Level Gauge
The Cryo-Cyl Series containers have preset operating pressures and preset
economizer regulators. These settings can be changed using the procedures
that follow.
When a container is dedicated to a liquid dispensing service, change the
operating pressure as follows.
1. Release pressure in the container by opening the vent valve.
2. The heat leak of the liquid cylinder will be enough to maintain the
pressure at 22 psig (1.5 BAR).
3. Replace standard pressure relief valve with one to maintain the desired
operation pressure (22 psig is normal). Use an oxygen compatible
liquid thread sealant (or Teflon tape) to prevent leaking.
4. Pressure test all new joints using an oxygen compatible leak test
solution.
The liquid level gauge in the Cryo-Cyl LP model is a float and spring that
approximates the amount of product in the container. The design of this
gauge makes it possible to use the same float and spring for nitrogen,
oxygen and argon. However, the liquid level decal must be changed for
each product. The decals are marked N for nitrogen, O for oxygen, and A
for argon.
6-4
180 liter LN2 Supply Tank
Thermo Scientific
Section 6
Service and Maintenance
Changing Operating
Pressure
Cryo-Cyl in Liquid Service
2
8
6
5
1
10
4
3
7
9
Figure H.
Gauge
Table 6-1.
Parts
ID #
Part No.
Qty.
Description
1)
29-1050-1
3
Stainless Steel Screw - 1/4'-20NC X 5/8"
2)
29-1060-1
3
Lockwasher – 1/4" Split Type S.S.
3)
54-1048-6
1
Sight Gauge Protector – Sight Glass (Yellow) (LP)
4)
38-3065-9
1
Sight Gauge Decal (Nitrogen)
5)
54-1108-6
1
Liquid Level Sight Gauge
6)
54-1059-1
1
Extension Spring
7)
23-0009-4
1
O-Ring (Silicone)
8)
10561266
1
Spring Retainer - 180 and 200 w/ Sight Glass
9)
29-5232-1
1
Set Screw
10)
54-1136-9
1
Float Rod Assy - Cryo-Cyl 180LP w/ Sight Glass
