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Summary of Contents for Aeroqual PCX
- Page 1 PCX Module Technical Guide MRK-D-0217 © Aeroqual Ltd. 2024...
- Page 2 Technical Guide Revision History Revision Affected Date Description of Change Number Sections July 2024 First release August Add V1.2 firmware and hardware updates 2024 MRK-D-0217 © Aeroqual Ltd. 2024...
- Page 3 PCX Module Technical Guide Table of Contents Introduction ........................... 4 1.1. PCX V1.0 Components ......................4 Diagnostic Data Channels ......................5 2.1. Particle Mass Module Channels (PM , PM , PM , PM , TSP channels) ......5 2.2. Particle Count Channels (PC0.3, PC0.5, PC1, PC2.5, PC5, PC10)........6 2.3.
- Page 4 1. Introduction This document contains a detailed guide of PCX module functionality, what all the channels mean, what expected values are, and a troubleshooting guide. The PCX module firmware contains several distinct sub-modules which operate in parallel. This allows the module to report more diagnostic data, to contain more module settings, and to have more error states reported in the form of sensor aging and sensor failure flags.
- Page 5 Diagnostic Data Channels The PCX module can report a maximum of six data channels, referred to as DATA1 through Diagnostics and Advanced Diagnostics DATA6. These are visible on Cloud via the page > 2.1. Particle Mass Module Channels (PM , PM...
- Page 6 20 indicates fouling error and high temperature error are both present). 2.2. Particle Count Channels (PC0.3, PC0.5, PC1, PC2.5, PC5, PC10) DATA1 (PCx) – Particle count with gain and offset applied. During a zero cycle or in the event of a sensor failure this channel is invalidated and •...
- Page 7 DATA3 (Board Temperature) – The temperature as measured on the PCB in the PCX module. DATA4 (Cumulative PM) – The cumulative amount of TSP the filter in the PCX module (in front of the flow sensor) will have seen. This value can be reset independent of the Cumulative PM values of the PM channels.
- Page 8 A value of 0 turns this alert off. Cumulative PM measurement reset flag - Set this value to a value TEMR greater than 0 to reset the cumulative PM for all PM channels PWML Factory offset MRK-D-0217 © Aeroqual Ltd. 2024...
- Page 9 This also opens the zero solenoid at the same time. Turn zero pump on during zero cycles = 1 • Turn zero pump off during zero cycles = -1 • MRK-D-0217 © Aeroqual Ltd. 2024...
- Page 10 (or ≤0) required. Set this value to 1440 to enable daily auto zero calibration. Mode configuration to work with old or new PCX hardware. Old hardware has the zero path going into the filter block. New hardware has the zero entering above the PM sensor.
- Page 11 50.0 Maximum allowed heater temperature TEMR Control coefficient PWML PWMH 85.0 Control coefficient Constant vs active heater control trigger. - Active heater control – set to 1 - Constant temperature – set to 0 GAIN MRK-D-0217 © Aeroqual Ltd. 2024...
- Page 12 3.5. Service Actions - Quick Lookup Below are some typical tasks you may want to do associated with a PCX module and what steps need to be taken to achieve it. Desired Behaviour Action to Take Reset flow sensor cumulative PM...
- Page 13 This speeds up the zero process significantly. 4.1. Zero Calibration During a zero calibration the PCX is recalculates the user offset values in the counts to mass algorithm. Timing for when a zero calibration occurs and how long it runs for can be configured via Cloud/Connect by adjusting the relevant module parameter for any of the particle count sensor codes as described above.
- Page 14 4.3. Zero Hardware Operation Modes In firmware V1.2 and greater the PCX has an additional setting referred to as a ‘mode’ . The intent of this is to set the correct pump behaviour for the firmware running on V1.0 hardware vs when it’s running on V1.2 hardware.
- Page 15 This control algorithm is controlled based on the ambient temperature and humidity and sets the heater to a temperature that is sufficient to dry the air for an accurate measurement. MRK-D-0217 © Aeroqual Ltd. 2024...
- Page 16 Flow and Pump Control The PCX module can be configured to control to standard flow or volumetric flow as described in the previous section. If configured to control to volumetric flow, the system will use the temperature from the ambient temperature sensor for its calculations. If this sensor is...
- Page 17 Troubleshooting 8.1. PCX Error States The PCX module can provide more detailed error states than previous Aeroqual modules, however these are limited to being encoded using two status flags – a ‘Sensor Failure’ flag, and a ‘Sensor Aging’ flag. When the sensor failure flag is active, data for the failed sensor channel is invalidated and will not appear or be used in calculation or triggering alerts.
- Page 18 No new data from inlet • Check connection to heater HTEMP Sensor Failure heater • Replace heater No new data from T/RH • Check connection to T/RH AMB TEMP or Sensor Failure sensor sensor AMB RH • Replace sensor MRK-D-0217 © Aeroqual Ltd. 2024...
- Page 19 1L/min, inspect the membrane dampener in the flow manifold for leaks. • Check the flow meter you’re using is configured to the same settings as the flow meter in the PCX module (e.g. volumetric vs standard flow, and STP conditions Flow rate at the inlet •...
- Page 20 Firmware Revision Notes Release Date Version Changes V1.0 • Initial release of PCX firmware. August 2023 • Improved flow control and speed of flow adjustment. • Improved heater control algorithm. V1.1 • Resolved errors around ‘Sensor Failure’ reporting when the July 2024 sensors hadn’t failed.
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