Teledyne MD300 - Oxygen analyzer and monitor (Diving) - Manual (Page 24)

Operation AD300/MD300
Teledyne Analytical Instruments 24
Figure 2-11: High Pressure Gas Sampling
When monitoring for oxygen in confined volumes such as a diving
bell, the flow diverter must be removed from the R17S sensor so that it
does not interfere with the rapid exchange of gases to and from the
sensing surface of the sensor.
CAUTION: FAILURE TO REMOVE THE DIVERTER IN THESE
APPLICATION AREAS WILL RESULT IN A MARKED
LOWERING OF THE RESPONSE TIME OF THE
SENSOR.
The LOCK/UNLOCK key can be used to prevent accidental
changes to the front panel key adjustments. The LOCK/UNLOCK key
acts as a toggle, pressing LOCK/UNLOCK once renders inactive all
keys except the ALARM SILENCE () and BATT TEST (MD300
only) keys. Pressing LOCK/UNLOCK a second time unlocks the
keypad.
2.3 Gas Sampling/Sensor Issues
2.3.1 Temperature
The R17S oxygen sensor adjusts for ambient temperature changes
in the range of 0–40°C (32–106°F). However, a small thermal tracking
error may be encountered when the sensor is subjected to sudden
changes in temperature. For example removing the sensor from an air
conditioned car to a hot environment. Holding the sensor in your hand