550A-12- Portable dissolved oxygen analyzer

The YSI 550A adopts a fully waterproof (IP67 waterproof rating) and impact resistant instrument housing, and features an innovative field replaceable dissolved oxygen electrode module. Using YSI's proven polarographic technique and YSI's globally renowned thermistor technique, dissolved oxygen and temperature can be measured simultaneously. The new generation of PE cover film provides faster reaction time and lower stirring dependence.

YSI550A-12 Portable Dissolved Oxygen Analyzer Product Features

◆ Fully waterproof, compliant with IP67 waterproof rating
◆ Field replaceable dissolved oxygen electrode module
Faster reaction time, lower stirring dependence
Stainless steel probe, sturdy and durable, easier to sink into water
Install stress relievers at both ends of the cable interface to reduce material fatigue at the connection and effectively extend the cable's lifespan
◆ Built in dissolved oxygen calibration room/probe storage room, convenient to carry and maintain the normal working state of the probe
◆ Available with 3.7, 7.5, 15, and 30 meter cables for selection
The measurement range of dissolved oxygen has been expanded to 50 milligrams per liter
◆ Air saturation or milligram/liter calibration mode
◆ 2000 hours of ultra long battery life

Technical parameters:

YSI 550A System Specifications
Technical indicators for measuring parameters
temperature	measuring range resolution accuracy	-5 to+45 ℃ 0.1℃ ±0.3℃
dissolved oxygen (% air saturation)	measuring range resolution accuracy	0 to 500% 0.1% or 1% air saturation (optional) 0 to 200%: ± 2% of the reading or 2% air saturation, whichever is greater; 200 to 500%: ± 6% of reading
dissolved oxygen (milligrams per liter)	measuring range resolution accuracy	0 to 50 milligrams per liter 0.01 or 0.1 milligrams per liter (optional) 0 to 20 milligrams per liter: 0.3 milligrams per liter or ± 2% of the reading, whichever is greater; 20 to 50 milligrams per liter: ± 6% of the reading
Note: The instrument accuracy specification is the sum of the host and probe

Other technical indicators
working conditions	Water bodies: freshwater, seawater, or sewage; Temperature: -5 to+45 ℃
Dissolved oxygen reaction	Reaching 95% of the final value within 9 seconds
Salinity compensation	0 to 70 ppt
Waterproof specifications	IP67 waterproof rating
power supply	4 No. 2 alkaline batteries (25 ℃, over 2000 hours)
cable	Available in 3.7 meters, 7.5 meters, 15 meters, and 30 meters for selection
size	22.9 centimeters (length) x 11.9 centimeters (width)
weight	0.91 kg (including battery)
defects liability period	Host: Three years; Probe and cable: one year

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