GSE 250 - Chapter 6: Approvals; Legal for Trade Modes; NTEP Requirements

Version 2.4 Page 45
Chapter 6: Approvals
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The Model 250 may be operated in Industrial, OIML or NTEP mode. (Note: For NSC
requirements, use the OIML setting.)
The industrial mode operates without an reference to trade regulations.
The OIML and NTEP modes restrict certain aspects of indicator operation to ensure compliance
with the respective trade certified standards. The following table lists the operation differences for
each of these modes.
Condition Industrial NTEP OIML
Underload –105% of full scale –1% or –2% of full scale depending
on zero range setting
–1% or –2% of full scale
depending on zero range setting
Overload 105% of full scale 105% of full scale Full scale +9 divisions
Tare No restrictions on Tare Tare values must be > 0 and
rounded to the nearest graduation
Tare values must be > 0
Test Modes Unlimited time allowed Limited to five seconds Limited to five seconds
The Model 250 factory default parameter setup does not ensure compliance with legal-for-trade
installations as mandated by local weights and measures authorities. This chapter contains
information on NTEP and OIML regulations, sealing and audit trails, and other requirements.
Since legal-for-trade requirements may vary, you must ensure that the Model 250 is installed in
accordance with all local regulations.
For details on parameter setup refer to the USE (Scale Use) section page 30.
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The National Type Evaluation Program (NTEP) is a widely accepted weights and measures
standard in the United States, with most states abiding by some or all of the NTEP requirements.
A complete list of these regulations is available in the "Handbook 44" publication distributed by
the National Institute of Standards and Technology (NIST). For more information, call (301) 975-
3058, or visit http://www.nist.gov
.
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The Model 250 NTEP Certificate of Conformance (C.O.C.) is 05-119A2.
In order to configure the Model 250 to comply with NTEP requirements, the OPTION:USE
parameter must be set to NTEP. This ensures the following:
• Serial data will not be received while in the Setup Mode.
• Received alpha characters will not be displayed.
• Numeric tare entries cannot be received through the serial port.
• Pressing [TARE] with a gross weight of zero (0) or keying in a tare value of zero (0) will not
automatically switch to the net mode.
• Negative tare values are not accepted.