Liquid Tank Level Measurement

Diaphragm and Bellows type instruments are versatile choices suitable for serving as liquid tank level indicators, offering reliable measurements in various industrial applications. The mechanism is straightforward: the high-pressure port effectively links to a tap positioned at the tank’s bottom, while the low port is securely connected to the atmosphere, enabling accurate and efficient level sensing. This configuration ensures precise readings and provides valuable insights into liquid storage tank levels, facilitating proper monitoring and control of tank contents for optimal operations and enhanced safety.

How To Measure The Liquid Tank Level

A differential pressure instrument serves as a versatile and effective solution for measuring liquid levels based on the concept of head. One of the instrument’s notable advantages is its adaptability to accommodate various units of measurement, catering to the user’s specific requirements, whether in millimeters, inches of water, pounds, CO2, or other units, thereby enhancing its applicability across diverse industries.

For open tanks, achieving accurate level measurements necessitates installing the differential pressure instrument at the bottom of the tank. This strategic placement ensures that the instrument gauges the liquid level precisely, considering the hydrostatic pressure exerted by the liquid column above it.

However, in scenarios where tanks are closed or subject to pressurization, a different approach is employed. Here, the low-pressure port of the differential pressure instrument can be thoughtfully connected to the top of the liquid storage tank, as illustrated in the accompanying figure. Despite the variation in pressure dynamics between open and closed tanks, the liquid inside will exhibit similar head characteristics. This means that the differential pressure instrument will continue to deliver reliable and accurate readings, ensuring a precise indication of the liquid level within the tank.

The flexibility and adaptability of the differential pressure instrument in handling diverse tank configurations underscore its importance as a valuable tool in industrial processes and applications where liquid level monitoring is critical. By providing users with a comprehensive and customizable solution, this instrument enables seamless integration into existing systems, optimizing efficiency, safety, and operational effectiveness across various industries and settings.

More Information

Watch this video by RealPars for a visual demonstration and Find a distributor to get the right instrument you need for liquid tank level measurement.

Liquid storage tank

Recommended Models:

Model No. Differential Pressure Range Accuracy Working Pressure Electrical Available Specifications Installation/ Operation Manual Electrical IOM Drawing
Model 105 0-10" H2O (0-0.4 PSID) to 0-79.9" H2O (0-2.9 PSID) ±1/2% or 1%
Note:
1/2% Full Scale available 30" H2O & above
Up to 6,000 PSI LOCKED LOGIC SWITCHES
NEMA 4X, Class I Division I, GROUP. B, C & D, Class II Division I, GROUP. E, F & G
Model 106 0-80" H2O (0-3 PSID) to 0-800" H2O (0-30 PSID) ±1/2 or ±1% Up to 6,000 PSI LOCKED LOGIC SWITCHES
NEMA 4X, Class I Division I, GROUP. B, C & D, Class II Division I, GROUP. E, F & G
MICRO SWITCHES
0-80" H2O to 0-800" H2O, CSA LISTED IND. CONT. EQUIP.
Model 109 0-15 PSID to 0-6000 PSID (Dependent on Body Material and Safe working Pressure) 1/2% or 1% Full Scale
(1/2% Not available above 1,000 PSID or Bi-Directional Ranges)
NOTE:
Bi-Directional Accuracy is 1% Total Span
±3% Total Span
(For Ranges above 1,500-0-1,500 PSID)
Up to 6,000 PSI LOCKED LOGIC SWITCHES
Weather-proof Housing, NEMA 4X, Class I Division I, GROUP. B, C & D, Class II Division I, GROUP. E, F & G
Model 115 0-10" H2O to 0-69.9" H2O
Tank Level Applications
±1% 500 PSI (Optional 1,000 PSI) None available N/A
Model 116 0-70" H2O to 0-800" H2O
Tank Level Applications
±1% 500 PSI (Optional 1,000 PSI) MICRO SWITCHES
0-80" H2O to 0-800" H2O NEMA 4X, CSA LISTED IND. CONT. EQUIP.
Model 114 0-0.72 PSID (0-20" H20) to 0-20 PSID (0-600" H2O)
Tank Level Applications
±2% 1000 PSI CE / LVD, RoHS Compliant, NEMA 4X, 4-20mA Transmitter
Model 142 0-20" H2O to 0-25 PSID ±3/2/3% Up to 3,000 PSI CE / LVD, RoHS Compliant, NEMA 4X, Terminal Strip, Class 1-Div. 2, 4-20mA Transmitter
Model 140 0-50" H2O to 0-100 PSID 0-50" H2O to 0-399" H2O
±5%
0-15 PSID to 0-100 PSID
±3/2/3%
Up to 3,000 PSI CE / LVD, RoHS Compliant, NEMA 4X, Terminal Strip, Class 1-Div. 1, Class 1-Div. 2, 4-20mA Transmitter
Model 700 / 710 / 715 0-5 PSID to 0-300 PSID ±0.50% 2,900 PSI 2-Wire
4-20 mA Transmitter 15-28 VDC, LCD = 4-20 mA Transmitter 18-28 VDC, LED = 4-20 mA Transmitter 20-28 VDC
3 Wire
15-28 VDC/1-5 VDC, 15-28 VDC/0-5 VDC, 15-28 VDC/0-10 mADC, 15-28 VDC/0-20 mADC, 15-28 VDC/0-10 VDC
N/A