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Instrument Operation; Numbering System - GE Masoneilan 469 Series Instruction Manual

Position transmitter and limit switch
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1.

Instrument Operation

1.1 The 496-.58 and 496-.57 position
limit switch
Allow switching 1 or 2 electrical circuits. This function is
provided by 1 or 2 micro- switch(es) or 1 or 2 proximity
switch(es).
1.2 The 496-857 and 496-857/. and
496-858 or 496-858/. position
transmitter
The 496 Series instrument is a non-contact opto-
electronic positioner transmitter which provides a
4-20mA analog output signal proportional to the valve
position. This device can be mounted both on rotary
and reciprocating valves through a system of gears
and (for reciprocating valves only) a linkage.
The displacement of the stem or shaft is transmitted to
the opto-electronic sensor by 2 gears.
2.

Numbering System

496 - _
Type
1. One mechanical switch single
pole double throw
2. Two mechanical switches
single pole double throw
4. One proximity switch
5. Two proximity switches
6. One mechanical switch double
pole double throw
7. Two mechanical switches
double pole double throw
8. Optoelectronic position
transmitter
6 |
BHGE
The opto-electronic sensor has the same function than
a standard potentiometer and its output voltage is
proportional to the rotation of its axis.
An electronic circuit amplifies this voltage to a 4-20 mA
signal proportional to the angle of rotation.
This equipment has many advantages:
• non electrical noise typical of potentiometer
with cursor
• frictionless
• unlimited life
• non sensitive to vibration and electrical noise
• very low operating torque: 0.02 N.m
Optionally 496-857/. or 496-858/. apparatus can also be
used as a limit switch to switch 1 or several electrical
circuits. 1 or 2 micro- switch(es) or 1 or 2 proximity
switch(es) are provided for this supplementary function.
_ _
Protection
55. Weatherproof
57. Explosionproof and dust and
water tight
58. Intrinsically safe and dust and
water tight
/
Additional Function
for a Transmitter Only
1. One mechanical switch single
pole double throw
2. Two mechanical switches
single pole double throw
4. One proximity switch
5. Two proximity switches
6. One mechanical switch double
pole double throw
7. Two mechanical switches
double pole double throw
© 2018 Baker Hughes, a GE company. All rights reserved.
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