Traditionally, ICP-OES and ICP-MS sample introduction systems have relied on o-rings to form a gas-tight seal between the nebulizer and spray chamber. There are several drawbacks with an o-ring seal, such as:
- Potential for contamination due to dead volume around the o-ring seal
- Chemical resistivity of strong acids and organic solvents
- The o-rings are difficult to replace, often requiring tools
- Bonding to the nebulizer can result in breakage
Glass Expansion is now pleased to introduce the new Helix CT spray chamber with ConstantTorque technology, which provides a constant, reproducible, inert, gas-tight seal between the nebulizer and spray chamber.
The new Helix CT nebulizer interface is also simple to use:
- Fully insert the nebulizer into the Helix CT interface, until the nebulizer side-arm comes into contact with the moulded-in positive stop.
- Hand-tighten the Helix CT locking screw until the ConstantTorque mechanism clicks, indicating a secure, gas-tight seal.
Benefits of the New Helix CT Design Include…
ConstantTorque Locking Screw
A new Helix locking screw with CT technology allows for a consistent inert PTFE seal against the nebulizer - making it impossible to overtighten while ensuring a gas-tight seal each and every time. Torque control also improves user safety, preventing broken glassware.
PTFE PressFit Seal
A new PressFit Helix PTFE seal provides a chemically inert seal around the nebulizer. The PTFE ferrule is immune to strong acids and organic solvents routinely used in ICP sample preparation. It therefore eliminates all the drawbacks of the O-ring nebulizer seal, including broken nebulizers.
Prevents nebulizer bonding and breaking
Zero Dead Volume Interface
Compared to other types of nebulizer-spray chamber interfaces, the Helix CT is the only interface that significantly reduces dead volume around the nebulizer. This unique design minimizes washout time with highly concentrated samples, reduces sample to sample carry-over and improves sample throughput.
Washout comparison of 10ppm Mo
Optimum Depth and Torque
The new Helix CT interface still maintains the original positive stop to ensure that the nebulizer is inserted to the correct and optimum depth within the spray chamber. However, the torque applied to the nebulizer seal is also critical. Consistent nebulizer depth combined with ConstantTorque control provides the ICP analyst with unparalleled, reproducible day-to-day analytical performance.
Sensitivity Vs. Torque
For More Information
Download the Helix CT ICP Spray Chamber Application Note or contact Delta to request a Helix CT spray chamber for your ICP.