Differential Scale Loop

For Evaluation of Scaling Tendency and Inhibitor Performance

Differential (Dynamic) Scale Loop: Fully automated, easy handling
Differential (Dynamic) Scale Loop: Fully automated, easy handling

Production engineers are responsible for the design, operation and efficiency of water handling systems in which thermal, pressure or chemical changes lead to scale deposition.
Our differential scale loop provides an accurate, reproducible and fast method for selecting and quantifying the most effective means of controlling scale deposition under dynamic pipeline conditions.

The instrument is suitable to simulate process or reservoir temperatures of up to 280 °C and pressures of up to 14,500 psi. Higher ratings can be provided if required. An integrated pH probe ist available. The system is very recommended where effects of pressure on scaling tendency are to be studied, and especially for examining the deposition of anhydride under dynamic conditions.

Fully automated fluid management with 3 HPLC pumps
Fully automated fluid management with 3 HPLC pumps

The system is equipped with an adjustable back pressure valve which keeps the absolute pressure in the system constant. The 3 high pressure, high precision HPLC pumps can have PEEK or stainless steel heads. Each pump delivers just one fluid - anionic brine, cationic brine, inhibitor -, which provides maximum accuracy. The 3 fluids are mixed automatically and flow through the exchangeable test pipeline.

Big touch screen display
Big touch screen display

The test pipeline is installed in a PC controlled oven with forced convection. Its door has a glass window for full control of the setup during the test.
A high-precision differential pressure transducer monitors the pressure drop across the test pipeline. Exceeding the set differential pressure limit indicates scale formation. If this limit is not exceeded within a set time, the system switches dynamically to the next lower inhibitor concentration. 

PC controlled oven with glass window door
PC controlled oven with glass window door

After the test, the system cleans itself automatically with two cleaning fluids.
This automated test procedure enables 24h use of the instrument with minimal attendance.


Technical Data

  • 3-pump system (more accurate than 2-pump systems)
  • Differential pressure: 5, 10, 20 or 100 bar (72, 145, 290 or 1450 psi)
    Resolution: 0.5, 1 or 2 mbar (0.007, 0.015 or 0.029 psi)
  • Absolute pressure ratings from 100 bar (2,900 psi) to 1,000 bar (14,500 psi) available
    PEEK pumps heads available up to 200 bar (5,800 psi)
  • Flow rate: 10 ml/min max per pump
  • Temperature: 280 °C max



  • big touch-screen display
  • PC included, with WinDSL software for data visualisation and storage
    (Windows XP/7/10)
  • weight: approx. 70 kg
    (depending on model)
  • dimension (BxHxT):
    approx. 120 x 65 x 60 cm
    (without PC, depending on model)
  • mains power: 240VAC@50Hz or 120VAC@60Hz or 208VAC@60Hz
  • power consumption: 2000 Watt max