Distance from Switch
If the telephone reception is very weak or the phone functions intermittently, it is likely that the unit has been installed too far from the switch (private branch exchange/PBX) or too many [...]
Incorrect Power Source
By far the most common problem is connecting the telephone to the wrong power supply. All telephones are to be connected to the telephone line. This line is not the same as standard building [...]
Refer to applicable operation & install manual
Guardian telephones and accessories are thoroughly tested before shipment. Considering their construction it is unlikely the equipment will be damaged during shipment. If the external equipment [...]
Is a handset the only method of using the EXT-401 Explosion Proof Telephone?
Guardian offers an aviator style headset with a built-in microphone and a hand-controlled hook switch.
Why does the EXT-401 Explosion Proof Telephone require an external signal?
The nature of the EXT-401 explosion proof enclosure with its thick, sealed copper free aluminum walls makes it impractical to effectively transmit sound from the inside of the enclosure. Guardian [...]
What can be done to improve telephone service in a noisy environment?
Dealing with noise is a progression. Noise reduction is standard on all of Guardian’s telephones. All Guardian Telecom telephones can be equipped with noise cancelling microphones. (The EXT-401 [...]
Are there other methods of telephone signaling to deal with a high noise environment?
Sound, visual or a combination of the two, provide viable methods for signaling within high noise environments. Guardian designs and manufacturers our own high quality, rugged and reliable [...]
Is a handset the only method of using the EXT-401 Explosion Proof Telephone?
Guardian offers an aviator style headset with a built-in microphone and hand-controlled hook switch.
What is the reason for an explosion proof telephone?
Simply put, explosion proof apparatuses including Telephones, Page/Talk Stations, Talk/Back Stations, Loudspeakers and Ringers are used to protect lives and property in hazardous locations (Class [...]
What does non-incendive mean?
Non-incendive technology relies on design and construction to produce a piece of equipment that performs safely and effectively without arcing or sparking. A non-incendive telephone’s components [...]
What do the Hazardous Area classifications mean?
Various standards and regulatory bodies establish classifications in North America, Europe and other jurisdictions around the world. They reflect environmental conditions and elements within that [...]
What is a Hazardous Area?
Hazardous locations are defined as places where concentrations of flammable gases, vapors, or dusts occur. Electrical equipment that is installed in hazardous locations are designed and tested to [...]
