Theory of operation
Puritan Bennett™ 700 Series Ventilator System Service Manual
10070389 Rev. A
2-53
Figure 2-39. EPROM
EPROMs
7-00144
Table 2-2: NVRAM contents
Type of data
Parameter
Notes
Service data
Ventilator serial number
Service data
Total number of breaths
Updated every 100 breaths.
Service data
Hours of operation (excluding standby
mode, SST, EST, calibration, and service
menu operation)
Service data
Number of times high-flow and low-flow
oxygen solenoids have been cycled
Service data
Estimated oxygen sensor life remaining,
in hours
Based on current O
2
% setting. The
greater the percentage oxygen in use,
the lower the life.
Service data
Hours internal battery has powered
ventilator
Service data
Hours remaining until preventive
maintenance is due
Service data
Number of times autozero solenoids have
been turned on
Total number of on times for the
exhalation pressure transducer autozero
solenoid and cylinder pressure transducer
autozero solenoid.
Service data
Current time, in number of seconds since
1/1/96
Updated every hour.
Calibration and other
constants
Exhalation flow sensor resistance
constant
Must be input when new exhalation flow
sensor installed.
Calibration and other
constants
Cylinder leak constant lookup table
Must be input when new piston/cylinder
installed. Cross-checked during EST.
Summary of Contents for Puritan Bennett 700 Series
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