SCA115T Datasheet, PDF (1/2 Pages) VTI technologies – Stand Alone Inclinometer

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
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)
For customised product please contact VTI Technologies
ELECTRICAL CHARACTERISTICS
Parameter
Condition
Min.
Typ
Max.
Units
Supply voltage
Current consumption
Output
Data transfer speed
7
16
35
V
20
mA
RS-485, half-duplex
kΩ
11 bit word
10
Hz
PERFORMANCE CHARACTERISTICS
Parameter
Condition
SCA115T-D03
Measuring range ⁽¹
±30
Measuring axis
Offset ^{(2, 5}
(see “Directions”)
X
Output at 0°, HEX 03FF
FS/2
Offset temperature error
0…70°C
±0.2
Resolution ⁽⁵
-25...85°C
±0,6
@ 0° (offset position)
0,035
11
Sensitivity
Sine of inclination
30
Sensitivity temperature error ⁽⁵
0…70°C
±0,2
-25...85°C
±0,5
Nonlinearity
Sinus output
0,1
Frequency response –3dB ⁽³
18
Cross-axis sensitivity ⁽⁴
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.
SCA125T-D06
±90
X-Y
FS/2
±0.2
±0,6
0,07
11
90
±0,2
±0,5
N/A
18
4
Note 4.
Note 5.
SCA125T-D08
±30
X-Y
FS/2
±0.2
±0,6
0,035
11
30
±0,2
±0,5
0,1
18
4
Units
°
°
°
°/LSB
Bit/FS
°/FS
%
%
°
Hz
%
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
Y-axis
Mounting position 1
(Horizontal)
Mounting position 1
Mounting position 2
(Vertical)
Mounting position 2
Deviation
Negative incl.,
Zero position,
Positive incl.
Deviation
Positive incl.,
Zero position,
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
Negative incl.
Earth’s gravity
Rev. 4 Jan 2005
VTI Technologies reserves the right to modify this specification without prior notice.