BW SENSING BWM420 Series User manual

Technical Manual
Voltage Output Dual Axis
Inclinometer
V3.0
BWM420 Series

Bewis Sensing Technology LLC www.bwsensing.com Tel：[phone]
BWM420
Voltage Output Dual Axis Inclinometer
BWM420 is a cost-effective single-axis inclinometer developed and produced by Bewis Sensing,
which adopts MEMS technology and voltage output. It has a measurement range of ±180°, the highest
accuracy of 0.01°, and an operating temperature of -40°C to +85°C. The product uses a high-precision
MEMS accelerometer and a high-resolution differential digital-to-analog converter, with built-in
automatic compensation and filtering algorithms, which eliminates errors caused by environmental
changes to the greatest extent. Convert the change of the static gravity field into the change of the
inclination angle, and directly output the horizontal inclination value through the digital method. This
product has high long-term stability, low temperature drift, simple use, and strong ability to resist
external interference. It is used for surveying and mapping, industrial automation and other industries.
Recommended choice!
Main Feature
●
Structural deformation monitoring
●Surveying and Mapping Instruments
●Equipment automation
●Lifting equipment inclination control
●
Industrial automatic leveling
●Medical instruments
●Photovoltaic automatic tracking
●
Tower tilt monitoring
Application
●
Highest accuracy
：
0.01°
●Range：±90°
●Output：0-5V /0-10V optional
●
IP67 Protection level
●
Dual axis inclination measurement
●Resolution：0.001°
●Power supply：12-35V
●
Dimension
：
L90*W40.5*H26
（
mm
）
Introduction

Bewis Sensing Technology LLC www.bwsensing.com Tel：[phone]
BWM420
Voltage Output Dual Axis Inclinometer
Measurement Range (°) Condition ±180
Measurement axis X
Accuracy (°) Room temperature 0.01
Resolution (°) Completely still 0.001
Zero bias (°/℃) -40~85℃±0.005
Cross axis error(°) -40~85℃0.01
Output frequency (Hz）5-100Hz adjustable Up to 100
Full-scale output current range (V) 4-20（0-20optional）(0-24 optional)
Mean time between failures MTBF ≥90000h
Electromagnetic compatibility According to GBT17626
Insulation resistance ≥100 MΩ
Impact resistance 2000g，0.5ms，3 times/axis
Parameter Condition Minimum Typical Maximum
Power voltage(V) 12 35
Working Current (mA) No load 20 30 40
Output load （kΩ） Resistive 10
Output load (mF) Capacitive 20
Operating Temperature (℃) -40 25 85
Storage Temperature (℃) -55 25 100
Product Feature
Resolution: The smallest change value of the measured value that the sensor can
detect and distinguish within the measurement range.
Accuracy: The root mean square error of the actual angle and the sensor measuring
angle for multiple (≥16 times) measurements.
Electrical Index
Performance Index

Bewis Sensing Technology LLC www.bwsensing.com Tel：[phone]
BWM420
Voltage Output Dual Axis Inclinometer
Connector
Metal Joint（Cable 1.5m)
Protection level IP67
Shell material Magnesium aluminum alloy oxidation
Installation Three M4 screws
Product size: L47*W36*H15 (mm) The length and width may have an error of
±1mm, please refer to the actual product
Bara board product size
Product size：L90*W40.5*H26（mm）
Package product size
Mechanical Index

Bewis Sensing Technology LLC www.bwsensing.com Tel：[phone]
BWM420
Voltage Output Dual Axis Inclinometer
Installation
Finally, the mounting surface of the sensor and the surface to be measured must be tightly fixed,
smooth in contact, and stable in rotation, and measurement errors due to acceleration and vibration
must be avoided.
Secondly, the bottom line of the sensor and the axis of the measured object cannot have an
angle as shown in Figure E, and the bottom line of the sensor should be kept parallel or orthogonal
to the axis of rotation of the measured object during installation. This product can be installed
horizontally or vertically (vertical installation needs to be customized), and the correct
installation method is shown in Figure F.
The correct installation method can avoid measurement errors. When installing the senso r,
please do the following:
First of all, make sure that the sensor mounting surface is completely close to the measured
surface, and the measured surface should be as level as possible, and there should be no included
angles as shown in Figure A and Figure C. The correct installation method is shown in Figure B
and Figure D.
the measured surface
uneven surface
generates the
angle
the measured surface
C D
AB
the measured surface the measured surface
uneven surface
generates the
angle
+X

Bewis Sensing Technology LLC www.bwsensing.com Tel：[phone]
BWM420
Voltage Output Dual Axis Inclinometer
Electrical Interface
DC 12-35V
RXD
TXD
GND
RED
GREEN
YELLOW
BLACK
BROWN
ORANGE
U XOUT
U YOUT
GRAY
Output
Ground
Electrical interfaces
RED
1
VCC
12-35VDC
ORANGE
8
U XOUT
BLACK
3
GND
GREEN
4
RXD
YELLOW
5
TXD
9
U YOUT
BROWN GRAY
Output
Ground
10
Cable color
&
Function
RS232 Electrical interfaces
RED
1
VCC
9-35VDC
BLUE
2
NC
BLACK
3
GND
GREEN
4
B
RXD
YELLOW
5
A
TXD
Cable color
&
Function
1
5
4
3
Sensor
POWER+ POWER-
YELLOW: TXD
RED DC 12-35V 1
6
7
8
9
3
2
4
5
POWER
GREEN: RXD
BLACK: GND
12~35V
12
3
4
5
67

Bewis Sensing Technology LLC www.bwsensing.com Tel：[phone]
BWM420
Voltage Output Dual Axis Inclinometer
Debugging Software
You can download the serial debugging assistant directly on the official website
(technical service -> download area), or you can use the more convenient and intuitive host
computer software.
BWM420 supporting serial port debugging software can connect the tilt sensor on the
computer to display the angle. The software debugging interface is shown in the figure
below. Using the tilt angle to debug the host computer, you can conveniently display the
current X and Y direction tilt angle, and you can also modify and set other parameters.
Steps:
①Correctly connect the serial port hardware of the inclinometer and connect the power
supply.
②Select the computer serial port and baud rate and click to connect to the serial port.
③Click start, the current tilt angle of the inclinometer in the X and Y direction will be
displayed on the screen.

Bewis Sensing Technology LLC www.bwsensing.com Tel：[phone]
BWM420
Voltage Output Dual Axis Inclinometer
Model Communication code
Package situation
BWM420-90-05 RS485 IP67 Package/Metal joint
BWM418-90-010 RS232 IP67 Package/Metal joint
●Enterprise Quality System Standard: ISO9001:2015 Standard (Certificate No.064-
21-Q-3290-RO-S)
●CE certification (certificate number: M.2019.103. U Y1151)
●ROHS (certificate Number: G 190930099)
●GB/T 191 SJ 20873-2003 General specification for inclinometer and level
●GBT 18459-2001 The calculation method of the main static performance index
of the sensor
●JJF 1059.1-2012 Evaluation and expression of measurement uncertainty
●GBT 14412-2005 Mechanical vibration and shock Mechanical installation of
accelerometer
●GJB 450A-2004 General requirements for equipment reliability
●GJB 909A Quality control of key parts and important parts
●GJB899 Reliability appraisal and acceptance test
●GJB150-3A High temperature test
●GJB150-4A Low temperature test
●GJB150-8A Rain test
●GJB150-12A Sand and dust experiment
●GJB150-16A Vibration test
●GJB150-18A Impact test
●GJB150-23A Tilt and rock test
●GB/T 17626-3A Radio frequency electromagnetic field radiation immunity test
●GB/T 17626-5A Surge (impact) immunity test
●GB/T 17626-8A Power frequency magnetic field immunity test
●GB/T 17626-11A Immunity to voltage dips, short-term interruptions and voltage
changes
Executive standard
Order information

Wuxi Bewis Sensing Technology LLC
Add：Building 30, NO. 58, Xiuxi Road, Binhu District,
Wuxi City, Jiangsu Province, China
Tel：[phone]
Mail：[email protected]
Web：www.bwsensing.com
BWM420 Series
Voltage Output Dual Axis
Inclinometer