Instrument Operation; Numbering System - Baker Hughes Masoneilan 496 Series Instruction Manual

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). This device can
be mounted on both rotary and reciprocating
valves.
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 both mounted on rotary and
reciprocating valves.

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 | Baker Hughes
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, 496-8xx/x apparatus can be used
with additional functions as 1 or 2 micro-
switch(es) or 1 or 2 proximity switch(es). This is
also possible for type 496-1xx/x and type
496-2xx/x with the same type of switch.
_ _
Protection
55. Weatherproof
57. Explosionproof and dust
and water tight
58. Intrinsically safe and dust
and water tight
/
Additional Function
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
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