TempGUI

GUI for temperature and humidity monitoring in LAr purifier (for Temperature logger and EZO Atlas sensors)

Updated on 7/18/24: Use the GUIfinal.py with TabWindow.py

Updated on 7/22/24: Converting gauge pressure to absolute pressure, Configure default unit to be psi and plot the conversion to Torr, calibrate the low point psi

Required Packages

already installed, if error messages pop up, pip install again

pip install pyqt5
pip install pyqtgraph
pip install pyserial

Sensors connection setup:

• For Atlas sensors (Humidity, Pressure)
• For thermocouples, make sure the setting is on K-type thermocouples and all channels (T1-T8 are connected correctly as labelled)

Instruction to run GUI on the PC:

1. Click on the taskbar 'Search'
2. Open Anaconda Navigator
3. Open Jupyter notebook from Anaconda Navigator
4. Open powershell from Anaconda Navigator
5. Type in the command to get into the directory where the python code is

cd .\Desktop\TempGUI\GUIfinal\

6. Run the python code for GUI

python .\GUIfinal.py

Connecting Serial Communications and Logging data

1. Press 'Refresh port' to get most recent port names in the drop down box

2. Choose Baudrate (default for Temp = 38400, Hum = 9600, Pressure = 9600)

3. Choose logging interval (default is 2 seconds, minimum is 1 second (Atlas sensors transmit readings every 1 second))

4. Press 'Start/Stop' to start plotting Data is not recorded yet, this is just to initialize the serial communication and let it run for a few seconds before we start logging data (first few readings for atlas sensors are *OK which are just confirming the status, setup, etc.

To start logging data:

5. Choose 'File Directory' for both Temp, Hum, and Pressure Make sure save directory are set for all three!

6. Press 'Log All' to start logging data as csv files

To ensure the data is being recorded properly, both logging and start/stop button must be green as shown in screenshot below

Additional Information for debugging

Atlas EZO sensors

connections from sensor → Board

White: RX → TX-O

Green: TX → RX-I

Black: GND → GND

Red: VCC → 3.3V

Blue: Auto → N/C

1. Pressure Logger

EZO-PRS™ Embedded Pressure Sensor

psi (0 – 74.000) Default, atm (0 – 5.03), bar (0 – 5.102), kPa (0 – 510.212)

Only read gauge pressure (relative to atmospheric pressure)

Conversion: $P_{abs} = P_{gauge} + P_{atm}$

$P_{atm}$ = 14.969 psi = 1 atm = 1.01325 bar = 101.325 kPa

conversion to bar then to Torr

Line 224: Pressure_bar = float(Pressure_psi)*0.06894757 #convert psi to bar
Line 225: self.latest_reading = (Pressure_bar+self.ATM_P_bar)*750.061683 #convert to Torr

Showing pressure in 3 units. plot in Torr:

• Writing commands: self.ser.write(b'[command]\r\n')

• Commands:

  • check unit: U,?
  • set unit: U,psi U,atm U,bar U,kPa
  • Low point calibration in psi: Cal,0 (before cal: reads 855 Torr at atm, after cal: reads 760 Torr at atm) 7/23/24 edit: reset calibration (use the Hornet gauge as ref which reads 871 Torr)
  • Restore calibration to factory setting: Cal,clear

2. Humidity Logger

EZO-PRS™ Embedded Humidity Probe

0 – 100% RH

• Commands:
  • Enable All 3 readings:
    • O,HUM,1
    • O,T,1
    • O,Dew,1
  • Check of all readings are enabled: O,? --> ?,O,HUM,T,Dew of all anabled

3. Temperature Logger

8 Channel Handheld Thermocouple Thermometer/Data Logger

notes on connection

Power on the device before plugging in otherwise serial port won't be recognized.

hexadecimal decoding

Output: 37 Hex bits for 8 channels Max temp is 1800, use this to determine when the temperature decoding needed to be swithed to using Two's complement

Read: 01 16 7b 28 48 4c 45 48 54 43 34 30 39 35 68 71 e3 00 2b 01 00 00 00 00 00 00 00 00 00 00 00 00 c6 29 7d 7e 04

where the first 16 bits and last 4 bits are the same in all T readings, the middle 16 bits represents temperature readings for the 8 channels (2 bits or 4 digits per channel), Temperature is recorded in 4 digits Hexadecimal number read backward (Little endian system: stores the least-significant byte at the smallest address) For example, the conversion between the reading in channel T2 would be, 2b 01 --> 012b --> 299 --> 29.9 degrees Celsius

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Water vapor concentration

RH to AH

Absolute Humidity is calcualted using the measured Relative Humidity and Temperature from the EZO-Hum sensor, using the formula: $AH = 2.16 \cdot \frac{RH\cdot6.11 e^{\left ( \frac{17.27 \cdot T}{T+273.15-35.86} \right )}}{T+273.15}$

when RH is Relative Humidity in % and T is Temperature in degree Celsius

AH to ppm

... *I haven't figured out the conversion yet, but to retrieve the AH, temperature, and Pressure value you can obtain data from model (humidity and pressure data are stored in separated models)

HUM_time, RH_val,TMP_val,AH_val,DEW_val = self.humidity_model.getData()
Press_time, Press_raw, Press_torr = self.pressure_model.getData()

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Code structure

There are 3 worker threads:

• Temperature (T1-T8 thermocouples): write commands, read and emits time and 8 temperatures in tuples
  • logs time, T1-T8 temperature in degrees celsius
• Humidity (RH, Output Temperature, Dew point): emit time and 4 values where Absolute humidity is calculated from RH and Temperature
• Pressure (pressure): emit time and pressure value in psi (raw reading) and torr (calculated)

There are 3 models to store, handle corresponding data emitted

Worker threads handle serial communications, emits data to connected pyqtSlot through self.worker.result.connect(self.updatefunction)

The update function store data in the model and plots them out and logs (appends) to .csv file