HELiOS Portables Technical Service Manual • PN 20562190 Rev E
51
HELiOS P
or
tables
Troubleshooting & Repair Procedures
XI
( )
w2-w1
# hours
24
= NER
RP22 – Normal Evaporation Rate (NER) Test
1) Ensure the unit has been leak tested (RP2).
2) Fill the H300 or H850 from a properly saturated source of
liquid oxygen.
3) Allow the unit to sit undisturbed for 1-2 hours to allow it to
stabilize at its PRV pressure.
4) Record the initial weight (w1) of the unit and the time this
weight was measured.
5) Allow the unit to sit undisturbed for 5-6 hours.
6) Record the final weight (w2) of the unit and the time this
weight was measured.
7) Calculate the NER (the weight of contents that evaporates
per day) using the formula below:
8) Verify that the NER is within the specifications listed in
Table 4.
RP23 – Oxygen Supply Line Quick Connect R/R
1. Remove the case (RP4).
2. Use a small flat head screwdriver to carefully pry the
urethane tube from the inlet barbed fitting of the inline
check valve.
3. Use a 5/8 inch open end wrench to remove the nut that
secures the quick connect to the front cover.
4. Pull the quick connect down and out of its mounting hole.
5. Remove the urethane tube from the barb on the quick
connect.
6. Install the new quick connect by reversing steps 1-5.
RP24 – Inline Check Valve R/R
1. Remove the case (RP4).
2. Use a small flat head screwdriver to carefully pry the
urethane tube from the inlet barbed fitting of the inline
check valve.
3. Use a small flat head screwdriver to carefully pry the
urethane tube from the outlet barbed fitting on the inline
check valve.
4. Install the new inline check valve by reversing steps 1-3.
