AMETEK 955D LDT User Manual

INSTALLATION MANUAL

L

INEAR

D

ISPLACEMENT

T

RANSDUCERS

955D BRIK

GEN III WITH DIGITAL OUTPUT

955 Series

Series 956

ABSOLUTE PROCESS CONTROL
KNOW WHERE YOU ARE... REGARDLESS

Includes 955D

Programming & Maintenance

Instructions Plus Accessory Guide

Preface

This manual is divided into three chapters. Chapter 1
provides the hardware overview for the 955D Linear
Displacement Transducers (LDT). Chapter 2 provides
instructions for installing the LDT to a mounting bracket.
Chapter 3 provides an overview and wiring instructions.
To further assist you, a glossary is provided at the back of
the manual.

!

CAUTION
Disconnect Power Before Servicing. The
Gemco 955D LDT Contains No Serviceable
Components. Consult Factory for Repair or
Replacement.

AMETEK Automation & Process Technologies has
checked the accuracy of this manual at the time it was
approved for printing. However, this manual may not
provide all possible ways of installing and maintaining
the LDT. Any errors found in this manual or additional
possibilities to the installation and maintenance of
the LDT will be added in subsequent editions. Any
comments you may have for the improvement of this
manual are welcomed.

U

Table of Contents

Chapter 1 Hardware Overview .........................3

Chapter 2 Installing the LDT ............................ 3

2.1 Mounting Instructions .............................3

2.2 Mounting the Magnet Assembly ............. 3

Chapter 3 955D Outputs ...................................5

3.1 CP (Control Pulse) .................................5

3.2 VP (Variable Pulse) ................................5

3.3 RS (Start/Stop) ....................................... 6

3.4 955D Wiring Connections ......................6

3.5 Features ........................ ........................7

3.6 Troubleshooting for 955D .......................8

3.7 Catalog Numbering System ...................9

3.8 Specifi cations for 955D .......................... 10

3.9 Accessories ............................................ 10

955D Glossary ...................................................11

AMETEK reserves the right to revise and redistribute
the entire contents or selected pages of this manual.
All rights to the contents of this manual are reserved
by AMETEK. The BRIK is a registered trademark of
AMETEK.

2

1080 N. Crooks Road • Clawson, MI 48017 • 800.635.0289 • 248.435.0700 • Fax [phone] • www.AMETEKAPT.com

Chapter 1 Hardware Overview

Chapter 2 Installing the LDT

Overview

The Series 955D BRIK with Digital Output is an
accurate, auto-tuning, non-contact, Linear Displacement
Transducer in an economical, low profi le package. The
transducer utilizes our fi eld proven magnetostrictive
technology to give absolute position, repeatable to .006%
of the sensing distance. The streamlined anodized
aluminum extrusion houses the sensing element and
electronics. The magnet moves over the sensing
element that determines the position and converts it to a
digital output.

Features

The 955D has a truly unique feature. This LDT has auto­tuning capability, the ability to sense a magnet other than
the standard slide magnet and adjust its signal strength
accordingly.

There is an indicator LED that is located at the connector
end of the probe and provides visual status information
regarding the operation of the probe. Green indicates
proper or normal operation. Red indicates the loss of the
magnetic signal or a probe failure. The LED turns Yellow
if no interrogation signal detected. When the probe is
in the normal mode of operation, the LED with remain
illuminated continuously.

LED Colors

Green Magnet is present and within the active range.
Red Fault, the LDT has lost its signal from the magnet or the

magnet has moved into the Null Zone or Dead Band.

Yellow No external interrogation pulse detected.

Note: The series number on your LDT is a record of all

the specifi c characteristics that make up your unit. This
includes what interface type it is, its output signal and
range, the type of connector the unit uses, and stroke
length. For a translation of the model number, see
Section 3.7 Catalog Numbering System.

The 955D BRIK with Digital Output is a Linear
Displacement Transducer. It provides a Control Pulse,
Start/Stop or Variable Pulse output signal that is
proportional to the position of the slide magnet assembly
along the length of the probe.

2.1 Mounting Instructions

The Series 955D can be mounted vertically or
horizontally using SD0522000 mounting brackets. The
mounting brackets slide in the grooves on the lower part
of the extrusion and clamp down when tightened. It is
recommended to use one mounting bracket on each end
and every three feet in between.

Ferro-magnetic material, (material readily magnetized)
should be placed no closer than .25” from the sensing
surface of the LDT.

2.2 Mounting the Magnet Assembly

Before mounting the magnet assembly, you should
consider the following

• Ferromagnetic material should not be placed closer
than 0.25” from the LDT’s sensing surface. Failure
to do so could cause erratic operation. Non-ferrous
materials, such as brass, copper, aluminum,
nonmagnetic stainless steel or plastics, can be
in direct contact with the magnet assembly and
sensing surface without producing any adverse
results.

• Make sure that the magnet is located within
the LDT’s active stroke area. Captive magnet
assemblies should be positioned so that they can
move freely over the entire area of the active stroke
without binding or pushing on the extrusion. Non­captive magnet assemblies should be situated so
that the magnet is no further than 3/8” from the
sensing surface at any point in the fl oating magnet
assembly’s movement.

• When using the Floating Magnet assembly
(SD0522100), the magnet should be installed within
3/8” of the sensing surface. The magnet assembly
should also be installed in such a manner that
it remains an even distance from the aluminum
extrusion throughout the entire stroke. Improperly
installed magnets can result in output signal non-

linearity.

1080 N. Crooks Road • Clawson, MI 48017 • 800.635.0289 • 248.435.0700 • Fax [phone] • www.AMETEKAPT.com

3

Dimension Drawing

Accessories

Item Part Number

Slide Magnet SD0521800
Float Magnet SD0522100
Mounting Foot SD0522000
6 Ft. Cable (6 Pin, Straight Micro Connector, Option E) 949021L6
12 Ft. Cable (6 Pin, Straight Micro Connector, Option E) 949021L12
6 Ft. Cable (6 Pin, Right Angle Micro Connector, Option E) 949022L6
12 Ft. Cable (6 Pin, Right Angle Straight Micro Connector, Option E) 949022L12

M5 X .56 DEEP
ALTERNATE MTG.

HOLE FOR LINKAGE

M5 X .40 DEEP

LINKAGE MTG. HOLE

.28

2.06

1.19

.55

.40

Mounting Brackets (SD0522000)

A standard female swivel
mounting arm is provided
with the slide magnet
assembly. For extensions
and other options contact
AMETEK at 800-635-0289.

slide in the grooves on the side
of the extruded housing. When
tightened down with fastening
hardware the mounting bracket
clamps the unit into place. It is
recommended to use one mounting
bracket on each end and every
three feet between.

.60

.22 MTG. HOLES

2 PER MTG. FOOT

.36

.30

1.97

2.68

1.37

NULL

LED

1.80
.92

.82

.30

1.00

1.50

.08

.87

.28

.56

R.89

360 ROTATION

DEAD

DEAD

BAND

ZONE

SLIDE MAGNET ASSEMBLY
P/N SD0521800

.25



OF MAGNET SLUG



1.30

1.37

1.04

.36 .98

.68

.08

.28

.69

1.50

.87

.56

6 Pin,12 mm EURO
MALE CONNECTOR

R.87

360 ROTATION

.25 TO CENTERLINE

OF MAGNET SENSOR

.10

.42

FLOATING MAGNET ASSEMBLY
P/N SD0522100

.50

TO CENTERLINE

.75

.34

1.00

OF MAGNET

.34

L = NULL +

1.31

2.00

1.31

STROKE + DEAD ZONE

DEAD BAND

.25

.20 THRU

.359 C’BORE
.21 DEEP
OTHER END
2 PLACES

.20 THRU
2 PLACES

.50

Note: The North Pole of the magnet
should be pointed towards the probe.

4

1080 N. Crooks Road • Clawson, MI 48017 • 800.635.0289 • 248.435.0700 • Fax [phone] • www.AMETEKAPT.com