VRLC3144LD Intelligent Displacer Liquid Level Transmitter - VRLC3144LD

VRLC3144LD Intelligent Displacer Liquid Level Transmitter

Based on the Archimedes’s principle VRLC3144LD Intelligent Displacer Liquid Level Transmitter series is designed for measurement of liquid level, interface and density. Featured by high measuring stability, it is especially suitable for level (interface) measurement of a liquid under field conditions of small measuring range, high temperature and high pressure, and low density. With HART protocol, it can be configured and monitored remotely by a PC or a hand – hold terminator and also can be operated by a regular built – in keypads.

Structure principle

VRLC3144LD Intelligent Displacer Liquid Level Transmitter is mainly composed of a buoyancy chamber, displacer, a torque tube and an electric measurement unit. Displacer buoyancy is transmitted by the displacer and torque tube to the working rod connected to a sensor, and then acts on a free end of the sensor. The four strain – measuring elements with meal film are splashed to the sensor, where the resistance value varies with a pulling force and a pressure force. They form a Wheatstone bridge powered by an electric amplifier, by which a diagonal bridge voltage that is proportional to the actual weight, as an input signal, is converted to wire signal output 4 – 20mA.

Main technical parameters

Measuring range:300~3000mm

Precision: liquid level ±0.5%FS,interface±1%FS

Repeatability:≤±0.25%FS

Dead zone:≤±0.2%FS

Power:12~30VDC

Output: analog 4~20mADC; Digital HART 1200 frequency shift keying (FSK)

LDC display: analog or level, interface and percentage

Load resistance:700Ω(24VDC)

Density difference min.: 0.05 g/cm3

Operating pressure: 2.5~32.0MPa

Temperature: normal -40~150°C; high temperature: 150~350°C

Ambient temperature: -40~80°C

Working conditions influence:

Power supply:output change≤±0.2%FS when voltage changes between minimum and maximum values

Temperature: output change <±0.03%FS/°C from -40°C to 80°C

Alarm current:trouble alarm current 3.8 mA or 22.8mA (as set) as level is below 10% of the lower limit of measuring range or above 10% of upper limit of the measuring range.

Enclosure classification: IP65 (NEMA 4X

Protection classification: intrinsically safe ExiaIICT1~T6; explosion proof ExdIICT1~T6

Electrical entry: two 1/2-14NPT female threads

Process connection:internal displacer DIN or ANSI flange DN80 or 3″above; external displacer HG20592~20635-97 DN20 and above flange. Other flanges are available upon request (such as GB, JB/T, HGJ, ANSI, DIN and etc.)

Wetted material:displacer 304, 316; chamber carbon steel, 304 and 316; torque tube 316

Terminal box material:aluminum alloy

Photo of workshop