Camden CM-5085GPTE Spring Return DPST Pneumatic Time Delay
The Camden CM-5085GPTE is a spring return, dual-pole single-throw (DPST) pneumatic time delay module engineered for controlled actuation of electromagnetic door strikes in access control installations. Rated for 24VDC operation with a 6-amp contact rating, it delivers a field-adjustable 1–60 second delay window via integrated pneumatic timing — eliminating the need for separate electrical timers and simplifying panel wiring. This mechanical fail-safe design resets automatically when power is removed, preventing ghost locks or prolonged unlocked conditions that could arise from timer circuit failure.
Key Features
- DPST Configuration: Dual-pole single-throw contacts enable independent control of two circuits — one strike with redundant contacts for fail-safe confirmation, or two separate door mechanisms from a single timer module.
- Pneumatic Timing: 1–60 second field-adjustable delay via integrated screw mechanism; no electrical calibration or software required, reducing commissioning time and training overhead.
- 24VDC, 6A Rating: Compatible with standard 24VDC access control panels and electromagnetic locks (magnetic strikes, solenoid releases) without additional relays or power conditioning.
- Spring Return Fail-Safe: Mechanical reset on power loss prevents stuck-open or stuck-closed contacts — critical for life-safety egress and ADA-compliant door operation.
- Compact, Pole/Rack Mount: Space-efficient design fits standard 19" relay racks and pole-mount enclosures; minimal footprint within cabinet or pedestal installations.
- UL 294 Compliance: Designed for access control systems and electric locking device control per UL 294 and International Building Code egress standards.
The CM-5085GPTE serves environments where timing consistency and mechanical reliability outweigh software-driven timer features. Manufacturing facilities, secure entry doors, and multi-tenant buildings deploying hardwired access control frequently specify pneumatic timers to avoid network dependencies and reduce mean time to repair (MTTR) on mission-critical door hardware.
Integration is straightforward: wire the two white leads (common/return) and two red leads (control) directly to your access control panel's 24VDC output and strike circuit terminals. The pneumatic cylinder and needle valve seat inside the module; field adjustment of the delay is performed by rotating the screw mechanism (typically labeled 1–60 on the housing) before final commissioning. Because this is a passive pneumatic timer, no firmware updates, network configuration, or VMS coordination is needed — turn the adjustment screw, verify the delay on a test cycle, and lock the module into the cabinet.
Operating environment matters: pneumatic timing is temperature-sensitive. Extremely cold rooms (below 5°C / 41°F) may lengthen delays slightly due to air density changes; extremely warm environments (above 45°C / 113°F) may compress the delay window. For installations in freezers, outdoor vestibules, or unheated warehouses, consult the datasheet and conduct a site-specific test cycle. The module itself is passive (no active heating or cooling) and has no IP-rated enclosure rating — it is intended for cabinet or pole-mounted installation in climate-controlled or semi-controlled spaces.
This is a genuine mechanical timer, not a solid-state relay. It has no software, no firmware, no battery backup, and no remote reporting capability. Upgrading to a network-connected access control system does not render this module obsolete — many integrators intentionally retain pneumatic timers on critical egress doors as a redundant, non-networked failsafe layer. Pair this with a Camden access control catalog for full strike and relay offerings.
Marty AllisonPerspective based on aggregated IP Security Depot and affiliated engineering team experience.
We've deployed the CM-5085GPTE across access control retrofits where reliability and simplicity are non-negotiable — government buildings, healthcare facilities, and manufacturing sites that treat door timing as infrastructure, not a feature. The pneumatic delay is the product's strongest asset: there are no electronic timing drift issues, no capacitor aging, no firmware bugs that could lengthen or shorten hold-open duration over months of operation. Once you set the needle valve to, say, 3 seconds, it will deliver 3 seconds on day one and day 365 without calibration. On a 50-door facility, that consistency translates directly to training efficiency (installers can verify timing visually, not debug software logs) and lower support overhead. The DPST configuration is underrated — in practice, we've used the dual contacts to run one strike on the primary contact pair and a second auxiliary strike (or even a door status sensor relay) on the secondary pair, all from a single module. That saves cabinet space and reduces wiring runs.
Technical Highlights:
- Pneumatic Actuation (1–60 sec): Entirely mechanical; no electrical timers, no firmware updates, no network dependency. The needle valve physically meters air flow through a fixed orifice — what you set is what you get. We've observed better long-term timing stability in high-vibration environments (parking-garage door releases, industrial foyers) compared to solid-state relay timers.
- DPST Contacts, 6A @ 24VDC: Dual-pole architecture means you can wire one strike to both contacts for redundant feedback (fail-safe confirmation that the strike energized), or split the contacts across two independent 24VDC loads (e.g., one solenoid, one magnetic lock). Most access control panels output 24VDC at the logic level; verify your panel can supply 6A on the strike rail — undersized power supplies are a common installation mistake.
- Spring Return Fail-Safe Design: When 24VDC power is removed or the access control panel outputs zero, the internal spring mechanism instantly resets the switch contacts. No residual solenoid holding current, no lingering unlocked state. This is critical for egress compliance — in a fire or power failure scenario, the door defaults to its mechanical state (locked, unless hardware is push-to-exit).
- Temperature-Dependent Delay Variance: Pneumatic timers are sensitive to ambient air temperature. In a 5°C freezer, the delay stretches by ~10–15%; in a 45°C warm space, it compresses slightly. For temperature-critical applications (exterior doors, refrigerated areas), conduct bench testing at the expected operating range and document the variance in your commissioning sheet.
- Zero Network Overhead: This module adds zero IT complexity. No IP configuration, no VMS integration required, no cybersecurity surface. It is a pure hardwired relay — appropriate for legacy systems, air-gapped facilities, and defense/government installations with restricted network policies.
Deployment Considerations:
- Verify your access control panel outputs exactly 24VDC and supplies at least 6A on the strike circuit before ordering. 12VDC or higher-voltage panels require a different timer module; 24VDC panels with undersized power supplies will cause intermittent timing or strike failure under load.
- Pneumatic timing is field-adjustable but not remote-adjustable. If you need to change the delay after installation, someone must physically access the timer module and turn the adjustment screw. Plan commissioning and final timing validation before the cabinet is sealed or mounted in a secure location.
- Mount the module in a climate-controlled cabinet or indoor enclosure. Outdoor or unheated installations experience temperature-driven timing drift; if outdoor deployment is unavoidable, wrap the module in foam or use a heated cabinet to stabilize internal air temperature.
- The module has no built-in test-cycle button. Verify timing by applying 24VDC power to the coil and measuring the delay with a stopwatch or multimeter on the contact pair. Document the measured delay for compliance and audit trails.
- If integrating into a new network-based access control system, confirm that your system's local panel or field controller can still provide 24VDC strike power and accept a hardwired relay timer. Newer cloud-only systems may not support legacy relay-based timing.
The CM-5085GPTE is the right choice for integrators and end-users who prioritize mechanical reliability, long-term consistency, and regulatory compliance over feature richness. Choose this module when timing accuracy matters more than remote adjustment, or when your facility policies mandate fail-safe hardware independent of software. Explore the full Camden catalog for compatible strikes, solenoids, and access control hardware.
