Rae QRAE 3 User Manual

Also see for QRAE 3: Quick start guide

Rae QRAE 3 User Manual Manual pdf 42 page image

3912. MaintenanceThe QRAE 3 requires little maintenance, aside from replacing sensors, the filter, and the battery.If the instrument is equipped with a pump, it may need replacement, as well.12.1. Replacing The FiltersPumped VersionIf the external filter is dirty or clogged, remove it by unscrewing it from the inlet. Discard it andreplace it with a new filter.IMPORTANT! A pumped QRAE 3 must not be calibrated or operated without a filter.Operation without a filter may damage the instrument.12.2. Removing/Cleaning/Replacing Sensor ModulesWARNING! Do not replace sensors in hazardous locations.All sensors are located inside the sensor compartment in the upper half of the QRAE 3. They areaccessed by removing the four screws in the top portion and then turning the instrument over andlifting off the sensor cover.1. Turn off the instrument.2. Remove the four screws holding the sensor compartment.3. Turn over the instrument and remove the cover. The sensors are plugged into the slots.4. Gently lift out the desired sensor module with your fingers.5. Install the replacement sensor. Make sure the electrical contact pins are aligned with theholes in the PC board and that the sensor is seated firmly.6. Replace the cover and tighten the four screws.IMPORTANT! Always perform a full calibration after replacing sensors.