Hedland manufactures one and two-relay flow switches suppliers as well as analog-output flow transmitters. Switch options include SPDT, SPST-NO, and SPST-NC. Flow industrial transmitters include a field-selectable 4-20 mA, 0-5 Vdc and 0-10 Vdc analog output. The flow switches and transmitters are available for almost all mediums including oil, air and other gases, and water and other liquids. Accuracy of +/-2% of full scale. Port sizes from 0.5 to 1.25", available with SAE, BSP or NPT threads. Special professional scales available.