Teledyne BDS-3960 operating instructions Stability, Maintenance

Operational Theory BDS 3960

hydrogen, it reads 100% lower. For example, when the float ball in the flowmeter is at 0.5 SLPM, the actual flow rate of hydrogen is about 1 SLPM.

The BDS oxygen sensor can tolerate exposure to acidic gases. Up to 0.2% CO2 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

Teledyne Analytical Instruments 24