MEDC Ex FernTel - Manual (Page 4)

4
• Make the connections while the device is open
• When the work is done, plug the keypad back on, and place the keypad insert
back on the lower part of the device.
Make sure the seal is correctly positioned and in perfect working order. Then tighten
the fastening screws in a diagonal pattern.
– Only blind plugs and cable glands as prescribed by the manufacturer may be used.
Should these points not be observed, the explosion protection of the device cannot be
guaranteed. The device then poses a potential threat to the user’s life and can cause
the ignition of an explosive atmosphere.
CE symbol
The FernTel 3 Z2 fulfils the demands of the R&TTE Directive 1995/5/EC and the ATEX
directive 94/9/EC. The CE symbol confirms the conformity of the device with the
above-mentioned Directives.
EMC-Directive
The device complies with the requirements of the new EMC-directive 2004/108/EC, the
low voltage directive 2006/95/EC and the R&TTE directive 1999/5/EC.
The conformity with the above directives is confirmed by the CE sign.
Technical Specifications
Electrical characteristics
Connection data DC voltage La / Lb: Ui = 66 Vdc
Ringing voltage 24 Vac - 90 Vac / 16 Hz…68 Hz
Sounder input
impedance
≥
6.0 k
Ω
at 25 Hz
≥
3.5 k
Ω
at 50 Hz
General specifications
Enquiry key (flash) for dual-tone
multifrequency only
80 ms, 120 ms, 600 ms
Dialling procedure Dual-tone multifrequency Frequencies according to ITU-T Q.23
Tone duration unlimited or 90 ms
Pulse dialling Pulse/Pause ratio
1.5: 1 (60 ms/40 ms) or
2:1 (66.7/33.3 ms)
Ringing volume max. approx. 95 dB(A) at 1 m distance