Thermo Scientific 10519, Instruction Manual

Page: 33 / 44

Chapter 5 Preventative Maintenance
5-3
PRECISION ORIFICE CHECK
The precision orifice allows a certain amount of flow for the zero and span gas to the
dilution probe. The flow must be enough for the critical orifice to draw from while
providing a reasonable lag time through the sample line.
SPAN SOLENOID VALVE CHECK
The valves can be checked by using air flow applied to the common port of the valve. Use
the plumbing diagram associated with the type of controller supplied with the instrument.
Figure 5-1 shows the components of the span valve manifold assembly.
62P718
Figure 5-1 . Span Valve Manifold Assembly