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Bulletin TI-H2PD-L1466
Control Circuit
Check Cell
High Temperature
High Pressure
Add Water
low Water
Figure 4 - Detailed Views
The internal circuitry of the VWR Hydrogen Generator controls the electrolytic cell current to a
safe level, eliminating the possibility of excessive hydrogen production.
If electrolyte solution should pass through the system into the hydrogen output stream, the
"Check Cell" message will be displayed and the outlet solenoid valve will close, preventing
damage to equipment installed downstream from the VWR Hydrogen Generator.
If the electrolytic cell exceeds its maximum temperature safety setpoint, the generator will
shut down until the cell cools. When the generator shuts down as a result of excessive cell
temperature, the "High Temperature" message will be displayed.
If the hydrogen supply line is over pressurized, the generator will shut down. When the
generator shuts down as a result of excessive pressure in the hydrogen supply line, the "High
Pressure" message will be displayed.
If the water supply in the feed water bottle reaches a preset refill level (3-1/2 day supply), the
"Add Water" message will be displayed and a slow, audible signal will sound. The system
remains operational. The signal will be reset when the water bottle is refilled above the "Add
Water" mark.
If the deionized water supply in the feed water bottle reaches the preset minimum level,
the "Low Water" message will be displayed, and the hydrogen generator will shut down. A
rapid, audible signal will sound when the minimum water condition occurs. The generator will
re-start and the audible signal will be reset as soon as deionized water is added and the water
level rises over the "Low Water" level mark. The VWR Hydrogen Generator will run for 8-10
days (depending on ambient temperature, flow demand, etc.) at maximum flow on a full water
bottle, before the "Add Water" message will be displayed.
Top View, Access Panel Open
Installation, Operation, and Maintenance
VWR Hydrogen Generators
Back View, Screen Removed
5
Bulletin TI-H2PD-L1466
VWR Model 89209-862
and 89209-864 Hydrogen
Generators
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