How to integrate the world’s smallest NDIR sensor: eLichens’ Cranberry
eLichens’ Cranberry gas sensor
It is a cutting-edge NDIR (Non-dispersive Infrared), dual-channel gas sensor integrated in the smallest form factor on the market: 20 x 20 x 10 mm3 (see Figure 1).
Figure 1: eLichens’ Cranberry NDIR gas sensor
This sensor is based on eLichens’ patented technology including a proprietary IR micro-source, patented optical design and advanced signal processing algorithms. It provides Cranberry the lowest power consumption and the highest stability on the market in an ultra-compact form factor (see Figure 2 for exact dimensions).
Figure 2: eLichens’ Cranberry mechanical dimensions
A noticeable characteristics of Cranberry form factor is the absence of external pins to connect the sensor. The pins are, indeed, metallic pads located below the sensor and which need to be connected through spring contacts, as highlighted in Figure 3 hereafter.
Figure 3: Cranberry integration scheme on a PCB.
The spring contacts are used to electrically connect the sensor bottom pads to its host PCB. The product housing is used to secure the sensor at its desired location and apply enough load on the spring contacts. Recommended dimensions are presented in Figure 3 and an example of a customer integration is presented in Figure 4.
Figure 4: Integration of a Cranberry sensor into a product
It is interesting to note that, in this example of integration, the front cover is held in place with four screws. This guarantees an easy access to the sensor with only a basic tool, which can be interesting if the application requires the sensor replacement at fixed intervals, for example.
eLichens’ Cranberry sensors come with the smallest formfactor on the market for a NDIR sensor, along with the lowest power consumption and a high stability. These are key differentiators and allow the development of innovative battery-powered safety products. For example, personal gas detectors fitting in the palm of a hand and able to run months or years one a single cell battery are now becoming a reality.