The modelcode of my instrument contains the letter Z or the number 9. What does this mean?

9 (numerical) and Z (alphanumerical) are used in our model code to indicate non-standard options, for instance for fluid connections which are not so frequently (e.g. 3/8" or 25 mm) or for a combination of seals (e.g. Viton o-rings with a Kalrez plunger). Details about the non-standard option are specified on our order acknowledgement.