SCA115T and SCA125T Series
Stand Alone Inclinometer
Single or dual axis RS-485 output
FEATURES
• Silicon 3D MEMS sensor
• RS-485 serial interface
• 11 bit resolution
• Operating temperature range -40...+85°C
• Inclination and temperature output
• Long term stability < 0,02°
• Shock resistance >20 000g
• 30x30x13mm size, single or dual axis
• Horizontal or vertical mounting
For customised product please contact VTI Technologies
BENEFITS
• Excellent long term stability
• Sensing element controlled frequency response
• Outstanding shock durability
• Harsh environment robustness
APPLICATIONS
• Platform tilt measurement
• Equipment and instrument condition monitoring
• Inclination based position measurement
• Rotational orientation measurement (dual axis)
ELECTRICAL CHARACTERISTICS
Parameter
Supply voltage
Current consumption
Output
Data transfer speed
RS-485, half-duplex
11 bit word
10
Condition
Min.
7
Typ
16
20
Max.
35
Units
V
mA
kΩ
Hz
PERFORMANCE CHARACTERISTICS
Parameter
Measuring range
(1
Measuring axis
Offset
(2, 5
Offset temperature error
Resolution
(5
Sensitivity
Sensitivity temperature error
(5
Nonlinearity
Frequency response –3dB
Cross-axis sensitivity
(4
(3
Condition
(see “Directions”)
Output at 0°, HEX 03FF
0…70°C
-25...85°C
@ 0° (offset position)
Sine of inclination
0…70°C
-25...85°C
Sinus output
SCA115T-D03
±
30
X
FS/2
SCA125T-D06
±
90
X-Y
FS/2
SCA125T-D08
±
30
X-Y
FS/2
Units
°
±
0.2
±
0,6
0,035
11
30
±
0.2
±
0,6
0,07
11
90
±
0.2
±
0,6
0,035
11
30
°
°
°/LSB
Bit/FS
°/FS
%
%
°
Hz
%
±
0,2
±
0,5
0,1
18
4
±
0,2
±
0,5
N/A
18
4
±
0,2
±
0,5
0,1
18
4
Typical values @ ambient temperature unless otherwise specified.
Note 1.
Note 2.
Note 3.
The measuring range is limited by the sensitivity and offset.
Offset specified as Output @ 0°.
The frequency response is determined by the sensing element’s internal gas damping.
The output has true DC (0Hz) response.
Note 4.
Note 5.
The cross-axis sensitivity determines how much inclination, perpendicular to the measuring
axis, couples to the output.
Mounting position should be calibrated. See measuring positions.
MEASURING DIRECTIONS
X-axis
Mounting position 1
(Horizontal)
Y-axis
Mounting position 1
Mounting position 2
Mounting position 2
(Vertical)
Earth’s gravity
Deviation
Negative incl.,
Zero position,
Positive incl.
Deviation
Positive incl.,
Zero position,
Negative incl.
Figure 1. Positions
Notes:
• It is important that the part is parallel to the mounting plane, and that the output equals the zero value when sensor is in zero position.
• Zero position: Please note the picture above which provides information on how the output of the accelerometer behaves in different
circumstances when assembled. Please also note that you can rotate the part around the measuring plane for optimum mounting location
Rev. 4 Jan 2005
VTI Technologies reserves the right to modify this specification without prior notice.
VTI [ VTI TECHNOLOGIES ]
