Campbell Scientific PVS4100/4120/4150 Portable Automatic Samplers - Manual (Page 25)

Section 1. Product Overview
1-17
detailed information for your specific application, please contact a Campbell
Scientific applications engineer.
1.3.9 Special Systems
1.3.9.1 5/8 Systems
In applications with large particles or materials in the source liquid, a 5/8” ID
system will help prevent clogging. The added diameter adds 66% more volume
to the entire system. As of 2010, both composite and discrete samplers are
available in 5/8”. Smaller pump systems (PVS4120) have minimal capacity
running the larger volume of the 5/8” ID so the larger pump systems
(PVS4100) are recommended.
For a sampler to increase to a 5/8” ID, the following parts and components are
changed to allow for more volume: intake tube, volume control tube, all
fittings, metering chamber, metering chamber lid, discharge tube, sample
container cover, sinker or strainer, and the distributor assembly (for discrete
models).
1.3.9.2 MISA Systems – Teflon and Glass
In applications wherein the water sample must be prevented from coming into
contact with any plastics, a MISA system is recommended. For example, when
testing for acid/base/neutral extractable organics and pesticides, the MISA
system will keep the final sample clean from any contaminants.
MISA stands for “Municipal/Industrial Strategy for Abatement,” and includes
changing all “wetted” components of the sampling system, i.e., everything that
comes in contact with the final sample. The chart below outlines the key
changes made to the sampler for a MISA system.
TABLE 1-13. MISA System Changes
Component Standard Material MISA System Material
Intake Tube PVC Teflon-Lined PVC
Sinker/Strainer Lead Sinker Stainless Steel Sinker/Strainer
Fittings Brass Stainless Steel
Metering Chamber Acrylic Pyrex
Metering Chamber Cover Delrin Teflon with Steel Bracing Ring
Discharge Tube Latex Silicone
Sample Container(s) HDPE (or PP) Glass
O-Rings Buna-N (or Viton) Silicone