IN Brief:
- SEN68 measures particulate matter, temperature, humidity, VOC, NOx, and formaldehyde through one compact sensing module.
- SEN69C adds carbon dioxide measurement, taking the platform to ten environmental parameters within the same product family.
- Both devices use Sensirion's new miniaturised SPS6x MEMS particulate component for denser equipment integration.
Sensirion has launched the SEN68 and SEN69C indoor air-quality modules, combining particulate, gas, temperature, and humidity sensing in one package and extending the SEN6x platform to formaldehyde measurement and, on the SEN69C, carbon dioxide.
The SEN68 measures nine environmental parameters: PM1, PM2.5, PM4, and PM10 particulate concentrations, temperature, relative humidity, VOC Index, NOx Index, and formaldehyde. The SEN69C adds CO2, taking the combined measurement set to ten.
At the centre of both modules is Sensirion’s new SPS6x particulate-matter component. The company describes the device as a miniaturised MEMS-based sensing element developed to reduce the space required for particle measurement, allowing particulate sensing to sit alongside several gas and environmental channels inside a compact module.
The integration changes the electronics and mechanical design required for a multi-parameter indoor monitor. A conventional architecture may combine separate particulate, carbon-dioxide, gas, temperature, and humidity sensors on one PCB, with each device bringing its own interface, placement, calibration, airflow, and power requirements.
Combining several channels behind one module can reduce that integration burden, although it also gives the equipment designer less freedom to choose each sensing element independently. The trade-off is particularly relevant in building controls and appliances where space, development time, and a consistent digital interface can matter as much as optimising one measurement in isolation.
Sensirion identifies indoor air-quality monitors, smart buildings, room sensors, air purifiers, and vape-detection systems among the applications for SEN68 and SEN69C. Those products use the same measurements in different ways: a purifier may feed particulate and gas readings directly into fan control, while a building system may use longer-term trends to manage ventilation.
Formaldehyde is one of the more notable additions. Sensirion only recently moved its dedicated low-power SFA40 formaldehyde sensor into global availability, giving designers the option of adding HCHO measurement separately. The SEN68 and SEN69C take the opposite approach by integrating formaldehyde with the wider environmental sensing stack.
That distinction allows Sensirion to address both architectures. A product that already has particulate and environmental sensing may only require a dedicated formaldehyde channel, while a new design can use a consolidated module and avoid assembling several sensors individually.
The SEN69C extends the integrated architecture further by adding CO2 measurement. Carbon dioxide is widely used as a proxy for ventilation and occupancy conditions in buildings, although system developers still have to consider measurement accuracy, placement, airflow, and the requirements of any building or indoor-air certification scheme being targeted.
Mechanical design remains important even when the sensing elements arrive as one module. Sample air has to reach the particulate and gas channels without being distorted by heat from processors, power devices, fans, or the enclosure itself. Response time also depends on whether the module is exposed to representative room air or trapped in a stagnant pocket inside the product.
The electrical design becomes simpler, but power consumption still has to be matched to the application. A continuously powered building sensor or purifier can accommodate a multi-sensor module more readily than a small battery-operated node, where the duty cycle and power budget may favour separate lower-power components.
Sensirion has introduced the SEK-SEN69C evaluation kit alongside the two modules, allowing developers to evaluate the combined measurement set before completing their own hardware. That is particularly useful where several channels will be fused into a control algorithm or classification system rather than displayed separately.
The SEN68 and SEN69C continue the movement from individual environmental sensors towards compact sensing subsystems. Their practical advantage will depend on how well the integrated measurements fit the target product, but combining particulate matter, formaldehyde, VOC, NOx, temperature, humidity, and CO2 behind one platform removes a substantial amount of component-level integration from the equipment designer.