Heath Consultants Hi Flow Sampler - Manual (Page 46)

Maintenance Hi Flow

Sampler
46 Instruction 0055-9017
4.4 Replacing the Internal Filters
Three internal filters protect the instrument from being contaminated by dust and dirt.
Replace these filters when they look contaminated. A good indication that a filter needs
replaced is when the instrument’s gas-response time increases.
4.4.1 Leak-Gas Filter
The leak-gas filter is located between the sampling port on the flow-measurement tube
and its associated solenoid valve on the printed circuit board. See Figure 4-3.
Equipment Required:
• Medium Phillips Head Screwdriver
• Replacement Filter (P/N 07-1563)
Procedure:
1. Remove the cover per Section 4.3.
2. Remove tubing from old filter’s inlet and outlet.
3. Install tubing on new filter, making sure that the filter’s flow arrow points away
from the flow-measurement tube.
4. Replace the cover that was removed in Step 1.
Figure 4-3. Leak-Gas Filter