SA9LNx Dual-wavelength Nitrate Detecting Sensor

Utilizing state-of-the-art flashing Xenon lamp technology, combining spike filters and hi-sensitive photoreceptors, SA9LNx is a Dual Wavelength Absorption Spectral Detecting Sensor designed for long-term, low-drift monitoring of water quality.
The target parameter Nitrate is measured by the Beer-Lambert law at 220nm.
A second absorbance spectrum at another UV wavelength represents the reference absorption from Turbidity/SS (suspend solid) and Dissolved Organic Carbon (DOC).
Built-in correction or compensation minimizes interferences.
The following diagram shows the relation between the targeted nitrate parameter and interference compensation spectra.

The SA9LNx Sensor is available in various optical paths with typical path lengths: 1mm and 2mm. Different paths meet the requirement of different ranges.
In-situ installation is recommended for SA9LNx.
The fully submersible probe can be simply put into tanks, open channels etc.
However, a sampling flow cell can be used if in-situ mounting is difficult. Sensor includes hard-wearing sapphire windows, with spray nozzles aiming at the windows for air or water purging to keep the windows free from fouling.
An optional clamp-on wiper could be used to remove buildup or coating on the windows if no pressurized air or water is available.
Therefore, the sensor is particularly low maintenance even under harsh conditions.

SA9LNx sensor connects to Delta-Phase General Display & Controllers, (GDCs), by RS485 Modbus communication.
Equipped with Delta Phase ViewTM software, GDC-04/6/8 can offer flexible calibration or configuration to the SA9LNx sensor with features such as fast setup, data logger, analogue outputs. multiple protocols, etc.
As the protocol is open, SA9LNx is compatible with other terminals from third parties as well.