1. General Introduction
Rosemount 2120 vibrating fork level switch is a popular choice for high and low level alarm and pump control duties needs no calibration. A piezo-electric crystal oscillates the forks at their natural frequency. Changes to this frequency are continuously monitored. The frequency of the vibrating fork sensor changes depending on the medium in which it is immersed. The denser the liquid, the lower the frequency.
When used as a low level alarm, the liquid in the tank or pipe drains down past the fork, causing a change of natural frequency that is detected by the electronics and switches the output state. When the Rosemount 2120 is used as a high level alarm, the liquid rises in the tank or pipe, making contact with the fork which then causes the output state to switch.
2. Basic code selection of 2120 vibrating fork level switch
2120 | Vibrating Fork Liquid Level Switch /–40...150 °C | ||||||||
Material of construction | D | 316/316L Stainless Steel (1.4401/1.4404) dual certified | |||||||
F | ECTFE copolymer, coated 316/316L SST (1.4401/1.4404) | ||||||||
C | Alloy C (UNS N10002), Alloy C-276 (UNS N10276), Solid | ||||||||
Process connection | 0A | 3/4-in. BSPT (R) Thread | |||||||
0B | 3/4-in. BSPP (G) Thread | ||||||||
0D | 3/4-in. NPT Thread | ||||||||
1A | 1-in. BSPT (R) Thread | ||||||||
1B | 1-in. BSPP (G) Thread | ||||||||
1D | 1-in. NPT Thread | ||||||||
2D | 2-in. NPT Thread | ||||||||
1P | 1-in. BSPP (G), O-ring | ||||||||
5R | 11/2-in. (38 mm) Tri Clamp | ||||||||
2R | 2-in. (51 mm) Tri Clamp | ||||||||
8Q | Mobrey A Flange | ||||||||
9Q | Mobrey G Flange | ||||||||
1G | 1-in. ASME B16.5 Class 150 Raised Face (RF) Flange | ||||||||
1H | 1-in. ASME B16.5 Class 300 Raised Face (RF) Flange | ||||||||
1J | 1-in. ASME B16.5 Class 600 Raised Face (RF) Flange | ||||||||
5G | 11/2-in. ASME B16.5 Class 150 Raised Face (RF) Flange | ||||||||
5H | 11/2-in. ASME B16.5 Class 300 Raised Face (RF) Flange | ||||||||
2G | 2-in. ASME B16.5 Class 150 Raised Face (RF) Flange | ||||||||
2H | 2-in. ASME B16.5 Class 300 Raised Face (RF) Flange | ||||||||
3G | 3-in. ASME B16.5 Class 150 Raised Face (RF) Flange | ||||||||
3H | 3-in. ASME B16.5 Class 300 Raised Face (RF) Flange | ||||||||
4G | 4-in. ASME B16.5 Class 150 Raised Face (RF) Flange | ||||||||
4H | 4-in. ASME B16.5 Class 300 Raised Face (RF) Flange | ||||||||
Electronic type | T | Direct load switching | |||||||
G | PNP/PLC (3-wire) 20 to 60 Vdc | ||||||||
V | Relay DPCO, 20 to 264 Vac 50/60Hz, 20 to 60 Vdc | ||||||||
E | Relay DPCO, 9...30 Vdc | ||||||||
K | NAMUR | ||||||||
H | 8/16 mA | ||||||||
Surface finish | 1 | Standard surface finish | |||||||
2 | Hand polished (Ra < 0.4 μm) | ||||||||
3 | Ra < 0.76 μm, hygienically approved | ||||||||
4 | Electro-polished to 0.76 μm | ||||||||
7 | Mechanically-polished to Ra < 0.1 μm | ||||||||
8 | Electro-polished to Ra < 0.38 μm | ||||||||
Product certifications | NA | No Hazardous Locations Certifications | |||||||
E1 | ATEX Flameproof | ||||||||
E3 | NEPSI Flameproof | ||||||||
E5 | FM Explosion-proof | ||||||||
E7 | IECEx Explosion-proof | ||||||||
I1 | ATEX Intrinsic Safety | ||||||||
I3 | NEPSI Intrinsic Safety | ||||||||
I5 | FM Intrinsic Safety | ||||||||
I7 | IECEx Intrinsic Safety | ||||||||
Housing | A | Glass Filled Nylon, M20 conduits/cable threads | |||||||
D | Glass Filled Nylon, 1/2-in. ANPT conduits/cable threads | ||||||||
X | Aluminum Alloy, M20 conduits/cable threads | ||||||||
Y | Aluminum Alloy, 3/4-in. ANPT conduits/cable threads | ||||||||
S | Stainless Steel, M20 conduits/cable threads | ||||||||
T | Stainless Steel 3/4-in. ANPT conduits/cable threads | ||||||||
Fork length | A | Standard length 1.7 in. (44 mm) | |||||||
H | Standard length flange 4.0 in. (102 mm) | ||||||||
E | Extended, customer specified length in tenths of inches | ||||||||
M | Extended, customer specified length in millimeters | ||||||||
Specific extended fork length | 0000 | Factory default length (only if Fork Length A or H is selected) | |||||||
XXXX | Specific customer specified length in tenths of inches or millimeters (XXX.X inches or XXXX mm) | ||||||||
Optional codes | Optional codes [ As per table below] |
3. Typical mounting & dimensions for 2120 vibrating fork level switch
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