Metrix 440 User manual

440 & 450 ELECTRONIC VIBRATION SWITCHES
Installaon Manual
1. OVERVIEW
1.1 Introducon
The single setpoint models (SR) contain one
trip limit for shutdown. The oponal dual
setpoint models (DR) contain two indepen-
dent trip limits; one for alarm and one for
shutdown. Shutdown and alarm limits are
in engineering units of velocity. In addion,
a 4-20 mA output proporonal to vibraon
velocity is provided.
Models 440 and 450 use idencal design
and dier only in the enclosure. The model
440 is designed to be used in non-hazardous
or non-incendive hazardous locaon (Class
I, Division 2, Groups B, C, D, and NEMA
4X). The model 450 is designed to meet
explosion-proof requirements for Class
I, Division 1, Groups B, C, D installaons.
Unless otherwise noted, all discussions and
diagrams herein assume the model 440, but
apply equally to the model 450.
1.2 KeyCapabilies
• Shutdown and alarm sengs are based
on vibraon severity. The internal sen-
sor (unless the external sensor opon
has been specied (Ordering Opon
I=5 – see note in Secon 5.4) is a piezo-
electric crystal with built in microelec-
tronics to reduce noise sensivity. The
output signal is electronically integrat-
ed to measure and trip on velocity.
• Calibrated setpoint controls permit set-
point adjustment of vibraon velocity
levels up to full scale range. DR model
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NOTE: Discrete outputs should be manually bypassed during
this procedure, parcularly if used to trip the machine. They will
change state aer the me delay, and should be externally jump-
ered or otherwise disabled to prevent nuisance trips.
Calibrated setpoint controls
enable operator to set specic
velocity alarm/shutdown levels.
Adjustable me delay of 2-15 seconds.
LED illuminates immediately when vibraon ex-
ceeds setpoint (but alarm or shutdown discrete
outputs will change state only aer me delay).
1.3UserInterface
KeyCapabilies(connued)
switches have dual setpoints – one for alarm and one for shutdown – that are indepen-
dently adjustable.
• 4-20 mA output provides a convenient interface for trending and displaying vibraon
amplitude in a programmable logic controller (PLC), SCADA system, data logger, or oth-
er instrumentaon. 4mA corresponds to no vibraon, and allows the user to disnguish
between no power to the switch (0mA) and a funconal switch but with no vibraon
present (4mA). 20mA corresponds to full scale vibraon amplitude.
• Discrete outputs used for alarming and shutdown can be selected from triac, solid-
state analog switch (FET), or electromechanical relays, but must be specied at me of
ordering. These outputs are independently congurable for open on alarm/shutdown
or close on alarm/shutdown .
• An adjustable (2-15 seconds) me delay is standard. This prevents false alarms/shut-
downs on high startup vibraons and also from non repeve transient events.
• Self-test and vericaon: An LED adjacent to each setpoint control illuminates the
instant the measured vibraon level exceeds the setpoint. The unit can be periodically
veried on line by turning the setpoint control down unl the LED comes on. This set-
ng is then compared with the vibraon amplitude measured via a portable vibraon
meter at the same locaon as the switch’s sensing element, providing a vericaon
check of the unit.

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NOTE: Turning either adjustment knob to the TEST posion reduces
the corresponding setpoint to its minimum allowable value, eec-
vely meaning that any vibraon will exceed the setpoint. Although
the LED will come on immediately, the discrete output will change
state only aer the duraon of the adjustable me delay has elapsed.
If the TEST posion is maintained for less than the duraon of the me delay,
the discrete output will not change state.
VDE approved terminal strip
accepts #12 AWG wire. All
hardware is capve.
Each discrete output is inde-
pendently eld congurable to
open on alarm (N.C.) or close
on alarm (N.O.)
3. SAFETY WARNINGS
CAUTION - SHOCK HAZARD 230/110 VOLTS
The terminal block inside the 440 is connected to AC power
(110 VAC or 230 VAC depending on model) except DC input
power models.
If adjustments to the device are being made with power applied, exer-
cise cauon to avoid contact with the terminal block screws by any part
of the body or electrically conducve tool.
EQUIPMENT OPERATION
Model 440 and 450 vibraon switches must be installed and operated
as described in this manual and in accordance with published datasheet
specicaons. Operaon outside these limits may adversely aect the
switch’s alarming and shutdown capabilies, resulng in damage to
machinery and property as well as jeopardizing personnel safety.
2. SPECIFICATIONS
Refer to product datasheet 1004730, available online at www.metrixvibraon.com.

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4. MECHANICAL INSTALLATION
4.1 Where to Mount the Switch
It is desirable to mount the electronic switch (or transducers for switches with external
transducer opon) on a bearing housing, since the forces generated by the rotang parts
through unbalance, misalignment, bearing wear, etc., are transmied to the machine’s cas-
ing through the bearings.
Most bearing housings are curved so it is necessary to aach a bracket with a at surface for
mounng the switch. If the machine has bolted end plates on the bearings or horizontally
split bearing housings, these bolts can be used to aach the bracket.
When bolt holes are not available or are not suitable, an alternave way is to weld an angle
iron bracket similar to that in the sketch, but oriented so as to straddle the bearing housing.
The best approach will typically be to mount a gusseted bracket, as shown below.
The guiding principle is to ensure that the bracket is suitably s such that machinery
vibraon is completely transmied through the bracket to the vibraon switch or sensor.
Problems can occur when the bracket is too compliant, and may allow bracket resonance
to amplify the actual machinery vibraon, resulng in false shutdowns or alarms. For many
applicaons, 3/8 Inch material (preferably steel) will be suitable.
4.2 SwitchSensiveAxis
The sensive vibraon “measuring” axis is perpendicular to the mounng base of the unit
(vibraon switch or transducer). Always mount the unit such that the desired vibraon of
the equipment being monitored will occur along this axis.
NOTE: Models using an external sensor will be sen-
sive along the sensor’s axis, not the switch’s axis.

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4.3 ChoosingMounngOrientaon
The vibraon switch can be mounted in the vercal or horizontal orientaon (or anything in
between) without a change in its sensivity. Ideally, the mounng orientaon will be chosen
by measuring the vibraon levels in both direcons with a vibraon meter and then select-
ing the direcon in which the highest vibraon occurs. This will typically be horizontal, since
most machine structures are less rigid horizontally than vercally.
4.4 NumberofPointsperMachine
Anywhere from one to four switches are used per machine (depending on how crical the
machine is to the process or how expensive it is), one on each end of the motor and one on
each end of the compressor, fan, pump or whatever is being driven. If there is a gear box in
between, one may be used here also.
It is quite common to use only one switch. In this case, it is best to mount on or near the
driven bearing. For example, if you have a motor and large fan with a bearing on each end
of the fan, the fan bearing on the motor side would be the driven bearing. It will usually see
the highest forces and have the highest vibraon level.
4.5 MounngatotherLocaons
When it is not possible to mount the switch directly on the bearing housing, the switch can
be located elsewhere, keeping in mind that it is usually machinery vibraon that is being
measured (not bracket, piping, or other vibraon). Do not mount the switch in locaons
where very lile machinery vibraon is transmied, as the switch will be less sensive to
damaging changes in machinery vibraon levels. Again, it is desirable to survey the machine
with a vibraon meter. If the level at the intended locaon is not aenuated by more than
about 50% relave to the levels directly on the bearing housing, it will probably be sasfac-
tory. However, alarm and shutdown sengs should then be reduced proporonately as well.
4.6 MounngSurface
Choose or fabricate a solid (rigid) surface (on the equipment being monitored) to mount
the vibraon switch or transducer. This will ensure transfer of the vibraon to the vibraon
transducer, while not introducing erroneous vibraons. In addion, the surface presented to
the base of the unit should be at. Fasten using sturdy hardware at all places provided.
4.7 TemperatureConsideraons
The switch is designed to dissipate internal heat by conducon through its base. Hence, it is
important to keep the mounng surface below the switch max temperature limit of 140°F. If
the equipment being monitored is going to exceed this limit, consideraon should be given
to either using one of the remote transducers, or thermally isolang the switch. To ensure
accurate switch performance, a warm up me of 5 minutes is recommended.
4.8 ElevaonConsideraons
The reduced atmospheric pressure at elevaons more than 2,000 meters (~6600 feet) above

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sea level does not allow heat to dissipate as readily as at lower elevaons, and the maximum
operang temperature must be de-rated by 2% per 300 meters. Thus, a switch installed at
an elevaon of 2,600 meters will have a maximum operang temperature 4% lower than
a switch installed between seal level and 2,000 meters. Refer to datasheet 1004730 for
complete specicaons.
4.9 Cable/Wiring
The method chosen to electrically connect to the switch or transducer should be mechani-
cally exible, to eliminate the measurement of vibraon of material not of interest (piping,
etc.), and provide a moisture barrier as well.
Although seal ght and other exible conduit have been used successfully, in areas of
extreme humidity or moisture it is recommended that a “SO” type cable together with a
suitable rain-ght CGB ng be used.
No stress should be possible on the wiring to the terminal block. If such protecon is not
provided by the conduit system, some form of stress relief must be installed where the wir-
ing exits the 440.
To reduce suscepbility to EMI/RFI, any signal-level wiring such as transducer, reset, lockout,
or 4-20 mA loop should ulize shielded cable in EMI-proof conduit, separate from any power
wiring. The signal-wiring conduit and power-wiring conduits can be connected at the switch
entry via a “T” ng.
4.10 Sealing
In installaons where temperature and humidity condions vary around the dew point, it is
important that the cover be evenly and rmly fastened down with the four screws provided
(model 440) or via the threaded cover (model 450).
Although the switch enclosures meet NEMA standards for water ghtness, this assumes the
cover is properly seated and wiring/conduit entrances use proper seals.
5. ELECTRICAL INSTALLATION
5.1 WiringtotheVibraonSwitch
See terminal numbering legends below. Refer also to the wiring diagrams of secon 8.
NOTE: Unless proper drains and/or poured seals are used,
conduit can allow moisture entry into the switch. Use good
installaon pracces that slope conduit away from the
switch, use drains (non-XP installaons only), and make
certain that cable jackets are not nicked or scued which might
allow moisture to wick into the switch via the conductors.

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5.1.1 Input Power
Connect a grounding wire to the grounding screw provided in the switch. This is impor-
tant for safety as well as noise. For AC powered units, power only with the voltage level
indicated on the inner cover label. Orientaon of AC power to terminals 1 and 2 is not
important. For DC powered units, connect +24V to Pin 1 and Ground to Pin 2.
5.1.2 Shutdown Circuit
The internal shutdown switch circuit is designed to be wired in series with the external
shutdown circuit i.e.; motor starter, relay, contactor, etc.
5.1.3 RemoteReset
Shielded wire is required. To avoid creang ground loops, the N.C. remote switch contacts
should be electrically isolated from other circuits or grounds. NOTE: Remote reset is dis-
abled if pushbuon reset opon is selected.
Lockout(Oponal)
Terminal 7 will be labeled “Lockout”. Shielded wire is recommended. To avoid the possibility
of ground loops, the remote N.O. lockout switch contacts should be electrically isolated from
other external circuitry or grounds.
5.1.4 4-20mAAnalogOutput
To avoid the possibility of ground loops, the 4-20 mA remote meter terminals should be
electrically isolated from external grounds. Shielded wire is recommended to protect
against damage due to long wire runs and the possibility of high induced voltage spikes
from storms, etc. The 4-20 mA output is self powered and therefore requires no external
power source.
5.1.5 AlarmCircuits
The internal single pole solid state switch between terminals 13 and 14 is designed to be
wired in series with the external alarm circuit i.e.; annunciator, lamp, relay, etc.
5.2 FunconalDescriponandInstallaonConsideraons
5.2.1 Alarm or Shutdown
5.2.2 UnitswithTriacOutputs(orderingoponsDand/orE=1)
The triacs used in model 440/450 vibraon switches carry medium power rangs and are
useful in controlling relays, contactors, and most motor starters directly. Maximum noise
immunity is obtained when used in the open on alarm (N.C.) mode. Consult Metrix prod-
uct datasheet 1004730 for comprehensive specicaons pertaining to triac outputs.
5.2.3 UnitswithAnalogSwitch(FET)Outputs(orderingoponsDand/orE=2)
For light loads such as computers or PLCs, the analog switch output is easier to interface
since it has virtually no leakage current. The analog switch does not require the 50 mA
holding current of a triac and operates equally well with AC or DC. Consult Metrix product
datasheet 1004730 for comprehensive specicaons pertaining to FET outputs.
NOTE: DR models have both Shutdown and Alarm
circuit present; SR models have only Shutdown circuit.

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5.2.4 UnitswithElectromechanicalRelayOutputs(orderingoponsDand/orE=4)
Electromechanical relays are also available and represent the most exible type of output.
They are a good choice for a variety of applicaons. Consult Metrix product datasheet
1004730 for comprehensive specicaons pertaining to relay outputs.
5.2.5 Open/CloseonAlarm
The alarm and shutdown triacs (or analog switches) are independently eld seable
for N.O. (close on alarm) or N.C. (open on alarm). The switches are accessible with a
non-conducve screwdriver via the inner side panels. Open on alarm is recommended in
installaons where triac lines are likely to be noisy, i.e.: large transient voltage spikes due to
unsuppressed relay, solenoid or other inducve loads.
5.2.6 AutoResetMode
In this mode, alarm and shutdown switches are automacally reset to the non-alarm/non-
shutdown condion when the vibraon level falls below the set point.
5.2.7 Latch Mode
In this mode, alarm and shutdown switches remain “latched” in alarm (shutdown) condi-
on when the vibraon level exceeds the set point for the duraon of the me delay. The
unit is in this condion when the reset terminal is connected to common.
RemoteResetMode
When wired in this mode, the alarm and shutdown switches latch in “trip”, but can be reset
to the “non-alarm/non-shutdown” mode by momentarily interrupng the connecon from
terminal Reset to Common. This can be accomplished with a normally closed momentary
switch. The switch contacts should be isolated from other circuits, potenals or grounds.
5.2.8 20-SecondLockout(oponal)
With this opon, the shutdown and/or alarm triacs will not be permied to actuate for 20
seconds aer Lock out is connected to Common.
5.2.9 4-20 mA Output
This loop supplies its own 24Vdc power and provides a 4-20 mA output current propor-
onal to vibraon.
Most switches are supplied with ordering opon B=2 (absolute 4-20mA output reference)
where 4mA = no vibraon and 20mA = full scale vibraon (refer to product datasheet
1004730 for full scale range opons). A small number of older switches may use a B op-
on other than 2, designang an analog output that is proporonal to the setpoint rather
than the full-scale range. Consult the factory for addional informaon.
5.3 SpecialConsideraons
NOTE: Remote reset is disabled if
pushbuon reset opon is selected.
NOTE: Do NOT connect the 4-20mA output to an exter-
nal source of loop power as this may damage the switch.

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5.3.1 LightLoads
The solid state triacs used in the standard 440 series are a special high transient immunity,
medium power type. O state leakage is 1 mA max and should not create any problems,
even when interfaced with a load as light as a programmable controller.
Minimum load required to keep the triac on is 20 mA typical and 50 mA max due to the
“holding current” specicaons. If the load is less than this, a resistor may have to be
placed in parallel with the load, i.e.; for 115 VAC light load (50 mA or less) a 2K-ohm 10
wa power resistor is recommended.
5.3.2 D.C.Loadswithtriacs
Although most applicaons use AC input power and AC on the triac outputs (alarm and
shutdown), these triacs may be used in DC applicaons providing minimum loading re-
quirements are met. When DC is used, a triac will automacally latch in the “on” condion
aer trip, thus only “close on alarm” (N.O.) can be used. To reset an external reset switch,
the rest switch must be wired in series with the load. To avoid large voltage drops during
DC operaon, the triac should be connected as follows:
Shutdown: Term 4 POS Alarm: Term 14 POS
Term 3 NEG Term 13 NEG
5.3.3 170mAAnalogSwitchOpon
The special condions of secons 5.3.1 and 5.3.2 do not apply. However, maximum cur-
rent is limited to 170 mA.
5.4 FunconalCircuitBlockDescripon
An internal transducer module consisng of a crystal assembly and integral charge amplier
senses vibraon. Thus, the electrical output of the transducer is a well-buered (low imped-
ance) signal directly proporonal to vibratory acceleraon levels (g) at the switch.
The raw acceleraon signal goes to a custom hybrid circuit that integrates the signal and pro-
vides an AC signal proporonal to vibratory velocity instead of acceleraon. This signal is then
routed through an amplier, the gain of which is controlled by the shutdown setpoint.
Next, the signal is processed through a true RMS-to-DC stage and compared against a preset
internal voltage reference. If the signal level is higher than reference, the shutdown LED is
illuminated.
If the voltage level stays above the reference for the duraon of the me delay, an output
trip occurs and the shutdown solid-state relay will trip.
Alarm trip is derived in much the same manner, branching from the output of the RMS-to-
DC stage. Likewise, the DC output is directed to the voltage-to-current hybrid.
NOTE: Models using an external (Ordering Opon I=5)
sensor do not have an internal accelerometer and will
measure vibraon at the sensor locaon, not the switch
locaon. Refer to Metrix product datasheet 1004730 for a list
of ordering opons characterizing external transducers.

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6. CONTROL SETTINGS
6.1 SengTripPoints
The Model 440DR provides two setpoints: one for alarm and one for shutdown.
The rst alarm is normally set at a vibraon alarm level to provide early warning that the
condion of the machine is deteriorang. If the machine condion connues to deteriorate,
the shutdown setpoint provides protecon against catastrophic failure. The shutdown and
alarm setpoints are set directly in inches/seconds or mm/sec.
The Warning Level Guide below indicates recommended starng points for vibraon warning
levels, dened as levels at which abnormal wear is occurring. Vibraon analysis by compe-
tent machinery diagnosc personnel is recommended when a warning alarm level has been
reached. Dierent warning levels are given for dierent types of machinery.
NOTE: SR models provide only
one setpoint (shutdown).
NOTE: The ranges below are typical. Each machine
will have its own acceptable levels of vibraon,
depending on how it is loaded, the parcular instal-
laon, and the tolerances of the machine itself. The chart
below is a guideline and does relieve the user of respon-
sibility for determining their own acceptable alarm and
shutdown levels for the equipment at hand.
WarningLevelGuide
6.2 SengofTimeDelay
An important feature of Model 440/450 switches is the built-in me delay. This prevents
triggering of the alarm or shutdown funcons from transient increases in vibraon levels. It
also avoids shutdown due to transitory vibraons occurring during start-up.
The me delay is adjustable. The factory default seng is three (3) seconds unless specied
otherwise.

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The me that the vibraon amplitude must persist above a setpoint before the discrete out-
put changes state is individually adjustable for shutdown and alarm from 2 to 15 seconds.
To readjust the me delay, turn the shutdown setpoint (or alarm setpoint for alarm me
delay) knob CCW unl the LED illuminates. The me from this point to relay actuaon is
the me delay. Change the me delay via a nylon non-conducve screwdriver. Set CW to
increase me delay (one complete turn is approximately 0.5 seconds). Then, recheck and
readjust unl the desired me delay is achieved.
6.3 TestMode
The TEST posion of both shutdown and alarm setpoint adjustment knobs is used to test
the switch funcons without the need for vibraon. When the shutdown knob is turned to
TEST, the shutdown LED should illuminate and the discrete output should change state aer
the delay me (see secon 6.2) has elapsed. The alarm TEST posion (available only on DR
model switches) funcons in similar fashion, but has no eect on the 4-20 mA output.
6.4 AscertainingCurrentVibraonLevels
When the 4-20mA output is not being used with a strip chart recorder, PLC, or other log-
ging device, you can place an ammeter across this output and the current measured. 4mA
corresponds to zero vibraon and 20mA corresponds to full scale vibraon. Readings in
between these two extremes can be ascertained by scaling proporonately from 0% (4mA)
to 100% (20mA). Alternavely, the LED indicators for alarm (DR model only) or shutdown
(both SR and DR models) can be used. Since these LEDs acvate instantaneously (i.e., before
the adjustable me delay of secon 6.2), they can be used in a momentary fashion to check
the machine’s actual vibraon level. Slowly decrease the setpoint by turning the setpoint
adjustment knob counter-clockwise unl the corresponding LED illuminates. Note this set-
ng and quickly return the knob to its original seng (before me delay runs out). The level
at which the LED illuminates corresponds to the actual vibraon level.
NOTE: If the shutdown or alarm knob is moved
to the TEST posion but then returned to a nor-
mal seng before the duraon of the me delay
has elapsed, the LED will come on but the discrete
output (triac, FET, or relay) will not change state.
NOTE: For DR model switches where both shut-
down and alarm setpoints will be available, it is
recommended that the alarm setpoint adjustment
be used for this procedure instead of the shutdown
setpoint, to prevent an inadvertent machine trip.

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7. OUTLINE & DIMENSIONS
440 Model
Units: mm [in]

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450 Model
Units: mm [in]

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8. WIRING DIAGRAMS
These diagrams depict connecons for models with all opons present. Not all connecons
may be available on your specic switch(es), depending on whether oponal features were
specied at me of ordering.

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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
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 pro-
cess, please contact Metrix Customer Services.
ENVIRONMENTAL INFORMATION