Ullage Monitor

1
Ullage Monitor

• Joe A. King
• Bart Oegema
• Matt Jeffryes
• Jim Castelaz
• Red Mountain Embedded Systems

2
Agenda

• Motivation
• Challenge
• Product
• Performance
• Specs
• Next steps
• Future Developments

3
Motivation

• Bottle filled ½ full of Halon
• Bottle fill pressure 360 psig
• Includes 160 psig nitrogen supercharge
• Plus 200 psig Halon vapor pressure at 70F
• TCPS switch is set for 280-320 psig
• 75 of liquid Halon can leak out before alarm
  sounds

4
Challenge
Halon vapor
Nitrogen gas
Dissolved Nitrogen
Liquid Halon
Temperature changes everything Vapor pressure
of Halon Density of Halon liquid Density of
Halon gas Relative amounts of Halon gas and
liquid Amount of dissolved Nitrogen
gas Pressure of Nitrogen in Ullage
5
Product Demo
6
Product Performance
7
Current Specs

• Pressure resolution 1 psi
• Pressure accuracy 1 psi
• Ullage resolution Better than 1 at
  equilibrium
• Recommended ullage alarm level 10
• Supply voltage 9 to 28 volts dc
• Current draw 30 mA
• Temperature Range -40 to 125C components
• Max operating pressure 500 psig
• Environmental capability Designed for DO160
• Housing Brass or SS
• Mechanical connection 3/8-NPT
• Weight Less than 4 oz
• Output Reed relay interface Field test
  switch included
• Low-pressure indicator standard