Stand Alone Inclinometer
SCA115T and SCA125T Series
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
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
MEASURING DIRECTIONS
Negative incl., Zero position, Positive incl.
X-axis Y-axis
Positive incl., Zero position, Negative incl.
Earth’s gravity
Mounting position 1
(Horizontal)
Mounting position 2
(Vertical)
Mounting position 1
Mounting position 2
Deviation Deviation
Note 1. The measuring range is limited by the sensitivity and offset.
Note 2. Offset specified as Output @ 0°.
Note 3. The frequency response is determined by the sensing element’s internal gas damping.
The output has true DC (0Hz) response.
Note 4. The cross-axis sensitivity determines how much inclination, perpendicular to the measuring
axis, couples to the output.
Note 5. Mounting position should be calibrated. See measuring positions.
ELECTRICAL CHARACTERISTICS
Parameter Condition Min. Typ Max. Units
Supply voltage 7 16 35 V
Current consumption 20 mA
Output RS-485, half-duplex kΩ
Data transfer speed 11 bit word 10 Hz
PERFORMANCE CHARACTERISTICS
Parameter Condition SCA115T-D03 SCA125T-D06 SCA125T-D08 Units
Measuring range (1 ±30 ±90 ±30 °
Measuring axis (see “Directions”) X X-Y X-Y
Offset (2, 5 Output at 0°, HEX 03FF FS/2 FS/2 FS/2
Offset temperature error 0…70°C ±0.2 ±0.2 ±0.2 °
-25...85°C ±0,6 ±0,6 ±0,6 °
Resolution (5 @ 0° (offset position) 0,035 0,07 0,035 °/LSB
11 11 11 Bit/FS
Sensitivity Sine of inclination 30 90 30 °/FS
Sensitivity temperature error (5 0…70°C ±0,2 ±0,2 ±0,2 %
-25...85°C ±0,5 ±0,5 ±0,5 %
Nonlinearity Sinus output 0,1 N/A 0,1 °
Frequency response –3dB (3 18 18 18 Hz
Cross-axis sensitivity (4 4 4 4 %
Typical values @ ambient temperature unless otherwise specified.
Rev. 4 Jan 2005 VTI Technologies reserves the right to modify this specification without prior notice.
Single or dual axis RS-485 output
VTI Technologies Oy
Myllynkivenkuja 6
P.O. Box 27
FI-01621 Vantaa
Finland
Tel. +358 9 879181
Fax +358 9 87918791
sales@vti.fi
VTI Technologies Oy
Frankfurt Branch
Rennbahnstr. 72-74
D-60528 Frankfurt am Main
Germany
Tel. +49 69 6786 880
Fax +49 69 6786 8829
sales.de@vti.fi
VTI Technologies, Inc.
One Park Lane Blvd.
Suite 804 - East Tower
Dearborn, MI 48126
USA
Tel. +1 313 425 0850
Fax +1 313 425 0860
sales@vtitechnologies.com
Ø 4
Ø 4.2
SCA115T and SCA125T Series
Figure 2.
Figure 3.
Optional mounting bracket
Dimensions (in mm):
SENSOR DIMENSIONS ORDERING INFORMATION
MECHANICAL SPECIFICATION MOUNTING
Cable length: 30 cm The sensor module is to be mounted on a flat and smooth surface with 2 screws, dimension M4.
Mounting torque 5 ± 1 Nm.
Total weight: approx. 60 grams (excluding connector)
Protection class: IP66 (excluding connector)
Metal part: Housing: Yellow chromated zinc casting
Bracket: Yellow passivated steel
ELECTRICAL CONNECTION SOFTWARE LEVELS
Wire color Name Function Modules are available with different software levels:
Yellow A Bus connection Level Output
White B Bus connection A• Acc/Incl and temperature in counts (HEX data)
• Communication configurability (RS-485 bus)
• Device address changeability
Green NC
Blue GND Ground
Red Vcc Power supply B• “A” + output in mg, temperature in ˚F or ˚C
• Adjustable averaging of acc/incl signal(s)
• Adjustable offset for acc/incl signal(s)
C• “A” + “B” + output in mrad or degree
• Adjustable offset for acc/incl signal(s)
See separate manual for more detailed information
SCA1X5T-D0Y, Z
Software level:
A, B or C
Product type:
See Perf.char. table
Number of axis:
1=single axis, 2=dual axis
