PTSA UV Fluorescence Sensor

PTSA UV Fluorescence Sensor

Organic matter dissolved in water, such as CDOM/fDOM, is an optically measurable component of organic matter dissolved in water. For example, petroleum, monocyclic polycyclic aromatic hydrocarbons dissolved in water after emulsification, and PTSA used for water treatment process monitoring all emit fluorescence longer than the absorption wavelength under the excitation of ultraviolet short wave light.

Frog Vision provides a UV fluorescence sensor for detecting fluorescent agents such as CDOM/fDOM, petroleum, PTSA, etc. in water.

Advantages: • Adopting fluorescence method; Only a small distance from the obstacle is needed to avoid its impact; • Implement long-term online monitoring; Using PTSA solution calibration, it has good linearity with the vast majority of fluorescent organic compounds to be detected by users. • Note: PTSA (1,3,6,8-pyrene tetrasulfonic acid tetrasodium salt, CAS accession number 59572-10-0)

PTSA UV Fluorescence Sensor

Precautions for on-site installation:

1. On site, depending on the actual situation, the sensor can be fixed with a 6-point (3/4 NPT) thread or installed with accessory brackets, or other installation methods that can fix the sensor.

2. Fixed installation is preferred for installation, and drag chain installation is prohibited.

3. During installation, full consideration should be given to water flow and liquid level changes to ensure that the water flow can cross the optical path, and the sensor should be located at a depth of 10cm or more underwater. Avoid bubbles appearing on and around the surface of quartz glass.

4. The shielded wire needs to be grounded together with the equipment, and the sensor does not support hot swapping.

Calibration:

The sensor supports 1-point or 2-point calibration, and it is generally recommended to use zero point and 300ppb PTSA two-point calibration.

Deionized water is used as the zero point for the standard solution, and a 300ppb PTSA solution is used for the second point calibration. Or use a known concentration liquid provided by the user.

Firstly, restore K and B values to their default values, K=1，B=0;

2. Place the sensor in deionized water (avoid direct sunlight on the light window), and read the value. For example, if the value is 0.2ppb, record it as X.

3. Place the sensor in 300ppb (PTSA) and repeat step 2, recording the value as Y.

4. Record the values of K and B using the following formula: K=1/(Y-X), B=- KX

5. Write K and B values into the sensor. Refer to the Modbus interface documentation for the writing method.

Attention: The above calibration needs to be carried out in a solution at room temperature of 25 ± 3 ℃ and indoor environment.