Gemco 955A BRIK Instruction Manual

I

NSTALLATION

L

INEAR

D

ISPLACEMENT

MANUAL

T

RANSDUCERS

955A BRIK

GEN III Analog LDT

Series 956

955 Series

Includes 955A

Programming & Maintenance

Instructions Plus Accessory Guide

ABSOLUTE PROCESS CONTROL
KNOW WHERE YOU ARE... REGARDLESS

Introduction

The 955A BRIK Gen III is an accurate programmable, auto­tuning, 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.

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.

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.

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

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.