Metrix ST5484E User manual
ST5484E 2-WIRE SEISMIC VIBRATION TRANSMITTER
Installaon Manual
DOC# M9162 • REV AB (April 2019)
1. OVERVIEW
The ST5484E Seismic Vibraon Transmit-
ter combines a vibraon sensor and signal
condioner in a single package for sensing
machinery vibraon level and transming a
proporonal 4-20 mA signal directly to PLCs,
DCSs, monitors, and computers. Versions
with 2 wires, 4 wires, terminal blocks, or
MIL-type connector are available.
The transmier has no moving parts and is
encapsulated in a stainless steel housing.
Each transmier is factory calibrated to the
sensivity marked on the label. An oponal
dynamic signal output can be specied.
Refer to Metrix Datasheet 1004457 for
specicaons, ordering informaon, and
outline dimensions.
2. MOUNTING
It is important to solidly mount the transmit-
ter body to the machine surface. Refer to
secon 6 on transducer placement. Dier-
ent machine preparaons are required for
the two basic transmier mounng styles;
NPT (Naonal Pipe Thread) and machine
thread (UNF and Metric). Transmiers with
the NPT type mounng stud are secured by
the thread engagement and the base of the
transmier does not contact the machine
surface. Transmiers with the machine
thread studs must contact the machine
surface. The base of the transmier must
make square and direct contact. This re-
quires preparing the surface of the machine
with a 1 1/2 inch counter bore (surfacing
tool). This tool can be used with a portable
1180
Flying Leads
2-Pin Terminal Block
4-Pin Terminal Block
2-Pin MIL Connector
Doc# M9162• REV AB (April 2019) Page 2 of 12
drill equipped with a magnec base but care must be taken so that the tapped and threaded
hole is perpendicular to the machined surface. The transmier must make contact all the way
around its base surface. Contact Metrix for more detailed counter bore instrucons.
If installing a transmier with a standard 1/4 inch NPT stud, drill a hole using a 7/16 inch bit, 5/8-
7/8 inch deep. Then tap using a 1/4 - 18 NPT (tapered pipe tap). Hand-ghten the transmier
and then turn an addional 1 to 2 turns using a wrench on the wrench ats. Do not use a pipe
wrench. A pipe wrench can apply extreme forces to the body and potenally damage electronic
components. A minimum of ve (5) threads of engagement should be made. A 1/4 inch to 1/2
inch NPT bushing is available for mounng the transmier in exisng 1/2 inch NPT holes. Also,
a Metrix model 7084 Flange Adapter can be used between the transmier and the machine
surface when there is not enough surface thickness to drill and tap a hole. The ange adaptor
mounts with three small screws.
If installing a transmier with one of the straight machined thread sizes, follow standard drill and
tap procedures. Do not drill a hole larger that the counter bore pilot diameter before using the
counter bore to prepare the machine surface. Drill out the hole with the correct tap drill size
aer preparing the surface.
The sensive axis of the transmier is in line with the mounng stud. The transmier can be
oriented in any (0 to 360 degree) posion.
3. WIRING
3.1 General
The ST5484E is connected like other loop powered transmiers. The following is a summary
based on area designaons.
Connect the eld wiring in accordance with the appropriate poron of Figure 1.
The ST5484E terminal block opon must be used with the following conductors specicaon:
• 14-24 AWG solid copper conductors OR
• 20-26 AWG stranded copper conductors
The ST5484E transmier requires a minimum of 11 VDC for proper operaon. This is the mini-
mum voltage required at the transmier (not the power supply), aer all other voltage drops
across eld wiring and receiver input impedance have been accounted for with the maximum
20mA of loop current owing. The minimum loop power supply voltage required is therefore 11
VDC plus 1 volt for each 50 W of total loop resistance.
Figure 1: Single-transmier loops Mulple-transmier loops
CAUTION: Use of a high-speed torque screw-
driver may damage the terminal blocks.
Doc# M9162• REV AB (April 2019) Page 3 of 12
Example:
Component Resistance
Signal wiring 10 W
DC Input Impedance of receiver 250 W
TOTAL LOOP RESISTANCE 260 W
Minimum supply voltage = 260 W (1 V/50 W) + 11 V = 16.2 VDC
The maximum loop power supply voltage that may be applied is 29.6 VDC (intrinsically safe)
or 30VDC (explosion proof and non-incendive). The maximum loop resistance (RL) is calcu-
lated by the equaon: RL = 50 (VS - 11) W
Example: RL = 50 (24 - 11) = 650 W for a 24 VDC loop supply.
3.2 Intrinsically Safe Installaon In Hazardous Locaons
Connect the eld wiring in accordance with Metrix drawing 9426 for CSA Class I, (A,B,C &
D) and Metrix drawing 9278 for IECEx / ATEX (Ex ia IIC T4 Ga) approvals. The leads must be
terminated inside an enclosure with a degree of protecon of at least IP20. A Metrix elbow
from the 8200 series may be used for these purposes. Refer to Metrix Datasheet 1004457
for addional details on accessories. The ambient temperature range is -40°C to 100°C.
The transmier requires a minimum of 11 VDC for proper operaon. The voltage drop
across the specied non-isolated barriers with a 20 mA loop current is 8.1 VDC. As such, The
minimum loop power supply voltage required is 19.1 VDC plus 1 volt for each 50 W of loop
resistance. The maximum loop power supply voltage that may be applied to the safety bar-
rier is 26 VDC. Therefore, the maximum loop resistance with a 26 VDC supply is 345 W.
Example:
Component Resistance
Signal wiring 5 W
DC Input Impedance of receiver 100 W
TOTAL LOOP RESISTANCE 105 W
Minimum supply voltage = 105 (1 V/50 W) + 19.1 V = 21.2 VDC
3.3 Explosion-Proof Installaon In Hazardous Locaons (CSA)
Some models of ST5484E transmiers are CSA cered explosion-proof, CSA US/C, Class I,
Div 1, Grps B-D and Class II, Div 1, Grps E-G (explosion proof). Connect the eld wiring in ac-
cordance with the appropriate poron of Figure 1. Refer to secon 3.1 for loop voltage and
resistance requirements. All conduit and juncon boxes used must be cered explosion-
proof for the class, division, and group required by the applicaon. Installaon of the trans-
mier must meet all of the explosion-proof installaon requirements of the local governing
agency and facility safety procedures.
3.4 Flame-Proof Installaon In Hazardous Locaons (ATEX, IECEX)
Some models of ST5484E transmiers are ATEX/IECEx cered ame-proof, Ex d IIC T4 Gb. Con-
nect the eld wiring in accordance with the appropriate poron of Figure 1. Refer to secon
3.1 for loop voltage and resistance requirements. All conduit and juncon boxes used must be
cered ame-proof for the area required by the applicaon. Installaon of the transmier
must meet all of the ame-proof requirements of the local governing agency and facility safety
procedures. The Metrix part 8200-001-IEC elbow is required to meet this approval.
Doc# M9162• REV AB (April 2019) Page 4 of 12
Doc# M9162• REV AB (April 2019) Page 5 of 12
Doc# M9162• REV AB (April 2019) Page 6 of 12
WARNING:
CSA Equipment Installaon Requirement per ordinary locaons standards,
C22.2/UL 61010-1:
Applicable for permanently connected equipment:
a) A switch or circuit-breaker must be included in the installaon;
b) It must be suitably located and easily reached;
c) It must be marked as the disconnecng device for the equipment.
Equipment environmental Rangs:
a) Polluon degree 3
b) Installaon category I
c) Altude 2000m
d) Outdoor: Type 4x
e) Temperature -40°C to 100°C
4. ELECTROMAGNETIC COMPATIBILITY
In order to meet the requirements of electromagnec compability in areas of high electro-
magnec interference, the eld wiring must be:
• Shielded twisted pair cable enclosed in grounded metallic conduit, or
• Double shielded twisted pair cable with a metallic body cable gland ng and with the
outer shield grounded.
Use standard two-conductor, twisted pair, shielded wiring for the long run to the instrumen-
taon enclosure. The transmier is connected like other loop-powered end devices.
WARNING:
ATEX Condions for Safe Use (Ex d)
For temperature classicaon and safety:
• Use conduit elbow, Metrix reference 8200-001-IEC, which is a Killark product with
reference: Y-3-EX.
• Ambient Operang Temperature: -40°C to +100°C
NOTE: Metrix also strongly recommends the use of our ferrite bead kit (Metrix
p/n 100458) as an extra precauon against electromagnec interference that may
be induced in eld wiring from subsequently bleeding into the transmier.
WARNING:
ATEX Condions for Safe Use (Ex ia)
The ST5484E is intrinsically safe and can be used in potenally explosive atmo-
spheres. This transmier must only be associated to intrinsically safe cered appara-
tus, and this combinaon must be compable as regards intrinsic safety.
The electrical parameters of cered equipment connected to the transmier must
meet the following criteria:
Uo ≤ 29.6 VDC, Io ≤ 100mA; Po ≤ 0.75W
Ambient operang temperature -40oC to +100oC
Doc# M9162• REV AB (April 2019) Page 7 of 12
5. CONNECTION TO PLC OR OTHER INDICATING INSTRUMENT
The rst step in conguring the PLC, DCS, or other recording instrument is to determine the source
of power. The ST5484E requires loop power. Some analog input channels on a PLC or DCS, for
example, provide this power from within. If they do not provide power, an external power supply
must be provided. Connect the transmier eld wiring using standard instrumentaon pracces.
Scaling of the display is on the basis of the range of the transmier. The measurement parameter
name is “vibraon” and the units are “in/s” (inches per second) or “mm/s” (millimeters per sec-
ond). The example below is based on a standard 1.0 in/s transmier.
6. TYPICAL TRANSMITTER PLACEMENT
The ST5484E measures seismic vibraon (i.e., vibraon velocity) at the aachment point on the
machine, using engineering units of in/s (inches per second) or mm/s (millimeters per second)
depending on the selected ordering opon. The transmier’s sensive direcon is through the long
axis of its cylindrical body. It will not measure side-to-side moon.
Typical transmier mounng for casing vibraon measure-
ments is in the horizontal direcon at the bearing housings
as depicted in Figure 2. The horizontal direcon usually
incurs more vibraon because most machines’ foundaon
constrains vercal vibraon more than horizontal vibraon.
A horizontal mounng arrangement is also depicted in Figure
3, but with addional detail showing typical accessories.
When ying leads are ordered, a 24- or 72-inch length may
be specied using ordering opon D on the Metrix product
datasheet 1004457. These leads may be cut to length and
then spliced to eld wiring as shown in Figure 3. Figure 2
Typical transmier
mounng
When vibraon level
at transmier is…
Transmier output
will be…
PLC (or other) should read…
0.0 in/s (i.e. no vibraon) 4.0 mA (± 0.1 mA) 0.00 in/sec
1.0 in/s (i.e. full scale vibraon) 20.0 mA (± 0.5 mA) 1.00 in/sec
Momentary “jolts” that can occur at start-up, or during some operang condion changes, do not
reect a machine’s steady-state operang condion. To prevent such occurrences from generang
nuisance alarms, program a me delay into the alarm such that the indicated vibraon level must
persist above the alarm setpoint for a preset period of me before an alarm is generated. The
indicated vibraon level must cross the threshold level and stay above it for a preset me before
any alarm acon is taken. A 2- to 3-second delay is normally applied to most machinery. Consult
Metrix if you have a queson about your machine’s operang characteriscs.
Some rough starng machinery may also need a start-up me lockout for alarms. A start-up
lockout is dierent than a me delay. A start-up lockout funcons the same as a me delay, but is
usually set to a much longer me. Both may be needed.
Doc# M9162• REV AB (April 2019) Page 8 of 12
Figure 3
When aaching conduit to the transmier, observe the following:
• Because the transmier is sensive to vibraon, avoid unsupported lengths of conduit and
excessive mass (such as large hubs or juncons) hanging directly o the end of the transmier.
These can introduce unwanted vibraons that do not reect actual machinery vibraon and
cause mechanical stresses that can lead to premature transducer failure.
• A “Y” type conduit elbow, such as the Metrix 8200 series, is preferred because it prevents the
conduit from extending too far away from the transmier, thus liming the likelihood of break-
age. It also precludes long unsupported lengths of conduit directly aligned with the transmit-
ter’s bore (longitudinal axis) as noted in the bullet above.
• Avoid aachment of rigid conduit directly to the transmier; instead, use a small length of
exible conduit to mechanically isolate the transmier from vibraon that might occur in rigid
conduit.
• If a 1-inch to 3/4-inch reducer is used at the elbow, a smaller diameter exible conduit can be
used.
NOTE: Hazardous area locaons do not allow a splice at the locaon shown
in Figure 3. Instead, the splice must be made in a second conduit hub
(meeng splicing requirements) located at the end of exible conduit.
Doc# M9162• REV AB (April 2019) Page 9 of 12
7. INSTALLATION BEST PRACTICES FOR RFI IMMUNITY
The ST5484E is case isolated from the loop power connecon to the
PLC, DCS, SCADA, or other +24 VDC alarm system. With the correct
grounding scheme, this type of isolaon avoids ground loops and re-
sults in good RF immunity. However, in situaons which involve inter-
ference from high-powered transmiers and especially spread-spec-
trum type radios, the ST5484E may become vulnerable to RF noise.
Since it is oen dicult to idenfy these situaons in advance, Metrix
strongly recommends ulizing the following Best Pracces when install-
ing all ST5484E transmiers in the eld:
1. Twist the sensor leads together (at least 10 twists per foot).
2. Slide the twisted leads through the included ferrite core and posi-
on as close to the sensor as praccal. Refer to Figures 4 and 5.
3. If possible, cut the leads short and use a shielded twisted pair. Fol-
low step 2 in this applicaon as well.
As shown in Figure 5, “chokes” that aenuate dierent frequencies can
be created by looping a dierent number of turns through the ferrite
core. More wire turns adds more inductance, aenuang progressively
lower frequencies. Mulple “chokes” can be created in this manner
and placed in series on the wire leads to cover a broad frequency band.
Always locate the choke covering the higher frequency band closest to
the sensor.
8. CALIBRATION
The ST5484E transmier has been factory calibrated for the full-scale vibraon level marked
on the label. If the calibraon is in doubt, the unit can be veried in the eld by following
the procedures outlined below. Note that there are no Zero and Span adjustments on the
transmier. Addionally, the transmier uses a true RMS amplitude detecon circuit; units
supplied with a full scale range in peak units scale the underlying RMS measurement by a
Figure 5: Leads may also be
looped through the ferrite
core to aenuate dierent
frequencies. The opmal
number of loops will vary
by applicaon and the
interfering frequency(ies).
Figure 4: Leads may be
simply fed straight through
the ferrite core.
factor of 1.414 to provide a “derived peak” rather than true peak measurement.
7.1 Zero Vericaon
In the absence of vibraon the output current should be 4 mA ± 0.1 mA. If the ambient
vibraon exceeds 2% of full scale, the transmier should be removed from the machine and
placed on a vibraon free surface for this measurement. Oen a piece of foam can be used
to isolate the transmier from external moon.
7.2 Span Vericaon
Subject the transmier to a known vibraon within the full scale range marked on the label.
If you are using a portable vibraon shaker where it can be tested at full scale, the output
should be 20 mA ± 0.5 mA.
9. OPTIONAL DYNAMIC OUTPUT
The transmier can be ordered with an oponal dynamic output. Transmiers supplied with
this opon can be idened by the presence of four ying leads instead of two (Figure 6), or
four terminal connecons instead of two (Figure 7).
The dynamic output is an acceleraon signal with a sensivity of 100 mV/g, ltered to the
Doc# M9162• REV AB (April 2019) Page 10 of 12
same frequency band as used for the 4-20mA velocity measurement (refer to opons E and
F on the Metrix Datasheet 1004457).
Observe the following when using this output:
• Only an electrically-isolated or baery-
powered portable vibraon analyzer
should be used when connecng to this
output. Since this is a loop-powered
device, an external ground will aect the
loop output and could cause a false alarm.
• When using a portable vibraon analyzer
or data collector, be sure to turn the
instrument sensor power o.
• Most portable vibraon analyzers have a
low input impedance and they will load
this signal, resulng in aenuaon of as
much as 20% to 30%. Refer to Table 1
which shows the nominal aenuaon
expected for a given input impedance.
• In all cases for all locaons, the use
of this signal is for temporary connec-
on only. Permanent connecon could
violate hazardous locaon installaon
requirements.
• Avoid impacng the transmier or
introducing other mechanical vibraons
when connecng to this output. Such
vibraon could result in spurious alarms
or machinery trips.
• When output is not in use, be sure leads
cannot touch conduit or each other
as this will aect the 4-20 mA current
output.
• Avoid introducing electrical noise when using
this output. Do not use this output with leads
longer than 5m (16 feet). Use of longer leads can
introduce electrical noise and aenuate high-
frequency signal content that may be present in
the raw acceleraon signal.
7
6
Table 1
Input Impedance
of Analyzer
dB
Aenuaon
10 MEG 0.01
5 MEG 0.02
2 MEG 0.04
1 MEG 0.09
500 K 0.18
200 K 0.43
100 K 0.84
50 K 1.61
20 K 3.57
10 K 6.10
Doc# M9162• REV AB (April 2019) Page 11 of 12
10. SPECIFICATIONS, ORDERING INFORMATION AND OUTLINE
DIMENSIONAL DIAGRAMS
Refer to Metrix product datasheet 1004457 for addional informaon.
Figure 1: Outline dimensions of the ST5484E (all
versions except MIL-Style Connector). Dimen-
sions in mm [inches]. Oponal* 8200-001 conduit
elbow shown installed.
* NOTE: 8200-AAA-IEC elbow is mandatory for
ATEX/IECEx/INMETRO Ex d (ameproof) ap-
proved installaons.
Figure 2: Outline dimensions of the
ST5484E-XXX-XX4-XX (MIL-Style Connector).
Dimensions in mm [inches].
Doc# M9162• REV AB (April 2019) Page 12 of 12
11. ENVIRONMENTAL INFORMATION
This electronic equipment was manufactured according to high quality stan-
dards to ensure safe and reliable operaon when used as intended. Due to its
nature, this equipment may contain small quanes 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 axed to this product is a reminder to dispose of this product
in accordance with local WEEE regulaons. If you have quesons about the disposal pro-
cess, please contact Metrix Customer Service.
info@metrixvibraon.com
www.metrixvibraon.com
8824 Fallbrook Dr. Houston, TX 77064, USA
Tel: 1.281.940.1802 • Fax: 1.713.559.9421
Aer Hours (CST) Technical Assistance: 1.713.452.9703
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