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Led colors, Setting zero & span positions, Introduction – AMETEK 955A Brik LDT User Manual

Page 2: Mounting, Floating magnet assembly

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1080 N. Crooks Road • Clawson, MI 48017 • 800.635.0289 • 248.435.0700 • Fax 248.435.8120 • www.AMETEKAPT.com

LED Colors

Green: Magnet is present and within the active programmed

range.

Red: Fault, the LDT has lost its signal from the magnet

or the magnet has moved into the Null or Dead zone.

Yellow:

The magnet is out of the programmed ZERO to SPAN range.

Note 1: ZERO or SPAN can be adjusted individually

without setting the other.

Note 2: ZERO = 0V on 0 to 10 VDC

units and 4mA on 4 to 20mA units.

Setting Zero & Span Positions

The 955A is programmable over the entire active stroke length

of the LDT. Keep in mind that there is a 3” Null area at the

connector end of the LDT and a 2.0” Dead area at the other

end of the LDT that the magnet must stay out of at all times.

The diagnostic LED can aid you in the setup of the Zero and

Span. A green or yellow LED means that it is OK to program

the LDT in this area, a red LED means that the LDT cannot be

programmed in this area.

To set the ZERO and SPAN position for the probe

follow these steps.

1. Power up the probe in normal operating mode (i.e. “PRGM”

pin floating),

2. Place magnet assembly where ZERO is to be located, but

within the active region of probe,

3. Momentarily short “PRGM” pin (pin 2) to ground (pin 3),

4. Place magnet assembly where SPAN is to be located, but

within the active region of the probe,

5. Momentarily short “PRGM” pin (pin 2) to V+ (pin 1).

Wiring Diagram 955A Only

Euro Connector (Micro 12 mm single keyway)

Note: Refer to your specific model number and application

manual for the correct wire diagram and pin location.

Pin #

Wire Color

Function

1

Brown

Customer Supplied Power

(+VDC)

2

White

Program Input

3

Blue

Power Supply Common

4

Black

Position Output

5

Gray

Analog Output Common

Introduction

The

955A BRIK Gen III is an accurate programmable, auto-

tuning, non-contact, linear displacement transducer in an

economical, low profile package. The transducer utilizes our

field proven magnetostrictive technology to give absolute

position, repeatable to .006% of the programmable 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 an analog output. It can be ordered with a 0 to 10 VDC or 4

to 20mA output.

The

955A BRIK Gen III has a few truly unique features. One

feature is the LDT’s auto-tuning capability, the ability to sense

a magnet other than the standard slide magnet and adjust its

signal strength accordingly. Another feature is that the analog

output is programmable over the entire active stroke length. The

active stroke area of the LDT lies between the Null and Dead

zones.

There is a diagnostic LED located at the connector end of the

probe that remains green while a good magnet signal is present

and when the magnet is in the programmed stroke area. The

LED turns yellow when the magnet is out of the programmed

active range, but still within the active stroke area. The LED

turns red and the output goes to 0 volts on voltage output units,

or 4mA on current output units when there is no magnet present

or when the magnet is out of the sensing area. The unit can

easily be changed in the field from a 0 - 10VDC to a 10 - 0VDC

or 4 - 20mA to a 20 - 4mA .

Mounting

The transducer 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 between.

Ferro-magnetic material, which is material readily magnetized,

should be placed no closer than .25” from the sensing surface

of the LDT.

Floating Magnet Assembly

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.

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 have for the

improvement of this manual are welcomed. 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.