BELAR Sentry 16 Audio & Status Alarm System
BELAR Sentry 16 Audio & Status Alarm System
The Belar Sentry 16 is an Audio/Logic monitoring system that continuously scans up to eight audio or program channels and eight logic or status inputs to detect changes in station operating parameters. It combines single-point monitoring of critical audio channels and equipment status, flexible local and remote alarm capabilities, and a computer interface for remote interrogation. The Sentry 16 senses changes in audio program levels, phase reversals occurring in the audio chain, and changes in equipment operational (logic) status.
Eight Analog (program) Input Channels, Eight Logic Input Channels; Unit control via front-panel pushbuttons and a sixteen-character alphanumeric dot-matrix display and an RS-232 interface; alarm readout through sixteen front-panel tri-color LEDs, the alphanumeric display window, an audible piezo-electric alarm, dry SPDT contacts from two alarm relays, an open-collector external alarm output, and the RS-232 port. Out-of-tolerance conditions and alarm functions are set independently in each channel.
Channels 18:
Double-ended, differential-input with semi-automatic input sensitivity adjustment.
Input Level Ranges: . −10 dBu to +12 dBu (0.25 Vrms to 3.08 Vrms)
22 dBu to 0 dBu (0.062 Vrms to 0.78 Vrms)
(The 22 dBu-to-0 dBu range is selected by an internal jumper in each channel.)
Input impedance: > 50 kΩ below 20 kHz
Frequency response: ± Ό dB, 2020,000 Hz
Alarm Level Threshold: . 10% to 95% of input reference level, user-selectable in each channel.
Alarm Level Resolution: .. better than 2% of full-scale
(Alarm level resolution is reduced for the 22 dBu-to-0 dBu input level range.)
Input connector: 20-conductor removable terminal block with screw-actuated wire clamps.
Alarms may be set to trigger on logic highs, logic lows, low-to-high transitions, or high-to-low transitions, by user selection.
Channels 912:
Optically isolated, floating logic inputs. Compatible with unloaded TTL-family
and 5-V CMOS and HCMOS-family logic with totem-pole outputs. Schmitt-trigger
inputs.
Maximum common-mode DC: <275 VDC.
Maximum differential input: . < 20 VDC.
Channels 1316:
HCMOS (5-V) with Schmitt trigger inputs. Compatible with unloaded TTL-family
and 5-V CMOS and HCMOS-family logic with totem-pole outputs. Internal 10-kΩ
pullup to + 5 VDC.
Required swing: ... 0.6 VDC for logic low, 3.3 VDC for logic high.
Maximum input: < 20 VDC.
Input connector: 20-conductor removable terminal block with screw-actuated wire clamps.
Two Alarm Relays: Alarm Relay and Alarm Timer Relay. Both
relays have dry, form C contacts rated for 28 VDC maximum switched voltage, 500
milliamps maximum switched current, and 3 watts maximum switched power.
External Alarm: One open-collector NPN transistor, limited to less than +40VDC
with respect to the Sentry 16 chassis ground, 50 milliamps maximum collector
current, and less than about 250 milliwatts dissipation.
Analog & Logic Input Connectors:
Two, twenty-conductor, removable, clamping screw terminal blocks with 5 mm lead spacing (Weidmuller BLZ series).
Serial Interface: RS-232
Unit Interface: Wizard Standard Interface
Dimensions: ... 1 EIA Rack Unit, 1.75 H x 16 D x 19 W
Power Requirements: ... 15 watts, 100240 VAC, 5060 Hz
Unit Weight: ... 6.6 pounds, 3.0 kg
Shipping Weight: . ... 12 pounds, 5.5 kg
© Copyright 2004 Belar Electronics Laboratory, Inc. All rights reserved.
Specifications subject to change without prior notice.
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