All Industrial FAQ

The letters LVDT are an acronym for Linear Variable Differential Transformer, a common type of electromechanical transducer that can convert the rectilinear motion of an object to which it is coupled mechanically into a corresponding electrical signal. LVDT linear position sensors are readily available that can measure movements as small as a few millionths of an inch up to several inches, but are also capable of measuring positions up to ±20 inches (±0.5 m).

1. Will an API 4000 G work with an input temperature range of 1000 to 2000°F?
Yes, however to utilize the charts for selecting the switch positions in the field, we need to convert °F to °C. This would give 550°C to 1100°C which can be selected from the charts.

1. Do you have a temperature differential unit that will measure a difference of 10° C between the two inputs?
Yes, the API 4001 G SA-B, but the two RTDs will require very precise matching (±0.1%) and it would be helpful to know the operating temperature point so the factory can calibrate the unit precisely.

1. Are the API LPI-1 and the API LPI-2 UL recognized or listed?
No. These should not be required for UL listing since the operating current and voltage are below the covered standards.

2. We have an API DPI-2. Can we have an input of 0-20 mA and an output of 0-20 mA?
No. The loop powered device requires a minimum of 4 mA to supply power to the module.