Due to their advanced balance and weighing technology and their multi-sample capability, the SPS and Vsorp sorption insutruments of Proumid provide several fundamental advantages.
High sample throughput
With the SPS and Vsorp sorption test systems, the sorption behaviour of up to 23 samples can be determined simultaneously.
Especially in test series with multiple samples or high sample volumes, cumulated measurement times with a single sample instrument often are far too long.
A study of 10 samples in a single-sample instrument with a measurement time of 5 days each, results in a total of almost two months.
In a multi-sample test system with 23 sample position, water sorption of each sample can be determined in duplicate and the measurement is still finished within 5 days.
Comparability of samples
With the SPS and Vsorp systems, all samples of aseries are measured at the same time and under the same conditions. In this way, even the smallest differences between samples and batches can be detected.
The possibility to quickly and accurately compare various batches of a particular material opens completely new perspectives in process development and quality control.
More time available per measurement
When using single-sample instruments, the time available for each measurement is often limited and the individual climatic settings can only be maintained for very short periods.
Important information on sample behaviour, e.g. stability, may therefore be lost.
Optimised sorption kinetics
The comparatively large sample pans of the SPS and Vsorp instruments allow for very thin sample layers. Delays in sorption kinetics due to material arranged in a heap is thus minimised.
The samples are directly underneath the gas flow. This avoids bulk diffusion effects and humidity gradients within the sample.
High dynamic load range
The SPS and Vsorp instruments are equipped with a balance whose entire load range can be used.
The samples can thus be weighed in easily and even large variations in sample weight are not a problem.
Many sorption test systems still work with an electronic beam balances. These balances offer high sensitivity and resolution, but their weighing range is limited. The sample pan must normally be counterweighed and, in the case of higher sample weights, the balance itself must also be tared by an appropriate counterweight.
Excellent baseline stability
The figure shows the acceptance test procedure for an SPS23-100n sorption test system. In this test, the system is run at all temperatures and humidity levels and the weight of an empty sample pan (zero line) is measured.
The figure shows that the zero line or baseline remains the same throughout the measurement. All drift effects are eliminated.
The SPS sorption test systems have spare sample pans to store additional sample material in the test chamber.
If, during sorption measurement, a sample shows unusual behaviour requiring additional analyses (e.g. XRPD, microscopy, etc.), the parallel sample can be withdrawn without interfering with the sorption measurement.
Easy to operate and easy to clean
The sample tray can be removed easily and the sample pans can be filled and inserted without any problems.
In the case of inadvertent spillage, the test chamber is easy to clean.
The large test chamber and the high load range allow multiple applications and special pans.
For example, the SPS and Vsorp systems can be used to measure permeability, diffusion, cytostatics or electrostatically charged samples.
The sample pans can be modified to meet special requirements.
The range of additional sensors is steadily expanded:
SPS sorption test systems can be supplemented, for example, by a Raman spectrometer or a camera with ring light.
The use of further sensors is currently being explored.
Service life and support
The SPS and Vsorp systems are subject to continuous development and improvement.
At the same time we take care that all hardware and software remains compatible with previous models.
Even the oldest SPS sorption test system (dating back to 1999) still works – with the latest software.