Welch Allyn Duet CO2 Module - User Manual - Manual (Page 13)

Duet CO
2
Module OEM Implementation Manual
Welch Allyn OEM Technologies Confidential Page 13
Hardware Components
Introduction
The OEM defines the resident Duet CO
2
Module hardware necessary for mainstream and/or
sidestream operation. Configurations may include mainstream and sidestream sampling (MS/SS Duet
CO
2
Module), mainstream sampling only (MS Duet CO
2
Module) or sidestream sampling only (SS Duet
CO
2
Module). Refer to 19 for drawings of these configurations.
An additional consideration is the inclusion of an isolated power supply. Mainstream operation requires
an isolated power supply to meet patient safety requirements.
NOTE The OEM must supply Patient isolation when using mainstream Duet and the mainstream
sensor.
The motherboard for all Duet CO
2
Module configurations is referred to as the CO
2
main processor
board. Mainstream and sidestream sampling requires the addition of the mainstream and/or sidestream
daughter boards with associated hardware to function.
CO
2
Main Processor Board
The CO
2
main processor board provides the interface to the mainstream and sidestream daughter
boards and the host system; manages power requirements; calculates measurements; and regulates
heater output and pump flow.
The functional components of the CO
2
main processor board include
§ 68HC11 microprocessor with external memory
§ reset circuit
§ primary power supplies
§ analog to digital (A/D) converter
§ digital to analog (D/A) converter
§ source hybrid
§ barometric pressure transducers