Profile: PSM Instrumentation Limited manufactures transmitters. We provide electronic level, pressure, ultrasonic, process monitoring & control, flow sensors, bilge switches and electrical indicators. We are an ISO 9001:2000 certified company. Our APT 1000 hydrostatic level transmitter is used for marine tank gauging. This transmitter provides a reduced weight & size and takes full advantage of advancements in electronic design to provide accuracy and stability under varying operating temperatures. Body construction is all laser welded, eliminating any possibility of leaks, and all versions are suitable for full immersion to a minimum of 50M WG.