The Pyxis ST-774 dissolved oxygen sensor from the United States is used to measure the dissolved oxygen content in water based on the principle of fluorescence quenching. ST-774 integrates Pyxis' advanced technology in the field of fluorescence detection, using dual light source detection technology of excitation light source and reference light source, and adopting ultra sensitive fluorescent indicators. Through special processing methods, it ensures the accuracy of ultra-low end dissolved oxygen content measurement while greatly improving its measurement range, reaching 0-40ppb. At the same time, the sensor integrates temperature and pressure sensors, which can compensate for temperature and pressure in the measurement of dissolved oxygen. The replaceable fluorescent cap at the front end of the sensor is completely independently developed by Pyxis, with a typical service life of up to two years; The sensor is covered with black microporous PTFE material, which is extremely scratch resistant. The front end of the sensor is designed as a flat structure, which is not easy to contaminate and is easy to clean. The sensor body is made of 304 stainless steel material, which is more sturdy and durable.

Typical applications

Applied to the monitoring of trace dissolved oxygen in water quality in industrial processes such as power, semiconductor, medicine, metallurgy, building materials, and environmental protection.

Product Features

• Adopting ultra sensitive fluorescent film, with a lifespan of up to two years and scratch resistance; No flow rate or agitation requirements; No need to replace solid-state electrodes/electrolytes, low maintenance costs
• 1 million measurements, with an attenuation error of only 0.1 ppb
• The single measurement error is controlled at 3ppb/3 σ
• Built in temperature and pressure sensor with automatic compensation, accurate and stable measurement, ultra-low drift
• Built in transmitter, no need for preamplifier or header, directly outputs RS485 or 4-20mA isolated signal, more stable and accurate long-distance transmission
• Calibration, data recording, and diagnosis can be performed on personal computers or smartphones through Bluetooth/USB adapters. The sensors can be slope calibrated using air or saturated air-water, and zero calibrated using saturated oxygen free water or nitrogen
• Optional immersion and pipeline installation components, suitable for dissolved oxygen monitoring in filters such as sewage and tap water