LTV 1150 - Page 330

Page E-14 LTV
®
1200/1150 Ventilator Service Manual p/n 18603-001, Rev. C
If the instrument accuracy is 2% of reading, at 30% the resulting accuracy is 30% x 2% =
0.6%. The resulting accuracy is less than the minimum accuracy level (0.75%) and is
acceptable.
If the instrument accuracy is 2% of full scale and the instrument has a full scale of 100%, the
resulting accuracy is 100% x 2% = 2%.
Under these conditions, reduce the tolerance from ± 3% by the accuracy of the
instrument (2%) for a “guard-banded” tolerance of 30% ± 1% = 29% to 31%.
60%
When measuring oxygen blending of 60% with a tolerance of ± 5%, the resulting minimum
accuracy level for instrumentation would be 5% / 4 = 1.25%.
If the instrument accuracy is 2% of reading, at 60% the resulting accuracy is 60% x 2% =
1.2%. The resulting accuracy is less than the minimum accuracy level (1.25%) and is
acceptable.
If the instrument accuracy is 2% of full scale and the instrument has a full scale of 100%, the
resulting accuracy is 100% x 2% = 2%.
Under these conditions, reduce the tolerance from ± 5% by the accuracy of the
instrument (2%) for a “guard-banded” tolerance of 60% ± 3% = 57% to 63%.
90%
When measuring oxygen blending of 90% with a tolerance of ± 5%, the resulting minimum
accuracy level for instrumentation would be 5% / 4 = 1.25%.
If the instrument accuracy is 2% of reading, at 90% the resulting accuracy is 90% x 2% =
1.8%.
Under these conditions, reduce the tolerance from ± 5% by the accuracy of the
instrument (2%) for a “guard-banded” tolerance of 90% ± 3% = 87% to 93%.
Oxygen percentage measurement instrumentation and test equipment
Recommended instrumentation and test equipment for oxygen percentage measurements is
paramagnetic based oxygen measurement devices.
From the LTV
®
1200 or the LTV
®
1150 Ventilator Operator’s Manual, regarding LTV
®
inspired oxygen (FIO
2
) concentrations while ventilating a patient:
WARNING
Inspired oxygen (FIO
2
) concentration – If exact concentrations of inspired oxygen are
required to be delivered to the patient, it is recommended that an accurate oxygen analyzer
with alarms be used.