Fluorescence Dissolved Oxygen, pH and Temperature 3-in-1 Meter

Model：

HD-YR20

Introduction：

Fluorescence Dissolved Oxygen, pH and Temperature 3-in-1 Meter measures dissolved oxygen, pH and temperature online by the fluorescence quenching principle. Widely used for wastewater treatment, aquaculture and environmental monitoring....

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Technical Specifications
Product video

I. Product Overview

The three-in-one fluorescence dissolved oxygen / pH / temperature analyzer works on the quenching principle of the active fluorescence of specific substances in physics. Modulated green light illuminates the fluorescent substance and excites it, and red light is emitted. Because oxygen molecules can take away energy (quenching effect), the time and intensity of the excited red light are inversely proportional to the oxygen molecule concentration. A red light source synchronous with the green light is used as a reference; the phase difference between the excited red light and the reference light is measured and compared with the internal calibration value to calculate the oxygen molecule concentration, and the final value is output after temperature compensation. It is widely used in tap water, sewage, petroleum, chemical, aquaculture, metallurgy, power, food, pharmaceutical, papermaking, agricultural irrigation, domestic water and mining applications.

II. Key Features

1. LCD screen with a Chinese interface, making operation simple and convenient.

2. Imported TI chip and anti-interference circuit for higher precision and greater stability.

3. Photoelectrically isolated 4–20 mA current output and RS-485 / RS-232 communication interface.

4. Adjustable hysteresis (dead band) prevents the relay from switching too frequently.

5. Built-in watchdog; data retention after power failure exceeds 10 years.

6. Dual-relay upper and lower limit alarm output.

7. The sensor is temperature-compensated, which corrects the influence of temperature on the dissolved oxygen value.

8. Physical measurement method; no electrolyte consumption and no periodic maintenance.

9. Unique protective cap design prevents the membrane from being damaged by impact with hard objects during use.

10. Special functional requirements can be customised.

III. Technical Specifications

Dissolved oxygen range	0–20 mg/L or 0–20 ppm
Dissolved oxygen resolution	0.01 mg/L or 0.01 ppm
pH range	0–14
pH resolution	0.01 pH
Temperature range	0–65 °C
Temperature resolution	0.1 °C
Power supply	AC 220 V / DC 24 V, input power ≥ 5 W
Output	RS485, 4–20 mA, relay (optional), HART protocol (optional), NB / GPRS / LORA communication (optional)
Protection class	IP65 (controller) / IP68 (sensor)
Operating temperature	0–60 °C (non-freezing)
Storage temperature	−10–60 °C
Installation	Top-mount / top flange / side-wall / pipe / immersion
Controller dimensions	Wall-mounted, 156 × 150 × 85 mm
Cut-out size	Wall-mounted, 156 × 94 mm
Cable length	10 m standard (extendable on request)

The video is currently in production, please stay tuned......

Fluorescence Dissolved Oxygen, pH and Temperature 3-in-1 Meter

I. Product Overview

II. Key Features

III. Technical Specifications

Shandong Horde Electronic Technology Co., Ltd.

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