1. ProtoDUNE SP – Slow control temperature readout setup test
Giovanna Lehmann – Xavier Pons
CERN 12/01/2017

2. CERN temperature readout test setup finished
National Instruments USB to PC DAQ device
PT100 Interface and current source generator box

3. LabVIEW data acquisition software from the USB National Instruments module

4. Up to 4 PT100 channels
PT100 signal to National Instruments module
4 wires connections to PT100
220 Vac or 115 Vac to ±15VDC power supply
PT100 current source circuit x 4
Calibrated to 1000 µA with FLUKE 87

5. Data is stored in *.txt excel file
Start Program
Data is stored in *.txt excel file
Temperatures. Units user defined
Temperature equation coefficient.
By default DIN IEC 60751
Choose PT100 or PT1000
Choose units Celsius or Kelvin scale
Excitation current source 1mA.
Each temperature point =
mean value of 200 samples
Readout frequency
By default 1000 msec
Stop program

6. PT100 connection
Blue I+
White V+
Red of White V-
Red of Blue I-

7. Setup repeatability results measuring always a fixed 50
Setup repeatability results measuring always a fixed 50.8 Ω resistor = ±15 mK
Can be improved with better NI module (awaiting delivery) mK mK

8. Question
Where should we send the setup first?
Another option is during the collaboration week we can do the test here at CERN, just we have find a dewar with some cold liquid. But also we’ll need few precise PT100 (from Lakeshore?)

10. Backup slides

11. Requirements
To measure one (maybe 2) temperature gradient monitor.
It means to measure 70 (maybe 140) temperature points per gradient monitor

12. Requirements
To measure one (maybe 2) temperature gradient monitor.
It means to measure 70 (maybe 140) temperature points per gradient monitor
- Hawai University plans to use PT-102 / PT-103 high platinum RTD temperature sensors from Lakeshore company.

13. - Temperature readout: Lakeshore temperature monitor type 218
One Lakeshore temperature monitor 2018 supports 8 RTD temperature
sensor readout.
Integration to SC possible via RS-232
For one temperature gradient (70 temperature sensors) 9 Lakeshore temperature monitor are required. (18 for 2 temperature gradient monitor)
9 (18) RS-232 ports required to integrate them in the SC.
- In addition to the temperature gradient monitor, in the overall detector there are many other temperature sensors, either PT100 either PT1000 to be integrated into the SC.

14. RTD PT100 and PT1000 temperature sensors readout system directly by SC.
Lakeshore sensor are conformance to IEC 751 / DIN (α = )

15. Lakeshore 218 temperature monitor is conformance to IEC 751 / DIN 43760 (α = 0.00385)
Lakeshore accuracy at 77 K ~ ±152 mK

16. IEC 751 / DIN (α = )

17. CERN proposes to create the own PT100 and PT1000 readout electronics for better accuracy and cost.
The proposal consist in creating a individual precise current source for each temperature sensor. Based in the Texas Instruments technical note:
This fixed and precise current source is used to excite the RTD PT100 and PT1000
The voltage sense of the sensor VM can be read by 16 channel NI9205 module
The readout accuracy is ±174 µV. I
At 73 K PT100 R =18.52 Ω with 1 mA current source the voltage VM=18.52 mV
If include accuracy ±174 µV → error range between mV and mv → Ω and Ω → ±0.4K

18. Using the 24 bits NI9238 cRIO module considering the ±0.07% error
At 73 K PT100 R =18.52 Ω with 1 mA current source the voltage VM=18.52 mV
If include accuracy ±0.07% → error range between mV and mv → Ω and Ω → ±0.03K