I/P Converter

Overall linearity of ±0.75% of span. The transducer can be mounted in any position and the range and zero adjustments are accessible from the front. The output signal is field-reversible by simply reversing the input leads. The GT210 is approved for hazardous area operation (Class 1, Div.1) and incorporates a pneumatic volume booster for fast actuation. 

In the direct acting mode, an increase in the input signal causes the coil to move away from the magnet which moves the flexure assembly toward the nozzle. This reduces the flow through the nozzle increasing the back pressure in the top chamber of the booster.

The increased pressure in the booster causes the diaphragm assembly to move downward, opening the pilot valve and increasing the output pressure.

The output pressure will continue to increase until it is equal to the nozzle back pressure and the forces on the diaphragm assembly are balanced.

A decrease in the input signal allows the coil to move toward the magnet which moves the flexure assembly away from the nozzle. This allows the flow through the nozzle to increase which reduces the back pressure in the top of the booster.

Since the output pressure is greater than the nozzle back pressure, there is a net upward force on the diaphragm assembly which causes it to move upward allowing the pilot valve to close and the relief port to close.

The excess output pressure is vented to atmosphere through the relief port until equilibrium is established. In the reverse acting mode, an increase in the input signal causes the coil to move toward the magnet instead of away from it since the direction of the current through the coil is reversed. An increasing signal, therefore, causes a proportionally decreasing output.