inline Differential Scale Loop
Inline measurement of salt deposits on site
The inline Differential Scale Loop (iDSL) is a specialized instrument for measuring crystalline scale deposition directly at the production site. It can be connected inline to operating systems and is ideally suited for geothermal installations, oil & gas production, and industrial pipeline systems affected by scale formation such as carbonates, sulfates, silicates, phosphates, iron compounds, or even sugar crystallization.
Unlike conventional tube-blocking systems, the iDSL allows true live testing using production fluids — no sampling, transport, or laboratory simulation required.
All important features of inline DSL
- Direct inline connection to production systems
- Live testing with real process fluids
- Suitable for silicates and other hard scales
- Open cartridge instead of closed capillary for mechanical cleaning
- Option: 3-Pump-system for automated tests in the lab
- Operating conditions up to 250 °C and 172 bar
Application Areas of inline Differential Scale Loop
The inline Differential Scale Loop can be used both in the laboratory and directly in the field for monitoring aqueous fluids with scaling tendencies
Investigation of geothermal brines or industrial water
Testing of silicate, carbonate, sulfate, and iron scales
Evaluation of scale inhibitors
Warning system for scaling / Long-term online monitoring of scaling tendencies
Quality control of production and industrial systems
Prevention and early detection of crystalline deposits
Mobile, robust, and designed for production environments
Live testing instead of laboratory simulation
The iDSL combines laboratory-grade precision with the robustness required for field deployment. Production fluids at temperatures up to 250 °C and pressures up to 172 bar are fed directly into the system. If required, the fluid is conditioned before entering the test section.
Scale formation is detected at a very early stage by monitoring the pressure increase across the spiral-groove test section. This pressure-based method provides higher sensitivity and reliability than optical techniques and allows the iDSL to be used as an online scale warning system during long-term operation.
This enables precise optimization of inhibitor selection and dosage directly under real operating conditions.
IN USE WORLDWIDE
Used by Leading Labs
Innovative measurement concept
Direct access to scale deposits
For inline operation, the traditional test capillary has been fundamentally redesigned. Instead of a closed metal capillary, the iDSL uses a pressure-resistant cartridge with a spiral groove machined into a solid metal cone.
This design allows:
- Direct visual inspection of scale deposits
- Easy access to the deposited material for further analysis
- Simple mechanical cleaning after each test
As a result, the iDSL is particularly suitable for hard-to-dissolve scales, such as silicates and phosphates, which are difficult or impossible to handle with conventional systems.
Advanced temperature control
The iDSL features a compact electrical heating system combined with active cooling, allowing fast temperature changes and short turnaround times between tests. This ensures high operational flexibility both in the laboratory and in the field.
Two-pump system with automation options
Third pump for automated tests in the lab
In its standard configuration, the iDSL is equipped with two pumps:
- One for inhibitor dosing
- One for brine stabilization or destabilization
This setup supports automated tests and long-term online monitoring.
For laboratory applications, semi-automated test sequences can be performed.
Optionally, a third pump can be added to enable automatic variation of inhibitor concentration during a test.
Online Demo with inline Differential Scale Loop iDSL
During the product demonstration, you will gain many insights into how it works. You can follow the measuring process live and then discuss your questions with our experts.
The most important facts at a glance
| Temperature range | +10 .. +180 °C, inlet up to +250 °C |
| Pressure Range | 3.4 .. 45 / 172 bar (49 .. 650 / 2,500 psi) |
| Flow rate |
Each pump: 0.1 .. 5 ml/min total: max. 10 ml/min |
| Model pipeline |
Length: 1 m, ID: 0,35 mm, |
Data sheet inline DSL
In the product data sheet you will find the exact specification as well as many data and options to help you decide on the inline Differential Scale Loop iDSL.
WHY PSL?
We set new laboratory standards with our devices
We have been developing, manufacturing and selling innovative laboratory instruments specifically for Flow Assurance for 25 years, setting new standards in the laboratory for professionals. We have been awarded innovation prizes for this. Our export quota of 90 % earned us the Export Oscar of Northern Germany.
PSL stands for reliability, quality and innovation. We are proud that the Big Five in the industry are among our satisfied customers.
WHAT WILL BE YOUR BENEFIT?
Reliable, high-quality instruments for your success
SAVE TIME IN EVERYDAY LAB WORK
with automated test cycles, cleaning procedures and easy-to-clean parts.
EASY TO USE
with a user-friendly, high-quality design for simple, correct and safe handling.
LONG LIFETIME MADE IN GERMANY
thanks to the sophisticated and robust design as well as the high-quality materials and manufacturing.
TRUSTED SERVICE - WORLDWIDE
with our online support, maintenance contracts and on-site service. We guarantee 20 years of repair service.
MEASURE LIKE INDUSTRY LEADERS
With innovative and advanced instruments, you can measure future-proof like the leading laboratories.
PLEASURE TO MEASURE
Our instruments make work a pleasure. They were developed together with the users.
