LN2-Monitor 0.0.10

A Project that helps automate the weighing of LN2

LN2_Monitor

This project will use a USB connection to a dymo scale to help graph and weigh the percentage full of an LN2 trap. The percentage full is based on the maximum weight a LN2 trap can hold(about 28.26kg). The scale used in conjunction with this code is the Dymo Digital Shipping Scale (S100) (https://www.dymo.com/scales/dymo-s100-digital-usb-shipping-scale-100-pound-capacity/SAP_1776111.html)

Required Software: download the software below first:

libusb-win32 (https://sourceforge.net/projects/libusb-win32/)

The easiest way to install it is to download the Zadig installer https://zadig.akeo.ie/

Select your device and select the libusb-win32 driver. Then click replace or install driver

to install the code: python3 -m pip install LN2_Monitor then go into python and input

from ln2_monitor import d1 
scale = d1.SCL()
scale.monitor()

or

scale.plot()

Both plot and monitor will generate text file logs in the current directory

**To turn off "auto-sleep" mode on the scale, hold the kg/lb button (sometimes tare button) and turn the scale on. **

The basic minimum and maximum weights(kg) are set to default as the dewar that comes with a bluefors cryostat. Scale.setweight() can be run to change the minumum and maximum weight of the cryostat.

Enjoy!