Device Nomenclature

1. PIxxx is a Pressure Indicator;
2. LLxxx is a Liquid Level indicator;
3. FIxxx is a Flow Indicator;
4. TDxxx (also TRxxx or TIxxx) is a Temperature sensing Diode, Resistor or Indicator;
5. MVxxx is a Manually-operated Valve;
6. EVxxx is an Electric control Valve;
7. SVxxx is a Solenoid Valve;
8. PVxxx is a Pneumatic Valve;
9. MPxxx is a Mechanical Pump;
10. OVPxxx is a Oil Vapor Pump (i.e. diffusion pump).