Precision Medical HeliO2 Blenders - Manual (Page 24)

Heliox / Oxygen Blender Service Manual
Page 22
B. Blender Setup
1. Mount the Blender into a secured mating wall or pole bracket in an upright position.
2. Secure the Heliox and Oxygen hoses to the corresponding Blender inlets.
3. It is recommended that a condensation trap be installed in the Heliox supply line just before the
Blender Heliox inlet.
4. Attach a flowmeter capable of 0-120 lpm to the auxiliary outlet on the Blender.
5. Attach a t-fitting to the outlet of the flowmeter.
6. Attach an Oxygen Analyzer/Monitor to the one outlet on the t-fitting.
7. Attach a calibrated Heliox or Oxygen Flow Monitor capable of 0-120 lpm or greater to the other outlet
on the t-fitting.
8. The system is now ready for an initial performance test.
C. Initial Performance Test
NOTE: Before pressurizing make sure proportioning valve assembly is secure and screw is tightened.
1. Perform calibration on Oxygen Analyzer/Monitor per the manufacturer’s instructions prior to testing
the Blender.
2. Set Heliox & Oxygen pressures to 50 psi (3.45 bar) each.
NOTE: Turn OFF and check for leak by watching for pressure drops on pressure gauges.
3. An initial pressure drop may occur, no further drop in pressure should occur.
4. If continued pressure drop is observed, troubleshoot by using a commercial leak detector to find
source of leak and refer to Section 4: TROUBLESHOOTING for further instructions.
5. Use a lint free dry cloth to wipe Blender clean of commercial leak detector.
6. Ensure both inlet pressures are at 50 psi.
7. Replace the top cover.
NOTE: DO NOT install the (4) mounting screws until the end of the Final Test, or after satisfactory
completion of the Performance Check. Refer to the “OPERATING INSTRUCTIONS” in Users Manual.
8. Set flowmeter to 3-3.5 lpm.
9. Set the Blender to 60% F
IO
2
with Oxygen Analyzer/Monitor, this value should remain within 3.0% of
original reading throughout the following test.
a. Set flowmeter to 30-30.5 lpm, check concentration reading.
b. Set flowmeter back to 3-3.5 lpm.
c. Set Heliox inlet pressure to 50 psi (3.45 bar) and the Oxygen inlet pressure to 43 psi (2.96 bar)
adjust flow to 3-3.5 lpm, check concentration reading.
d. Set Heliox inlet pressure to 43 psi (2.96 bar) and the Oxygen inlet pressure to 50 psi (3.45 bar)
adjust flow to 3-3.5 lpm, check concentration reading.
e. If the Oxygen Analyzer/Monitor setting does not remain within 3.0% of the original reading, then
replace one or both of the diaphragm block assemblies.