Both types include an isolation valve and can be configured as remotes (SA) or as fieldbus connected bases (EN, PN).  The hubs have an extra IO link port for connection to additional devices that can communicate through the system.

Silicon is a chemical element (Si) known for its use as a semiconductor material.
Silicone, on the other hand, is an artificial compound made from silicon (the main component of siloxane).
Is it perhaps silicone that the user sees as a problem?
If so, there is only silicone used in the sealant of KQ2 and KQG2 series One-touch fittings.

.· Suitable for use in CRT production lines where contact with copper must be avoided, as well as cleaning of food processing machines where water or salt water splashes.· Suitable for use inside clean rooms where discoloration of copper materials and dust caused by corrosion must be avoided.Applications· The internal hex allows thread connection by using an Allen wrench for confined spaces

.· Suitable for use in CRT production lines where contact with copper must be avoided, as well as cleaning of food processing machines where water or salt water splashes.· Suitable for use inside clean rooms where discoloration of copper materials and dust caused by corrosion must be avoided.Applications· The internal hex allows thread connection by using an Allen wrench for confined spaces

Though it is not listed in the “How to Order” section of the CDM2□-Z series catalog, in the “Auto Switch Mounting” section, D-H7□ and D-C7□ auto switches are listed as being mountable on CDM2-Z series cylinders.
However, we recommend replacing any D-B51/B57/B60/G59W/K59W auto switches from the initial CDM2 series catalog with current auto switches.

Output Specification: IO-Link/Switch: 1 Output, PNP or NPN, Unit Specification: P [Units Selection Function (Initial Value psi)], Under New Measurement Act Selection Function not Permitted for use in Japan, Piping Specification: N01 (NPT1/8), Lead Wire: w/o Lead Wire, Bracket: D [Panel Mount Adapter + Front Protection Cover, (ZS-46-D)]

Output Specification: IO-Link/Switch: 1 Output, PNP or NPN, Unit Specification: Unit Selection Function, Piping Specification: M5 (Female Thread), Lead Wire: W (Lead Wire w/Connector, 5-core, 2m Lead Wire w/Waterproof Cover), Bracket: A2 [Bracket B, Horizontal Mounting (ZS-46-A2)], Operation Manual: T (w/o Operation Manual, Calibration Certificate)

Output Specification: IO-Link/Switch: 1 Output, PNP or NPN, Unit Specification: P [Units Selection Function (Initial Value psi)], Under New Measurement Act Selection Function not Permitted for use in Japan, Piping Specification: N01 (NPT1/8), Connector Type: S (M12 Connector Type), Bracket: A4 [Bracket D for M12 Connector Type (ZS-46-A4)]

Rated Vacuum Range: F (-100 to 100 kPa), Output Specification: Y (PNP Open Collector 2 Outputs + Copy Function), Unit Specification: P (Unit Selection Function, Initial value psi), Piping Specification: C6L (ø6 One-touch Fitting, Elbow Type), Connector Type: S (M12 Connector Type), Bracket: A5 [Bracket E for M12 Connector Type (ZS-46-A5)]

Magnet: Built-in, Mounting: Basic, Cushion: Rubber Bumper, Bore Size: 2 1/2", Stroke: 46", Auto Switch: B54--Reed, DC Volt >5 <24, AC Volt <200, LED, Lead Wire, Lead Wire or Prewired Connector: 0.5m (Or None in the Case of No Switch), Number: 1 pc., Speed Control Type: -, Applicable Tubing: -, Suffix: -

Output Specification: IO-Link/Switch: 1 Output, PNP or NPN, Unit Specification: P [Units Selection Function (Initial Value psi)], Under New Measurement Act Selection Function not Permitted for use in Japan, Piping Specification: NPT1/8, Lead Wire: w/o Lead Wire, Bracket: A1 [Bracket A, Vertical Mounting (ZS-46-A1)], Operation Manual: -

Output Specification: IO-Link/Switch: 1 Output, PNP or NPN, Unit Specification: P [Units Selection Function (Initial Value psi)], Under New Measurement Act Selection Function not Permitted for use in Japan, Piping Specification: Female Thread, Lead Wire: w/o Lead Wire, Bracket: A1 [Bracket A, Vertical Mounting (ZS-46-A1)], Operation Manual: -

Output Specification: IO-Link/Switch: 1 Output, PNP or NPN, Unit Specification: P [Units Selection Function (Initial Value psi)], Under New Measurement Act Selection Function not Permitted for use in Japan, Piping Specification: NPT1/8, Lead Wire: w/o Lead Wire, Bracket: A2 [Bracket B, Horizontal Mounting (ZS-46-A2)], Operation Manual: -

Output Specification: IO-Link/Switch: 1 Output, PNP or NPN, Unit Specification: P [Units Selection Function (Initial Value psi)], Under New Measurement Act Selection Function not Permitted for use in Japan, Piping Specification: Female Thread, Lead Wire: w/o Lead Wire, Bracket: A2 [Bracket B, Horizontal Mounting (ZS-46-A2)], Operation Manual: -

Output Specification: IO-Link/Switch: 1 Output, PNP or NPN, Unit Specification: P [Units Selection Function (Initial Value psi)], Under New Measurement Act Selection Function not Permitted for use in Japan, Piping Specification: R1/8, Lead Wire: w/o Lead Wire, Bracket: A2 [Bracket B, Horizontal Mounting (ZS-46-A2)], Operation Manual: -

Output Specification: IO-Link/Switch: 1 Output, PNP or NPN, Unit Specification: Unit Selection Function, Piping Specification: NPT1/8, Lead Wire: Lead Wire w/Connector, 5-core, 2m Lead Wire w/Waterproof Cover, Bracket: A1 [Bracket A, Vertical Mounting (ZS-46-A1)], Operation Manual: w/o Operation Manual, w/o Calibration Certificate

Rated Vacuum Range: -101 to 0 kPa, Output Specification: IO-Link/Switch: 1 Output, PNP or NPN, Unit Specification: Unit Selection Function, Piping Specification: NPT1/8, Lead Wire: Lead Wire w/Connector, 5-core, 2m Lead Wire w/Waterproof Cover, Bracket: A1 [Bracket A (ZS-46-A1)], Operation Manual: Operation Manual, Calibration Certificate

Rated Vacuum Range: -101 to 0 kPa, Output Specification: IO-Link/Switch: 1 Output, PNP or NPN, Unit Specification: SI Unit Only, Piping Specification: NPT1/8, Lead Wire: Lead Wire w/Connector, 5-core, 2m Lead Wire w/Waterproof Cover, Bracket: A2 [Bracket B (ZS-46-A2)], Operation Manual: Operation Manual, Calibration Certificate

Rated Vacuum Range: -100.0 to 100.0 kPa, Output Specification: IO-Link/Switch: 1 Output, PNP or NPN, Unit Specification: Unit Selection Function, Piping Specification: NPT1/8, Lead Wire: Lead Wire w/Connector, 5-core, 2m Lead Wire w/Waterproof Cover, Bracket: A2 [Bracket B (ZS-46-A2)], Operation Manual: Operation Manual, Calibration Certificate

Rated Vacuum Range: -100.0 to 100.0 kPa, Output Specification: IO-Link/Switch: 1 Output, PNP or NPN, Unit Specification: SI Unit Only, Piping Specification: Female Thread, Lead Wire: Lead Wire w/Connector, 5-core, 2m Lead Wire w/Waterproof Cover, Bracket: A1 [Bracket A (ZS-46-A1)], Operation Manual: Operation Manual, Calibration Certificate