Metrix SA6350 User manual

Doc# M9192 • REV K (November 2020) Page 1 of 4
SA6350 HIGH-TEMPERATURE ACCELEROMETER
Installaon Manual
OVERVIEW
The Metrix SA6350 is suitable for use in
temperatures up to 325oC. The sensor’s
design separates the charge amplier/
line driver from the piezo-electric sens-
ing element, using an armored, integral
cable. This allows the sensing element to
be mounted directly on the machine, but
the charge amplier to be mounted either
3m or 5m away, in a lower-temperature
environment. The charge amplier is rated
up to 120oC; its mounng locaon will oen
expose it to moderately elevated tempera-
tures, but these will normally be well below
the surface temperatures encountered at
the sensing element locaon, such as a gas
turbine casing. The charge amplier can
then be connected to standard eld wiring
via its 2-pin MIL-style connector or oponal
integral shielded cable.
0598

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MECHANICAL INSTALLATION
Accelerometer and Cable Installaon
The sensive axis of the accelerometer can be mounted on any radial axis. When possible,
to reduce temperature exposure as much as praccal, mount the accelerometer on the side
of the machine. To ensure a clean response to high frequency vibraons, the accelerometer
must be securely mounted to a at machined surface. If a bracket is required, it should be
rigidly constructed to prevent spurious mechanical resonances in the specied frequency
range. Due to the accelerometer cable temperature limitaon of 260°C, the cable MUST be
routed away from surfaces exceeding that temperature. To avoid cable noise, the accelerom-
eter cable must be rmly secured every .3m (12 inches) to minimize cable movement. The
minimum bending radius of the cable is 30 mm (1.2 inches). Please note that the armored
cable between the accelerometer and the charge amplier module is not removable in the
eld. DO NOT ATTEMPT TO DISCONNECT THE ARMORED CABLE.
Charge Amplier
The charge amplier module can be mounted in any convenient locaon relave to the
accelerometer. Ensure that the maximum temperature the module is exposed to is within
the limits specied (-40°C to +58°C/120°C). The module should be fastened to a supporng
structure using customer supplied clamps or straps.
ELECTRICAL INSTALLATION
Accelerometer Grounding
Most machinery trains are grounded to earth. An accelerometer mounted on such a ma-
chine would then also be grounded. In some circumstances, electrical noise on the machine
housing may be transferred to the accelerometer. In these cases, it may be necessary to
provide an addional electrical ground connecon to the plant instrument ground system.
In extreme cases, it may be necessary to electrically isolate the accelerometer from the
machine housing and connect only the accelerometer to the instrument ground system. The
laer case requires precauons in order to maintain a proper mechanical mounng of the
accelerometer without introducing mechanical resonances.
Charge Amplier / Line Driver Wiring
The Charge Amplier / Line Driver module is provided in output connector, terminal block
and integral shielded cable versions. Connecon to the module should be made with a
shielded, twisted-pair cable suitably rated for the environmental condions to be expected.
The maximum wire size which may be used with the connector or terminal block is number
16 AWG (1.26 sq. mm). The cable shield is le oang at the Charge Amplier / Line Driver
end of the cable. The integral cable version of the Charge Amplier / Line Driver is provided
with number 20 AWG wires.
Metrix has connector versions of cables (20 AWG) available for use with the Charge Amplier
/ Line Driver. Metrix P/N 9193-001 is to be used with the 58°C version of the Charge Ampli-
er / Line Driver and Metrix P/N 9193-002 is to be used with the 120°C version.
The shield at the far end of the output cable should be connected to the receiving monitor’s,
transmier’s, or PLC’s circuit common. In addion, it may be necessary to connect that point
to a low noise electrical ground system. The cable shield should be connued to within 25mm
(1 inch) of the receiver’s terminals and the shield connecon should be as short as possible.

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A praccal limit on the cable length in voltage mode is 300 meters (1000 feet) based on a
cable capacitance of 100 pF per meter (30 pF per foot). The cable forms a low pass lter.
Long cables will aenuate the higher frequency components of vibraon signals more than
short cables. Consult the factory for addional informaon if this is of concern.
MOUNTING PATTERNS
Sensor Base “A”
MOUNTING SPECIFICATIONS
(inches)
Spot face Ø1.75”,
Drill Ø.106” (No. 36) x .62” DP.
C’bore 90° x Ø.14”
Tap 6-32 UNC x .50” DP.
MOUNTING SPECIFICATIONS
(mm)
Spot face Ø45mm,
Drill Ø2.90mm x 16mm DP.
C’bore 90° x Ø3.5mm
Tap M3.5 x .60 x 12mm DP.
Connector “C”

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NOTES:
1. This apparatus cannot be repaired in the eld and must be replaced by an equivalent
unit.
2. This apparatus has been designed such that it does not give rise to physical injury or
other harm due to contact, nor does it produce excessive surface temperature, infrared,
electromagnec or ionizing radiaon. It also does not have non-electrical dangers.
3. Do not separate or disconnect unit when energized when used in a Zone 2 Area.
This electronic equipment was manufactured according to high quality stan-
dards to ensure safe and reliable operaon when used as intended. Due to its
nature, this equipment may contain small quanes of substances known to be
hazardous to the environment or to human health if released into the environ-
ment. For this reason, Waste Electrical and Electronic Equipment (commonly
known as WEEE) should never be disposed of in the public waste stream. The
“Crossed-Out Waste Bin” label axed to this product is a reminder to dispose
of this product in accordance with local WEEE regulaons. If you have ques-
ons about the disposal process, please contact Metrix Customer Services.
ENVIRONMENTAL INFORMATION
info@metrixvibraon.com
www.metrixvibraon.com
8824 Fallbrook Dr. Houston, TX 77064, USA
Tel: [phone] • Fax: [phone]
Aer Hours (CST) Technical Assistance: 1.713.452.9703