Repairing the Anesthetic Gas Module 9 Anesthetic Gas Module
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Infrared Measurement Assembly Head
Transferring NVRAM Data to a Replacement Head
When you replace an IR measurement head, you need to transfer its data to the replacement head. The
data is stored in non-volatile RAM (NVRAM) on the head and includes:
• System serial number
• Pump hours
• Flow rate limits
• User span constant for all channels
• User O
2
calibration values
• O
2
delay cycles
• IR source voltage
The NVRAM transfer board (NTB) reads data from the old head and transfers it to the replacement
head. The NTB is included with each replacement head.
Procedure for Transferring Data
1 Disconnect the Anesthetic Gas Module from the monitor.
2 Turn off power to the Anesthetic Gas Module.
3 Remove the Anesthetic Gas Module top cover and disconnect it from the Main PC board.
4 Connect the 40-pin cable of the NTB to the 40-pin connector of the new replacement IR
Measurement head.
5 Connect the 10-pin cable of the NTB to the top cover connector (J6) on the Main PC board.
6 Power up the Anesthetic Gas Module and observe the LED on the NTB.
7 For about the first 5 seconds the LED on the NTB will be amber. Whenever the LED is amber, the
NTB is processing information and you must stand by until the LED changes color again. During
these first 5 seconds, the NVRAMs of both the old and the new measurement heads are being read
and checked. If the LED changes to a solid green color, the NVRAM transfer process can begin.
Please skip to step 8 if the LED is green.
When either NVRAM cannot be read, it may take up to one minute before the LED changes color
and you will observe one of two error conditions:
– If the LED changes to a solid red color, a problem reading the old measurement head has
occurred. Turn off the power and check all connections. Make sure the ribbon cables are not
broken and correctly seated. Repeat the procedure staring with step 6.
If the LED is still on red, proceed with the installation of the new analyzer head regardless. The
NVRAM transfer will not be possible, but the replacement head has default information for
pump hours and no serial number. However, before installing the new measurement head, you
need to verify that the head is functional:
a. Replace the old measurement head with the new one.
b. Repeat the NVRAM transfer procedure from step 6.
If the LED blinks alternately red and green, the head is functional and you can continue with the
installation of the new head. If the LED is solid red, either the new head and/or the cable from
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