Guardian’s ATEX-IEC rated DTT-50-Z analog telephone with armored handset cord meets stringent Zone 1 safety zone requirements while still providing a high level of functions and features needed to keep your team communicating and operating both efficiently and effectively.

The DTT-60-Z is housed in a stylish IP66, static dissipative, high impact thermoset industrial housing and is RoHS compliant. Versatility is built-in right in, letting the user configure for desktop or wall mounting.

For use in Zone 1, Zone 21 environments.

Standards Compliance


ATEX – Zone 1
• II 2G Ex e ib mb IIC T5 Gb
II 2D Ex ib mb tb IIIC T100°C Db
-30°C ≤ Ta ≤ +60°C
• II 2G Ex e ib mb IIC T6 Gb
II 2D Ex ib mb tb IIIC T85°C Db
-30°C ≤ Ta ≤ +45°C
• EC Legislation
ATEX Directive 94/9/EC, RTTE directive 1999/5/EC
• EC Harmonized Standards
EN60079-0:2006, EN60079-7:2007,
EN60079-11:2007, EN60079-18:2004, EN60950-1:2006


A product complies with essential requirements of the relevant European health, safety and environmental protection legislation, in practice by many of the so-called Product Directives.

Allows for free trade between member states including EFTA & European Union (EU) single market.

Product Features

  • ATEX Zone 1, Zone 21 approved – T5 & T6 rated
  • Wide temperature range from -22°F to +140°F (-30°C to +60°C)
  • IP66, static dissipative, high impact thermoset industrial housing and handset
  • Reversible faceplate for desktop or wall mount configurations
  • Audio modes – handset & hands-free speaker phone or optional headsets. Note: when the optional headset is used the speaker phone feature is not available
  • Corrosion resistant hardware
  • Noise canceling microphone
  • Surge arrestor protects the user in the event of a high voltage spike
  • Self resetting fuse prevents damage to the electronic circuits in the event of a high voltage spike on the telephone line
  • Magnetic reed hook switch to reduce parts subject to wear
  • Factory set to tone (DTMF) Operation
  • Pulse dialing can be software configured in the field, 40:60 or 33:66
  • Removable handset retainer latches on cradle
  • Urethane coated water tight silicon keypad
  • Link, Release, Redial and Flash keys
  • Hearing-aid compatible (HAC) receiver
  • Receiver Volume Control provides a 16 dB range
  • Ergonomic heavy duty handset
  • Heavy duty armored handset cord
  • Built in ring detect relay to switch up to 240V @ 5A
  • Back lit LCD display – 2 line x 16 character: English, French or Spanish
  • 20 number memory including 10 quick dial
  • Programmable auto hang-up timer
  • Two M20 and one M12 access ports
  • Field repairable by authorized personnel
  • Does not require external power – operates on telephone line power
  • Order number: P9052
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