40m QIL Cryo_Lab CTN SUS_Lab TCS_Lab OMC_Lab CRIME_Lab FEA ENG_Labs OptContFac Mariner WBEEShop
  PSL  Not logged in ELOG logo
Message ID: 1744     Entry time: Tue Oct 11 19:38:54 2016
Author: awade 
Type: DailyProgress 
Category: TempCtrl 
Subject: Improving vacuum can insulation and reconnecting AD590 temperature monitors 

Rana thinks we can do better than 18 W heat load on the vacuum can. The insulation seems to have good cover all the way around but I want to see objectively where heat is leaking out.  

The vacuum can heaters have been hooked up to a 30 V ~0.5A supply (P=V^2/R=30^2/50=18W).  This will be left overnight so that the assembly can come up to temperature. I will have a look tomorrow with a thermal imaging camera to see if heat leakage points can be spotted.

---

The RTD 100 Ohm thermal sensor that was hooked up to the  966EN-4006 acromag card had been moved to monitor the air temperature within the tent.  The LIGO temperature sensor interface board (see chain of posts starting at PSL:1730) was reconnected to power, the pinouts are tabulated below.  One of the AD590 sensors (LEMO#6) was routed to the 8th input of the Acromag ADC a new channel was created in the data base (C3:PSL-VACTEMP_MON1) to monitor the vacuum can temperature.  I'm not entirely sure if Frank selected good metal film resistors for this circuit (see PSL:843), he was only using this for diagnostic monitoring.  Might need to switch to the J5 later as this one appears to at a calibrated value that makes sense when I tested it.

A frame builder would be good right now to log this data.

 

Pin outs of the DSub-9 connectors on the Temp sensor board:

Pinout Temp Sensor Board SubD-9 (#1)
Pin number Corresponding LEMO socket Voltage at 293K for AD590
1 GND  
2 GND  
3 GND  
4 GND  
5 NC  
6 J1 -8.54V
7 J2 -8.54V
8 J3 -8.54V
9 J4 -8.54V

 

Pinout Temp Sensor Board SubD-9 (#2)
Pin number Corresponding LEMO socket Voltage at 293K for AD590
1 GND  
2 GND  
3 GND  
4 GND  
5 NC  
6 J5 2.93V
7 J6 2.93V
8 ? or NC  
9 Fixed voltage -10.82V
 
ELOG V3.1.3-