Used YSI 6920 V2-2 Water Quality Sonde
- Internal battery pack & memory for long-term, unattended deployments
- All sensors are field-replaceable, and optical sensors feature self-cleaning wipers
- Compatible with NexSens real-time data logging systems
|6920V2-R||Used 6920 V2-2 Sonde with temperature/conductivity sensor|| |
|Usually ships in 3-5 days|
|655564||5564A amplified pH sensor|
|655565||5565A amplified pH/ORP sensor|
|6136-R||Used 6136 turbidity sensor with self-cleaning wiper|| |
|6091-R||Used 6091 field cable, 25 ft.|
|6160-R||Used 6160 flow cell, for use with YSI 6820 & 6920|
Perfect for harsh fouling environments, YSI's optical sensors feature an integrated wiper that prevents the impacts of biofouling, a corrosion-resistant titanium wiper shaft, and replaceable seals.
The YSI 6920 V2-2 sonde features an internal battery pack with memory for long-term, unattended deployments. Additionally, the sonde can be powered by a 650 display unit for spot sampling applications.
The YSI 6920 V2-2 has the following available ports:
- (1) Temperature/Conductivity
- (1) pH or pH/ORP
- (1) ISE (Nitrate, Ammonium, or Chloride)
- (2) Optical (Dissolved Oxygen, Turbidity, Chlorophyll, Blue-Green Algae, and/or Rhodamine)
- Medium: Fresh, sea, or polluted water
- Operating Temperature: -5 to +50 C
- Storage Temperature: -10 to +60 C
- Communications: RS-232, SDI-12
- Software: EcoWatch
- Diameter: 2.85" (7.24cm)
- Length: 18" (45.7cm)
- Weight: 4 lbs. (1.8kg)
- Internal Power: 8 AA-size alkaline batteries
- External Power: 12 VDC
- (1) YSI 6920 V2-2
- (1) Temperature/conductivity sensor
- (1) Soft-sided carrying case
- (1) EcoWatch for Windows software CD
- (1) Calibration cup
- (1) Probe guard
- (1) 6-Series operations manual
- (1) Maintenance kit
The initial power up can make the first two DO% readings read low. These readings can be disregarded.
A sonde (even if cleaned properly) can contaminate to almost 1.0 NTU. Typically the average contaminant level ranges from 0.2 to 0.8 NTU. With this knowledge, you can enter this offset (0.5 NTU) using the sonde's One-Point Calibration feature. This calibration is only done after a two- or three- point calibration is completed. To do a One-Point Calibration after a two- or three- point calibration: Place the sonde in a container of zero standard or filtered DI water. Use of the supplied calibration/storage cup is recommended; however, any generic glass or plastic container can be used as long as the probe guard is installed. Enter the Turbidity offset as 0.5 NTU, operate the wiper and inspect for air bubbles. Wait at least 60 seconds after the last wiper to accept the calibration point.
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Those changes are driven, in part, by the way the land in a watershed is used and they’re big enough that researchers may need to change the way they think about water quality in the American rivers.
“What was striking to us was how perceptions of water quality issues from several decades ago may need to be updated,” said Edward Stets, a U S Geological Survey research ecologist, in an email response to questions from Environmental Monitor.
New research by Stets published in Environmental Science &; Technology in March highlights these shifting water quality issues.Read More
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Next comes several hundred more meters of wire before arriving at several glass balls, more floatation orbs.Read More
This spring, palm warblers, rose-breasted grosbeaks, tree swallows and great blue herons fill Muskegon Lake Nature Preserve with their songs or stately presence.
In 1997, the preserve was a dump.
The community partnerships and restoration efforts that turned a dump in one corner of Muskegon Lake in west Michigan into a haven for plants, wildlife and recreational fishers ran parallel to other efforts around the lakeshore and the Great Lakes since 1985.
In 1985, the United States and Canada chose to focus environmental cleanup efforts on 42 highly polluted areas of concern (AOCs ) around the Great Lakes, including Muskegon Lake.
Thirty-five years later, that decision has changed environmental remediation and benefited Great Lakes communities.Read More