Welch Allyn Duet CO2 Module - User Manual - Manual (Page 24)

Duet CO
2
Module OEM Implementation Manual
Page 24 Confidential Welch Allyn OEM Technologies
Mainstream Sensor
Description Specification
Dimensions 0.75 in L
× 1.35 in W × 1.00 in H
(19.5 mm L
× 34.29 mm W × 25.4 mm H)
Weight < 1.25 oz (18.5 gm) without cable
Cable Length 10 ft / +1.0 in / -4.0 in
(3.5 m / +2.5 cm / -10.2 cm)
Volume approximately 1.0 in
3
(16.59 cm
3
)
The mainstream sensor warm up has three phases: preliminary warm up, sensor start up and final
warm up. The preliminary warm up phase is the primary warming period. Once the sensor reaches the
near final temperature of 42
o
C, the sensor progresses to the sensor start up phase. Once start-up
conditions are met, the mainstream sensor returns to complete the warm up phase.
Phase/Task Elapsed Time (typical) Response Suggested Message
Preliminary/
Warm sensor 45 - 90 seconds <S0310> Sensor Warming
Sensor start up/
Start sensor motor 5 - 10 seconds <S0311> Sensor Warming
Final warm up/
Turn on IR source and
wait for signal 10 seconds <S0311> Sensor Warming
The warm up time of the mainstream sensor is dependent on the ambient temperature and the power
available to the heater circuit.
Note : If less power is supplied, the Duet CO
2
Module may be configured for a longer warm up time.
The following table lists typical approximate warm up times based on these variables in minutes.
Temperature 2.5 W a 3.5 W 4.5 W 5.5 W
5
o
C 9:50 5:00 3:00 2:20
25
o
C 3:00 1:40 1:00 0:40
40 o C 0:50 0:20 0:15 0:15
a. Power delivered to the sensor. For example, to supply 2.5 W to the sensor, the CO
2
main processor
board needs 3.5 W.
After operating temperature is reached, the bench motor is started and the signal acquisition begins to
servo the bench signal into the operating range. This may add 20 to 30 seconds to the warm up time.