Metrix ST5491E Manuale utente

ST5491E 2-WIRE SEISMIC VIBRATION TRANSMITTER

Installaon Manual

DOC# M9344 • REV K (April 2022)

OVERVIEW

The Model ST5491E Seismic Vibraon Trans-

mier is the latest version of an established

series of transmiers from Metrix. The

ST5491E is the indicang version of Metrix

Model ST5484E and comes with an integral

2-1/2 digit LCD indicator for local vibraon

readout. It incorporates state-of-the-art

electronic components and circuits. It also

oers several new opons in terms of fea-

tures and conguraons.

The transmier combines a vibraon sensor

and signal condioner in a single package.

They provide the ideal soluon for sensing

machinery vibraon level and transming

a proporonal 4-20 mA signal directly to a

PLC, DCS, monitor, or computer. Typical ap-

plicaons include low- and medium-speed

machines such as fans, blowers, pumps, mo-

tors, and centrifuges. The transmier can

be supplied with oponal screw cover elbow

ngs for connecng exible conduit.

The transmier is all solid state, has no

moving parts, and is encapsulated in a

stainless steel housing. The LCD indicator

is packaged in a sealed module that can be

posioned in 90° increments with the elbow

ng to allow proper viewing when the

transmier is installed. Each transmier is

factory calibrated to the sensivity marked

on the label.

Doc# M9344 • REV K (April 2022) Page 2 of 8

INSTALLATION

1. MOUNTING

The transmier body must be solidly mounted to the machine surface. See the secon

Typical Transducer Placement. Dierent machine preparaons are required for the two

basic transmier mounng styles; NPT (Naonal Pipe Thread) and machine thread (UNF and

Metric). Transmiers with the NPT type mounng stud are secured by the thread engage-

ment and the base of the transmier does not come in contact with the machine surface.

On the other hand, transmiers with the machine thread studs must make contact with the

machine surface. The transmier base must make square and direct contact. This requires

preparing the surface of the machine with a 1 1/2 inch counter bore (surfacing tool). This

tool can be used with a portable drill equipped with a magnec base take care such that the

tapped and threaded hole is perpendicular to the machined surface. The transmier must

make contact all the way around its base surface. Contact Metrix for more detailed instruc-

ons for using a counter bore.

If installing a transmier with a standard 1/4 inch NPT stud, drill a hole using a 7/16 inch bit,

5/8 inch deep. Then tap using a 1/4 - 18 NPT (tapered pipe tap). Hand ghten the transmit-

ter and then turn an addional 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 potenally damage

electronic components. A minimum of ve threads of engagement should be made. A 1/4

inch to 1/2 inch NPT bushing is available for mounng the transmier in exisng 1/2 inch NPT

holes. Also, a Metrix Model 7084 Flange Adapter can be used between the transmier 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. See Accessories.

If installing a transmier with one of the straight machined thread sizes, follow standard

drill and tap procedures. Be sure to not drill a hole larger that the counter bore pilot diam-

eter before using the counter bore to prepare the machine surface. Drill out the hole with

the correct tap drill size aer preparing the surface.

The sensive axis of the transmier is in line with the mounng stud. The transmier can

be oriented in any (0 to 360 degree) posion.

2. WIRING

The ST5491E is connected like any other loop powered transmier. The following is a sum-

mary based on area designaons.

2.A SAFE AREA INSTALLATION

Connect the eld wiring in accordance with the appropriate diagram on page 3. The ST5491E

transmier requires a minimum of 13 VDC for proper operaon. The minimum loop power

supply voltage required is 13 VDC plus 1 volt for each 50 ohms of loop resistance.

ST5491E Example: Signal wire resistance = 10 W

Resistance of receiver = 250 W

Total loop resistance = 260 W

Minimum supply voltage = 260 W (1 VDC/50 W) + 13 VDC = 18.2 VDC

Doc# M9344 • REV K (April 2022) Page 3 of 8

The maximum loop power supply voltage that may be applied is 30 VDC. The maximum loop

resistance (RL) is calculated by the equaon:

RL = 50 (VS - 13) W

Example: RL = 50 (24 - 13) = 550 W for 24 VDC loop supply.

2.B EXPLOSION-PROOF INSTALLATION IN HAZARDOUS LOCATIONS

ST5491E transmiers are CSA cered explosion-proof, Class I (C & D); Class II (E, F & G,).

Connect the eld wiring in accordance with the appropriate diagram on page 3. Refer to

paragraph 2.A for loop voltage and resistance requirements. All conduit and juncon boxes

used must be cered explosion-proof for the class, division and group required by the

applicaon. Installaon of the transmier must meet all of the explosion-proof installaon

requirements of the local governing agency and facility safety procedures.

3. ELECTROMAGNETIC COMPATIBILITY

To meet the requirements of electromagnec compability in areas of high electromagnec

interference, the eld wiring must be:

1. Shielded twisted pair cable enclosed in grounded metallic conduit, or

2. Double shielded twisted pair cable with a metallic body cable gland ng and with the

outer shield grounded.

WIRING DIAGRAMS

Use standard two-conductor, twisted pair, shielded wiring for the long run to the instrumenta-

on enclosure. The transmier is connected like any other loop powered end device.

3.A CONNECTION TO PLC OR OTHER INDICATING INSTRUMENT

The rst step in conguring the PLC, DCS, or other recording instrument is to determine the

source of power. The ST5491E requires loop power be supplied to it. 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 transmier eld

wiring using standard instrumentaon pracces.

Doc# M9344 • REV K (April 2022) Page 4 of 8

Scaling of the display is on the basis of the range of the transmier. The measurement pa-

rameter name is “vibraon” and the units are “ips” (inches per second) or “mm/s” (millime-

ters per second). The example below is based on a standard 1.0 ips transmier.

To prevent nuisance alarms, due to transient operang condions, program an alarm me

delay. Momentary “jolts” that can occur at start-up or during some operang condion

changes, do not reect a machines steady state operang condion. The indicated vibraon

level must cross the threshold level and stay above it for a preset me before any alarm ac-

on is taken. A 2- to 3-second delay is normally applied to most machinery. Consult Metrix if

you have a queson about your machines operang characteriscs.

Some rough starng machinery may also need a start-up me lockout for alarms. A start-up

lockout is dierent than a me delay. Both may be needed.

TYPICAL TRANSMITTER PLACEMENT

The ST5491E measures seismic vibraon at the aachment point on the machine. Its

sensive direcon is through its cylindrical body. It will not measure side to side moon. It

measures velocity vibraon in ips (inches per second). Velocity vibraon is a common mea-

surement for a large variety of machinery.

Figure 1 shows a typical transmier mounng for casing vibraon measurements is in the

horizontal direcon at the bearing housings. Usually the horizontal direcon is more sensi-

ve because of the way machinery is typically mounted. Figure 2 shows the ying leads be-

ing spliced in the conduit elbow. Please be aware the splice can not be made at this point if

in a hazardous area. In this case, make the splice in a second conduit hub (meeng splicing

requirements) at the end of the exible conduit.

The standard lead length is 24 inches. We recommend using the “Y” conduit elbow because it

prevents the conduit from extending too far away from the transmier, liming the likelihood

of geng snagged while working near the machinery. If a 1 inch to 3/4 inch reducer is used at

the elbow, a smaller diameter exible conduit can be used. It is always a good idea to limit

the mass that “hangs” on the transmier. The exible conduit should make a bend in order to

be sure any rigid conduit moon can not feed into the transmier body.

Vibraon Level Transmier Output PLC (or other) Scale

None 4mA +/-0.1mA 0.00 in/s

1.0 in/s 20mA +/-0.4mA 1.00 in/s

Doc# M9344 • REV K (April 2022) Page 5 of 8

TYPICAL APPLICATION AND MOUNTING ARRANGEMENT

Figure 1: Horizontal mounng for casing vibraon measurements.

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

Figure 2: Flying leads spliced in conduit elbow.

Figure 2a: Mounng Types

II II

  

II II

 _

Machine thread style requires prepared surface (spot fac-

ing) for bottom contact

NPT thread style, no prepared surface, (spot fac-

ing), contacts through threads

Doc# M9344 • REV K (April 2022) Page 6 of 8

Set the current loop to the zero current reading of the transmier and adjust the ZERO (R7)

control for a reading of 0.00. Next set the current loop to the full scale current value and

adjust the SPAN (R6) control for the proper indicaon. Alternately adjust the ZERO and SPAN

controls as adjustments interact.

Label Full Scale Reading

1.0 in/s 1.00

19.9 mm/s 19.9

100 mm/s 100

NOTE: If a voltage source is used to generate a

current, a load resistance must be connected

in series with the ST5491E indicator module.

Failure to do so may damage the unit.

Aer calibraon, reassemble the module, reconnect the wiring, and reassemble the unit.

CALIBRATION

The ST5491E transmier has been factory calibrated for the full scale vibraon level marked on

the label. If the calibraon is in doubt the unit can be veried in the eld by following the pro-

cedures outlined below. Note that there are no Zero and Span adjustments on the transmier.

1. Zero Vericaon In the absence of vibraon the output current should be 4 mA ±0.1 mA.

If the ambient vibraon is more than 2% of full scale, the transmier should be removed from

the machine and placed on a vibraon free surface for this measurement. Oen a piece of

foam can be used to isolate the transmier from external moon.

2. Span Vericaon Subject the transmier to a known vibraon within the full scale range

marked on the label. If using a portable vibraon shaker where it can be tested at full scale,

the output should be 20 mA ±0.4 mA. If using another reference, like a similar machine, calcu-

late the current value on a proporonal basis.

The output level can also be compared to a vibraon level read on a portable vibraon meter.

This reading should be taken as close to the transmier locaon as possible.

If you shake the transmier by hand you can produce a high output as long as there are no

high pass lters. Check the conguraon for lters. There is no way of knowing the expected

output when shaking it by hand.

3. Digital Indicator Calibraon of the Digital Indicator requires paral disassembly of the

ST5491E. Remove the Digital Indicator threaded cover. Carefully remove the electronics mod-

ule using a small at head screwdriver. Note how the transmier wires are connected before

disconnecng them. Remove the retaining wire from the boom of the module and carefully

remove the electronics board assembly from the module housing. Connect the electronics

module is series with a current loop that can be accurately set from 4.0 mA to 20.0 mA +/- 0.1

mA.

Doc# M9344 • REV K (April 2022) Page 7 of 8

8201-001, Conduit Union

Fits between transmier and 8200-001 conduit elbow to facilitate installaon and

wiring where there is not enough room to rotate the elbow. Suitable for Class I, Div.

1 (Grps A, B, C & D) and Class II, Div. 1 (Grps E, F & G), hazardous areas. Material: zinc

plated steel.

7084-001, Stainless Steel Flange Mount Adaptor

Provides a means to surface mount transmiers rather than NPT stud (½”: NPT center

hole). Three equally spaced 6.6 mm (0.26’) diameter mounng holes on 38 mm

(1.50”) diameter circle.

7084-002, Flange Mount Adaptor

Same as 7084-001, except center hole is ¼” NPT. Material: stainless steel

8253-002, Bushing

Bushing for ½” NPT mount when screwed onto standard ¼” NPT base. Material: stain-

less steel.

8169-75-002-XXX, Two-wire, Cable Assembly

2 conductor (20 AWG) twisted, shielded PVC jacketed cable, with plated steel grip for

cable strain relief, male ¾” NPT end. Specify -XXX for length in feet. Example: 8169-

75-002-010 =10  (3.1M). Material: zinc plated steel.

93818-004, Cable Grip Strain Relief Fing

3/4” NPT male thread to cable grip. Diameter range: .156” to .25”. Complete with

sealing ring, locknut and hot dip / mechanically galvanized nish. Suitable for NEMA 4

enclosures.

93818-018, Armored Cable Grip Strain Relief Fing

3/4” NPT male thread to cable grip. Armor diameter range: .40” to .50”. Complete

with sealing ring, locknut and a hot dip / mechanically galvanized nish. Suitable for

NEMA 4 enclosures.

CONNECTION

OPTIONAL ACCESSORIES

The ST5491E is available with dierent mounng opons. The performance of the transmit-

ter does not change (except for the dynamic output opon, discussed).

MOUNTING

Doc# M9344 • REV K (April 2022) Page 8 of 8

HAZARDOUS AREA APPROVALS

MODEL ST5491E

UL Approval

(North

America):

CSA Markings:

Models ST5491E-XXX-XX1X-XX:

Class I, Div 2, Groups C,D;

-10°C≤Tamb≤+70°C

Model ST5491E-XXX-XX2X-XX:

Class I, Div 1, Groups C,D; Class II, Div

1, Groups E,F,G; -10°C≤Tamb≤+70°C;

Vmax=29.6V, Imax=100mA, Vi=70.4nF,

Li=0.5uH

CSA/UL Standards:

CSA C22.2 0-10

CSA C22.2 25-1966

CSA C22.2 30-1986

CSA C22.2 94-M91

CSA C22.2 157-M1992

CSA C22.2 61010-1-12

UL 61010-1

UL 50

UL 913

UL 1203

ANSI/ISA-12.12.01-2011

WARNING: DO NOT OPEN

WHEN ENERGIZED

ATTENTION: NE PAS OU-

VRIR QUAND ÉNERGISÉ

EP : Certied explosion proof,

Class I, Groups B,C,D ; Class II,

Groups E,F,G

« SEAL NOT REQUIRED »

This electronic equipment was manufactured according to high quality standards 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 environment. For this reason, Waste Electrical and Electronic Equip-

ment (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: 1.281.940.1802 • Fax: 1.713.559.9421

Aer Hours (CST) Technical Assistance: 1.713.452.9703

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