SAX-D Area Alarm

Medical Gas Pipeline Area Alarm System

Features

The SAX-D Area Alarm is a digitally controlled medical gas monitoring system designed to provide clear, high-visibility monitoring of up to six independent piped medical gases downstream of the final AVSU.

• Monitors up to 6 gases using 4–20mA pressure or vacuum transducers
• Individual 1.7” OLED display per gas
• High- and low-pressure alarm indication
• Pressure Drop early warning indication
• System fault monitoring (data, wiring and mains failure)
• Fail-safe common fault relay output
• Temporary mute with 15-minute auto re-sound
• Engineer lockout facility for maintenance periods
• Bluetooth configuration interface (engineer use only)
• Modbus and SAX Bus interface capability
• Fully HTM 02-01 compliant

The SAX-D combines modern digital monitoring with proven medical gas alarm principles, offering enhanced clarity and system integration while maintaining compatibility with existing infrastructure.

Application

The SAX-D Area Alarm is used to monitor medical gas pipeline pressures within wards, theatres and clinical areas.

Transducers are installed downstream of the final AVSU and monitor:

• High pressure
• Low pressure
• Vacuum (low pressure only)

Each gas is displayed on its own OLED screen, providing clear colour-coded status indication:

• Green – Normal
• Yellow – Pressure Drop
• Red – High or Low Pressure

The system continuously monitors:

• Transducer wiring integrity
• Data communication between Encoder and Displays
• Mains power condition

A fault will result in:

• A system fault alarm
• Visual indication on the affected channel(s)
• Audible alarm activation

Connection

The SAX-D system comprises an Encoder (Transmitter) and one or more Display units.

The Encoder converts 4–20mA transducer signals and transmits multiplexed data to the Display units via screened cable.

A 4-core cable is run from the Encoder to the Display, comprising:

• Positive supply
• Negative supply
• Data A
• Data B

Separate 2-core cables are run from each pressure or vacuum transducer to the Encoder.

Optional connections include:

• Common Fault Relay output
• SAX Bus interface to existing SAX-6 alarms
• Modbus RS485 interface

All cable screens must be earthed at BOTH ends.

Installation Requirements

Installation must be carried out by competent personnel in accordance with HTM 02-01 and local regulations.

Electrical Supply

• 230V AC supply
• Fused at 3 amps
• Fed from the essential (emergency) supply

Signal Cabling

• 4-core screened cable between Encoder and Display
• 2-core cable per transducer input
• Maximum 100 metres between Encoder and Displays

Optional Equipment

• SAX-6 (3 or 6 Gas) adaptor mounting plates
• SA-6 (3 or 6 Gas) retrofit fascia plates

Equipment Warranty

Standard Warranty
Alarms returned to our works which have failed due to faulty parts or manufacture will be repaired or replaced without charge for parts and labour.

10-Year Compatibility Warranty
Install the SAX-D with confidence. Equipment will remain available to modify or extend the system for at least 10 years from installation.

Compliance

HTM 02-01 ✔
ISO 13485 ✔
EN ISO 7396-1 ✔
IEC 62304 (Class A) ✔
UK MDR / EU MDR ✔