1. Description

The Rosemount 3100 Series is a liquid level transmitter based on ultrasonic technology that is suitable for many liquid applications. Ultrasonic pulse signals are transmitted and reflected from the liquid surface. The transmitter ‘listens’ for reflected signals (echoes) and measures the time-delay between transmitting and receiving. The distance to the liquid surface is automatically calculated using the computed time-delay.

The transmitter then calculates the liquid depth (level) and outputs the level as a 4–20 mA signal (and a digital HART® signal on the Rosemount 3102 and 3105). The Rosemount 3102 is used for measuring the level only.

The Rosemount 3102 and 3105 can calculate distance-to-surface, contents (volume), or open channel flow, and then output the result as a 4–20 mA signal and a digital HART signal.

An integral temperature sensor continuously measures the air temperature around the transmitter. It then computes the speed of sound in air, automatically compensating the calculated distance for temperature effects. The Rosemount 3102 and 3105 have a remote temperature sensor option.

2. Features

• Measures liquid height, distance to liquid, volume, or flow in open channels
• Eliminates problems experienced with contacting instrumentation
• Simple set-up and operation with an integral LCD display and buttons
• Low cost of installation and commissioning. Minimal maintenance after installation
• Process downtime minimized
• Non-contacting measurement with no moving parts
• Two integral signal relays (on the 3102 only)
• Corrosion-resistant PVDF wetted material
• Two-wire 24 V direct current loop-powered
• Operating range up to 36 ft. (11 m)
• Automatic temperature compensation

3. How to Order