Bacharach 450 Operating & Maintenance Instructions
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Maintenance ECA 45066 Instruction 0024-94004.4.2 Nitric Oxide Sensor Battery ReplacementA single lithium battery, located on top of the Nitric Oxide printed circuitboard, applies a bias voltage to the NO sensor to prevent the sensor fromdestabilizing when the analyzer is turned off. This battery has a lifeexpectancy of at least 2 years.Replace the Nitric Oxide bias battery toward the end of its life expectancy, orwhen its voltage drops below 2 volts.Tip: Replace the bias battery whenever the NO sensor is replaced.Material Required:• Medium Phillips screwdriver• Bias battery (refer to Section 6.1)Procedure:1. Remove two screws from sensor-cover plate, and then remove plate togain access to sensor compartment. See Figure 4-3.2. Remove old battery from its holder on the Nitric Oxide printed circuitboard.3. Insert new battery (positive side facing upwards) into holder.4. Install sensor-cover plate that was removed in Step 1.5. Before powering up and using the analyzer, allow the Nitric Oxide sensorto stabilize as described below. Note that recalibration of the Nitric Oxidesensor is not required after replacing its bias battery.Depending on how long the Nitric Oxide sensor was without bias voltage,the time required for the sensor to completely stabilize varies from lessthan a minute to several days. Typical stabilization times are shownbelow. Generally, however, the sensor is sufficiently stable after 4 hoursfor measurement purposes.Bias removed for . . . Stabilization timeLess than 15 minutes Less than 1 minuteLess than 1 hour Less than 5 minutesLess than 2 days Less than 4 hoursGreater than 2 days Up to 2 days |
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