The A135PT Position Transmitter is used to detect and measure linear position and displacement, primarily of slide gates with a high degree of accuracy and repeatability. TheA135PT can be mounted in any position with the cable attached to the moving gate and the housing attached to a fixed surface.
An internal spring maintains constant tension on the cable for retracting it onto the pulley and the shaft is normally coupled to a three (3) turn potentiometer.
The A135PT provides a voltage, usually 0 to 5 volts DC, proportional to the linear extension of the cable for display purposes and /or input to a controller such as the A153C, A158GC, programmable controllers and process computers. The unit has provisions to utilize different terminal connections to provide either 0-5 volt or 5-0 volt DC signal upon extension or retraction of the cable connecting to the gate.
Two options are available as shown below. Option "A" is the most common with a 5K ohm potentiometer and a 1K ohm current limiting series resistor. Option "B" has a 1K ohm potentiometer and a 2K ohm span adjustment potentiometer. Both units have a linearity of .25%.
The A135PT housing is explosion proof and dust tight for Class 1, Group D, Class II, Groups E, F, and G; NEMA 7 and 9.
The A135PT is available in 3 models, based on the pulley diameter and maximum travel:
A135PT - 2.5" for up to 23" travel