Rev. 3 / 1 Nov 2005

VTI Technologies reserves the right to modify this specification without prior to notice.

SCA111T and SCA121T Series

Stand Alone Inclinometer

FEATURES

• Silicon 3D MEMS sensor

• 0,1 ° accuracy

• Resolution < 0,001 °

• Operating temperature range -40...+85 °C

• Long term stability < 0,02 °

• Shock resistance >20 000 g

• Sensing element -3 dB @ 18 Hz

• Main dimensions: 30x30x13 mm size, single or dual axis

• Voltage output

• RoHS compatible

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)

Single or Dual Axis Analog Output

ELECTRICAL CHARACTERISTICS

Parameter

Condition

Min.

Typ

Max.

Units

Supply voltage

Unregulated or

regulated ratiometric

7

4.75

16

5

35

5.25

V

V

Applies to: -D02, -D03, -D07

Applies to: -D04, -D05

Current consumption

5mA

Output load

Resistive

10

k

Ω

Capacitive

20

nF

PERFORMANCE CHARACTERISTICS

Parameter

Condition

SCA111T-D02

SCA121T-D03

SCA121T-D07

SCA111T-D04

SCA121T-D05

Units

°

Supply voltage

7 ...35

7 ...35

7 ...35

5 ±0.25

5

±0.25

V

Measuring axis

(see “Directions”)

X

X-Y

X-Y

X

X-Y

Output at 0 °

2.5

2.5

2.5

2.5

2.5

V

Max. deviation

11111

°

Offset temperature error

0…70 °C

-25...85 °C

±0.2

±0.6

±0.2

±0.6

±0.2

±0.6

±0.2

±0.6

±0.2

±0.6

°

°

Sensitivity

Sine of inclination

70

35

70

35

35

mV/°(@offset pos.)

0…70 °C

-25...85 °C

-0.8 ...0.3

-1.5 ...0.5

-0.8 ...0.3

-1.5 ...0.5

-0.8 ...0.3

-1.5 ...0.5

-0.8 ...0.3

-1.5 ...0.5

-0.8 ...0.3

-1.5 ...0.5

%

%

Nonlinearity

Sinus output

0.1

N/A

0.1

N/A

N/A

°

18

18

18

18

18

Hz

33333

%

Typical values unless otherwise specified.

For customised product please contact VTI Technologies

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 (0 Hz) response.

Note 4

The cross-axis sensitivity determines how much inclination, perpendicular to the measuring

axis, couples to the output.

Note 5

For optimum zero point accuracy, mounting angle of the part can be adjusted.

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

Mounting position 1

(Horizontal)

X-axis

Y-axis

Negative incl.,

Zero position,

Positive incl.

Positive incl.,

Zero position,

Negative incl.

Earth’s gravity

Mounting position 2

(Vertical)

Mounting position 1

Mounting position 2

Deviation

Deviation