B08_Salient_Characteristics_attachment_1.docx
DOCX document 19 KB Posted
- Attached to
- Brand name or Equal to SeapHOX Federal contract opportunity
- Solicitation number
- 140G0125Q0205
About this file
The document is a Salient Characteristics file detailing technical specifications for a pH, conductivity, temperature, and dissolved oxygen (CTD) sensor for the U.S. Geological Survey's Oklahoma Texas Water Science Center. The sensor is required for water quality research in coastal environments, specifically for an Ocean and Coastal Acidification (OCA) monitoring station in Galveston Bay, with critical parameters for assessing changes in ocean and coastal systems.
The sensor must meet precise technical requirements, including a pH range of 6.5-9 with 0.05 accuracy, temperature resolution of 0.0001°C, conductivity measurement from 0-70 mS/cm, and dissolved oxygen accuracy of 0.1 mg/L. Additional specifications include physical dimensions not exceeding 75 cm in length and 30 cm in diameter, operational temperature range of 0-50°C, salinity tolerance of 1-45 ppt, compatibility with external water pumps and data loggers, and power input not exceeding 18 VDC. The solicitation (140G0125Q0205) is a small business set-aside under NAICS code 334519, with an anticipated award date of 09/10/2020 and delivery required within 45 days of purchase order receipt.
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Other files for this federal contract opportunity
| File | Type | Posted |
|---|---|---|
| B08__Instructions_To_Offerors_Attachment_2.docx | DOCX document | |
| Sol_140G0125Q0205.pdf |
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Text version
SALIENT CHARACTERISTICS
The Oklahoma Texas Water Science Center (Gulf Coast Branch) requires the purchase of a sensor to measure pH, conductivity, temperature, and dissolved oxygen (CTD) for research on water quality in coastal environments, specifically for a new Ocean and Coastal Acidification (OCA) monitoring station in Galveston Bay. This station aims to establish baseline conditions for carbonate system stressors and to develop a framework for understanding current and future coastal acidification that integrates monitoring data from the multiple monitoring efforts across the Gulf of America. Ocean acidification, caused by local and regional effects from eutrophication, upwelling, and freshwater flow into coastal systems, decreases pH and increases pCO2 in seawater and carbonate-ion concentration. This process has a significant impact on calcifying organisms such as shellfish, oysters, and other organisms with calcium carbonate structures, which are critical for local economies dependent on fisheries. pH and CTD are key parameters for assessing changes in ocean and coastal systems, and the sensor used must have sufficient precision to accurately capture long- and short- term changes. The ability to accurately collect high resolution, long-term ocean acidification data on coastal water quality system parameters, is essential to effectively achieve project objectives, thus a sensor capable of integrating to existing systems is needed.
Item 1: pH CTD and DO sensor system
· System is composed of integrated pH, conductivity, temperature, and dissolved oxygen sensors that allow user programmable measurement intervals.
· System shall contain antifouling components.
· Must measure the pH of seawater using reference electrodes with an ion-sensitive field-effect transistor.
· pH:
· Must have a range of at least 6.5 – 9.
· Must have an accuracy of ± 0.05.
· Must have a resolution of ± 0.004.
· Temperature:
· Must have temperature resolution of 0.0001°C.
· Must have an accuracy of 0.01 °C.
· Conductivity:
· Must be able to measure from 0-70 mS/cm
· Must have an accuracy of ±0.003 mS/cm
· Must have a resolution of ±0.0001 mS/cm
· Dissolved oxygen:
· Must have an accuracy of ±0.1 mg/L.
· Must have a resolution of ± 0.2 µmol/kg.
· Must not exceed 75 cm in length and 30 cm in diameter.
· Must be able to operate at temperatures ranging from 0 - 50°C.
· Must be able to operate at salinities ranging from 1 to 45 ppt.
· Must be able to connect to external water pump.
· The system shall provide data via RS-232 and have the capability to integrate with a user provided datalogger.
· Must allow for external power.
· Must not require input voltage exceeding 18 VDC.
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