DTT-V-Z / DTR-V-Z Series
IECEx Zone 1 VoIP ATEX Fixed Telephones
DTT-V-Z / DTR-V-Z Series
The DTT-V-Z and DTR-V-Z Series are IECEx certified industrial VoIP telephones designed for permanent installation in Zone 1 and Zone 21 hazardous areas. These ATEX fixed telephones provide reliable SIP-based communication in environments where explosive gas or dust atmospheres may be present during normal operation.
Designed for integration with modern IP-PBX systems, the range combines rugged industrial construction with advanced VoIP functionality, making it suitable for refineries, chemical processing plants, utilities and heavy industrial facilities.
Key Features
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IECEx Zone 1 and Zone 21 certified (T4 rated)
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SIP (RFC 3261) compliant VoIP communication
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Power over Ethernet (802.3at) or 24VDC supply
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IP66, NEMA 4X high impact static dissipative housing
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Desk or wall mount configurations
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Heavy duty or armoured handset cord options
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Direct call ringdown variants available
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Optional push-to-talk handset (DTT models)
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Operating temperature range: -30°C to +60°C
Options
DTT-50-V-Z – Silicone Keypad/Handset/Heavy duty Curly Cord
DTT-60-V-Z – Silicone Keypad/Handset/Armored Cord
DTR-51-V-Z – Direct Call Ringdown/Volume Control Handset/Heavy duty Curly Cord
DTR-61-V-Z – Direct Call Ringdown/Volume Control Handset/Armored Cord
Electrical Performance
| Parameter | Specification |
|---|---|
| Network Rate | 10/100 Mbps |
| Protocol | SIP (RFC 3261 Compliant) |
| Codecs Supported | G.711 (Mu-law) |
| G.711 (A-law) | |
| G.729.1 (G729) | |
| G.729EV | |
| G.722.1 (SIREN7) | |
| G.722.2 (AMR-WB) |
Electrical Specifications
| Parameter | Specification |
|---|---|
| Power Requirements – Method 1 | POE 802.3at (via POE Switch or POE Injector) |
| Power Requirements – Method 2 | 24VDC @ 1A |
| Auxiliary Relay | 4.9A, 250VAC/DC SPDT |
| Optical Isolated Inputs (qty 4) | 15mA Max |
| On-board current limited for 3–5V Input | |
| Optical Isolated Outputs (qty 4) | Max Switching Voltage: 30VDC @ 150mA |
Mechanical Specifications
| Parameter | Specification |
|---|---|
| Hook Switch (Cradle Switch) Life | > 1,000,000 Operations |
| Housing Material | High impact carbon loaded BMC |
| Handset Material | High impact carbon loaded BMC |
| Net Weight | 8.68 lbs (3.95 kg) |
| Mounting | Desk or Wall |
| Microphone | Noise Cancelling |
| Receiver | Hearing Aid Compatible (w/t-coil) |
| Hardware Material | Stainless Steel |
| Wiring Access | 2 × M20 & 1 × M12 Cable Gland Entry Points |
Environmental
| Parameter | Specification |
|---|---|
| Service Temperature | -22° to +140°F (-30° to +60°C) |
| Storage Temperature | -58° to +176°F (-50° to +80°C) |
| LCD Note | Below -4°F (-20°C) the LCD may stop functioning. Telephone operation is unaffected. |
| Ingress Protection | (NEMA 4X) IP66 |
| Humidity | 0 to 95% RH |
Compliance
| Standard / Approval | Details |
|---|---|
| IECEx Zone | Ex eb ib mb IIC T4 Gb |
| Ex ib mb tb IIIC T135°C Db | |
| Ambient Range | Ta = -30°C to +60°C |
| FCC | Title 47, Part 15 |
| Canada | ICES-003 / NMB-A |
| EU Directives | 2014/30/EU & 2014/35/EU |
| Standards | EN55032:2015 |
| EN55035:2017/A11:2020 |
Shipping Specifications
| Parameter | Specification |
|---|---|
| Shipping Carton Weight | 10.7 lbs (4.9 kg) |
| Shipping Carton Dimensions (L × W × D) | 16.0″ × 10.5″ × 9.5″ (407 × 267 × 242 mm) |
VoIP Sitara Class Control Module – Configuration Enhancements
| Feature |
|---|
| One-click activation for device changes (no full reboot required) |
| Keypad mode select – ringdown or lockout keypad functionality |
| Timed auto-answer with selectable ring count |
| User defined I/O monitoring and notification events with iGuard |
| Improved auto provisioning for firmware and configuration updates |
VoIP Sitara Class Control Module – Hardware Enhancements
| Feature |
|---|
| Expanded keypad interface for custom applications |
| Screwless terminal block for easier installation |
| User controllable DC relay – 4.9A @ 250VAC rated contacts |
| 4 opto-isolated inputs for external sensor monitoring |
| 4 opto-isolated outputs for control of external devices |
Ordering Information
| Order No. | Description |
|---|---|
| P3050 | DTT-50-V-Z – Telephone / Silicon Keypad / Volume Control on Keypad / Curly Cord |
| P3052 | DTT-60-V-Z – Telephone / Silicon Keypad / Volume Control on Keypad / Armored Cord |
| P3053 | DTR-51-V-Z – Ringdown Telephone / Curly Handset Cord |
| P3054 | DTR-61-V-Z – Ringdown Telephone / Armored Handset Cord |
Options
| Option Code | Description |
|---|---|
| 20C-DTR | 20ft (6.1m) Curly Handset Cord |
| 20A-DTR | 20ft (6.1m) Armored Handset Cord |
| Headset | Contact Guardian Telecom sales representative for details |
| Custom Colours | Available subject to minimum quantities or premiums |
