Teledyne BDS-3000 - Oxygen analyzer - Manual (Page 27)

Oxygen Analyzer Operational Theory
Teledyne Analytical Instruments 13
The BDS oxygen sensor can tolerate exposure to acidic gases. Up
to 0.2% CO
2
has no effect to ppb level oxygen measurement.
2.2.7 Stability
The BDS sensor is essentially drift free. Typically a BDS sensor
requires no re-calibration over an entire year period. However, there
may be some intrusion to the zero during the maintenance. See next
section for details.
2.2.8 Maintenance
The only maintenance required on the BDS sensor is to replenish
distilled or de-ionized water every three to four months. It is not
necessary to take the analyzer out of service while adding water to the
sensor but caution should be taken to avoid spilling water on the PC
boards or other area inside the analyzer.
Figure 2.5: Adding DI Water to the BDS Sensor
There is a Max line and Min Line clearly marked on the BDS
sensor body. It is a good practice to check the electrolyte level every
month and add de-ionized water into the sensor whenever it is
convenient.
When running dry gas through the sensor, the gas carries out
moisture from the sensor. Therefore, the electrolyte (10% KOH in