When several detectors are installed in a system the connecting capillary and fittings between the detectors must be carefully chosen to keep chromatographic influence on peak shape small. On the other hand narrow bore connection capillaries generate a significant pressure drop dependent on flow rate and solvent properties.
The pressure relief valve is designed to protect the Max-Light Cartridge Flow Cell. Agilent Technologies strongly recommend installing the pressure relief valve at the outlet of the detector as soon as a second detector is installed like in LC/MS applications.
The pressure relief valve is a low internal volume check valve. The dead volume is smaller than 100 nL delay volume (inlet to outlet). The ball of the check valve is spring loaded and adjusted to open at typically 80 bar. On overpressure (typically above 80 bar) it releases the pressure to waste.
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id: 3526193803