Purchase_Description_(PD)_19M-596A-B-FO_Rev._1_dated_3_December_2018.pdf

19M-596A/B-FO

3 December 2018

Rev 1

PURCHASE DESCRIPTION

FOR

AFPSL – 2.5k Load Cells / AFPSL – 10k Load Cells

1.0 SCOPE: This purchase description identifies performance requirements for the 2.5k Load Cell (Tovey Engineering, P/N CS10-2.5K-B300) and the 10k Load Cell (Tovey Engineering, P/N CS10-10K- B300) used at the AFPSL.

2.0 2.5k Load Cell PERFORMANCE REQUIREMENTS:

2.1 Accuracy Requirements:

2.1.1 Lower Load Limit: The 2.5k load cell shall meet ASTM E74 Class A lower load limit to 2% of range and Class AA lower load limit to 10% of range (When calibrated with primary standards)

2.1.2 Static Error Band: The Static Error Band shall not exceed +/- 0.030% of rated output.

2.1.3 Nonlinearity: The nonlinearity shall not exceed +/- 0.030% of rated output.

2.1.4 Hysteresis: The hysteresis shall not exceed +/- 0.030% of rated output.

2.1.5 Non-repeatability: The non-repeatability shall not exceed +/- 0.005% of rated output.

2.1.6 Creep: The error caused by creep shall not exceed +/- 0.006% in two minutes.

2.1.7 Drift: The drift shall not exceed 0.025% over a 12 month time frame.

2.1.8 Ascending Curve Standard Deviation: The standard deviation of the Ascending Curve shall not exceed 0.001% FS when used with the C3-100 Tovey Vertical Force Press and Tovey software.

2.1.9 Descending Curve Standard Deviation: The standard deviation of the Descending Curve shall not exceed 0.0015% FS when used with the C3-100 Tovey Vertical Force Press and Tovey software.

2.2 Temperature Requirements:

2.2.1 Temperature Effect on Sensitivity: The temperature effect on sensitivity shall not exceed +/- 0.0008% Rdg/°F

2.2.2 Temperature Effect on Zero: The temperature effect on zero shall not exceed +/- 0.0008% Rdg/°F.

2.2.3 Operating Temperature: Item shall operate in an ambient temperature of 67 to 79 degrees Fahrenheit without loss of required performance.

Rev 1

2.2.4 Operating Humidity: Item shall operate in an environment with 20 to 50% Relative Humidity without loss of required performance.

2.3 Electrical Requirements:

2.3.1 Rated Output: The rated output shall be 2 mv/v nominal

2.3.2 Excitation Voltage: The excitation voltage shall be 10 VDC.

2.4 Mechanical Requirements:

2.4.1 Safe Overload Range: The safe overload range shall be +/- 150% of rated capacity.

3.0 10k Load Cell PERFORMANCE REQUIREMENTS:

3.1 Accuracy Requirements:

3.1.1 Lower Load Limit: The 10k load cell shall meet ASTM E74 Class A lower load limit to 2% of range and Class AA lower load limit to 10% of range (When calibrated with primary standards)

3.1.2 Static Error Band: The Static Error Band shall not exceed +/- 0.030% of rated output.

3.1.3 Nonlinearity: The nonlinearity shall not exceed +/- 0.030% of rated output.

3.1.4 Hysteresis: The hysteresis shall not exceed +/- 0.040% of rated output.

3.1.5 Non-repeatability: The non-repeatability shall not exceed +/- 0.005% of rated output.

3.1.6 Creep: The error caused by creep shall not exceed +/- 0.006% in two minutes.

3.1.7 Drift: The drift shall not exceed 0.025% over a 12 month time frame.

3.1.8 Ascending Curve Standard Deviation: The standard deviation of the Ascending Curve shall not exceed 0.002% FS when used with the C3-100 Tovey Vertical Force Press and Tovey software.

3.1.9 Descending Curve Standard Deviation: The standard deviation of the Descending Curve shall not exceed 0.0015% FS when used with the C3-100 Tovey Vertical Force Press and Tovey software.

3.2 Temperature Requirements:

3.2.1 Temperature Effect on Sensitivity: The temperature effect on sensitivity shall not exceed +/- 0.0008% Rdg/°F

3.2.2 Temperature Effect on Zero: The temperature effect on zero shall not exceed +/- 0.0008% Rdg/°F.

Rev 1

3.2.3 Operating Temperature: Item shall operate in an ambient temperature of 67 to 79 degrees Fahrenheit without loss of required performance.

3.2.4 Operating Humidity: Item shall operate in an environment with 20 to 50% Relative Humidity without loss of required performance.

3.3 Electrical Requirements:

3.3.1 Rated Output: The rated output shall be 4 mv/v nominal

3.3.2 Excitation Voltage: The excitation voltage shall be 10 VDC.

3.4 Mechanical Requirements:

3.4.1 Safe Overload Range: The safe overload range shall be +/- 150% of rated capacity.

4.0 FUNCTIONAL REQUIREMENTS:

4.1 Compatibility: The load cells shall be compatible with the Tovey Engineering, Inc. P/N C3-100 Vertical Force Press and 9150 digital indicator.

4.2 Uncertainty: The uncertainty of the C3-100 Vertical Force Press shall not exceed 0.025% of reading when utilizing the load cells being provided.

5.0 PHYSICAL/MECHANICAL REQUIREMENTS: The equipment shall be constructed of materials that meet the requirements of this specification and in accordance with the best commercial practices for industry-approved equipment. It shall be designed and manufactured to maximize reliability, maintainability, accuracy of operation, and ease of operation. All parts such as shafts, bearings, regulators, switches, controls, etc., shall have proper clearance and adjustments. They shall work together so that the equipment will supply the rated requirements without unnecessary strains, vibrations, or overheating. They shall be able to withstand the conditions met in shipping, storage, installation, and service. All materials and parts of this equipment shall be capable of withstanding the environmental requirements of this specification.

5.1 Storage Box(s): A simple box shall be provided that will safely store each load cell while on a shelf or in a cabinet.

5.2 Load Cell Cable: Each load cell shall have an integrated 6-wire, 20 foot cable.

6.0 TESTING: The load cells shall be inspected and accepted at a destination specified elsewhere in this contract. The item will be checked with test equipment and parameters equal to or better than those required assuring specified performance requirements are met. Test equipment has first echelon certification directly traceable to the National Institute of Standards and Technology (NIST) or other AFMETCAL approved sources where required. Tests will be performed to assure the LPS meets or exceeds all of the requirements of this purchase description. Such testing does not relieve the contractor of performing all inspections and quality control checks at the point of fabrication as necessary to assure performance as specified.