ELOG CARME

AIDA GELINA BRIKEN nToF CRIB ISOLDE CIRCE nTOFCapture DESPEC DTAS EDI_PSA 179Ta CARME StellarModelling DCF K40

CARME

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Entry time:

Wed Sep 30 08:10:36 2020

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(NOTE: Raspberry Pi internal clock appears to be on GMT, rather than GMT+1 due to daylight saving.)

Baking started on Mon 28 Sep. Due to WiFi connection authorisation expiring, no remote access was possible until
Tue 28 afternoon.

JM found remotely that temperature had increase up to 80 C, and baking had then been shut off due to negative
gradients. Unclear what happened. System was already cooling.

Restarted baking in automatic mode. Baking shut down automatically after few hours. It is likely the automatic
mode was being confused by vessel cooling and being heated at the same time.

29 SEP

20:30 Switched to manual mode (60 C). Left overnight

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30 SEPTEMBER

08:10 Temperatures seem stable, but slight temperature gradient across vessel would prevent automatic mode from
working. See attached.
Unclear why RE72-1 let temperature reach 64 C when setpoint is 60 C. May be affected by RE72-2. Not worrying,
but may confuse automatic mode.
Ramped up to 70 C manually.

11:10 Temperatures stable. Ramped to 80 C manually. Gradient in CARME vessel unchanged at ~11 C. See attached.

14:18 Found baking had stopped shortly after last check. One floating thermocouple reported temperatures above 300 C. 
Unclear what happened. Possible fault? See attached. 
Restarted baking manually at 40 C. Waiting for temperature to stablise. Vessel still cooling - cannot activate
automatic mode.

15:00 Temperatures OK. Ramped manually to 50C

18:10 Temperatures stable. Ramped manually to 60 C. Left automatic mode on

20:20 Found temperature setpoint at 66 C. See attached.
Huge spikes in thermocouple 1-4 Floating (side-low). Same thermocouple that reported temperature spikes earlier. May be
faulty or touching heater directly. Seems to happen for T=65 C and above.
Set to manual mode. Temperature setpoint 60 C. Left overnight.
Will ask local people to remove thermocouple 4 from picologger 1 (aka #A0067/395, port 4) to continue.

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1 OCTOBER

08:00 Temperatures stable. Interesting behaviour of problematic thermocouple 1-4. Trend looks real. Seems to confirm
hypothesis it is touching a heater.
Waiting for DL locals to disconnect it.

09:49 Thermocouple 1-4 disconnected. Increased temperature manually to 75 C / 70 C. 
It appears RE72-1 consistently reports 5C above its set point. It controls 3 heaters vs. 8 heaters controlled by RE72-2. 
This is most likely due to RE72-2 needing greater power output to reach its setpoint, increasing RE72-1 thermocouple
temperature as a result. 
RE72-2 may be doing very little at the moment.
Hopefully placing its setpoint 5 C above will force both heaters to work together. This may decrease temperature
gradients observed in the vessel.

16:20 Increased temperature manually in steps up to 95 / 80 C.
The uneven temperature setpoints associated with the two RE72 appears to have reduced the temperature gradient in the vessel.
Will ramp up to 100 later this evening and leave overnight.
See attached.

22:00 Temperature stable. Rates are showing unphysical rates (too high / too low) and occasionally going all to zero at the
same time. 
Looks like a previously observed bug that I thought had been sorted. Will have to debug again. Does not affect manual mode.
Ramped temperature to 105 / 95 C. Leaving overnight.
See attached.

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2 OCTOBER

07:58 Temperatures stable. See attached. Slight gradient in CARME vessel (~11 C). Not worrying.
Ramped manually to 115 / 105 C

12:16 Temperatures stable. See attached. Valve temperature at 46 C.
Ramped manually to 125 / 115 C

17:34 Temperatures stable. See attached. We seem to be getting close to the upper limit of what the tent can achieve.
Ramped manually to 135 / 125 C
Will leave overnight.

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3 OCTOBER

08:32 We have been baking at full power (heaters always on). Temperatures stable. 
Appears to be as high as we can go with this tent configuration.
Will leave in manual mode and monitor throughout the day.
See attached.

17:00 Temperatures stable. No changes from this morning.

21:00 Temperatures stable. See attached. Baking continues overnight.

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4 OCTOBER

07:30 Found temperatures decreased overnight by around 10 C. See attached. 
We are still baking at full power. Room temperature has not changed.
Most likely explanation is part of the tent giving / moving due to the baking and a draft being developed.
Will keep monitoring during the day.

13:50 Temperatures stable, no changes from last check.

20:22 Temperatures stable. See attached. Leaving overnight.

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