For Phenol, we have a module with which they want to do both Total Phenol and Free Phenol. Is the customer going to use this as a screening, so first do Free Phenol and then re-analyse for Total Phenol or will there be two completely different samples so that they use the module for instance first for Free Cyanide and than at another time with different samples, use it for Total Cyanide? If the latter is the case, than we advise to put in the manual 5290 switching valve to bypass the distillation unit. If they use it as a screening module (so directly after each other on the sample, than the automatic switching valve can be used)