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National Conference on Weights and Measures
1135 M Street, Suite 110, Lincoln, Nebraska 68508
Certificate Number: 02-059A3
Page 1 of 3
National Type Evaluation Program
Certificate of Conformance
for Weighing and Measuring Devices
Load Cell Electronic
Model: CWC Series
Capacity: 500 lb to 60 000 lb
nmax: See Table on Page 2
emin: See Table on Page 2
Accuracy Class: III/IIIL
CompuWeigh Corporation
50 Middle Quarter Rd.
Woodbury, CT 06798
Tel: (203) 262-9400
Fax: (203) 262-9488
Contact: Hal Ecke
Email: hal@compuweigh.com
Website: www.compuweigh.com
Standard Features and Options:
Temperature Range: -10°C to 40°C (14°F to 104°F)
Primary weight indications, motion detection and bulk weighing requirements are provided by the compatible and certified controller.
Controller: CompuWeigh Corporation, Model DWC-300 (Certificate of Conformance Number 00-007)
CompuWeigh Corporation, Model CD-4000 (Certificate of Conformance Number 01-041)
Weighing Element/Hopper Scale: Mild steel construction three load cell design. Capacity and dimension (see page 2)
Load Cells:
Flintec, Inc., Model SLB (Certificate of Conformance Number 97-061A1);
Artech Industries, Model 20210 (Certificate of Conformance Number 87-057A4);
Or other NTEP Certified and compatible load cells.
This device was evaluated under the National Type Evaluation Program (NTEP) and was found to comply with the applicable technical requirements of Handbook 44, Specifications, Tolerances, and Other Technical Requirements for Weighing and Measuring Devices. Evaluation results and device characteristics necessary for inspection and use in commerce are on the following pages.
Ronald Hayes
Chairman, NCWM, Inc.
John Gaccione
Committee Chair, NTEP Committee
Issued Date: September 29, 2014
Note: The National Conference on Weights and Measures (NCWM) does not approve, recommend, or endorse any proprietary product or material, either as a single item or as a class or group. Results shall not be used in advertising or sales promotion to indicate explicit or implicit endorsement of the product or material by the NCWM.
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Certificate Number: 02-059A3
Page 2 of 3
CompuWeigh Corporation
Hopper Scale/CWC Series
Application: General purpose weighing element that may be used for bulk weighing applications, including grain, when interfaced with a compatible and NTEP certified indicator/controller.
Identification: The required information is on a plate riveted to the side of the device.
Sealing: The junction box has no provisions for sealing. The parameters are adjusted and sealed at the indicator.
| Model | Capacity (lb) | emin | nmax | Working Volume (cu ft) | Width (inches) “S” | Diameter (inches) “R” | Cross Section (sq ft) | Height (inches) | Max Dist between Load Cells (inches) |
| CWC-10 | 500 | 0.2 | 2500 | 10.4 | 30 | 34 | 6.3 | 30 | 33 |
| CWC-15 | 750 | 0.2 | 3750 | 15.6 | 36 | 41 | 9 | 26 | 40 |
| CWC-20 | 1000 | 0.2 | 5000 | 20.8 | 36 | 41 | 9 | 38 | 40 |
| CWC-30* | 1200 | 0.2 | 6000 | 25.0 | 60 | 60 | 22.3 | 35 | 59 |
| CWC-40 | 1500 | 0.5 | 3000 | 31.3 | 60 | 60 | 22.3 | 39 | 59 |
| CWC-046 | 2 000 | 1 | 2000 | 42 | 56 | 64 | 22 | 40 | 65 |
| CWC-056 | 3 000 | 1 | 3000 | 63 | 56 | 64 | 22 | 50 | 65 |
| CWC-076 | 4 000 | 1 | 4000 | 83 | 56 | 64 | 22 | 61 | 65 |
| CWC-108* | 5 000 | 1 | 5000 | 104 | 80 | 90 | 45 | 49 | 92 |
| CWC-158 | 6 000 | 2 | 3000 | 125 | 80 | 90 | 45 | 53 | 92 |
| CWC-208 | 10 000 | 5 | 2000 | 210 | 80 | 90 | 45 | 77 | 92 |
| CWC-310 | 15 000 | 5 | 3000 | 315 | 104 | 117 | 75 | 79 | 110 |
| CWC-410 | 20 000 | 5 | 4000 | 420 | 104 | 117 | 75 | 93 | 110 |
| CWC-510 | 25 000 | 5 | 5000 | 520 | 104 | 117 | 75 | 108 | 110 |
| CWC-512* | 25 000 | 5 | 5000 | 520 | 128 | 144 | 114 | 88 | 134 |
| CWC-612 | 30 000 | 10 | 3000 | 625 | 128 | 144 | 114 | 97 | 134 |
| CWC-712 | 42 000 | 10 | 4200 | 875 | 128 | 144 | 114 | 118 | 134 |
| CWC-814* | 48 000 | 10 | 4800 | 1000 | 140 | 158 | 136 | 108 | 155 |
| CWC-914 | 54 000 | 20 | 2700 | 1125 | 140 | 158 | 136 | 119 | 155 |
| CWC-1014 | 58 000 | 20 | 2900 | 1200 | 140 | 158 | 136 | 130 | 155 |
| CWC-1114 | 60 000 | 20 | 3000 | 1250 | 140 | 158 | 136 | 140 | 155 |
* Models tested
Designates square construction and designates a round construction hopper scale design.
Certificate Number: 02-059A3
Page 3 of 3
CompuWeigh Corporation
Hopper Scale / CWC Series
Test Conditions : This certificate supersedes NTEP Certificate of Conformance 02-059A2 and is issued to include additional capacities and certificate parameters. The Model CWC-814 was submitted and was interfaced with a CompuWeigh Corporation controller, Model CD-4000 (NTEP CC 01-041). The emphasis of the evaluation was on the design and performance of the receiving/weighing element. The CompuWeigh Corporation controller, Model CD-4000 allowed it to function as a bulk weighing system. Several increasing/decreasing load, discrimination, and return to zero tests were conducted using 12 000 lbs of known test weights. A build up test was conducted by raising and lowing test weights using the substitution test method to a capacity of 47 700 lbs. The weigh hopper can be filled and emptied by opening and closing the upper garner and weigh hopper gates. Weight values can be printed any time during a test. Previous test conditions are below for reference.
Certificate of Conformance 02-059A2: This certificate supersedes NTEP Certificate of Conformance 02-059 and is issued to include additional capacities. The Model CWC-30S was submitted for evaluation. The emphasis of the evaluation was on device design, marking, and the hopper scale performance and operation including interaction with a bulk weighing system controller. The hopper scale was tested interfaced to a CompuWeigh Corporation, Model DWC-300 controller (Certificate of Conformance Number 00-007) and a GSE-460 indicating element (Certificate of Conformance Number 01-031). Several increasing/decreasing load tests were conducted using 1 200 lbs of certified weights. Additionally, discrimination and “return to no-load†tests were conducted. The device was retested in the same manner 30 days later after more than 300 weighments. Previous test conditions are below for reference.
Certificate of Conformance 02-059A1:
This certificate supersedes NTEP Certificate of Conformance 02-059 and is issued to include additional capacities. The Model CWC-30S was submitted for evaluation. The emphasis of the evaluation was on device design, marking, and the hopper scale performance and operation including interaction with a bulk weighing system controller. The hopper scale was tested interfaced to a CompuWeigh Corporation, Model DWC-300 controller (Certificate of Conformance Number 00-007) and a GSE-460 indicating element (Certificate of Conformance Number 01-031). Several increasing/decreasing load tests were conducted using 1200 lb of certified weights. Additionally, discrimination and “return to no-load” tests were conducted. The device was retested in the same manner 30 days later after more than 300 weighments.
Certificate of Conformance 02-059:
The Model CWC-512R was interfaced with a CompuWeigh Corporation controller, Model CD-4000. The emphasis of the evaluation was on the design and performance of the receiving/weighing element. The GSE indicator (Certificate of Conformance Number 01-031) and the CompuWeigh Corporation controller, Model CD-4000 (Certificate of Conformance Number 01-041) allowed it to function as a bulk weighing system. Several increasing/decreasing load, discrimination, and return to zero tests were conducted using 6600 lb of known test weights. A build up test was conducted by raising and lowing test weights. The weigh hopper can be filled and emptied by opening and closing the upper garner and weigh hopper gates. Weight values can be printed any time during a test. A permanence test was conducted consisting of several increasing/decreasing load, discrimination, and return to zero tests. The results of all tests were within acceptance tolerances.
Evaluated By: Charles Stutsman (KS) 02-059; S. Boyd (CA), 02-059A1; Terry Davis (KS) 02-059A2; Darrell Flocken (NCWM) 02-059A3
Type Evaluation Criteria Used: NIST Handbook 44 Specifications, Tolerances, and Other Technical Requirements for Weighing and Measuring Devices, 2014 Edition. NCWM Publication 14 Weighing Devices, 2014 Edition.
Conclusion: The results of the evaluations and information provided by the manufacturer indicate the devices comply with applicable requirements.
Information Reviewed By: S. Patoray (NCWM), L. Bernetich (NCWM) 02-059, 02-059A1, 02-059A2; J. Truex (NCWM) 02-059A3