funktel FT4 Ex

Intrinsically safe TETRA handset

The FT4 Ex is an efficient TETRA radio handset specially designed for professional users. It has all functionalities of the FT4, but offers the intrinsically safe feature for use in highly sensitive environments. With its top equipment protection level, the funkwerk FT4 Ex fulfills highest health and safety requirements for equipment and can be used even in hazardous explosive atmospheres with conductive dust or special gases (i.e. hydrogen, acetylene, and mine gas) that are found in the chemical industry, in special refineries, or in mining industry.

The FT4 Ex is safe for use in gas and dust atmospheres with a high risk of explosion and is certified in accordance with the strict European ATEX as well as international IECEx directives:

Gas: II 2G Ex ib IIC T4 Gb
Dust: II 2D Ex ib IIIC T125°C IP6X Db
Hazardous Mining: I M2 Ex ib I Mb


  • Robust and impact-resistant housing
  • Edge rubber lining for shock absorption
  • Dust and waterproof (IP65), suitable for rough outdoor use
  • High Power 3 W transmission power
  • GNSS satellite receiver for four systems (GPS, Galileo, GLONASS, Beidou)
  • Extra bright 2.2" TFT display with brightness sensor
  • Micro SD slot for saving individual settings
  • Micro SIM card slot for end-to-end encryption (on request)
  • "Smart Ready" Bluetooth module BT4.0 (LE) for audio accessories
  • Audio connectors for wired audio accessories
  • Large red emergency call button
  • Messages and alarm signalling via RGB LEDs, signal tones and vibration
  • Participant list (telephone book) with up to 1000 entries
  • Group list with folder structure for up to 1000 groups
  • Security: Authentication and Air Interface Encryption Class 2 & 3


Carry Case

Charging Cable

Car Charger




  • Radio standard: TETRA (Trans European Trunked Radio)
  • Dimensions: 145 x 60 x 36 mm (without antenna)
  • Weight: 384 g incl. battery FT4 Ex 1700 mAh
  • Protection class: water, dust and shock protected - IP65
    • water-jet and dust proof acc. IEC 60529
  • Ring tone volume: max. 96 dB (A) at 30 cm distance(1)
  • Frequency range: 380-430 MHz or 410-470 MHz, others upon request
  • Channel Spacing: 25 kHz
  • Duplex Spacing: 10 MHz (at 380-470 MHz)
  • RF Transmission power: 1 W, performance class 4
  • Emission class: 25K0/W7D/W
  • Receiver class: A&B
  • Transmission power regulation: 3 steps of 5 dB

Explosion Protection

  • ATEX (Mining / Gas / Dust)
    • BVS 11 ATEX E 083 X: I M2 Ex ib I Mb / II 2 G Ex ib IIC T4 Gb / II 2D Ex ib IIIC T125°C IP6x Db
  • IECEx (Mining / Gas / Dust)
    • IECEx BVS 11.0099X: Ex ib I Mb / Ex ib IIC T4 Gb / Ex ib IIIC T125°C IP6x
  • Operating time: up to 14 h (5/5/90, without GPS), up to 18 h
  • Battery: Ex battery lithium ion, 3.7 V, 1700 mAh, incl. vibration

Fully integrated sGPS Receiver

  • Sensitivity: 182 dBw (-152 dBm) / 185 dBw (-155 dBm) (Acquisition / Tracking)
  • Accuracy: 5 meter (50% probability), 10 meter (95% probability)
  • Protocol ETSI Location Standard Reporting (LIP)
1)  depending on ring tone