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Test for accuracy with varying inlet pressures.
Set the O
% to 60% with the inlet pressures at 50 psig (345 kPa).
2
Verify the setting accuracy comparing the setting with the analyzed value.
Set the O
pressure to 40 psig (276 kPa) leaving the air inlet at 60 psig (414 kPa).
2
Note the analyzer reading.
Set the O
pressure to 60 psig (414 kPa) and the air inlet to 40 psig (276 kPa)
2
Note the analyzer reading.
Analyzed O
concentrations shall vary by no more than 2% with the above pressure changes.
2
Test the alarm module function.
Set inlet pressures to 50 psig (344 kPa).
Set the O
% to 60%.
2
Reduce the air inlet pressure to 24 psig. (166 kPa).
The audible alarm shall sound within the following pressure range of 24-28 psig, and the O
Slowly increase the air inlet pressure to 50 psig (345 kPa). The alarm shall cease and reset prior to obtaining a inlet pressure of 40 psig.
(276 kPa).
Reduce the O
inlet pressure to 24 psig (165 kPa).
2
The audible alarm shall sound within the following pressure range of 24-28 psig, and the O
Slowly increase the O
(276 kPa)
Check the inlet filters.
To test the flow through the water trap filter and air inlet filter assemblies, a small test port has been provided on the rear of the
gas mixer just above the air inlet.
Turn both inlet gases off and allow the gases to cease flowing. With a ¼ inch hex nut driver, remove the plug from the test port and
install a 10-32 threaded nipple.
Connect an accurate pressure gauge (0-60 psig) (0-414 kPa) to the nipple.
Turn the inlet gases.
Set the gas mixer FiO
Observe the pressure registered by the gauge connected to the test port.
The difference between the test gauge pressure and the inlet pressure shall vary by no more than 5 psig (34 kPa).
If the pressure differential is > 5 psig (34 kPa), replace the inlet filters as outlined in the routine maintenance section.
ROUTINE MAINTENANCE
NOTE: The manufacturer will make available on request circuit diagrams, component part lists, descriptions, calibration instructions, or
other information that will assist trained service personnel to repair those parts of medical equipment that are designated by the
manufacturer as repairable by service personnel.
Routine maintenance of the gas mixer is limited to periodic performance verification, replacement of the inlet filters and cleaning of the
exterior surfaces. A gas mixer in need of calibration or service shall not be used until the necessary procedures are performed and the
equipment has been tested to determine that it is functioning properly. Calibration and servicing may only be accomplished by personnel
trained and authorized to do so by Sechrist Industries. Routine maintenance, as defined in this manual, may be performed by a competent
individual having experience in the maintenance of devices of this nature. Parts designated within this manual shall be replaced only with parts
manufactured or sold by Sechrist Industries.
Inlet filters
Periodically replace the air water trap/inlet filter (Sechrist P/N 3529E in Figure 4) at least every 6 months or as needed.
Replace the internal sintered stainless-steel filters (Sechrist P/N 3522K in Figure 3) at least every 6 months or as needed.
Cleaning
Exterior surfaces of the gas mixer may be wiped clean with a mild soap solution or a liquid disinfectant solution. Do not use
cleaning agents that contain abrasives.
inlet pressure to 50 psig (345 kPa). The alarm shall cease and reset prior to obtaining a inlet pressure of 40 psig
2
control to .21.
2
Page 11 • P/N 100001-EU Rev. 31 (10/2024)
analyzer shall read greater than 97%.
2
analyzer shall read less than 25%.
2
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