Sensor errors
Aeroqual Connect and Aeroqual Cloud report two different types of error condition in the banner at the top of the screen. These are ‘sensor offline’ and ‘sensor failed’. Both error types are recorded in the monitor’s journal.
Sensor offline
A sensor offline error is usually caused by a loose power connection or a loose communications connection. Check the module connections are secure. If the power connections and the communications connections are secure, the issue may be inside the module. Contact the Aeroqual distributor in your local country for technical support.
Sensor failure
A sensor failure error can occur for different reasons. Sometimes it’s related to a sensor parameter exceeding an allowable value. If the sensor’s baseline resistance has reached the point where it’s impossible to calibrate within specifications, it should be replaced. Contact the Aeroqual distributor in your local country for technical support.
Values from incorrect time period
If you see values from an unexpected time period in Aeroqual Cloud, try these common troubleshooting checks:
- Check the time zone configuration of the monitor.
- Check the connection from the monitor to Aeroqual Cloud. Make sure the local monitor settings are compatible with your network. If using mobile, check for signal or billing issues.
- Check the monitor is powered on and is recording data in Aeroqual Connect.
Communication errors
Failure to see the WIFI network broadcast by the monitor
If you can’t see the monitor in your list of Wi-Fi networks, it’s most likely because the Wi-Fi setting is set to ‘Client Mode’ and isn’t broadcasting. To resolve this, connect to the monitor through the Wi-Fi LAN and reset the Wi-Fi mode to ‘Access Point’. Alternatively, the monitor can be reset to factory communication settings by using the USB reset procedure.
Error 500
This error is known to occur with the internal database when trying to connect to the local interface (Connect). Clear your internet browsing history and try again. Try restarting the monitor. Sometimes a component in the embedded PC needs to be replaced. Contact the Aeroqual distributor in your local country for technical support.
Internal temperature not stable
The internal temperature should remain stable at the instrument set point. See this user guide for how to check and set the internal temperature (ITemp) set point. A failure in the internal temperature is evident in the charts:
Common troubleshooting tasks
| Fault | Possible causes | Solutions |
|---|---|---|
| Gas readings | ||
| Negative readings | Insufficient warm up | Allow monitor to warm up |
| Flow leak or incorrect flow | ||
| Dirty inlet gas filter | Change filter | |
| Incorrect zero calibration | Perform zero calibration | |
| Gas readings noisy or unstable | Flow leak or incorrect flow | |
| Module is aging | Replace module | |
| Gas readings significantly different than expected | Incorrect gain or offset applied | Check the correct gain has been applied correctly |
| Incorrect calibration performed | Incorrect gas cylinder used, or gain calculated incorrectly | |
| Gas modules | ||
| NO2 or NOx values very high | Possible Ozone scrubber failure | Correct or replace scrubber |
| NO2 > NOx | Incorrect gain or offset applied | Check the correct gain has been applied correctly |
| Incorrect calibration performed | Incorrect gas cylinder used or gain calculated incorrectly | |
| Particle monitor, particle profiler & PCX | ||
| PM2.5 > PM10 | Cyclones fitted on the wrong side | Swap cyclones to correct side |
| Auto zero calibration failing on the PM10.0 | Check baseline calibration of PM10 | |
| Incorrect gain applied | Change filter | |
| Leak in flow system | Check for leaks | |
| Negative numbers | Auto zero calibration failing | Check baseline calibration of PM10 |
| Readings lower than expected | Flow rate too low | Check flow rate change pump if required |
| Dirty optics | Have optical module serviced | |
| Failed laser | Have optical module serviced | |
| Dirty sample filters | Change filter | |
PCX Error Lights
The PCX module contains two LED which can indicate module status. The main LED, which is present on all Aeroqual modules, and a secondary LED which can indicate additional states unique to the PCX module.
| LED Color | Device State | |
| Main LED | Solid Green | Normal operation |
| Slow Flashing Green | Device warming up | |
| Rapid Flashing Green | Sensor failure error | |
| Secondary LED | Solid Green | Normal operation |
| Flashing Green | Device warming up | |
| Solid Red | Sensor failure error | |
| Flashing Red | Comms error with EPC | |
| Solid Orange | Zero calibration in progress |
PCX Specific Error States
The PCX module can provide more detailed error states than previous Aeroqual modules. The table below summarizes which error states the module may present, the possible cause, and the recommend action the user should take.
| Measurement Channel | Error State | Possible Cause | Recommended Action |
| Particle Mass | Aging | PM Sensor cumulative PM exceeded | · Check PM sensor connection. |
| Failure | PM sensor comms error or PM sensor reporting an error | · Check PM sensor to see if data is present. If no data, check cable. If data present, return to service center for PM sensor replacement | |
| Particle Counts | Failure | PM sensor comms error or PM sensor reporting an error | · Check PM sensor to see if data is present. If no data, check cable. If data present, return to service center for PM sensor replacement. |
| Flow | Aging | Cumulative PM for flow sensor channel exceeded. | · Replace primary filter. |
| Failure | No new data from flow sensor. | · Check flow sensor connection. | |
| Pump Speed | Aging | Pump PWM outside of expected range | · Check system for leaks |
| Failure | Pump PWM is non-zero, but pump speed (tacho) reads zero | · Check pump cable connection | |
| HTEMP | Failure | No new data from inlet heater | · Check connection to heater |
| Temp/RH | Failure | No new data from T/RH sensor | · Check connection to T/RH sensor |
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