MODIFICATION
66 -- Environmental Chamber for a Diffractometer
- Notice Date
- 3/11/2010
- Notice Type
- Modification/Amendment
- NAICS
- 334519
— Other Measuring and Controlling Device Manufacturing
- Contracting Office
- Department of Commerce, National Institute of Standards and Technology (NIST), Acquisition Management Division, 100 Bureau Drive, Building 301, Room B129, Mail Stop 1640, Gaithersburg, Maryland, 20899-1640
- ZIP Code
- 20899-1640
- Solicitation Number
- SB1341-10-RQ-0083
- Archive Date
- 3/30/2010
- Point of Contact
- Joni L Laster, Phone: 301-975-8397, Carol A. Wood, Phone: 301-975-8172
- E-Mail Address
-
joni.laster@nist.gov, carol.wood@nist.gov
(joni.laster@nist.gov, carol.wood@nist.gov)
- Small Business Set-Aside
- Total Small Business
- Description
- The purpose of this amendment is to respond to technical questions submitted, incorporate technical changes, and extend the due date for quotations. 1. The following questions and responses are hereby provided. Question 1) When the temperature is 20C in the adjoining room and raises 2.5C in an hour, then what is the expected temperature in the room in an hour, 22.75? Answer: If the temperature of the laboratory in which the chamber is situated goes from 20°C to 22.5°C in one hour, the chamber temperature is expected to rise no more than 0.25°C from whatever temperature it was at the beginning of the hour. The purpose of the system is to reduce the effect of fluctuations in laboratory temperature, not to eliminate the effects of a permanent change in laboratory temperature. Question 2) What will be the operating temperature of the room? Answer: The operating temperature of the laboratory will be between 21°C and 24°C. Question 3) What is the desired chamber temperature? Answer: There is no set desired chamber temperature. The system is designed to reduce fluctuations in temperature to a minimum, not to maintain a predetermined temperature. See the answer to question 1 above. 2. Line Item 0001 is hereby amended to incorporate changes to the technical specifications as follows: 2.1 Specification 3 is hereby amended as follows: FROM: 3. Temperature Control: The temperature inside the chamber shall be controlled by drawing the main lab air through the chamber using a circulation exhaust fan. The operating temperature of the chamber shall be dependent on the temperature of the air in the main lab, the heat generated by the diffractometer, and how much air is drawn through the chamber. The heat generated by the diffractometer cannot be accurately assessed because the x-ray tubes, which are the main source of heat, are water cooled so much of the heat generated by them is removed from the chamber by the chilled water line. The temperature of the chamber shall be actively controlled by monitoring the temperature of the exhaust air and controlling the speed of the fan. The sensitivity of the temperature monitor shall be ±0.05°C or better. Preference will be given to greater sensitivity. The temperature of the laboratory at a single position near the chamber can be monitored. It is required that the temperature stability of the chamber will be ten times better than the temperature stability of the laboratory; e.g., if the laboratory temperature varies by 2.5°C in a one hour period, the chamber temperature must vary by 0.25°C or less over the same period. There is no humidity control specification for the system. The final operating temperature of the chamber must be between 20°C and 25°C The temperature controlling system shall be software controlled and shall be able to provide a record of the chamber temperature and the laboratory temperature which shall be available by direct data transfer to a computer through a COM port or USB port. The software shall be off-the-shelf software that shall record automatically, every minute, and directly download. The temperature controlling system provided shall work with a personal computer running Windows XP. The Contractor shall provide the necessary cable. It must be possible to disable the active temperature control and directly control the speed of the fan using the software control. A personal computer is not required to be provided as part of the temperature control system. The Government will provide a personal computer with the serial parallel and USB ports. TO: 3. Temperature Control: The temperature inside the chamber shall be controlled by drawing the laboratory air through the chamber using a circulation exhaust fan. It shall be possible to actively control the temperature inside the chamber with a system that automatically monitors the temperature of the exhaust air and controls the speed of the fan. The sensitivity of the temperature monitor shall be ±0.05°C or better. Preference will be given to greater sensitivity. It is required that the temperature fluctuations of the chamber (with the door closed) be ten times less than the temperature fluctuations of the laboratory over a one hour period; e.g., if, in a one hour period, the laboratory temperature rises by 2.5°C and then falls to its original temperature, the chamber temperature must fluctuate by 0.25°C or less over the same period. It shall be possible to adjust the control parameters of the temperature control system remotely by computer. The chamber temperature shall be available by direct data transfer to a computer. The temperature controlling system provided shall work with a personal computer running Windows XP. The Contractor shall provide the necessary cable. It must be possible to disable the active temperature control and directly control the speed of the fan using the software control. A personal computer is not required to be provided as part of the temperature control system; the Government will provide a personal computer. There is no humidity control specification for the system. 3. The due date for quotations is hereby extended as follows: FROM: March 10, 2010 at 3:30 PM Eastern Time TO: March 15, 2010 at 3:30PM Eastern Time
- Web Link
-
FBO.gov Permalink
(https://www.fbo.gov/spg/DOC/NIST/AcAsD/SB1341-10-RQ-0083/listing.html)
- Place of Performance
- Address: 100 Bureau Drive, Gaithersburg, Maryland, 20899, United States
- Zip Code: 20899
- Zip Code: 20899
- Record
- SN02090150-W 20100313/100311235449-4cf8fab8afa828167b7e6915a1b66738 (fbodaily.com)
- Source
-
FedBizOpps Link to This Notice
(may not be valid after Archive Date)
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