Wilcoxon iT150 Series User manual

Wilcoxon Sensing Technologies
an Amphenol Company
Frederick, MD 21701 USA Page 1 of 23
Tel: [phone]
Tel: +1 800 WILCOXON
Fax: [phone]
www.wilcoxon.com
97038 Rev. A.1
iT150 Series
Vibration Transmitters
Installation and Operating Manual
Please read this manual thoroughly before making electrical connections and applying
power to the module. Following the instructions in this manual will ensure the
transmitter delivers optimum performance.
Make sure you always use the latest product documentation. The latest manuals and
technical information can be found at www.wilcoxon.com.

Wilcoxon Sensing Technologies
an Amphenol Company
Frederick, MD 21701 USA Page 2 of 23
Tel: [phone]
Tel: +1 800 WILCOXON
Fax: [phone]
www.wilcoxon.com
97038 Rev. A.1
Table of Contents
1Introduction.............................................................................................................................4
2Description ..............................................................................................................................4
3Key features.............................................................................................................................4
4Abbreviations used in this manual............................................................................................5
5Safety Regulations and Installation Notes.................................................................................5
5.1 Safety summary ...................................................................................................................................................... 5
5.2 Declaration of conformity....................................................................................................................................... 5
6Ordering information ...............................................................................................................6
6.1 Part number decoder ............................................................................................................................................. 6
6.2 Ordering Examples ................................................................................................................................................. 6
7Ordering procedure and options...............................................................................................7
7.1 Step 1 - Input type .................................................................................................................................................. 7
7.2 Step 2 - Sensitivity .................................................................................................................................................. 7
7.3 Step 3 - Detector type ............................................................................................................................................ 7
7.3.1 RMS .................................................................................................................................................................... 7
7.3.2 Peak (“equivalent”)............................................................................................................................................. 7
7.3.3 Peak-to-peak (“equivalent”) ............................................................................................................................... 7
7.3.4 True peak (Input/output type = “A” only)........................................................................................................... 7
7.4 Step 4 - Output type ............................................................................................................................................... 8
7.5 Step 5 - Measurement units ................................................................................................................................... 8
7.6 Step 6 - Full scale .................................................................................................................................................... 9
7.7 Step 7 - Measurement frequency range................................................................................................................. 9
8System diagrams ......................................................................................................................9
8.1 Major system components ..................................................................................................................................... 9
8.2 Basic circuit diagram............................................................................................................................................. 10
8.3 Isolation diagram.................................................................................................................................................. 10
9Front panel LEDs .................................................................................................................... 10
10 IO ports and signal assignments ............................................................................................. 11
10.1 Terminal block locations and pin numbers....................................................................................................... 11
10.2 Terminal block pin and signal assignments ...................................................................................................... 11
11 Electrical connections and wiring ........................................................................................... 11
11.1 ESD precaution ................................................................................................................................................. 11
11.2 Pluggable terminal blocks................................................................................................................................. 11
11.3 Sensor/transducer connections ....................................................................................................................... 12
11.3.1 Vibration sensor ........................................................................................................................................... 12
11.3.2 Temperature sensor...................................................................................................................................... 12
11.4 Front-panel BNC sensor output........................................................................................................................ 12
11.5 Dynamic output terminal block connections ................................................................................................... 12
11.6 4-20 mA current loop connections................................................................................................................... 13
11.7 Power supply connections................................................................................................................................ 13
11.8 Cable shielding and earth ground connections ................................................................................................ 14
12 TBUS...................................................................................................................................... 14
13 Power-up ............................................................................................................................... 15

Wilcoxon Sensing Technologies
an Amphenol Company
Frederick, MD 21701 USA Page 3 of 23
Tel: [phone]
Tel: +1 800 WILCOXON
Fax: [phone]
www.wilcoxon.com
97038 Rev. A.1
14 Operation .............................................................................................................................. 15
14.1 Sensor input ..................................................................................................................................................... 15
14.2 Sensor fault indication...................................................................................................................................... 15
14.3 RC coupling for non-standard signal sources.................................................................................................... 15
14.4 Current loop faults............................................................................................................................................ 15
14.5 Loop current equations .................................................................................................................................... 16
14.5.1 Loop A - Vibration......................................................................................................................................... 16
14.5.2 Loop B - Temperature ................................................................................................................................... 16
15 DIN rail assembly and removal ............................................................................................... 17
15.1 Requirements for installation ........................................................................................................................... 17
15.2 DIN rail mounting ............................................................................................................................................. 17
15.3 Preparing the DIN rail TBUS connectors........................................................................................................... 17
15.4 Installing the module onto the DIN rail ............................................................................................................ 17
15.5 Removing the module from the DIN rail .......................................................................................................... 17
16 Troubleshooting..................................................................................................................... 18
16.1 Fault conditions ................................................................................................................................................ 18
16.2 Current loop outputs ........................................................................................................................................ 18
17 Application example .............................................................................................................. 19
18 Maintenance and calibration.................................................................................................. 20
19 Warranty ............................................................................................................................... 20
20 Customer service ................................................................................................................... 20
21 Technical assistance ............................................................................................................... 20
22 Accessories ............................................................................................................................ 20
23 Technical data ........................................................................................................................ 21
24 Revision history ..................................................................................................................... 23
Diagrams & Figures
Figure 1 - True Peak detector behavior ..............................................................................................................................................................8
Figure 2 - Major system components.................................................................................................................................................................9
Figure 3 - Basic circuit diagram ....................................................................................................................................................................... 10
Figure 4 - Isolation diagram............................................................................................................................................................................. 10
Figure 5 - IO port and terminal block locations .............................................................................................................................................. 11
Figure 6 - Sensor connections.......................................................................................................................................................................... 12
Figure 7 - Dynamic output connections .......................................................................................................................................................... 12
Figure 8 - 4-20 mA current loop connections.................................................................................................................................................. 13
Figure 9 - Power supply connections............................................................................................................................................................... 13
Figure 10 - TBUS power terminals................................................................................................................................................................... 14
Figure 11 - Maximum input signal swing with 12V BOV................................................................................................................................ 15
Figure 12 - RC coupling circuit for non-standard signals................................................................................................................................ 15
Figure 13 - Application example...................................................................................................................................................................... 19

Wilcoxon Sensing Technologies
an Amphenol Company
Frederick, MD 21701 USA Page 4 of 23
Tel: [phone]
Tel: +1 800 WILCOXON
Fax: [phone]
www.wilcoxon.com
97038 Rev. A.1
1Introduction
This document contains information on the installation and
operation of the iT150 Series of Vibration Transmitters. The
transmitters are designed and manufactured in the USA by
Wilcoxon Sensing Technologies, Germantown, Maryland.
2Description
The iT150 vibration transmitter performs acquisition and
processing of dynamic vibration signals. The transmitter
accepts vibration signals from piezoelectric (IEPE-type)
accelerometers, piezovelocity transducers (PVT™) and other
sensors with comparable electrical characteristics. The iT150
also features an input for connection to a Model 786T-type
(or compatible) temperature sensor.
The transmitter conditions, digitizes and processes the input
signal using powerful DSP technology. All filtering, frequency
selection, sub-sampling and power detection is performed
digitally, for consistent, reliable results. The vibration
measurement result is then scaled and converted to a 4-20
mA analog output. A temperature measurement result is
also available as a separate current loop output.
The transmitters are factory-configured, allowing for quick
and easy field deployment. There are no hardware jumpers
or switches to set. User-specified parameters include: input
signal type, detector type, output type, English or metric
units, 4-20 mA full-scale range and measurement bandwidth.
The iT150 is housed in a durable plastic enclosure with a 35
mm DIN rail mount. A convenient, front-panel BNC
connector allows monitoring of the buffered sensor output.
LEDs provide at-a-glance operational status and indicate
when power, sensor and 4-20 mA loops are correctly
connected to the transmitter and working properly.
Removable, uniquely-keyed terminal blocks allow for easy
wiring and ensure correct terminal block installation into the
various module IO ports.
3Key features
Eight frequency band options
0.2 - 200 Hz
0.5 - 500 Hz
1 - 1,000 Hz
2 - 2,000Hz
5 - 5,000Hz
10 - 10,000 Hz
20 - 20,000 Hz
10 - 25,000 Hz (true peak only)
Four detector options
True RMS
Equivalent peak
Equivalent peak-to-peak
True peak
Temperature sensor input
Dual, 4-20 mA active current loop outputs
Optional integrated output, based on sensor type
acceleration-to-velocity
velocity-to-displacement
English or metric measurement units
20 V p-p sensor input range, >90 dB dynamic range
Digital signal processing
Built-in constant current source for IEPE sensors
Buffered sensor output on front-panel BNC connector
Buffered sensor and temperature outputs on screw
terminals
3-way isolated (500 VAC) IO ports to prevent ground
loops
Wide, 11-32 VDC power supply input with reverse
polarity and transient protection
TBUS powering (iT3xx compatible)
ESD and short circuit protection on all ports
Pluggable, individually-keyed terminal blocks with screw
terminals on all ports
Front panel LED status indicators
35 mm DIN rail mounting, stackable on TBUS
4-terminal wide (22.5 mm) modular housing
Wide operating temperature range of -40 °C to +70 °C
CE approvals, RoHS compliant

Wilcoxon Sensing Technologies
an Amphenol Company
Frederick, MD 21701 USA Page 5 of 23
Tel: [phone]
Tel: +1 800 WILCOXON
Fax: [phone]
www.wilcoxon.com
97038 Rev. A.1
4Abbreviations used in this manual
AAmps
BOV Bias Output Voltage
DCS Distributed Control System
DIN Deutsches Institut für Normung
DSP Digital Signal Processor/Processing
EMC Electromagnetic Compatibility
ESD Electrostatic Discharge
FFT Fast Fourier Transform
IEEE Institute of Electrical and Electronics Engineers
IEPE Integrated Electronics Piezo Electric
IO Input-Output
IP Ingress Protection
IPS Inches Per Second
LED Light Emitting Diode
mA milliamps
MCU MicroController Unit
mm millimeters
ms milliseconds
mV millivolts
PLC Programmable Logic Controller
PELV Protected Extra-Low Voltage
RMS Root Mean Square
RoHS Restriction of Hazardous Substances Directive
SELV Safety Extra-Low Voltage
5Safety Regulations and Installation
Notes
WARNING: This symbol indicates a caution or warning
that, if ignored, could cause damage to the product or
connected equipment.
This symbol indicates a technical tip or advice on
operation that provides helpful information on how to use or
configure the module.
WARNING: Risk of electric shock
During operation, certain parts of this device may carry
hazardous voltages. Disregarding this warning may result
in damage to equipment and/or serious personal injury.
Provide a switch/circuit breaker close to the device,
which is labeled as the disconnect device for this device
or the entire control cabinet.
Provide overcurrent protection (I ≤ 6 A) in the
installation.
Disconnect the device from all power sources during
maintenance work and configuration (the device can
remain connected to SELV or PELV circuits).
5.1 Safety summary
Because this product is designed to be used in an industrial
environment, personnel involved with the installation,
operation and maintenance of this instrument should be
familiar with all plant safety requirements before using this
product. Only qualified personnel should perform
installation and service.
The transmitter must not be opened. There are no user
serviceable parts within the product. Do not attempt to
repair or modify the module. Replace the module only with
an equivalent device.
The IP20 ingress protection rating (IEC 60529/EN 60529)
implies the module is intended for installation and use only
in a clean and dry environment. The module must not be
subjected to stresses or thermal conditions which exceed the
specified limits.
The device is not designed for use in atmospheres with a
danger of dust explosions. If dust is present, the module
must be installed within an approved housing, whereby the
surface temperature of the housing must be taken into
consideration.
Use common sense and avoid haste during installation and
operation of this product.
5.2 Declaration of conformity
This product complies with the standards
for:
Electrical safety according to EN61010-1
Limits and methods of measurement of radio
disturbance characteristics
Limits for harmonic current emissions
RoHS Directive, 2011/65/EU

Wilcoxon Sensing Technologies
an Amphenol Company
Frederick, MD 21701 USA Page 6 of 23
Tel: [phone]
Tel: +1 800 WILCOXON
Fax: [phone]
www.wilcoxon.com
97038 Rev. A.1
6Ordering information
6.1 Part number decoder
1 True peak detection option available for Input/Output type “A” only.
2 Displacement output option available for Input type “V” only.
6.2 Ordering Examples
iT150-A-100-RMS-A-g-1-10-10000 Acceleration in, 100mV/g, RMS acceleration out, FS=1 g, 10-10000 Hz
iT150-A-500-P-V-mm/s-2-5-5000 Acceleration in, 500mV/g, peak velocity out, FS=2 mm/s, 5-5000 Hz
iT150-A-10-TP-A-g-5-10-25000 Acceleration in, 10mV/g, true peak acceleration out, FS=5 g, 10-25000 Hz
iT150-V-500-PP-D-mils-10-0.5-500 Velocity in, 500mV/ips, peak-to-peak displacement out, FS=10 mils, 0.5-500 Hz
iT150
A
100
RMS
A
1
10000
Output type
A
Acceleration
V
Velocity
DNote 2
Displacement
Full scale
1, 5, 10, 20, 30, 50 (g)
50, 100, 200, 300, 500 (m/s2)
0.5, 1, 2, 3, 5 (ips)
15, 20, 25, 30, 45, 50, 100 (mm/s)
10, 20, 25, 100 (mils) Note 2
0.2, 0.5, 1, 2, 3, 4, 5 (mm) Note 2
Units
g
g
ips
ips
mils Note 2
mils
m/s/s
m/s2
mm/s
mm/s
mm Note 2
mm
Detector type
Output type
FMIN (Hz)
to
FMAX (Hz)
RMS
Peak
Peak-to-peak
A, V, D
0.2
to
200
A, V, D
0.5
to
500
A, V
1
to
1000
A, V
2
to
2000
A, V
5
to
5000
A
10
to
10000
A
20
to
20000
True peak Note 1
A
10
to
25000
10
g
Input type
A
Acceleration
V
Velocity
Sensitivity
10
100
mV/g, mV/ips
500
Detector type
RMS
True RMS
P
Peak (equiv.)
PP
Peak-to-peak (equiv.)
TP Note 1
True peak (10-25000 Hz)

Wilcoxon Sensing Technologies
an Amphenol Company
Frederick, MD 21701 USA Page 7 of 23
Tel: [phone]
Tel: +1 800 WILCOXON
Fax: [phone]
www.wilcoxon.com
97038 Rev. A.1
7Ordering procedure and options
7.1 Step 1 - Input type
Specify the type of sensor to be connected to the
transmitter, either an accelerometer or a velocity transducer.
Input type
A
Acceleration
V
Velocity
7.2 Step 2 - Sensitivity
Specify the sensitivity of the sensor. Units are mV/g for
acceleration and mV/ips for velocity.
Sensitivity
10
mV/g
or
mV/ips
100
500
7.3 Step 3 - Detector type
Next, specify the desired detector type. Four types of power
detectors are available.
Detector type
RMS
True RMS
P
Peak (equiv.)
PP
Peak-to-peak (equiv.)
TP*
True peak
*True peak detector option available for input/output type “A”
only.
The properties and behavior of each type of detector are
explained in the following sections.
7.3.1 RMS
An RMS power detector operates on frequency domain (FFT)
data. It computes the true RMS power level of the input
signal by summing the power levels of all FFT bins in the
measurement bandwidth. Due to averaging, an RMS
detector is relatively insensitive to brief spikes of vibration
and other transients and tends to smooth the signal
response.
True RMS detection is a very accurate method of
determining the total power contained in a signal. It is used
in vibration detection where it is desired to know the total
amount of true vibration energy exhibited by a machine.
The digital signal processor always calculates the true RMS
power level of the input signal and derives peak and peak-to-
peak values from the RMS value.
7.3.2 Peak (“equivalent”)
Peak detection can be selected when it is desired to know
the peak value of the vibration. The peak value is calculated
by multiplying the detected RMS power level by . This
method of conversion results in an “equivalent” peak power
value of the input signal. It is accurate only when the input
signal consists of a pure sinusoidal waveform. Since, in most
cases, the vibration energy is primarily due to a single, high-
level sinusoidal vibration, this method of peak detection
works well.
Many vibration transmitters develop a peak value for
vibration by using this method. The iT150 Series transmitters
have this detection method available to provide comparable
results to other vibration transmitters in use. It is also useful
where users simply wish to have the signal output be in
terms of peak vibration rather than RMS.
7.3.3 Peak-to-peak (“equivalent”)
Peak-to-peak is simply two times the equivalent peak value.
It is best used for displacement measurements. Select this
detector option when plant maintenance records are in
peak-to-peak units.
Tech tip! The choice of RMS versus equivalent peak
detection is usually a matter of user preference. Both work
from the same basic detection method. The choice is usually
determined by local convention. Additionally, historical
vibration data may be in terms of either RMS or peak
vibration, and therefore the selection of vibration units can
be in line with the plant’s historical data.
7.3.4 True peak (Input/output type = “A”only)
Overview
The iT150 also offers a “True Peak” detector option. In
contrast to an RMS power detector, which operates on the
band-limited frequency domain data, the true peak detector
operates on full bandwidth (10 Hz to 25 kHz) time domain
waveform data. By operating on the raw data from the
analog-to-digital converter, the true peak detector accurately
responds to short-duration transients and impulses.
True peak detection is beneficial where it is desirable to
capture short transient vibration events or where non-
sinusoidal waveforms would cause large errors in an
equivalent peak calculation, due to the presence of high
frequency energy in the waveform. Some common
mechanical causes of this type of energy are early bearing

Wilcoxon Sensing Technologies
an Amphenol Company
Frederick, MD 21701 USA Page 8 of 23
Tel: [phone]
Tel: +1 800 WILCOXON
Fax: [phone]
www.wilcoxon.com
97038 Rev. A.1
wear, chipped teeth in a gear set or mechanical faults
capable of creating momentary impacts.
Response and decay times
Figure 1 illustrates the rapid response of the true peak
detector to a transient event that would otherwise be
missed by most vibration transmitters.
Figure 1 - True Peak detector behavior
Demonstrated in the figure is the response of the current
loop output when the sensor input is presented with a very
short-duration pulse (spike). The transmitter captures the
spike and adjusts the 4-20 mA current very quickly to reflect
the short-duration transient increase in vibration. Here, the
pulse is less than a millisecond in duration, yet the true peak
detector is able to accurately capture, and hold, the peak
level.
The output of the true peak detector holds at the captured
peak level for one second to allow for the typical DCS/PLC
system, scanning at one-sample-per-second, to be able to
accurately detect and record the peak of the signal. If no
additional peaks appear at that level, or higher, the output of
the peak detector begins to ramp down at a controlled rate.
This response can be contrasted easily to the response of an
RMS detector. Since the total energy contained in the spike
is miniscule, an RMS detector will not see a significant
change in total signal power.
7.4 Step 4 - Output type
The signal processor can perform a single-stage
mathematical integration of the input signal, resulting in a
velocity output from an acceleration input or a displacement
output from a velocity input.
Note: The True Peak detector type does not allow for an
integrated output. For this reason, the True Peak output
type must be the same as the sensor type, which is
Acceleration.
Specify the desired output type, depending on the sensor
type. Note: If the detector type = TP, the output type must
be acceleration (A).
Output type
A
Acceleration
V
Velocity
D
Displacement
If an integrated output is selected, keep the following tips in
mind:
1. The practical upper limit (FMAX) for velocity
measurements is approximately 5 kHz, as very little
velocity energy is present at higher frequencies. For
displacement, very little motion is detectable above
500 Hz.
2. Performance of the integrator will be improved by
using a high sensitivity sensor (500 mV/g or 500
mV/ips) to increase the input signal level.
7.5 Step 5 - Measurement units
Specify the desired measurement units, depending on the
output type.
Output type
Measurement units
Acceleration
g
m/s/s
Velocity
ips
mm/s
Displacement
mils
mm
Notes:
1. m/s/s = m/s2
2. ips = inches per second
3. mm = millimeters
4. One mil = 0.001 inches

Wilcoxon Sensing Technologies
an Amphenol Company
Frederick, MD 21701 USA Page 9 of 23
Tel: [phone]
Tel: +1 800 WILCOXON
Fax: [phone]
www.wilcoxon.com
97038 Rev. A.1
7.6 Step 6 - Full scale
Specify the 4-20 mA vibration full scale, depending on the
measurement units:
Output type
Full scale
Acceleration
1, 5, 10, 20, 30, 50
(g)
50, 100, 200, 300, 500
(m/s2)
Velocity
0.5, 1, 2, 3, 5
(ips)
15, 20, 25, 30, 45, 50, 100
(mm/s)
Displacement
10, 20, 25, 100
(mils)
0.2, 0.5, 1, 2, 3, 4, 5
(mm)
When ordering, ensure the specified 4-20 mA full scale
output is appropriate for the expected range of vibration. If
the full scale value is too high, the 4-20 mA output may not
respond adequately to low vibration levels. If the full scale
value is too low, the loop may saturate at 20 mA.
7.7 Step 7 - Measurement frequency range
For detector types of RMS, P or PP, the frequency range must
be specified. Specify the measurement frequency range,
FMIN to FMAX, by selecting a range from the table below.
There are seven ranges to choose from.
Note: For the True Peak detector type, the frequency range
is fixed at 10 to 25,000 Hz (FMIN = 10, FMAX = 25000).
Frequency ranges for detector types RMS, P and PP
Detector type
Output type
FMIN (Hz)
to
FMAX (Hz)
RMS
Peak
Peak-to-peak
A, V, D
0.2
to
200
A, V, D
0.5
to
500
A, V
1
to
1000
A, V
2
to
2000
A, V
5
to
5000
A
10
to
10000
A
20
to
20000
True peak Note 1
A
10
to
25000
Frequency range for true peak detector type
FMIN (Hz)
to
FMAX (Hz)
10
to
25000
Tech tip! Lower values of FMAX require more time to
collect and process a “block” of data. This has the effect of
lengthening the amount of time for the RMS detectors to
settle to their final values.
8System diagrams
8.1 Major system components
#
Description
1
Sensor/transducer inputs
2
(Empty)
3
Buffered, dynamic outputs
4
(Empty)
5
4-20 mA current loop outputs
6
Power input
7
LED indicators
8
Buffered sensor output BNC connection
9
TBUS card-edge connector
10
DIN rail
Figure 2 - Major system components
9
8
10
3
4
2
1
7
9
5
6

Wilcoxon Sensing Technologies
an Amphenol Company
Frederick, MD 21701 USA Page 10 of 23
Tel: [phone]
Tel: +1 800 WILCOXON
Fax: [phone]
www.wilcoxon.com
97038 Rev. A.1
8.2 Basic circuit diagram
Shown below are the major functional blocks of the
transmitter.
Figure 3 - Basic circuit diagram
8.3 Isolation diagram
The transmitter features 500 VAC functional isolation
between three zones: power input, sensor input/output, and
both 4-20 mA current loops. Figure 4 shows the isolation
zones.
Figure 4 - Isolation diagram
CAUTION! Functional or operational isolation is
necessary only for the correct functioning of the product. It
does not protect or isolate against electrical shock.
9Front panel LEDs
Two LEDs, located on the front panel, indicate the
transmitter’s status.
PWR
The green PWR LED indicates on/off status.
OFF Unit not powered
ON Normal operating mode
ERR
The red ERR LED indicates system and connection faults.
OFF No faults – normal operation
ON Sensor fault (priority)
BLINKING 4-20 mA loop fault
See the section on “Troubleshooting” for information about
correcting fault conditions.

Wilcoxon Sensing Technologies
an Amphenol Company
Frederick, MD 21701 USA Page 11 of 23
Tel: [phone]
Tel: +1 800 WILCOXON
Fax: [phone]
www.wilcoxon.com
97038 Rev. A.1
10 IO ports and signal assignments
10.1 Terminal block locations and pin numbers
Figure 5 - IO port and terminal block locations
10.2 Terminal block pin and signal assignments
IO Port
Terminal numbers and
signal assignments
Sensor
(vibration + temperature)
1 –No connection
2 –Temperature sensor in (T+)
3 –Signal in / Sensor Power (IN+)
4 –Circuit Common (COM)
Temperature
dynamic output
5 –Circuit Common (COM)
6 –Temperature out (T)
Sensor dynamic output
7 –Circuit Common (COM)
8 –Sensor out (SENS)
4-20 mA Loop B
(Temperature)
13 –B-
14 –B+
4-20 mA Loop A
(Vibration)
15 –A-
16 –A+
Power input
17 –P-
18 –P+
Table 1 - Terminal numbers and signal assignments
11 Electrical connections and wiring
11.1 ESD precaution
CAUTION! electrostatic discharge
Although the transmitter contains ESD suppression devices
on all IO ports, components still can be damaged or
destroyed by large magnitude electrostatic discharge. When
handling the module or making electrical connections,
observe the necessary safety precautions against ESD
according to EN 61340-5-1 and IEC 61340-5-1. This will
reduce the possibility of damage caused by ESD.
11.2 Pluggable terminal blocks
CAUTION! Electrical connections should not be made
with power applied to the module.
All electrical connections to the transmitter are made using
pluggable terminal blocks. The removable terminal blocks
have screw terminals for easy wiring and are uniquely keyed
to ensure correct installation into the various transmitter IO
ports.
The terminal blocks accept 12 AWG through 24 AWG size
wire (cable cross section: 0.2...2.5 mm²).
To make a connection to a terminal block:
1. Strip wire to 0.25” (6.4 mm)
2. Optionally, install a ferrule onto the wire and crimp
securely
3. Insert the wire into the terminal block
4. Use a flat-blade screwdriver to tighten the screw to a
torque of 0.6 Nm (2.1 oz/in)
SENSOR IN
PWR
ERR
DYNAMIC OUT
5
8
6
7
1
4
2
3
16
13
15
14
20
17
19
18
(empty)
CURRENT LOOPS
POWER INPUT
WILCOXON
iT150
P+
P-
REAR
FRONT
FRONT
REAR
MIDDLE
TBUS
MONITOR
Vibration
Transmitter
Solid: Sensor / BOV
Blink: Current loop

Wilcoxon Sensing Technologies
an Amphenol Company
Frederick, MD 21701 USA Page 12 of 23
Tel: [phone]
Tel: +1 800 WILCOXON
Fax: [phone]
www.wilcoxon.com
97038 Rev. A.1
11.3 Sensor/transducer connections
11.3.1 Vibration sensor
Connect the IEPE vibration sensor as shown in ”Figure 6 -
Sensor connections”.
Figure 6 - Sensor connections
A built-in current source supplies a nominal 4.5 mA to the
attached sensor.
11.3.2 Temperature sensor
The transmitter supports a 786T-type (or compatible)
accelerometer with temperature sensor with a sensitivity of
10 mV/°C. The input voltage range for the temperature
signal is 0 to +1.2 VDC.
A 786T accelerometer with a temperature output utilizes the
temperature input on terminal #2. The temperature portion
of the sensor is powered by the accelerometer circuit.
Before being passed to the processing circuitry and dynamic
output terminals, the temperature input signal is low-pass
filtered to remove noise and high frequency content.
Connection of a temperature sensor is optional.
11.4 Front-panel BNC sensor output
A buffered, unfiltered version of the AC vibration sensor
signal, riding on the BOV, is available on the front-panel BNC
connector. This allows live, on-line signal analysis and testing
of the sensor. This analog output is a buffered version of the
raw, unfiltered sensor signal allowing full spectrum analysis.
The BNC output is short circuit protected and has an output
impedance of 50 Ω.
Note: When connecting a portable data collector or online
monitoring system to the dynamic outputs, the external
meter’s internal constant current source, if so equipped,
should be turned off. Failure to do so may result in a
corrupted waveform.
11.5 Dynamic output terminal block connections
The buffered vibration signal is also available as a terminal
block output. This output is in parallel with the front-panel
BNC connector.
A buffered and low-pass-filtered version of the temperature
sensor signal, if applicable, is available as a terminal block
output.
The dynamic outputs are short circuit protected and have a
50 Ω output impedance.
Connect the dynamic outputs to the monitoring equipment
as shown in the diagram. The use of shielded, twisted pair
cable is recommended.
Figure 7 - Dynamic output connections
iT150
(8) SENS OUT 
(7) COM 
(6) TEMP OUT 
(5) COM 
Monitoring Equipment
Sensor
Signal Out/Power in (A)
Common (B)
Temperature out (C)
iT150
 (3) Signal in/Sensor power
 (4) Common
(2) Temperature in

Wilcoxon Sensing Technologies
an Amphenol Company
Frederick, MD 21701 USA Page 13 of 23
Tel: [phone]
Tel: +1 800 WILCOXON
Fax: [phone]
www.wilcoxon.com
97038 Rev. A.1
11.6 4-20 mA current loop connections
The transmitter provides two analog 4-20 mA current loop
outputs, referred to as “Loop A” and “Loop B.” Loop A
current is proportional to the vibration level and Loop B
current is proportional to the measured temperature, if a
temperature sensor is connected. These outputs are usually
wired to a Programmable Logic Controller (PLC) or a
Distributed Control System (DCS).
Both current loop outputs are “active.” That is, the outputs
source the voltage and current for the loops and are
designed to be connected to a passive, resistive load. The
total loop resistance, including the load resistor, should not
exceed 500 Ω.
Route the Loop A output (vibration) to a compatible
monitoring system as shown, being careful to use a properly
sized load resistor. The use of shielded, twisted pair cable is
recommended.
Figure 8 - 4-20 mA current loop connections
The iT150 is shipped with a zero-ohm jumper installed across
the Loop B terminals. This is to prevent an open-loop fault
condition in cases where the Loop B temperature output is
not required or otherwise remains unconnected. If a
temperature sensor is present and the Loop B output is
required, remove the jumper and connect the Loop B output
to the monitoring equipment. Store the jumper in a safe
location so that it is available for future use, if needed.
Loop compliance voltage is 15 volts, ±5%. The current loop
outputs are electrically isolated from all other internal
circuitry and are protected from short circuits.
Caution: The transmitter sources the voltage and
current for both loops. The 4-20 mA outputs will not work
with externally powered loops.
11.7 Power supply connections
A 24-volt DC power source is normally used to power the
transmitter. To provide greater installation flexibility, the
power source voltage may range from 11 volts to 32 volts
DC. This allows the use of power supplies with outputs other
than 24 volts. The power inputs are protected from a
reverse polarity condition and are electrically isolated from
all other internal circuitry.
Connect the power source to the power input terminals, as
shown. The module may also be powered via the TBUS.
Figure 9 - Power supply connections
WARNING: The supply voltage must not exceed 33
volts or damage to the module may occur.
WARNING: The maximum current handling capacity of
the power supply terminals is 4 amps. When using these
terminals to supply power to the TBUS, do not exceed the 4-
amp rating.
iT150
(16) LOOP A OUT+ 
(15) LOOP A OUT− 
(14) LOOP B OUT+ 
(13) LOOP B OUT− 
PLC, DCS, etc.
Power Supply
24 VDC+
COM
iT150
(18) P+
(17) P−

Wilcoxon Sensing Technologies
an Amphenol Company
Frederick, MD 21701 USA Page 14 of 23
Tel: [phone]
Tel: +1 800 WILCOXON
Fax: [phone]
www.wilcoxon.com
97038 Rev. A.1
11.8 Cable shielding and earth ground connections
Shielding and proper earth grounding are important for the
mitigation of interference and proper operation of the
transmitter. A good shield connection prevents egress of
transmitted signals and ingress of interfering sources. Faulty
shield connections, along with the presence of external
sources of interference, can adversely affect signal integrity.
Ensure all cable shields are properly terminated and
connected correctly, as required by the application.
There is no “shield” or earth ground connection on the
transmitter module. Cable shields should be properly
connected to protective earth (PE) ground external to the
transmitter, as called for by the application. For best
electrical performance, cable shields should be terminated
as close as possible to the transmitter.
Wilcoxon provides enclosures with integrated grounding bus
bars that are located in proximity with the DIN rail. The bus
bar should be connected to a central earthing point using
short, low-impedance connections with a large surface area.
To facilitate connecting cable shields to earth ground, DIN-
mount shield connection clamps and grounding terminal
blocks are available from Wilcoxon. See section 22,
“Accessories” for a complete list of items to complement the
installation and operation of the transmitter.
The type of shield connection should be determined by the
expected operating environment:
Connecting the shield at only one equipment end works
to suppress interference caused by electrical fields.
Connecting the shield at both equipment ends works to
suppress interference caused by dynamic magnetic
fields.
The iT150 features galvanic isolation between three circuit
“zones” to help prevent ground loops (See section 8.3,
“Isolation diagram” for more information.) However, the
possibility of ground loops still must be considered when
cable shields are connected at both equipment ends.
12 TBUS
The TBUS allows power to be supplied to multiple modules
without the need for external wiring. Connection to the
TBUS is made via a recessed board-edge connector, located
on the rear of the module, and a IT032 connector. The
board-edge fingers plug directly into the connector.
WARNING: The iT150 TBUS is NOT compatible with
older Wilcoxon iT100/200, iT401 or iT501 series modules.
When connecting modules via the TBUS, connect only
iT150/300 series modules together on the same bus. Do
not connect any other types of modules or devices to the
TBUS. Doing so may result in damage to the modules.
Power can be bused to all modules via shared P+ and P-
supply rails on the TBUS card-edge connector. This allows
one module to supply power to other modules on the bus.
The location of the terminals is shown below. The positive
TBUS terminal (P+) is nearest the power input terminal block.
Figure 10 - TBUS power terminals
WARNING: The maximum current handling capacity
of the TBUS terminals is 4 amps. When powering via the
TBUS, ensure the 4 amp rating is not exceeded.

Wilcoxon Sensing Technologies
an Amphenol Company
Frederick, MD 21701 USA Page 15 of 23
Tel: [phone]
Tel: +1 800 WILCOXON
Fax: [phone]
www.wilcoxon.com
97038 Rev. A.1
13 Power-up
After all wires are connected, power can be applied to the
module. The module begins its power-up sequence
immediately after power is applied. There is no on-off
switch.
During power-up, the front-panel LED indicators will
illuminate for three seconds while a self-check is performed.
After the unit has completed its self-check, the green PWR
LED will remain on. If the transmitter passes its self-test and
the sensor and 4-20 mA loop(s) are connected correctly, the
red ERR LED will be off.
See section 9, “Front panel LEDs” for detailed explanation of
LEDs and unit operating status.
14 Operation
14.1 Sensor input
The transmitter has been designed to accept signals from
piezoelectric (IEPE-type) accelerometers, velocity
transducers and other compatible sensors that have a BOV
(DC bias level) of approximately 12 volts. This allows the
maximum input signal swing without clipping. If the BOV
deviates significantly from 12 volts, the maximum allowable
input signal swing and dynamic range will be reduced
accordingly. The analog input circuitry is powered by
regulated +24 VDC.
Figure 11 - Maximum input signal swing with 12V BOV
14.2 Sensor fault indication
The transmitter continuously monitors the BOV of the sensor
signal. If the BOV falls outside the 5-16 volt range, a sensor
fault will be indicated. When a sensor fault is detected, the
front-panel ERR LED will illuminate.
The transmitter complies with Namur NE43
recommendations for indicating a sensor fault to a control
system by means of the 4-20 mA signal. If the transmitter
detects a fault with the sensor BOV, the current in both loops
will be set to 2 mA. A loop current of less than 4 mA conveys
the fault condition to the 4-20 mA monitoring equipment.
If a sensor fault is indicated, the sensor BOV should be
checked with an isolated (hand-held) DC voltmeter at the
BNC connector and verified it is within the 5-16 volt range.
See “Troubleshooting” for more information on sensor
faults.
14.3 RC coupling for non-standard signal sources
Signal sources not compliant with the BOV requirement can
use the biasing circuit shown below. If more information is
required, contact Wilcoxon technical support.
Capacitance
-3dB frequency
10 µF
6 Hz
47 µF
1.2 Hz
100 µF
0.6 Hz
330 µF
0.2 Hz
Figure 12 - RC coupling circuit for non-standard signals
14.4 Current loop faults
The transmitter continuously monitors the level of both loop
currents and will indicate a fault condition if either set point
current cannot be achieved. A loop fault is caused either by
high loop resistance (>500 ohms) or an unconnected loop
output. When a loop fault is detected, the ERR LED on
the front panel will blink.
If a 4-20 mA output is not required by the application or is to
remain unconnected, a jumper must be installed onto its
screw terminals to prevent an open-loop fault condition from
being detected by the transmitter. If the supplied jumper is
not available, a short piece of hookup wire may be used.
See “Troubleshooting” for more information on current loop
faults.
10 –330 µF
35V
2.7k –3.0k Ω
Signal in
iT150
(3)Signal in/Sensor power
(4)Common

Wilcoxon Sensing Technologies
an Amphenol Company
Frederick, MD 21701 USA Page 16 of 23
Tel: [phone]
Tel: +1 800 WILCOXON
Fax: [phone]
www.wilcoxon.com
97038 Rev. A.1
14.5 Loop current equations
14.5.1 Loop A - Vibration
Loop A current (IA ) is dependent on both the vibration level
and full scale value as defined by the following equation:
IA = 󰇡
 󰇢  
The vibration level is given by:
Level = 󰇡
 󰇢  󰇛 󰇜
Example:
Sensor type = accelerometer
Sensitivity = 100 mV/g
Output type = acceleration
Full scale = 5 g
In the example, when the vibration level is equal to 5 g (500
mV), the loop current will be 20.0 mA. When the vibration
level is equal to 1 g (100 mV), the loop current will be 7.2
mA.
14.5.2 Loop B - Temperature
If a temperature sensor is connected, Loop B current (IB ) is
proportional to the measured temperature (0.133 mA/°C).
Full scale is 120 °C.
Loop B current is defined by the following equation:
IB = 󰇡
 󰇢  
Temperature is given by:
 󰇛󰇜
where T is temperature in degrees Celsius.
Examples:
0 °C = 4.0 mA
24 °C = 7.2 mA
120 °C = 20.0 mA

Wilcoxon Sensing Technologies
an Amphenol Company
Frederick, MD 21701 USA Page 17 of 23
Tel: [phone]
Tel: +1 800 WILCOXON
Fax: [phone]
www.wilcoxon.com
97038 Rev. A.1
15 DIN rail assembly and removal
15.1 Requirements for installation
To protect the module from harsh conditions, it is
recommended to install the unit in a suitable enclosure
(NEMA 4 type, or equivalent) with the appropriate degree of
environmental protection. In all cases, the enclosure must
meet the requirements of the installation.
15.2 DIN rail mounting
The iT150 Series of modules are designed to mount to a
standard 35 mm DIN rail. The rear of the module has a
spring-loaded metal foot catch that holds the module
securely in place. The module is installed onto the rail by
simply snapping it into place.
Each module is 22.5 mm wide and therefore occupies 22.5
mm of DIN rail space.
15.3 Preparing the DIN rail TBUS connectors
Connect the required number of connectors by pushing
them together, as shown.
Attach the connectors to the DIN rail by hooking the latch of
the connectors over the top of the rail and then snapping the
bottom of the connectors onto the rail.
The completed connector assembly on the rail.
15.4 Installing the module onto the DIN rail
With the module tilted up, as shown, hook the top lip of the
module onto the top of the rail while carefully aligning the
DIN rail connector with the card edge slot on the rear of the
module. Gently push the module downward and toward the
rail. Firmly seat the module so the DIN TBUS connector fully
engages the module card edge connector. The metal foot
catch should audibly snap onto the rail. The module is now
mechanically secured to the rail.
15.5 Removing the module from the DIN rail
Locate the metal foot catch on the bottom rear of the
module. The catch is spring loaded. To remove the module
from the rail, insert a small, flat-blade screwdriver or other
suitable tool into the foot catch slot. (The blade must be less
than ¼ inch (6 mm) in width to fit into the slot on the latch.)
Using the screwdriver as a lever, gently push the screwdriver
upward, as shown, to release the locking mechanism. With
the catch released, tilt the module upward and remove it
from the rail and connector.

Wilcoxon Sensing Technologies
an Amphenol Company
Frederick, MD 21701 USA Page 18 of 23
Tel: [phone]
Tel: +1 800 WILCOXON
Fax: [phone]
www.wilcoxon.com
97038 Rev. A.1
16 Troubleshooting
This section contains a list of common problems that may be
encountered while using transmitter and recommended
techniques for resolving the problems.
16.1 Fault conditions
The red ERR LED is on
Problem: Sensor fault (BOV out of range)
Possible causes:
1. Sensor not connected
2. Incompatible sensor
3. Shorted sensor wiring
4. Damaged/faulty sensor
Verify a compatible sensor is connected.
Use an isolated DC voltmeter to check the DC voltage at
the BNC connector. The DC bias must be in the range of
5 to 16 volts. If outside this range, check sensor wiring.
Try another sensor
The red ERR LED is blinking
Problem: Current loop fault
Possible causes:
1. One or both 4-20 mA outputs not connected (loop open)
2. Loop resistance too high
Ensure both loops are connected to a valid load.
If a loop output is not required by the application,
ensure the supplied jumper is installed onto the loop
terminals.
Use an ohmmeter to measure the loop resistance. Total
resistance should be less than 500 ohms.
16.2 Current loop outputs
Current loop A output (vibration) not as expected
(non-integrated output)
Possible causes:
1. Incorrect sensor type
2. Incorrect sensor sensitivity
3. Incorrect transmitter configuration
Ensure the sensor type matches that of the attached
sensor.
Ensure the sensitivity matches that of the attached
sensor.
Verify the power detector type, output type,
measurement units and full scale.
Verify FMIN and FMAX are appropriate for the speed of the
machinery being monitored.
Current loop A output (vibration) not as expected
(velocity output from acceleration input or displacement
output from velocity input)
Possible causes:
1. High level of low frequency energy
2. Sensor signal too low
Specify a higher frequency range to reduce low
frequency content.
Use a high sensitivity sensor (500 mV/g) to increase
input signal level.
Current loop B output (temperature) not as expected
Possible causes:
1. No temperature sensor connected
2. Incorrect temperature sensor sensitivity
3. Faulty sensor
Ensure a 786T or compatible sensor is connected.
Ensure the sensor sensitivity is 10 mV/°C.
Try another sensor.
Current loop outputs “stuck” at 2 mA
Description: Current in both loops remains at 2 mA
Possible causes:
1. Sensor fault
Check front panel ERR LED for BOV fault indication
Verify a compatible sensor is connected.
Check sensor/transducer wiring.
Use an isolated DC voltmeter to check the DC voltage at
the front-panel BNC connector. Ensure the sensor DC
bias is within the acceptable range.

Wilcoxon Sensing Technologies
an Amphenol Company
Frederick, MD 21701 USA Page 19 of 23
Tel: [phone]
Tel: +1 800 WILCOXON
Fax: [phone]
www.wilcoxon.com
97038 Rev. A.1
17 Application example
Figure 13 - Application example

Wilcoxon Sensing Technologies
an Amphenol Company
Frederick, MD 21701 USA Page 20 of 23
Tel: [phone]
Tel: +1 800 WILCOXON
Fax: [phone]
www.wilcoxon.com
97038 Rev. A.1
18 Maintenance and calibration
The iT150 series transmitters contain no user-serviceable parts. All units are factory-calibrated and require no field
adjustment or service. The units have been designed to provide years of continuous, trouble free service under normal
operating conditions.
19 Warranty
Visit the Wilcoxon web site at www.wilcoxon.com for warranty information.
20 Customer service
To obtain a return materials authorization (RMA) number, please contact customer service at 301-330-8811, or fax to 301-
330-8873.
21 Technical assistance
When calling for technical support or warranty information, have ready the following information: Model number, serial
number.
For technical assistance, please contact Wilcoxon’s technical support department:
Phone: [phone]
Fax:[phone]
email: [e-mail]
22 Accessories
Spring shield connection clamp
– Phoenix Contact SKS 8-SNS35, Order No. 3062786
Grounding terminal block
– Phoenix Contact UT 2,5/1P-PE, Order No. 3045033