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Sensors & IoT

Environmental sensors, I/O controllers, and IoT devices for monitoring temperature, humidity, door state, water detection, and other site conditions. IP-connected sensors integrate with VMS and BMS platforms for automated alerting.

Plan Your Deployment

Define sensor types needed per monitoring zone
Confirm IP connectivity and PoE availability at sensor locations
Evaluate SNMP, MQTT, or API integration with your management platform

Plan Sensor Deployment Browse Infrastructure

Showing Results for Sensors & IoT

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DMP

SKU: MET-44WG-18

DMP MET-44WG-18 Overhead Contact

TCP/IP overhead contact for networked door/window detection
In stock · Usually Ships Same Business Day

$37.00 $21.99 Save $15.01

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DMP

SKU: P2S-001

DMP P2S-001 High Security Single Zone Magnetic Sensor

Single zone magnetic sensor for door/window monitoring with HID integration
Special Order · Usually Ships in 2-3 Weeks

$628.17 $530.99 Save $97.18

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DMP

SKU: SM-20WG

DMP SM-20WG 3" Wide Gap Magnetic Reed Contact

3" wide gap magnetic reed contact for networked door monitoring
Special Order · Usually Ships in 2-3 Weeks

$14.00 $7.99 Save $6.01

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DMP

SKU: STB-10

DMP STB-10 3/8" Recessed Contact

3/8" recessed contact for concealed door and window monitoring
Special Order · Usually Ships in 2-3 Weeks

$6.00 $3.99 Save $2.01

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GRI

SKU: 2600

GRI 2600 Water Sensor with Relay

Passive water sensor with relay for 12V/24V alarm systems, no power needed
In stock · Usually Ships Same Business Day

$29.99

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GRI

SKU: 4561

GRI 4561 Tilt Sensor

Miniature tilt sensor detects 13.3mm displacement for tamper detection
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$11.99

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GRI

SKU: 4561R

GRI 4561R Tilt Sensor with Relay

Tilt sensor with relay output for door and window monitoring
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$42.99

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GRI

SKU: DPARM

GRI DPARM Closed Loop Pool Access Alarm

Closed-loop pool perimeter alarm with integrated access control
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$96.99

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GRI

SKU: GB-550

GRI GB-550 Glass Break Sensor Open Loop

Acoustic glass break sensor, open loop wiring, 12/24VDC compatible
In stock · Usually Ships Same Business Day

$34.99

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GRI

SKU: GR3045

GRI GR3045 Panic Switch

Hardwired panic switch with 80A relay capacity for emergency response
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$28.20 $27.99 Save $0.21

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GRI

SKU: H8800

GRI H8800 Humidity Sensor

Precision RH sensor for HVAC, data centers, and facility monitoring
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$195.83 $192.99 Save $2.84

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GRI

SKU: PAA

GRI PAA Pool Access Alarm

Standalone pool perimeter alarm with instant visual and audible alert
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$142.51 $141.99 Save $0.52

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GRI

SKU: SG-2

GRI SG-2 ShockTec Vibration Sensor

Ground vibration sensor with 5–500 Hz detection for perimeter breach warning
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$71.12 $70.99 Save $0.13

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GRI

SKU: T8800

GRI T8800 Temperature Sensor

Industrial temperature sensor for HVAC control and facility automation
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$126.72 $125.99 Save $0.73

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GRI

SKU: WVS

GRI WVS Water Valve Shutoff

Automatic water shutoff controller stops floods at the source
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$441.96 $438.99 Save $2.97

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Optex

SKU: AP-360BR(C)

Optex AP-360BR(C) 360-Degree Ceiling-Mount PIR Detector

360° ceiling PIR detector, battery-powered, recessed mount
Special Order · Usually Ships in 2-3 Weeks

$56.00 $48.99 Save $7.01

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Browse by Product Family

Click through to shop the families that fit your sensors & iot deployment.

Environmental Sensors

Temperature, humidity, and air-quality sensors that integrate directly with VMS and BMS platforms over IP. Critical for data-center monitoring, cold-storage compliance, and facility alerting.

Door & Window Contact Sensors

Wired and wireless door/window state sensors for access control and perimeter monitoring. Trigger camera recording, unlock events, and intrusion alerts in integrated security workflows.

Water & Leak Detection

Flood and moisture sensors for early warning in server rooms, basements, and mechanical spaces. Reduce downtime risk by alerting integrators before water damage spreads.

I/O Controllers & Gateways

IP-based relay controllers and edge gateways that convert analog and discrete sensors into networked events. Enable legacy alarm sensors to trigger modern IP-based alerts.

Wireless & LoRaWAN IoT

Battery-powered wireless sensors and mesh networks for deployments where running cable is impractical. Reduce installation cost on multi-site or temporary monitoring projects.

Integration Modules & Accessories

DIN-rail mounts, power supplies, and firmware integration packs that bridge sensors to camera VMS and building-automation systems.

What to Look For When Buying

The decisions that matter most before you spec.

Power & Network Integration

Most IP sensors run on PoE or 12VDC; verify your switch and PoE capacity before deployment. Learn how PoE budget planning prevents mid-project power shortfalls when adding dozens of sensors.

VMS & BMS Compatibility

Ensure your video management or building-automation platform supports ONVIF, MQTT, or REST APIs for the sensor brands you choose. Mismatched protocols cause missed alerts and manual workarounds.

Sensor Placement & Environmental Rating

IP67 outdoor sensors cost more but survive freezing, salt spray, and direct water spray; IP54 indoor sensors suffice for climate-controlled rooms. System failures during critical events often trace to environmental sensors placed in unrated conditions.

Redundancy & Failover Design

Deploy critical sensors (water detection, door state) with redundant channels or mesh-network backups so a single network drop doesn't blind your monitoring. Especially critical in multi-story or multi-zone facilities.

Brand Ecosystem & Support

Leading vendors like Axis, Optex, and Ubiquiti offer deep VMS partnerships and field-proven integration libraries. Choose brands with active support in your target vertical (retail, healthcare, education).

Firmware & Configuration Management

Plan for initial sensor discovery, IP assignment, and alert-rule configuration. Multi-location deployments benefit from centralized configuration templates and automated provisioning to avoid configuration drift.

Technology Stack

The specs and acronyms that actually affect sensors & iot performance.

ONVIF Compliance

Open Network Video Interface Forum standard ensures sensors from different makers talk to the same VMS without custom drivers. Not all budget IoT devices are ONVIF-certified; verify before bulk purchase.

PoE (Power over Ethernet)

Delivers power and data on one Cat5e/6 cable, simplifying wiring and reducing infrastructure cost. Standard PoE (15.4W) suits most sensors; PoE+ (30W) needed for powered relay outputs and wireless repeaters.

IP Rating (IP54, IP67, IP68)

IP54 = dust and splash-resistant (indoor); IP67 = dust-tight and submersible to 1m; IP68 = designed for continuous submersion. Mismatch causes corrosion and false alarms.

MQTT & REST API

Machine-to-machine publish-subscribe protocols that decouple sensors from specific VMS platforms. Essential for hybrid environments mixing surveillance, HVAC, and building automation.

Wireless Mesh & LoRaWAN

Self-healing mesh networks (Zigbee, Z-Wave, Thread) and long-range LoRaWAN reduce cabling but add latency and complexity. Evaluate range, interference, and battery life before wide deployment.

Trigger & Alert Actions

Sensors generate events (door open, water detected, temp threshold) that can relay to cameras (start recording), buzzers, email, or third-party APIs. Verify event-logic support in your VMS before project kickoff.

Typical Deployment Scenarios

Multi-Floor Office Building (8 floors, 40+ zones)

Deploy Optex door-contact sensors on each zone entry, Axis temperature sensors in server/IT rooms, and water-detection nodes in basement and mechanical closets. Connect via managed PoE switches and bridge to building automation via ONVIF gateway. Estimated sensor count: 50–80 devices.

Retail Chain – 5 Locations, Remote Monitoring

Each store gets door-contact sensors on emergency exits, dressing rooms, and back-of-house; environmental sensors in stockrooms and coolers. Centralize all feeds via Ubiquiti mesh wireless or leased-line tunnel to HQ VMS. Enables chain-wide compliance reporting and instant regional alerts.

Warehouse with Temperature-Controlled Zones

Mount humidity and temperature sensors in cold storage (IP67), dry goods, and receiving areas. Link to BMS and camera system so temperature drift triggers preservation alerts and footage review. Add redundant power supplies to I/O controller for 99.9% uptime.

School Campus – Access Control + Environmental

Install door-contact sensors on all building entries and emergency exits, occupancy sensors in cafeteria and gymnasium, water-leak nodes in basement. Integrate with access-control system and school surveillance design to auto-lock doors and log after-hours entry attempts.

Top Brands for Sensors & IoT

Click through to each brand for engineering profile and NDAA compliance status.

Axis

Authorized dealer · browse the full Axis catalog for this category

Optex

Authorized dealer · browse the full Optex catalog for this category

Ubiquiti

Authorized dealer · browse the full Ubiquiti catalog for this category

DMP

Authorized dealer · browse the full DMP catalog for this category

Frequently Asked Questions

Can I mix sensor brands on the same VMS?

Yes, if they all support ONVIF, MQTT, or REST APIs. However, integrators report smoother deployments and faster troubleshooting when 80%+ of sensors share a common protocol and brand ecosystem. Test interoperability with your VMS vendor before committing to a mixed-brand architecture.

How many sensors can a single PoE switch support?

Depends on switch wattage and per-port power budget. A 250W PoE+ switch typically handles 15–20 full-power devices; lean sensors (door contacts, simple thermal) can pack 40+ per switch. Calculate total watts needed, then add 30% headroom for future expansion. See PoE budget planning for detailed math.

What's the difference between MQTT and ONVIF for sensor integration?

ONVIF is a camera-centric standard; best for VMS-to-sensor events (motion, door open, alert). MQTT is a lightweight pub-sub protocol that works across IoT platforms (VMS, HVAC, lighting, ERP systems). Use ONVIF for tight surveillance workflows; MQTT for loosely coupled multi-system environments.

Do wireless sensors need a mesh network, or can they talk directly to the VMS?

Most wireless sensors (Zigbee, Z-Wave, LoRaWAN) require a hub or gateway to reach IP networks and the VMS. Mesh networks self-heal around dead zones but introduce latency (100–500ms). For real-time door alerts, direct wired or PoE sensors are more reliable.

How do I prevent false water-detection alarms?

Place sensors at the lowest point of potential pooling (floor corners, under pipes), not on exposed surfaces where humidity or condensation triggers false positives. Use hysteresis or debounce logic in the controller—require 30+ seconds of wet contact before raising an alert. Test during HVAC commissioning to validate placement.

Can sensors integrate with legacy alarm panels, or do I need a new system?

Legacy hardwired alarm sensors (door contacts, glass breaks) can be bridged to IP via an I/O controller or relay gateway that converts discrete inputs to network events. This hybrid approach defers replacement costs while enabling VMS alerting and modern analytics.

Related Categories

Adjacent equipment that typically ships alongside these products.

Power Delivery & Supplies Routers & Gateways PoE Injectors & Midspans Extenders & Repeaters Network Switches Switch Modules Media Converters Wireless Bridges

Engineering Reading

Deep-dives from our engineering team on deployment planning.

Why Surveillance Systems Fail During Incidents Why Your NVR Can't Handle Its Rated Camera Count Why Surveillance Networks Collapse at the Core Why Large Surveillance Systems Fail: Storage Throughput Reality Why Surveillance Standards Collapse After the Third Location Why 4K Cameras Fail at Night Why Your PoE Switch Fails After 18 Cameras Frame Rate vs. Reality: When 30 FPS Makes Your System Worse