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:	Fri Mar 28 20:48:40 2025
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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 > > --- > > 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. > > --- > > 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. > > --- > > 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. > > --- > > 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. > > --- > > 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. Encoding: HTML ELCode plain Suppress Email notification

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