Electrolytic Tilt Sensor Terms & Definitions

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Electrolytic Tilt Sensor
Terms & Definitions

Impedance at Null	Fluid impedance expressed in ohms between active electrodes and common electrode with level null position under standard test conditions.
Linearity	Variation around the best straight line from null to full-range output.
Maximum Operating Temperature Range	Maximum temperature range over which level may be operated without failure.
Null Current	AC current per leg as measured under standard test conditions with level in the electrical level position. Null currents shown are maximum; level performance improves as null current is reduced. For most levels and/or applications, currents of 100 to 500 microamperes are recommended.
Null Repeatability	Maximum variation in null voltage when level is displaced and returned to null position under standard test conditions.
Null Voltage	Minimum output as measured under standard test conditions with level in the electrical level position.
Operating Range	Angular displacement each side of null through which the level will operate at the maximum average sensitivity. Expressed in arc minutes or degrees.
Operating Temperature	Temperature range within which sensor will operate and not exceed 10% of typical operating specifications.
Output Curves	Output curves shown are standard. They can be varied widely by changing configuration, electrolyte or electrodes. Consult the factory for solutions to your specific requirements.
Output voltage	Values recorded at 30 seconds (time) after an angular deflection of the level.
Sensitivity	Change of output voltage per arc second, arc minute or degree of tilt. Expressed in graphic form using standard test conditions.
Standard Test Circuit	See below. See separate circuit for On-Off Switch.
Standard Test Frequency	400 Hz ±10 Hz usable from 25 Hz to well over 20 KHz.
Standard Test Temperature	+25°C (±1°C).
Symmetry	Maximum variation in output voltage when the sensor is tilted 50% of operating range each side of null under standard test conditions.

Standard Sensor Test Circuitry Bridge

The following 1k bridge test circuit was used to determine sensor output sensitivity figures in some legacy glass products. Tests were conducted at a temperature of +25°C using 12.5 Volts AC at 400 Hz. Not recommended for angle or TrueTILT Series Sensors.

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

Ratiometric Test Circuitry

The following ratiometric test circuitry was used to determine sensor output figures. (Recommended for all types of sensors.)

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.

AC input voltage = Null Current (max) X Null Impedance (nom)
Eout = Angle of tilt from null (Direction of tilt determined by phase of Eout)
R1 = R2 = ½ Null Impedance (nom)