Principles & Protocols

Protocols - Wohlwend

Jump to Principles

Start up

Preparation

• Lower pressure on standard 22PSI liquid nitrogen tank down to ~10 PSI by attaching pressure lowering device to vent outlet on tank
• Attach carefully to WW, being particularly careful about connector on WW

• Open side panel of machine and note current shot number

Pressure lowering device	Full Setup	N2 gas pressure

System Start

• Turn machine on using large red switch on side
• Press yellow "System Dry Up" button. Run gas through for 30 minutes.
• Turn off "System Dry Up."
• Press green "On/Off" button
• Press green "Nitrogen" button
• Open liquid nitrogen tank
• Wait until red "Nitrogen Level" light goes out
• Press yellow "Drive in" button.
  • Yellow light will start flashing
  • "Piston Down" red lamp will go on

• • "Drive In" light will go out
• Press green "Auto" button.

Use

• Insert holder and safety pin
• Green "Jet Ready" lamp should light
• Press yellow "Jet Auto" button
• Wait for yellow "Jet Over" lamp
• Pull pin and remove sample

Measuring temperature and pressure (traces to check performance)

• How_to_record_temperature_and_pressure_traces_on_the_Wohlwend_HPF.docx: Recording pressure and temperature maintenance on WW HPF

Equipment needed

• EasyScope USB Oscilloscope box and software
• BNC to BNC cable
• positive and negative cables plugged in to BNC converter
• recording holder (for recording temperature)

Set up

Temperature

• Plug green cable from grey box on top of WW into recording holder
• Plug one end of black BNC cable into grep box, and other end into left position on EasyScope USB box
• Remember to connect grey box to power outlet
• Note: Green cable connector has a fine pin. Be careful to insert correctly and not to break the pin!
• cable:
  

Pressure

• Plug black and red cables into pressure ports on WW, and plug combined BNC output into middle position on EasyScope box

Images of setup

Computer

• Plug EasyScope box into USB port of "old" lab laptop
• Start EasyLogger software
• Set up channel A and B as shown in screencaps below

Screencaps for EasySCope settings:

* Setup for ww channel A:

* Setup for ww channel B:

Recording

• Set Channel B for trigger
• Set trigger level as shown in screencap below
• Put measuring holder (if recording temp) or actual holder (pressure only) in machine
• After firing shot, should get results close to those shown below
• May need to scroll screen sideways t be looking at appropriate time region

* Typical run on ww:

• Set ALLOWTOPICVIEW =

-- KdDerr - 03 Oct 2007

* easyscope1:

* easyscope2:

* ww setup:

* pressurelower:

* gaspressure: