1. “Update on Software Development for the Thermal Tests”
Ioannis Kossyvakis
Computer Engineering & Informatics Department
University of Patras
Greece
12/12/2011

2. Contents Calibration of temperature sensors Tests at Test Module
Requirements
Equipment for the test measurements
LabVIEW sub-program
Tests at Test Module
Cooling scheme for Test Module 0
Control Scheme
Summary Table
Future Tasks

3. Calibration of temperature sensors
Part 1:
Calibration of temperature sensors

4. Requirements
a) Acquire values (Ohm) from the temperature sensors (PT100’s for resistance measurement) with reference to temperature from the reference thermometer.
b) Based on these values – generation of polynomial coefficients for each PT100 using: f(x) = anxn + an-1xn-1+…+ a2x2 + a1x + a0 (Lagrange aproximation)
c) Save polynomials to a database in order to be used in final tests for PT100 data
re-calculations.

5. Equipment for the tests measurements
-NI DAQ ( 8 slots )
-NI 9217 (Up to 4 channels for analog input)
Temperature sensor
Reference thermometer

6. LabVIEW subprogram (1 of 2)

7. LabVIEW subprogram (2 of 2)
f(x) = a3x3 + a2x2 + a1x + a0

8. Part 2:
Tests at Test Module

9. Requirements a) Control of the heaters.
b) Using the calibration coefficients for polynomials for each PT100 (f(x) = anxn + an-1xn-1+…+ a2x2 + a1x + a0), we can precisely obtain temperatures at needed points of test module during long time tests with heating. All measurements will be logged in result files.
c) Management of the control valves (CV1…CV6) according to the temperature sensors (PID algorithm).
d) Possibility for manual valves control.

10. Cooling Scheme for Test Module 0

11. Data will be logged in result files.
Control Scheme
NI 9217
CDAQ (8 slots)
Temperature from calibrated PT 100
TS SENSORS
TS7, TS10, TS13, TS16, TS22, TS28
CDAQ (4 slots)
NI 9265
PID
CV1…CV6
Data will be logged in result files.
Manual
CV7
PWM
NI 9201
NI 9472
Solid state relay of heaters 1 & 2
HEATERS FT

12. LabVIEW subprogram (1 of 2)

13. LabVIEW subprogram (2 of 2)

14. Summary Table Name Total Comments Picture 29 7 - 1 6 8 2
Temperature Sensors (TS) 29
PT 100  4 - wire resistance measurements
Control Valves (CV) 7 -
Pressure Regulating Valve (PRV) 1
Fluid Transducer
(FT)
Hand Valves (HV) 6
Safety Valves (SV) 8
Heaters (HT) 2
Heater control – solid state relay based

15. Part 3: Future Tasks
Perform test measurements of the LabVIEW sub-program for the thermal tests.
Possible modifications to the current LabVIEW sub-programs.