CCS 646DZE Adjustable Differential Pressure Switch – Explosion Proof

Overview

The CCS 646DZE Series Adjustable Differential Pressure Switch is a high-performance industrial pressure control device engineered specifically for hazardous area applications. Utilizing the patented CCS Dual-Snap® Belleville disc spring principle, this series provides highly stable, repeatable switching performance even under extreme vibration, shock, and pressure cycling conditions  .

Unlike conventional diaphragm-only switches, the 646DZE integrates aerospace-based engineering principles with a rugged midsize enclosure and hermetically sealed electrical assembly. The result is a pressure switch capable of maintaining long-term calibration stability in demanding oil & gas, offshore, chemical, and industrial environments.

This series is internally adjustable in the field, allowing precise set point configuration without removing the device from service. The switch supports differential pressure ranges from:

0.4 to 1000 PSID

(0.028 to 68.94 bar / 2.76 to 6895 kPa) 

Dual-Snap® Belleville Disc Technology

The defining engineering feature of the 646DZE Series is the Dual-Snap® sensing mechanism.

This technology provides:

• Fast snap action switching

• Reduced contact chatter

• High cycle life

• Repeatable actuation points

• Stable deadband control

• Vibration resistance

Compared to traditional diaphragm pressure switches, the Belleville disc mechanism improves mechanical repeatability and increases operational longevity in cyclic systems.

Hazardous Area & Explosion Protection

The 646DZE Series is designed for operation in hazardous environments and offers:

• Explosion-proof hermetically sealed electrical assembly 

• NEMA 4, 7, 9, 13 / IP66 enclosure rating 

• UL / CSA Listed 

• ATEX certification (Option Y) 

• Dual Seal ANSI/ISA-12.27.01 

• NACE MR0175 / ISO 15156 compliance 

These certifications make the 646DZE suitable for:

• Class I, Div 1 & Div 2 hazardous areas

• Oil & gas production facilities

• Refineries

• Offshore platforms

• Chemical processing plants

• Gas compression systems

Adjustable Set Point Range

The series covers multiple pressure ranges including:

• 1.2–18 PSID

• 6–75 PSID

• 10–75 PSID

• 20–150 PSID

• 50–375 PSID

• 330–1000 PSID 

Deadband varies by range (approx. 0.8 to 80 PSI depending on model)  .

Field setting is performed by opening the access cover and adjusting the internal wheel mechanism. Clockwise increases set point; counterclockwise decreases  .

Electrical Characteristics

Available electrical configurations:

• SPDT

• DPDT

• Double Break

Typical ratings include:

• 15A @ 125/250 VAC

• 15A @ 480 VAC

• 2A @ 28 VDC

• Gold contact options available (-7008 suffix) 

Hermetically sealed assemblies improve reliability in corrosive and high-humidity environments.

Pressure Ratings

Depending on range:

• Max System Pressure: up to 3000 PSIG 

• Proof Pressure: up to 5000 PSIG 

• High over-pressure capability (system & proof) 

This makes the series suitable for high-pressure hydraulic and gas systems.

Wetted Materials

Standard wetted parts include:

• 300 Series Stainless Steel Pressure Port

• Polyimide Diaphragm (Standard)

• Stainless Steel Diaphragm (-7011 option)

• Viton O-Ring 

Optional material suffixes are available for compatibility with various media.

Operating Temperature

Operating temperature range:

-40°F to 186°F (-40°C to 86°C)

(Temperature depends on O-ring selection) 

Industrial Applications

The CCS 646DZE Series is widely used in:

• Differential pressure monitoring across filters

• Pump protection systems

• Compressor monitoring

• Hydraulic safety interlocks

• Gas pressure differential alarms

• Burner management systems

• Offshore drilling equipment

• Refinery process control

• Chemical plant pressure monitoring

• Pipeline safety systems

Ordering Logic

Part numbers follow structured configuration:

Example:

646DZEM1-7011

Series + Electrical Option + Suffix 

Available suffix examples:

• 7008: Gold Contacts

• 7054: 2 Meter Free Leads

• 7065: 18” Teflon Free Leads

• 7108: 1/4”-18 NPT Female High Pressure Port 

FAQ

Q1: What is the difference between differential and static pressure switching?

Differential pressure switching measures the pressure difference between two ports, enabling filter monitoring, pump health detection, and system imbalance detection.

Q2: Is the CCS 646DZE explosion-proof?

Yes. It includes UL/CSA and ATEX certified explosion-proof hermetically sealed assemblies  .

Q3: What is the maximum pressure capability?

Depending on range, system pressure can reach 3000 PSIG with proof pressure up to 5000 PSIG  .

Q4: Can the set point be adjusted in the field?

Yes. The device allows internal adjustment via an accessible wheel mechanism  .

Q5: Is it suitable for sour gas environments?

Yes. The series complies with NACE MR0175 / ISO 15156 for corrosive oil & gas environments  .

Call to Action

For pricing, model configuration assistance, lead time, and technical consultation regarding the CCS 646DZE Adjustable Differential Pressure Switch Series, contact Seven Star LLC. Our engineering team can assist in selecting the correct pressure range, electrical configuration, and certification option for your hazardous area application.