C&K Systems DT435T Dual Tech PIR Microwave Motion Detector 12VDC 9-14V UL

C&K Systems DT435T Dual Tech PIR Microwave Motion Detector 12VDC 9-14V UL

The C&K Systems DT435T is a dual-technology passive infrared (PIR) and microwave motion detector designed for intrusion detection applications. By requiring both the PIR and microwave sensors to trigger simultaneously before sounding an alarm, dual-technology detectors significantly reduce false alarms compared to single-technology units. This unit is UL Listed under Intrusion Detection Unit 372K and bears C&K Systems branding on both the housing and rear label.

Specifications & What's Included

• Model: DT435T (C&K Systems, Inc.)
• Technology: Passive Infrared (PIR) + Microwave dual-technology
• Input Voltage: 9–14 VDC; 35 mA @ 12 VDC
• Microwave Frequency: 10.525 GHz center band
• Alarm Relay: 100 mA @ 30 VDC
• White Light Immunity: 60,000 candle power @ 10 ft.
• RFI Immunity: 30 V/m (10–1000 MHz)
• Tamper Switch: Form A; 25 mA @ 30 VDC
• Sensitivity: 2–4 steps within field-of-view adjustment
• Microwave supervision included
• Operating Temperature: 32–120°F (0–49°C)
• Dimensions: 5" H × 2-7/8" W × 5-5/16" D
• Color: White plastic housing
• Certifications: UL Listed — Intrusion Detection Unit 372K
• PIR fresnel lens window visible on front face; ventilation slots on side panel
• Sensor unit only — no mounting hardware or wiring accessories included

Applications

Dual-technology PIR/microwave motion detectors like the C&K Systems DT435T are used in commercial and residential security and intrusion detection systems. The combination of passive infrared sensing — which detects changes in heat signature as a person moves through the detection zone — and active microwave detection, which senses movement via Doppler-shift reflection, makes these detectors well-suited for environments prone to false alarms from HVAC airflow, sunlight changes, or small animals. C&K Systems (now part of the Bosch Security Systems family) was a major supplier of detection hardware to professional alarm installers and central station monitoring companies from the 1980s through the 2000s. Units like the DT435T were commonly installed in retail stores, office buildings, warehouses, and light industrial spaces as part of hardwired alarm panel systems. The 10.525 GHz microwave frequency and adjustable PIR sensitivity steps make the detector adaptable to a range of room sizes and mounting heights.