a roast unattended!'''
+
* '''Never run a roast unattended!''' (Please!)
 
* Do not roast anything other than green coffee beans.  
 
* Do not roast anything other than green coffee beans.  
 
* Roasting beans that already have been roasted is a fire hazard.
 
* Roasting beans that already have been roasted is a fire hazard.
 
* Minimum and maximum load are 1 - 3.5 lbs green beans.
 
* Minimum and maximum load are 1 - 3.5 lbs green beans.
 
* Make sure the chaff collector has adequate space. Empty it regularly.
 
* Make sure the chaff collector has adequate space. Empty it regularly.
−
* Do not operate without the water connected, the valve on, and the hose not kinked.
+
* 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.
 
* 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 presding the lever open. 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 3-5 minutes after roast.
+
* 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.'''
 
* '''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.
 
* 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.
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|-
 
|-
 
|Theo Tetzlaff
 
|Theo Tetzlaff
−
|Owner
+
|Owner/Why would I do this to myself?
 
|
 
|
 
|-
 
|-
−
|Ryan Pierce
+
|Riley Pierce
−
|Danger Committee
+
|Danger Committee/Manager/Trainer/BAMF
 
|
 
|
 
|-
 
|-
 
|Carl Karsten
 
|Carl Karsten
−
|Ryan Pierce
+
|Riley Pierce
 
|11/9/22
 
|11/9/22
 +
|-
 +
|Ron Olson
 +
|Riley Pierce
 +
|11/16/22
 +
|-
 +
|Dan Wells
 +
|Riley Pierce
 +
|11/16/22
 +
|-
 +
|James Lamken
 +
|Riley Pierce
 +
|11/16/22
 +
|-
 +
|Claire Fiorino
 +
|Theo Tetzlaff
 +
|11/20/22
 +
|-
 +
|Ian Sampson
 +
|Theo Tetzlaff
 +
|11/20/22
 +
|-
 +
|Joseph Staffa
 +
|Riley Pierce
 +
|12/14/22
 +
|-
 +
|Andrew Wingate
 +
|Riley Pierce
 +
|1/3/23
 +
|-
 +
|Elizabeth Koprucki
 +
|Riley Pierce
 +
|1/4/23
 +
|-
 +
|William Shehan
 +
|Riley Pierce
 +
|1/5/23
 +
|-
 +
|Laura Sparks
 +
|Riley Pierce
 +
|1/5/23
 +
|-
 +
|Patrick Mahon
 +
|Theo Tetzlaff
 +
|1/18/23
 +
|-
 +
|Ryan Mata
 +
|Riley Pierce
 +
|2/8/23
 +
|-
 +
|Dan Walsh
 +
|Riley Pierce
 +
|3/1/23
 +
|-
 +
|Ryan Helsing
 +
|Riley Pierce
 +
|3/29/23
 +
|-
 +
|David Earl
 +
|Theo Tetzlaff
 +
Riley Pierce (refresher 9/8/23)
 +
|4/16/23
 +
|-
 +
|Jordan Kessel
 +
|Theo Tetzlaff
 +
|4/16/23
 +
|-
 +
|Aaron VerDow
 +
|Theo Tetzlaff
 +
|4/16/23
 +
|-
 +
|Jonathan Bisson
 +
|Theo Tetzlaff
 +
|5/3/23
 +
|-
 +
|Lucas Alvarez
 +
|Theo Tetzlaff
 +
|5/3/23
 +
|-
 +
|Bryan Sills
 +
|Theo Tetzlaff
 +
|5/3/23
 +
|-
 +
|Adam Stafford
 +
|Riley Pierce
 +
|5/17/23
 +
|-
 +
|James Nowell
 +
|Riley Pierce
 +
|6/7/23
 +
|-
 +
|Paulina Hubli
 +
|Riley  Pierce
 +
|7/1/23
 +
|-
 +
|David Henderson
 +
|Riley Pierce
 +
|7/23/23
 +
|-
 +
|Jim Leonardson
 +
|Riley Pierce
 +
|9/13/23
 +
|-
 +
|Elizabeth Braun
 +
|Riley Pierce
 +
|9/13/23
 +
|-
 +
|Matthew Gaffney
 +
|Riley Pierce
 +
|9/13/23
 +
|-
 +
|Tam Ragatz
 +
|Riley Pierce
 +
|9/13/23
 +
|-
 +
|Stephen Metzel
 +
|Riley Pierce
 +
|9/27/23
 +
|-
 +
|Scott Yoder
 +
|Riley Pierce
 +
|9/27/23
 +
|-
 +
|Paul Johnson
 +
|Riley Pierce
 +
|11/13/23
 +
|-
 +
|John Jegerski
 +
|Riley Pierce
 +
|11/13/23
 +
|-
 +
|Nathan Dietz
 +
|Riley Pierce
 +
|11/13/23
 +
|-
 +
|Dan Tan
 +
|Riley Pierce
 +
|11/13/23
 +
|-
 +
|Burton Kent
 +
|Riley Pierce
 +
|12/9/23
 +
|-
 +
|Brent Myers
 +
|Riley Pierce
 +
|1/10/24
 +
|-
 +
|Molly Williford
 +
|Riley Pierce
 +
|1/10/24
 +
|-
 +
|Thomas Repasky
 +
|Riley Pierce
 +
|1/10/24
 +
|-
 +
|Saad Ali
 +
|Riley Pierce
 +
|1/10/24
 +
|-
 +
|Cris Sievenpiper
 +
|Riley Pierce
 +
|1/10/24
 
|-
 
|-
 
|}
 
|}
    
== Green Coffee Bean Suppliers ==
 
== Green Coffee Bean Suppliers ==
−
* [https://javamaster.com/collections/coffee JavaMaster] - Sells in 3.5, 10, and 40 lbs quantities
+
* [https://javamaster.com/collections/coffee JavaMaster] - Sells in 3.5, 10, and 40 lbs quantities.
−
* [https://www.sweetmarias.com/ Sweet Maria’s] - Sells in 1, 2, 5, 10, and 20 lbs quantities
+
* [https://www.sweetmarias.com/ Sweet Maria’s] - Sells in 1, 2, 5, 10, and 20 lbs quantities.
−
* [https://www.coffeeshrub.com/ Coffee Shrub] - Larger volume sister company to Sweet Maria’s
+
* [https://www.coffeeshrub.com/ Coffee Shrub] - Larger volume sister company to Sweet Maria’s.
−
* [https://deansbeans.com/collections/green-unroasted-coffee-beans Dean’s Beans] - Some good selections available
+
* [https://www.isabella.coffee/ Isabella Imports] - Sells in 1 lb increments. A Galena, IL based company that has some interesting selections.
 +
* [https://deansbeans.com/collections/green-unroasted-coffee-beans Dean’s Beans] - Some good selections available.
 
* [https://www.Amazon.com/ Amazon, gourmet foods section] - yes… Amazon.
 
* [https://www.Amazon.com/ Amazon, gourmet foods section] - yes… Amazon.
−
* Coffee & Tea Exchange in Chicago on Broadway — they have green beans and will sell if you ask nicely.
+
* [https://coffeeandtea.com/ 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''
 
''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 ==
 
== Maintenance ==
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|-
 
|-
 
|Clean two exhaust thermocouples
 
|Clean two exhaust thermocouples
−
|10/26/23
+
|12/30/23
−
|Ryan
+
|Ron and Riley
 +
|
 +
|-
 +
|
 +
|07/23/23
 +
|Riley and David Henderson
 +
|
 +
|-
 +
|
 +
|05/27/23
 +
|Riley
 +
|
 +
|-
 +
|
 +
|10/26/22
 +
|Ron and Riley
 
|
 
|
 
|-
 
|-
 
|Clean glass chamber
 
|Clean glass chamber
 +
|12/30/23
 +
|Ron and Riley
 +
|
 +
|-
 +
|
 +
|07/23/23
 +
|Riley and David Henderson
 +
|
 +
|-
 +
|
 +
|02/20/23
 +
|Theo
 +
|
 +
|-
 +
|
 +
|12/21/22
 +
|Riley
 +
|
 +
|-
 +
|
 
|10/24/22
 
|10/24/22
−
|Theo and Ryan
+
|Theo and Riley
 
|Spot cleaning only
 
|Spot cleaning only
 
|-
 
|-
 
|Clean upper duct
 
|Clean upper duct
 +
|12/21/22
 +
|Riley
 +
|Spot cleaning only
 +
|-
 +
|
 
|10/24/22
 
|10/24/22
−
|Theo and Ryan
+
|Theo and Riley
 
|Spot cleaning only
 
|Spot cleaning only
 
|-
 
|-
 
|Vacuum clean air intake filter
 
|Vacuum clean air intake filter
 
|10/26/22
 
|10/26/22
−
|Ryan
+
|Riley
 
|
 
|
 
|-
 
|-
 
|Clean lower dump valve
 
|Clean lower dump valve
 +
|12/21/22
 +
|Riley
 +
|Spot cleaning only
 +
|-
 +
|
 
|10/24/22
 
|10/24/22
−
|Theo and Ryan
+
|Theo and Riley
 
|Spot cleaning only
 
|Spot cleaning only
 +
|-
 +
|Replace upper chamber gasket
 +
|12/21/22
 +
|Riley
 +
|
 
|-
 
|-
 
|Clean hot air thermocouple
 
|Clean hot air thermocouple
 
|10/26/22
 
|10/26/22
−
|Ryan
+
|Riley
 
|
 
|
 
|-
 
|-
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== Technical Details ==
 
== 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. Moving this back to 208 V will require re-adjustment of this trim pot.
+
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.
 +
 
 +
[[Category:Loaned Equipment]]
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