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National Conference on Weights and Measures
15245 Shady Grove Road, Suite 130 Rockville, MD 20850

Certificate Number: 02-090
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National Type Evaluation Program
Certificate of Conformance
for Weighing and Measuring Devices

Indicating Element
Digital Electronic
Model: DWC-400-XY* (See Below)
nmax: 10 000 d

Accuracy Class: III/IIIL

Submitted by:
CompuWeigh Corporation
150 Commerce Court
Cheshire, CT 06410
Tel: (203) 699 9000
Fax: (203) 699 9488
Contact: Robin Sax

Standard Features and Options

* The model suffixes XY designate the following:
X = Enclosure type; 1= Desk top, 2= Upright, 3= Wall mount, 4= Panel mount
Y = Power input; A= 115 volts AC, B= 230 volts AC

Semi-automatic (push button) zero (SAZSM)
Automatic zero setting mechanism (AZSM)
Initial zero setting (only during calibration)
Keyboard Tare
Semi-Automatic (push button) tare
Programmable tare
Multiple tare memories
Remote printer capability
LCD Display
In/Out vehicle weighing
Configurable set points
Configurable Secondary & Tertiary weights
Operator prompted & Graphical Display
User programmable for non metrological functions
Separate Gross/Tare/Net Display
Gross/Net Display
Alphanumeric Display
lb/kg/g/oz/ton/metric ton unit’s capability
RS 232 communication port
RS 485 communication port
20 mA Loop connector
Linearity Calibration points
Variable print format
PC Keyboard
Password protection
Database memory
ROC Display
Configurable soft Keys

Multideck (Multichannel) Capability (up to 4 channels including summing of selected or all channels)

Temperature Range: -10°C to 40°C (14°F to 104°F)

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.

Effective Date: March 18, 1996


Ronald D. Murdock
Chairman, NCWM, Inc.


Louis E. Straub
Chairman, NCWM, Inc. Chairman, National Type Evaluation Program Committee
Issue date: June 27, 2002

Note: The National Conference on Weights and Measures 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.

Certificate Number: 96-036
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CompuWeigh Corp.
Model: DWC-400
Indicating Element

A general-purpose indicator to be interfaced with an approved compatible weighing element(s).

The capacity by division statement and, where applicable, the CLC will appear on an adhesive label on the front of the indicator. The other required information appears on an adhesive label on the back the indicator (except for the panel mount version. The label requirements will be placed adjacent to the weight display on the housing that surrounds the indicator).

The DWC-400 indicator model versions; “upright, desk top & wall mount” utilize a wire security seal threaded thru any two of the drilled head screws that hold a metal access plate located on the bottom of the indicator and a third larger drilled head screw that blocks the hole to the calibration switch.

The panel mount version: also utilizes a wire security seal that passes through a drilled head screw the holds the metal casing that surrounds the internal parts of the indicator and a larger drilled head screw that blocks the calibration switch located in the lower right corner on the back of the indicator.

Test Conditions:
This certificate is issued based upon the following tests and upon information provided by the manufacturer. A CompuWeigh DWC-400 indicator was submitted for evaluation. The emphasis of the evaluation was on the device design, marking requirements, operation and compliance with influence factor requirements. Several performance tests were conducted with the indicator (stainless steel housing) interfaced with a weighing element, 3 load cell simulators (multiple weighing elements) and a printer. The indicator was tested over a temperature range of -10°C to 40°C (14°F to 104°F). Additionally, tests were conducted using power supplies of 100 VAC / 130 VAC and 200 VAC to 250 VAC.

The results of the evaluation indicate the device complies with the applicable requirements of NIST Handbook 44.

Type Evaluation Criteria Used: NIST Handbook 44, 2001 Edition

Tested By: T. Lucas (OH)

Information Reviewed By: S. Patoray (NCWM), L. Bernetich (NCWM)