Sentry MVS Sampler 5
General Description
Read these instructions completely before proceeding to assemble, install or operate this machine. This machine should
be installed, operated and serviced by qualified individuals. Follow proper local, state and federal regulations for proper
installation and operational requirements.
The Sentry® MVS manual low-emission sampler is specifically designed to collect process samples without emissions
to the atmosphere or exposure to the operator. Dead volume is minimized by using a close-coupled ball valve
specifically designed to provide low dead volume.
The MVS sampler uses our patented side-discharge dual needle assembly that ensures septum integrity and full
venting of process vapors. This non-coring needle design punctures the septum without coring it, allowing for full
resealing of the septum when the sample bottle is removed. The tapered bottle shroud enables proper septum and
needle alignment, preventing accidental spillage or needle breakage. A variety of needle arrangements and sample
bottle sizes are available to meet most sampling requirements. Additionally, a tube stub option is available for high
viscosity fluids or those that contain particulates.
Since operator safety is of the highest concern, the sampling valve interface features an adjustable throttle stop and
spring return (deadman’s) handle. This provides proper sample control and quick closure upon release of the sampling
valve.
Needle Type
The Sentry MVS manual low-emission sampler is a single valve assembly, and the valve is a shut-off valve. The
sampling assembly is provided with a vent connection where vapors can be diverted to a flare or vessel. The sample is
injected into a sealed bottle using a Sentry needle assembly. A second needle on this assembly vents gases from the
bottle and prevents pressure buildup in the bottle.
The valve on the MVS is a spring-return redundant stop valve, with what is commonly called a deadman’s handle. The
handle is rotated to begin sample flow into the bottle. Once the operator lets go of the handle, the valve will close,
stopping flow into the bottle.
The valve assembly is supplied with a bottle shroud with a wire retainer that secures the bottle to the valve during the
sampling operation. The shroud is matched to the sample bottle to ensure the bottle is properly aligned for septum
penetration. The shroud features a slot that allows the operator to view the sample bottle and filling process.
Tube Stub Type
The Sentry MVS also has a tube stub option, which works in a similar fashion to the needle style; however, the sample
is injected into the bottle via a tube stub in lieu of needles. A vent hole in the tube stub assembly vents gases from the
bottle and prevents pressure buildup in the sample bottle.
The valve assembly is supplied with a bottle adapter with a threaded connection that secures the bottle to the valve
during the sampling operation. As with the needle type, the adapter is matched to the sample bottle to ensure the
bottle is properly aligned.
