The system addresses the need to signal alarms relating to technical and pure gas storage/distribution systems.
The SDAM A5 control unit interfaces with five 4-20 mA transducers.
The unit displays alarms, statuses and measurements; when an alarm occurs, it activates audible and visual signalling. The operator acknowledges alarms using the silence button.
The control unit can be connected via a local network (RS 485) to one or more SDAMGUARD units or PCs for centralised monitoring at a staffed workstation; up to 253 control units can be connected on the same network. The control unit is programmed via PC, allowing the user to set the output relay function, zone identifier and digital or analogue input parameters, including the identification string, contact type (for digital inputs), measurement range and alarm thresholds (for analogue inputs), and alarm priority.

Functions
The SDAM A5 unit supports the following functions:
Monitoring of measurements and alarm signalling for five 4…20 mA inputs from pressure transducers.
Display of measurements and alarms, with identification of the relevant sensor, on a 2-line x 20-character backlit alphanumeric display.
Alarm status indication by flashing light (red LED = High priority, yellow LED = Medium priority) and activation of an audible warning device, with programmable reset time.
Audible warning device mute button on the front panel.
PC programming of: input identification strings, input measurement ranges, minimum and maximum alarm thresholds, alarm priority, alarm activation delay, classification of alarms as Clinical or Operational, and audible alarm reset time.
Electrical contact output with cumulative alarm or auxiliary siren control function.
SDAMNET local network interface.

Applications
Monitoring of measurements from detection sensors installed on systems.
Monitoring of pressure measurements at storage stations and on technical and pure gas lines.

Technical Data
Power supply: 230 Vac, 50/60 Hz, P max 5 VA, 0.5 A fuse
Visual indication: 2-line x 20-character backlit display
Medium-priority alarm: yellow LED Ø 20 mm
High-priority alarm: high-efficiency red LED Ø 20 mm
Audible indication: electromagnetic sounder, 85 dB at 1 metre, variable intensity via potentiometer
Inputs: No. 5 inputs for 4…20 mA transmitters with 2, 3 or 4 wires, 20 Vdc power supply provided by the unit
Alarm output: No. 1 relay contact, software-configurable as N.O. or N.C.
Vmax = 48 Vdc/Vac, Imax = 1 A
External enclosure: plastic, 9 modules, DIN 43380 rail mountable, dimensions 160 x 90 x (h) 58 mm
Local network interface: proprietary SDAMNET protocol on bidirectional RS485
Weight: 560 g
Operating temperature: 0…65°C
Certifications and reference standards: CEI-EN50081-1, CEI-EN50082-1, CEI-EN60601-1, Directive 73/23/EC, Directive 89/336/EC