How to Measure Sample Vials for a MULTIVAP Nitrogen Evaporator

Organomation has specialized in manufacturing nitrogen evaporators for over fifty years.  Organomation's MULTIVAPs are ideal for concentrating large batches of samples, and are used in numerous sample preparation methodologies. The 9, 30, 48, and 80 position units are available in high temperature dry block models.  Nitrogen gas is delivered to each sample via individual stainless steel needles connected to the hand built gas distribution manifold. All of our MULTIVAPs include a built in timer to shut heat and nitrogen gas off for maximum efficiency. 

The uniform evaporation provided by the system stems from the block inserts which are expertly customized to your sample vials.  These inserts are designed to have a snug fit around your sample vials for optimal heat transfer. 

Typically, Organomation technicians drill inserts so that approximately 7mm of the sample vial is sticking above the insert as illustrated in the picture below.  This provides the operator with enough room to seize the sample vial without burning themselves while the insert covers the majority of the vial for the best heat transfer possible.

If you desire a different set up, i.e. you want more of the test tube to stick out above the insert, please inform an Organomation Sales Technician when placing your order.

Since these inserts and heat blocks are made-to-order, we will request that you deliver three sample vials for each vial size upon placing an order for a 30, 48 or 80 Position MULTIVAP.  One set of custom sample inserts comes standard with each 30 or 48 Position MULTIVAP, and a custom heat block comes with an 80 Position MULTIVAP.  However, if you plan on ordering an additional set of inserts which will enable your MULTIVAP to process samples of a different size, we will need two sets of sample vials.   

In situations where shipping sample vials to Organomation is not possible, we need precise measurements of your sample vials.  We recommend using digital calipers to generate these measurements.  If digital calipers are not available, measurements provided by a mechanical micrometer are also acceptable. 

The goal is to arrive at the largest outside diameter of three or more sample vials, rounded up to the nearest 0.1mm. 

  1. Slowly spin the sample vials to find the widest part, measuring only the section of the sample vial which will go into the insert
  2. Repeat this process with several sample vials because the height and outside diameter can vary by a few tenths of a millimeter between sample vials
  3. Contact an Organomation Sales Technician and inform them of the largest measurement of the height and outside diameter of your sample vials

Do not worry about oversizing the dimensions once you have measured your vials. Organomation technicians will drill the inserts slightly wider than the diameter of your sample tubes to allow for thermal expansion, so your vials will not get stuck in the instrument.