Indoor Hazardous Area Station, Multi-Party Line, for 24VDC operation, CSA approved for selected Division 1 areas.

The Model 7805-002 includes a front-panel push button for paging, a 6-foot PVC coil cord, a noisecanceling microphone for reduced transmission of background noise, and sidetone circuitry. An electrical safety barrier mounted inside the housing creates an intrinsically-safe handset. It also includes a durable rotary switch for party line selection. @ 27 lbs.

Specifications
Power input....................................................................... 21-29 V dc; 1.2 A (optional negative ground or floating)
Dimensions ....................................... 13.1 H × 7.9 W × 5.6 D (8.9 including handset) inches; (332 × 200 × 143 mm)
Temperature range........................................................................................... -22 °F to +158 °F (-30 °C to +70 °C)
Shipping weight .............................................................................................................................. 27 lbs. (12.2 kg)
Handset
Material/finish......................................................................................................................................... Gray ABS
Microphone........................................................................................................ 10 ohms, noise-canceling, dynamic
Receiver................................................................................................................................... 150 ohms, dynamic
Cable ........................................................................................Retractile with sealed elbow, 6-foot extended length
Handset Amplifier
Output.................................................................................................................... 1.5 V nominal into 33-ohm load
Gain............................................................................................................................................. 55 dB, adjustable
Frequency response .............................................................. 250-4000 Hz, +0/-3 dB ref @ 1 kHz (1.5 VRMS) output
Distortion................................................................................................................. 1.5% maximum THD @ 1 kHz
Preset adjustments................................................................Microphone gain, sidetone adjustment, receiver volume
Speaker Amplifier
Output.................................................................................... @ 25 V dc: 12 watt minimum into 8- or 16-ohm load
Voltage gain.................................................................................................................. 20 dB minimum, adjustable
Frequency response ......................................................................................... 250-4,000 Hz; +0/-3 dB ref @ 1 kHz
Distortion...................................................................................................... 1% maximum THD @ 1 kHz/12 watts
Input impedance..................................................................................................... 50,000 ohm, minimum @ 1 kHz
Controls, preset adjustments .............................................................................................................Speaker volume
Explosion-proof Enclosure
Material/finish................................................................................................................. No. 359.2 Aluminum alloy