Single Axis, Narrow Angle, Low Current, Electrolytic Tilt Sensor0 pages

DATA SHEET

`

Operating Specifications

Description
The 0711-0763-99 Sensor has been used successfully in
applications that demand a high accuracy for small angle
ranges and excellent null repeatability. The sensor offers
excellent stability over time and wide range of temperatures.
The hermetic glass to metal construction and solid platinum
(platinized) electrodes guarantee a long operating life and
stable operating characteristics.
Angle Range
Resolution
Null Repeat

1
1 arc sec.
3-arc sec.

Applications Include
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Construction Laser Instruments and Transits
Aircraft Avionics
Geophysical Monitoring
Machine Tool Leveling
Medical Positioning and Monitoring

Physical Dimensions
Vial length
Vial diameter
Lead length

1
Operating Range (max.)
Linear Range
± 5 arc minute
Null Voltage
≤0.005 Volts
Null Current(max.)
0.5 mA (continuous)
Null Impedance (nom)1
21K Ohms (25°C)
(measured left to right electrode)see fig. 2
Null Repeatability
< 3 arc seconds
Resolution
< 1 arc second
Symmetry (typ)
< 20 %
-20 C to +50 C
Operating Temperature
-50 C to +100 C
Storage Temperature
Time Constant (1) 2
< 500 msec
Materials
non-magnetic
± 0.5 arc seconds / C
Temperature coefficient
at null (when properly mounted)
1

2

Impedance of the electrolyte may be changed to limit null
current
Viscosity of the electrolyte may be modified to meet
individual requirements to reduce vibration

1.25” (31.7mm)
0.281” (7.1mm)
0.125” (3.1mm)

OUTPUT SENSITIVITY Figure 1
100

Sensor Test Circuitry
PERCENT OUTPUT

80

Tests were conducted by exciting the left and right electrodes
with an AC signal of 400 Hz and an rms voltage to produce the
maximum current at null as per operating specifications. Output
readings are taken between the center electrode and the center
of the balanced resistors R1 and R2. Tests were conducted at a
temperature of +25 C. See sensor test circuitry in figure 3.
Output curve is shown in figure 1.

60
40
20
0

Descrition of Test Values

-60

AC input voltage = Null
Current (max) times Null
Impedance (nom)

R1 =R2 = ½ Null Impedance
(nom)
Caution!-Ensure that all test and operating circuits are
entirely free of direct current. Direct current will cause level
damage and/or instability.

-30
-15
0
15
TILT ANGLE (arc minutes)

30

45

60

IMPEDANCE / TEMPERATURE Figure 2

40
IMPEDANCE (Kohms)

Eout = Angle of tilt from null
(Direction of tilt
determined by phase of
Eout)

-45

30
20
10
0
-20

-10
0
10
20
30
40
TEMPERATURE (degrees C)`

The Fredericks Company l 2400 Philmont Ave ● HuntingdonValley, PA 19006-0067
Tel: 215.947.2500 l Fax: 215.947.7464 l Email: sales@frederickscom.com l www.frederickscom.com
0711-0763-99data sheet Revision: A

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