Rosemount 2120 Vibrating Fork Liquid Level Switch

Rosemount 2120 Vibrating Fork Liquid Level Switch

Quick Detail:

1-The fully featured 2120 is ideal for almost all liquid applications

2-Wide choice of materials of construction

3-Complete range of process connections

4-Four switching mechanisms configurable for your application

5-Electronic self-checking and condition monitoring

6-Mode select ⁄ user adjustable time delay switch

7-SIL 2 suitable

Description:

The Rosemount 2120 is based on vibrating short fork technology, making it suitable for virtually all liquid applications. Features include a complete range of process connections, wide choice of housing and wetted parts materials, four different switching functions, extended fork lengths, hazardous area, basic self-checking functionality, and overfill approvals. The 2120 can withstand temperatures up to 302 °F (150 °C) and pressures to 1450 psig (100 barg). This combination of features makes it configurable to almost all requirements.

1-Function virtually unaffected by flow, turbulence, bubbles, foam, vibration, solids content, coating, properties of the liquid, and product variations

2-No need for calibration and requires minimum installation procedures

3-Easy terminal access, polarity insensitive and short circuit protection

4-No moving parts or crevices means virtually no maintenance

5-Basic electronic self-checking functionality

6-Visible Heartbeat LED shows device status

7-Adjustable Switching Delay for turbulent ⁄ splashing applications

8-Local Magnetic Test Point makes functional test easy

9-Small in size and weight, short fork length up to 118-in. (3 m)

10- "Fast Drip" Fork Design gives quicker response time especially with viscous liquids

11-General area, Explosion ⁄ Flameproof, and Intrinsically Safe options

Applications:

Rosemount 2120 can be used for point level measurements on liquids in most processes and most industries. Applications include:

Overfill protection

High and low level alarm

Pump control ⁄ limit detection

Pipe installation (pump protection)

Hygienic applications

Wireless applications (when used in conjunction with The Rosemount 702)

Vessel leak detection

Water ingress detection

Rosemount 2120 Application and Mounting Examples
For most liquids including coating and aerated liquids and slurries, the function is virtually unaffected by flow, turbulence, bubbles, foam, vibration, solid particles, build-up (avoid bridging of forks) or properties of the liquid. For use in Hazardous (IS or Exd) or safe area and process temperatures up to 302°F (150°C).Mount in any position in the tank or pipe. Mounting is by a wide range of threaded, flanged, or hygienic connection.

Application Considerations:
• Ensure liquid is inside the temperature and pressure ranges (see specifications).
• Check that the liquid is inside recommended viscosity range 0.2 to 10,000 cP.
• Examples of products with too high of viscosity are chocolate syrup, ketchup, peanut butter and bitumen. The switch will still detect these products but the drain time can be very long.
• Check that the liquid density is above 37.5 lb/ft 3(600 kg/m3).
• Examples of products with too low of density are acetone, pentane and hexane.
• Check for risk of build-up on the forks.
• Avoid situations where drying and coating products may create excessive build-up.
• Ensure no risk of bridging the forks.
• If coating, bridging may occur ensure the Halar/PFA coated version is used to reduce the risk of build-up.
• Examples of products that can create bridging of forks are dense paper slurries and bitumen.
• Check the solids content in the liquid.
• Problems may occur if product coats and dries causing caking.
• As a guideline maximum solid particle diameter in the liquid is 0.2-in. (5 mm).
• Extra consideration is needed when dealing with particles bigger than 0.2-in. (5 mm), consult factory.
• Foam
• In almost all cases the 2120 is insensitive to foams (do not see the foam as a liquid).
• However in rare occasions some very dense foams may be seen as liquid, known example of this is found in ice-cream and orange juice manufacturing.

Specifications:

Competitive Advantage:

1-Function virtually unaffected by flow, turbulence, bubbles, foam, vibration, solids content, coating, properties of the liquid, and product variations

2-No need for calibration and requires minimum installation procedures

3-Easy terminal access, polarity insensitive and short circuit protection

4-No moving parts or crevices means virtually no maintenance

5-Basic electronic self-checking functionality

6-Visible Heartbeat LED shows device status

7-Adjustable Switching Delay for turbulent ⁄ splashing applications

8-Local Magnetic Test Point makes functional test easy

9-Small in size and weight, short fork length up to 118-in. (3 m)

10- "Fast Drip" Fork Design gives quicker response time especially with viscous liquids

11-General area, Explosion ⁄ Flameproof, and Intrinsically Safe options