107
5.2.3 Replacement of Hypoxic Guard Block (FR135025)
1. Remove the front cover.
2. Remove the fl ow tubes (Figure 56).
3. Remove the 2 screws from each
side.
4. Take care to support the bottom of
the fl ow meter assembly and gently
pull the bottom edge out and then
down to gain access to the gas
supply pipes and backlight power
supply cable.
Figure 57 - Removal of Screws on
Flow Meter Assembly
Figure 58 - Rear of Flow Meter Assembly
If only Simplex Gas tubes are fi tted, the pipes running from
the top to the bottom will not be fi tted.
Gas Output
Air Supply
N2O Supply
O
2
Supply
Backlight Power Supply
Detailed Repair Procedures