Glass Narrow Angle 0737-1201-990 pages

DATA SHEET

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Operating Specifications

Description
The 0737-1201-99 Sensor has been used successfully in
applications that demand ultra high accuracy, excellent null
repeatability, and a linear output. Long term stability over its
angle and temperature range is a distinctive characteristic of
this sensor. The hermetic glass to metal construction and
platinum (platinized) electrodes guarantee a long operating
life and stable operating characteristics.
Angle Range
Resolution
Null Repeat

15 arc min.
<0.05 arc sec.
< 0.5 arc sec.

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

Physical Dimensions
Vial length
Vial Diameter
Lead Length

15’
Operating Range (max.)
Linear Range
± 8’
Null Voltage
≤0.010 Volts
Null Current(max.)
5.0 mA (continuous)
Null Impedance (nom)1
1500 Ohms(25°C)
(measured left to right electrode) see fig 2
Null Repeatability
< 0.5 arc seconds
Resolution
< 0.05 arc seconds
Symmetry (typ)
≤20%
-20 C to +100 C
Operating Temperature
-50 C to +100 C
Storage Temperature
Time Constant (1)2
< 500 msec
Materials
non-magnetic
Temperature Coefficient
0.05%/°C
at null when properly mounted
1

Impedance of the electrode may be changed to limit null
current.
2

Viscosity of the electrolyte may be modified to meet
individual requirements for time constant or vibration.

1.06” (26.9mm)
0.320” (8.13mm)
15.0” (381mm)

OUTPUT SENSITIVITY Figure 1
100

Sensor Test Circuitry
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.

PERCENT OUTPUT

80
60
40
20
0
-15

-10

-5
0
5
TILT ANGLE (arc minutes)

10

15

Descrition of Test Values
AC input voltage = Null
Current (max) times Null
Impedance (nom)

IMPEDANCE/TEMPERATURE
Figure 2

Eout = Angle of tilt from null
(Direction of tilt
determined by phase of
Eout)
R1 =R2 = ½ Null Impedance
(nom)

IMPEDANCE Ohms)

5000
4000
3000
2000
1000
0

Caution!-Ensure that all test and operating circuits are
entirely free of direct current. Direct current will cause level
damage and/or instability.

-20

-10

0
10
20
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
0737-1201-99data sheet Revision: B

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