AMETEK 955S Smart Brik LDT - Manual (Page 2)

2 1080 N. Crooks Road • Clawson, MI 48017 • 800.635.0289 • 248.435.0700 • Fax 248.435.8120 • www.AMETEKAPT.com
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.
NOTE: If using the floating magnet option, you must
set the automatic gain control.
Ferro-magnetic material, (material readily magnetized)
should be placed no closer than .25” from the sensing
surface of the LDT.
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 Zone or Dead Band.
Yellow: Magnet is out of the programmed ZERO to SPAN
range.
Setting Zero & Span Positions
The Series 955S 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 1.5”
Dead area at the other end of the LDT that the magnet
must stay out of at all times. The diagnostic LED can
help 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)
NOTE 1: AGC should be set first before setting the
ZERO and SPAN positions when using a floating magnet.
NOTE 2: SPAN could also be set first, followed by setting
the ZERO position.
Introduction
The 955S Smart Brik 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 .01% 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 various outputs:
0 to 10 VDC
-10 to 10 VDC
0 to 5 VDC
-5 to 5 VDC
4 to 20mA
The 955S Smart Brik has a few truly unique features. The
first one being 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 the analog output is programmable over the entire
active stroke length. The active stroke area of the LDT lies
between the Null Zone and Dead Band.
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 To
0 to 10 VDC 10 to 0 VDC
-10 to 10 VDC 10 to -10 VDC
0 to 5 VDC 5 to 0 VDC
-5 to 5 VDC 5 to -5 VDC
4 to 20mA 20 to 4mA
NOTE 1: As an added benefit, the 955S is FM approved
for Class I, Div II, Groups A, B, C, D applications when
installed and wired per drawing E0241100.
NOTE 2: If your application does not require FM Class I,
Div II approval, wire the 955S using a standard 4 pin Euro
cordset from Ametek or others.