Introduction – Yokogawa 202 Field Mounting Rate Totalizer User Manual

Page 5

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1. INTRODUCTION

The Model 202A Rate-Totaliser is a microprocessor based instrument designed to
measure a 4-20mA signal from flowmeters and pressure transducers. The
instrument can be programmed to display directly in engineering units and
includes features such as linear or square law calculation, integration and digital
filtering.

Rate, Total and Accumulated Total can be displayed in engineering units on the
large LCD display. A front panel switch selects the function for display and a
Reset button allows the Total to be reset to zero.

The instrument is fully programmable, with all calculation constants set via the
front panel switches and stored in a non-volatile memory which will retain data
indefinitely. The user can program span, filtering levels, display resolution and
cutoff point.

The instrument is powered from a 4-20mA input signal and therefore, requires
no external power.

This instrument conforms to the EMC-Directive of the Council of European
Communities 89/336/EEC and the following standards:

Generic Emission Standard EN 50081-1

Residential, Commercial & Light
Industry Environment.

Generic Emission Standard EN 50081-2

Industrial Environment.

Generic Immunity Standard EN 50082-1

Residential, Commercial & Light
Industry Environment.

Generic Immunity Standard EN 50082-2

Industrial Environment.

In order to comply with these standards, the wiring instructions in Section 7.5
must be followed.

Introduction 3

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