DISPLACER LEVEL TRANSMITTER

  Summary

Our company has been developing and producing since 2006 After years of technical research and accumulation of experience, the product performance has reached the international leading level. Displacer level transmitter can be used to measure level, interface or density, output 4-20mA current signal, and have HART communication protocol. Through the compatible HART communicator, the level controller can be inquired, configured, calibrated or tested. It can also accept the information of a single measurement loop, and can transmit the information from the field to the control system.

Operating principle

 Displacer level transmitter is composed of level controller and measuring chamber, displacer, torque tube and other components. The change of the measured medium level causes the buoyancy of the float to change, and the change is transmitted to the torsion tube component, which makes the torsion tube rotate one angle with the mandrel synchronously. A sensing system coupled to the torsion tube mandrel generates a voltage signal. The level controller electronic assembly measures the level (interface) signal and provides a 4 to 20 mA current output. The microcontroller measures the ambient temperature to compensate for changes in liquid density caused by changes in process temperature, and the LCD displays information such as the analog output, process variables, process temperature (RTD installation required), torsion tube rotation angle, and percentage range of the level (interface).

Technical Parameters

Power supply: 12~30V DC; with reverse-polarity protection. (When HART communication is used, the voltage of controller should be larger or equal to 17.75V DC）

Output: 4～20mA DC+HART (Positive effect - increased output due to increased level, interface or density; or negative effect - decreased output due to increased level, interface or density)

Range: 300mm - 2500mm (to order; customized design if out of range) Nominal pressure: ≤42.0MPa(Class2500)

Nominal diameter: DN40 or to order

Ambient temperature: -40 ºC to +80 ºC (When ≤ -20 ℃, LCD no display, remote transmission can be used normally.)

Medium temperature:－196℃≤T≤+450℃ Accuracy: 0.5

Influence by power supply: When the voltage of the power supply varies between min. and max. ,the output change is within ＜±0.2  of the output range.

LCD display: Output current signal, process variable, process temperature, percentage range, rotation angle of torque tube.

Density:0.2≤ρ≤1.9g/cm3

Medium density difference: ≥0.04g/cm³

Torque tube material: Standard configuration Inconel 600, or Monel, HasetlloyC-276 Chamber material: CS, 304, 316 or as customer required.

Displacer material: 304,316 or as customer required.

Flange standard: HG/T20592-2009、HG/T20615-2009 or on request Power inlet: Two M20×1.5 (female) or on request

Hazardous Area Explosion-proof:

IECEx Ex ia ⅡC T5 Ga；Ex d ⅡC T5/T6 Gb. TUV Ex ia ⅡC T5 Ga；Ex d ⅡC T5/T6 Gb. PCEC Ex ia ⅡC T5 Ga；Ex d ⅡC T5/T6 Gb. Functional safety: SIL 2

IP Rating: IP66

Alarm configuration: For the self-diagnosis to the inaccuracy failure of the process variables (for example, the electronic module failure). Configure the process variables for high and low alarms.