Spacelabs 91518, Руководство по обслуживанию

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91518 Multigas Analyzer Service Manual 4-19
Maintenance
8 Watch the CO
2
waveform line and all numeric values. When everything appears to be stable and the agent
is identified as DES, verify that the gas readings are as follows:
* Although the gas bottle contains 46.5% O
2
, the 91518 reads O
2
in whole number percentages.
9 If the displayed values of FiO
2
do not fall within the range listed above after the completion of the gas
calibration, return to step 3.
10 If the display values of N
2
O, DES, and CO
2
do not fall within the ranges listed above, recalibration is
required. Touch CAL GAS. Recheck to ensure that the gas flow rate is correct and stable, then touch YES.
Wait for the span operation to complete. If the span is successful, the numeric values will reappear.
11 Verify that the gas values displayed are within the ranges provided in Table 1 . If they are not correct, verify
that the excess gas flow rate is still within 20 to 50 ml/min. If the flow rate has diminished below the required
20 to 50 ml/min and the regulator valve is fully opened, replace the gas bottle, re-establish proper gas flow,
and read the values again. If the values are still outside the specified values as noted in
Table 1 , repeat the
span procedures.
12 If the CAL GAS FAILED message appears, verify that the excess gas flow rate is still between 20 to
50 ml/min, then touch the monitor’s NORMAL SCREEN key and repeat the gas calibration procedures.
Note:
If the calibration fails, check the unit for leaks and/or a cracked water trap or a kinked hose.
13 Shut off the gas flow as soon as calibration is finished.
Table 1: Gas Readings
Calibration Gas
Bottle
Concentration
Required 91518 Indication
N
2
O 43% 39 – 47%
DES 5.0% 4.8 – 5.2%
O
2
46.5%* 44 – 49%
CO
2
5.5% 5.3 – 5.7%