Operation | 3000ZA | |
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|
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80 0.8 16.8
90 0.9 18.4
100 1.0 20.0
The analog output signal has a voltage which depends on the oxygen concentration AND the currently activated analysis range. To relate the signal output to the actual concentration, it is necessary to know what range the instrument is currently on, especially when the analyzer is in the autoranging mode.
To provide an indication of the range, a second pair of analog output terminals are used. They generate a steady preset voltage (or current when using the current outputs) to represent a particular range. The following table gives the range ID output for each analysis range:
Table 4-2: Range ID Output Voltage
| Range Voltage (V) | Current (mA) |
LO | 0.25 | 8 |
MED | 0.50 | 12 |
HI | 0.75 | 16 |
IMPORTANT: In the event of loss of flow through the analyzer, if the vent is vented to a location of high oxygen content, oxygen will back diffuse through the vent line and enter the cell. This can saturate the cell with oxygen and require a long purge down time before the sensor can recover. However, the ZrO2 sensor recovers faster than the microfuel oxygen sensor. In the event that flow is to be interrupted into the analyzer, it is suggested that the user do one of the following:
1.Bag the sensor in nitrogen during this time
2.Install a shut off valve on the vent port of the analyzer or somewhere within the users sample system.
Teledyne Analytical Instruments | 50 |
