Explosion-Proof Wall-Mount IP Intercom for Hazardous Areas
IP66 • Ex db IIB T6 Gb • 30W External Speaker Output • Handset • Number Keys • One-Key Alarm
T-7731 Ex db IIB T6 Gb IP66
Certified for hazardous environments. The T-7731 is an explosion-proof IP intercom certified Ex db IIB T6 Gb for use in Zone 1 and Zone 2 hazardous areas. With IP66 weatherproofing, a robust handset, and 30W external speaker output, it provides reliable communication in oil & gas, chemical plants, mining, and other explosive atmospheres.
| Model Number | T-7731 |
| Product Type | Explosion-Proof Wall-Mount IP Intercom |
| Explosion Protection | Ex db IIB T6 Gb (Zone 1, Zone 2) |
| Ingress Protection | IP66 (dust-tight, powerful water jets) |
| Enclosure Material | Heavy-duty cast aluminum, epoxy-coated |
| External Speaker Output | 30W (drives external horn speaker) |
| Handset | Explosion-proof handset with PTT |
| Keypad | 12-key numeric keypad, one-key alarm |
| Network | 10/100Mbps Ethernet (RJ45) |
| Audio Protocols | TCP/IP, UDP, HTTP, RTP, RTSP, SIP |
| Audio Codecs | MP3, WAV, PCM, G.711, G.722 |
| Audio Communication | Full-Duplex with Echo Cancellation |
| Power Supply | PoE (802.3af) or DC 24V |
| Power Consumption | ≤ 15W |
| Mounting | Wall mount with explosion-proof glands |
| Operating Temperature | -20°C – 50°C |
| Humidity | 10% – 95% non-condensing |
| Color | Gray / Industrial |
| Certifications | Ex db IIB T6 Gb, CE, FCC, RoHS, IP66 |
Ex = Explosion-protected • db = Flameproof enclosure • IIB = Gas group (ethylene, coke oven gas) • T6 = 85°C max surface temperature • Gb = Equipment protection level for Zone 1 (high risk). Certified for hazardous areas with explosive gases.
The T-7731 is a specialized explosion-proof IP intercom designed for the most demanding hazardous environments. With Ex db IIB T6 Gb certification, it is approved for use in Zone 1 and Zone 2 areas where explosive gases may be present – oil rigs, chemical plants, refineries, mines, and grain handling facilities.
Certified Safety: The T-7731's flameproof enclosure is designed to contain any internal explosion and prevent ignition of the surrounding atmosphere. The robust cast aluminum housing with epoxy coating provides maximum protection in corrosive industrial environments.
Complete Communication: The unit includes an explosion-proof handset with push-to-talk operation, a 12-key numeric keypad for dialing, and a dedicated one-key alarm button for instant emergency calls. An external 30W speaker output drives a horn speaker for powerful paging.
IP66 Weatherproof: In addition to explosion protection, the T-7731 is IP66 rated – dust-tight and protected against powerful water jets, making it suitable for outdoor installations in all weather conditions.
Network Integration: Full SIP support enables direct integration with VoIP phone systems, intercom networks, and public address platforms. Power via PoE simplifies installation in hazardous areas.
Certified for Zone 1/2 hazardous areas. Flameproof enclosure prevents ignition.
Dust-tight and protected against powerful water jets. Ideal for outdoor industrial use.
Explosion-proof handset with PTT, 12-key dial pad, and one-key alarm button.
Drive external horn speakers for powerful paging in noisy environments.
| Certification | Details |
|---|---|
| Ex Marking | Ex db IIB T6 Gb |
| Protection Type | Flameproof enclosure (db) |
| Gas Group | IIB (ethylene, coke oven gas, etc.) |
| Temperature Class | T6 (85°C max surface temp) |
| EPL Level | Gb (Zone 1 – high risk) |
| Applicable Zones | Zone 1, Zone 2 |
Ex Certified
Zone 1 hazardous areas
| Control | Description |
|---|---|
| Handset | Explosion-proof, PTT (push-to-talk) button |
| Keypad | 12-key numeric (0-9, *, #) |
| Alarm Button | Red one-key emergency call |
| LED Indicators | Power, call status, alarm |
Heavy-duty handset
PTT operation
| Parameter | Specification |
|---|---|
| Output Power | 30W RMS |
| Speaker Type | External horn speaker (not included) |
| Connection | Explosion-proof gland, 2-core cable |
| Use Case | Paging, announcements, alarms |
30W output
Drive external horn
| Parameter | Rating |
|---|---|
| Ingress Protection | IP66 |
| Operating Temperature | -20°C to 50°C |
| Storage Temperature | -30°C to 70°C |
| Humidity | 10% – 95% non-condensing |
| Corrosion Resistance | Epoxy-coated cast aluminum |
IP66 – dust-tight, water jets
Wide temperature range
The T-7731 must be installed by certified personnel following local regulations for hazardous area installations. All cable entries must use approved explosion-proof glands. The unit is designed for Zone 1 and Zone 2 areas with IIB gases. Not suitable for Zone 0 or IIC gases (hydrogen, acetylene).
| Model | Type | Protection | Key Feature |
|---|---|---|---|
| T-7710 | One-key outdoor | IP55 | 500W amp, solar ready |
| T-7731 | Explosion-proof | Ex db IIB T6 Gb, IP66 | Handset, 30W ext |
| T-7732 | Industrial outdoor | IP54 | Steel casing, anti-tamper |
| T-7730/P | IP66 decoding terminal | IP66 | 16/30W amp |
The T-7731 is specifically certified for hazardous areas with explosive gases. Compare to other models:
Choose T-7731 only when explosive atmosphere certification is required.
The T-7731 must be installed in accordance with local regulations for explosive atmospheres. Use only certified explosion-proof cable glands and conduit. Installation must be performed by qualified personnel. The unit is certified for IIB gases only – not for IIC (hydrogen, acetylene).
The T-7731 supports standard SIP protocol for seamless integration with VoIP phone systems. Register to any SIP PBX for direct dialing, intercom groups, and emergency call routing. One-key alarm can be programmed to call a specific extension or group.
T-7731 (wall-mounted) with explosion-proof horn speaker
Located in Zone 1 processing area. Connected via PoE from safe area. External 30W horn speaker provides paging. Handset allows two-way communication with control room. One-key alarm triggers emergency response.