Delta Controls specializes in LEVEL measurement instruments for measuring fluid levels and solid levels.

Delta manufactures ultrasonic level transmitters, flowmeters, pump controls, float and displacer actuated switches suitable for almost any application.  Shown is Model 872, Delta's two-wire loop powered Ultrasonic Level Transmitter.

Rosemount Inc. - Liquid Level Transmitters

The Model 1151LT  is a flange-mounted transmitter for level and specific gravity measurements in tanks.

• Compatible with any two-wire system
• Ranges from 0–25inH₂ O to 1–100 PSI (0–6.2 KPa to 0–690 KPa)
• Many diaphragm and flange options to fit all process and installation requirements

The Model 3051L provides precision level and specific gravity measurement for a wide variety of tank configurations. Based on the proven capacitance cell technology pioneered by the Rosemount Model 1151, the Model 3051L is designed for applications requiring the highest levels of accuracy and performance, such as inventory control, material balance, and head box.

• Many diaphragm and flange options to fit all process and installation needs
• Compact and lightweight for easy installation and maintenance
• Remote seal option provides flexible measurement capability
• 0.075% of span accuracy and 100:1 rangeability

ABB Instrumentation manufactures Chart Recorders, Process Controllers, and Digital Indicators to measure and control liquid level.   

ABB offers proven solutions for measuring the level of liquids in open, closed and pressurized vessels within hazardous and non-hazardous areas.  Shown is the Model PR100 strip chart recorder.