Emerson MSP422 Manuel d'utilisateur télécharger pdf (Page 9)

Reference Manual

IP2013, Rev BA

February 2012

Mobrey MSP422

www.mobrey.com

Section 2 Transmitter Overview

Theory of Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 2-1

Components of the Transmitter . . . . . . . . . . . . . . . . . . . . page 2-2

THEORY OF OPERATION The Mobrey MSP422 ultrasonic level transmitter is designed to be mounted

above a liquid and uses ultrasonic pulses to continuously measure the

distance to the liquid surface. The microprocessor-controlled electronics

measures the time delay between the transmitting and the receiving of the

reflected signals to calculate the distance (Figure 2-1).

When programmed with the bottom reference of the application – usually the

bottom of a tank – the MSP422 computes the liquid depth (level) and outputs

a 4–20 mA signal proportional to that level.

An LCD screen inside the enclosure displays the selected measurement.

Programming of the MSP422 is achieved using the integral push-buttons

inside the enclosure and the menu system shown on the LCD screen.

The MSP422 may be mounted in a non-hazardous areas only.

Figure 2-1. Typical Application

Using a Mobrey MSP422

Transmitter

Distance

Level

Bottom Reference

1 2 3 4 5 6 7 8 9 10 11 12 13 14 ... 39 40

Pas de commentaire

Emerson MSP422 Manuel d'utilisateur Page 9