Altronix TEMPO2 Universal 2-Stage Timer

We've specified the TEMPO2 in dozens of access control retrofit projects where a customer needed simple sequential activation without replacing their entire control logic stack. The real-world advantage is that you don't need programming expertise or a PLC to achieve 2–3 second staggered gate-unlocking sequences. On projects where door-lock release must precede gate solenoid activation (to prevent mechanical binding), the TEMPO2 handles that hardware-level timing reliably. One caveat: the module is a dumb relay timer—it has no feedback on whether the relay actually energized or whether the downstream load (solenoid, siren, light) responded. If you need confirmation that a gate actually moved or that a lock engaged, you'll need a separate position sensor and a controller that monitors those inputs. The TEMPO2 solves timing; it doesn't solve state verification. That said, in parking lots, small office entry points, and emergency stairwell control where the failure mode is low-risk (gate stays open, not a security breach), the TEMPO2's simplicity and reliability win. Potentiometer tuning in the field is far faster than reprogramming a PLC, and the lifetime warranty means you're not budgeting replacement cycles every 3–5 years.

Technical Highlights:

• Dual 1–60 Second Independent Stages: Each relay output is configured independently. Stage 1 and Stage 2 run sequentially on the same trigger signal; if you only need one delay, leave the second output unloaded and it simply idles. The potentiometer-based adjustment means no firmware flashing or code changes—dial in 2.5 seconds for the unlock, 5 seconds for the gate, and walk away.
• 12-24VAC/VDC Universal Input: Eliminates SKU sprawl. A single part number works in a 24VDC UPS-backed system, a 12VAC transformer-powered cabinet, or a 18VAC outdoor enclosure. Field swaps become non-stock items.
• 12A Relay Contacts: Sufficient for 24VDC solenoid locks (typically 0.5–2A coil draw), gate operators at 24VAC (3–6A pull-in), strobe lights, and audible alarms. Exceeding 12A requires external power contactor—a trivial addition for high-current equipment, but rarely necessary in access control scope.
• Electromechanical Relay Switching, No Microcontroller: Means no firmware vulnerabilities, no software updates required, and deterministic switching behavior. The relay either closes or it doesn't; there's no race condition or timing jitter. In tamper-sensitive environments (e.g., intrusion-alarm backup circuits), this is a real advantage over solid-state timers.
• Minimal Quiescent Load: Idle current draw <30mA. On a 24VDC backup battery system, the TEMPO2 doesn't meaningfully shorten emergency-egress battery runtime. You can install one in every exit solenoid delay circuit without worrying about amp-hour arithmetic.

Deployment Considerations:

• The TEMPO2 outputs are combinational—they do not self-reset. Once triggered, they run through both stages and stop. If you need continuous pulsing or manual restart, you must route the output back into the input or use an external oscillator. This is by design and keeps the module simple, but it's a gotcha if you're used to PLC-style timers with different reset modes.
• Timing is potentiometer-adjusted, not digitally set. If you need sub-1-second precision or remote configuration, this isn't the right module. But for mechanical lock hold-times and gate-actuation delays (which are inherently ±500ms tolerant), the potentiometer is perfectly adequate and more field-friendly than a keypad.
• No feedback or status output. The module does not report whether a relay is energized or de-energized to a control system. If the solenoid coil burns out, the TEMPO2 still sends the command; you won't know the lock didn't actually engage until someone can't open the door. Plan for position switches or door-sensor feedback if state verification is a requirement.
• Mounting in outdoor or vibration-prone enclosures: use a DIN-rail or secured bracket. The relay contacts are rated for the stated load, but vibration can occasionally cause intermittent contact bounce on older installations. Inspect relay contact condition annually if the module is in a vehicle-impact-prone location.
• Input trigger signal must be clean—debounced push-button, door-contact closure, or relay output from an access reader. Noisy or floating inputs can cause false triggers. If you're pulling the input from a long-run sensor wire, add a 100nF capacitor across the input terminals to suppress line noise.

The TEMPO2 is the right choice for integrators and facilities managers who need repeatable, field-adjustable timing without firmware or software overhead. If you're building a modular security cabinet with Altronix 24VDC power and access relays, the TEMPO2 is your off-the-shelf sequencing glue. See the Altronix catalog for complementary power distribution, backup power, and control modules.