ISA-SP74, Continuous Weighing Instrumentation

Scope

Purpose

The intent of this document is to standardize nomenclature, establish design criteria conducive to simplified specification, provide uniformity of installation, calibration, and maintenance procedures as they concern belt type weighing devices, with particular attention to:

1. Length for weight bridge and number of idlers
2. Spacing of approach and retreat idlers
3. Inclination and location of weight bridge
4. Types of belts
5. Degree of troughing
6. Feed point and impact guarding
7. Speed pick-up and/or control
8. Strain and tension
9. Ambient temperature and wind load affect
10. Associated instrumentation
11. Calibration requirements/procedures/frequency
12. Recommended maintenance practices

Weighing devices may be mechanical, pneumatic, hydraulic, electronic, or radiation type.

Length of transmitting signals, signal levels, remote controls, and so forth are included by reference to other existing ISA standards.

A Word from the Chairman

There is no activity in this committee at this time.

Paul Chase Voting Member Chase Technology Inc Phone: (612) 427-2356 Fax: (612) 427-4864	Mark Coppler Voting Member Managing Director Ametek Inc Phone: (412) 826-2431 Fax: (412) 826-0686
Lois Ferson Information Member ISA Phone: (919) 990-9227 Fax: (919) 549-8288	David Howat Information Member PT Freeport Indonesia Tpra Phone: +62-901-418304
G. Kachel Voting Member Riede Systems Inc	Gordon McFarland Voting Member Emerson Process Mgmnt Power & Water Sol Phone: (706) 484-0570 Fax: (706) 484-0955
Ian Verhappen Information Member Industrial Automation Networks Inc Phone: (780) 842-4722 Fax: (780) 628-7352