SRS Pro Solvent Recycling System

With a modern, compact design and innovative features, the SRS Pro brings a fresh approach solvent recycling. No power adapter is required as the solvent saver is powered directly from the chromatography data system PC through a USB connection. Easy to use software is provided to configure the system parameters, and also includes on-line monitoring and audit trail facilities. Analog input allows unipolar or bipolar operation of the device within a range of ± 1V with an analog-to-digital converter facilitating further evaluation by the built-in processor. TTL/contact closure for the device can be configured as start, auto-zero or valve position control input.

Operational principle
The SRS Pro continuously monitors the output signal of the chromatographic detector, recycling the mobile phase to the solvent reservoir when the baseline is below a certain preset threshold. Operation of the SRS Pro is illustrated in the diagram below.
If the input signal level exceeds this threshold value, the SRS Pro redirects the eluent flow to waste (1), taking account of the transport time from the detector to the switching valve.
When the signal returns below the threshold (2), the SRS Pro again waits for the transport delay and then switches the mobile phase back to the reservoir.

If the input signal level exceeds this threshold value, the SRS Pro redirects the eluent flow to waste, taking account of the transport time from the detector to the switching valve. When the signal returns below the threshold, the SRS Pro again waits for the transport delay and then switches the mobile phase back to the reservoir. Autosampler injection marker connected to the SRS Pro may ensure the zeroing of signal input at the moment of injection.

The SRS Pro is designed to recycle the mobile phase only if switched on. The normal position of the 3-way valve is waste. Therefore, in case of power failure the valve remains in the waste position and the mobile phase in the reservoir remains uncontaminated.