Operation 3000ZA
Teledyne Analytical Instruments 50
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.