VAR4 4x4 DSP Audio Router Installation Guide ASL Document Ref.: U-0450-1668.doc - Date: 02/12/09 Part Number: M0450_17
This equipment is designed and manufactured to conform to the following EC standards: EMC: EN55103-1/E1:1996, EN55103-2/E5:1996, EN50121-4:2006, ENV50204:1995 Safety: EN60065:2002 Failure to use the equipment in the manner described in the product literature will invalidate the warranty. A Declaration of Conformity statement to the above standards, and a list of auxiliary equipment used for compliance verification, is available on request. This product must be disposed of in accordance with the WEEE directive. Contents 1 General Information...3 2 Installation...6 3 Connections...9 4 Mechanical Dimensions...16 5 Safety and Precautions...17 Additional User Documentation: Additional reference information is available from the ASL website: www.asl-control.co.uk Copyright 2009 Application Solutions (Safety and Security) Limited Application Solutions (Safety and Security) Limited Unit 17 Cliffe Industrial Estate Lewes - East Sussex BN8 6JL - UK Tel: +44(0)1273 405411 Fax: +44(0)1273 405415 www.asl-control.co.uk All rights reserved. Information contained in this document is believed to be accurate, however no representation or warranty is given and Application Solutions (Safety and Security) Limited assumes no liability with respect to the accuracy of such information. Page 2 of 20
1 General Information Technical Specification Summary Supply Voltage Range... 18 to 40 V DC Auxiliary DC Supply for External Equipment... 18 36 V DC @ 100 ma Current Consumption... 400 ma @ 24 V DC supply (backlight on and sounder on) 350 ma @ 24 V DC supply (backlight off and sounder off) Temperature (storage and operating) / Humidity Range... 5 C to +50 C / 0% to 93% non-condensing Dimensions (H x W x D) / Weight... 44 mm x 436 mm x 222 mm (excl. handles and connectors) / 3 kg Changeover Fault Relay... 1 (non-monitored) Maximum Global Fault Relay Contact Current Rating... 500 ma Open-Collector Drive... 100 ma (2 x Speak Now LED / 2 x All Call LED / 2 x Remote Fault Outputs) Analogue Input Interfaces... 10 Non-monitored Mode Maximum External Fault Active-Low Input Voltage Threshold...2.5 V Monitored Mode Voltage Threshold... >3.7 V = Faulty: Open Circuit 0.8 V 3.7 V = Healthy: Inactive 0.3 V 0.8 V = Healthy: Active <0.3 V = Faulty: Short Circuit Digital Input Interfaces... 12 (opto-isolated with built-in resistor to suit voltages of +12 to +40 V) Remote I/O Unit (BMB01) Interfaces... 3 Universal Microphone/Line Audio Inputs...4 (balanced) Background Music Line Audio Inputs...2 * stereo pairs (internally mixed) (unbalanced) Audio Outputs... 4 (separate A and B outputs for each) Built-in DVA Storage...4 (2 x 66-second & 2 x 50-second) Hardware Bypass Fire Microphone Inputs... 2 (universal Microphone/Line Inputs 1 & 2) Mixed Listen-in Monitoring Audio Output... 1 Input Sensitivity and Impedance... Line = 20 dbu (77 mv) @ Z 10 kω Mic = 770 µv @ Z 10 kω Music (phono) = Suits 1-2 V RMS units Z 5 kω Input Overload Margin... 40 db Input Attenuator Range...0 to 63 db Input Phantom Power... 12 V DC Input Surveillance Tone...20 30 Hz (required level 0 to 40 dbfs) Input Equalisation...3-band plus LF Cut / ±12 db Output Level and Impedance... 0 dbu (nominal) @ Z=660 Ω Output Hard Limiter Threshold... +2.5 dbu Output Surveillance Tone... 30 Hz, 20 khz, or mixed (30 Hz+20 khz) / off, pulsed or continuous Output Equalisation... 8-band / ±12 db @ 125, 250, 500, 1 k, 2 k, 4 k, 8 k, 16 khz Number of Induction Loop Driven Output... up to 2 Gain Control Range... 0 db to 63 db THD Input to Output... <0.1% @ 1 khz Crosstalk... >70 db @ 1 khz Residual Noise...<78 dbu (A) S/N Line...>70 db (A) S/N Mic...>60 db (A) Frequency Response (input to output)... 100 Hz to 20 khz 3 db Page 3 of 20
Front Panel Indicators and Controls 2 STATUS INDICATORS power processor comms fault 4 ROTARY ENCODER 1 LCD DISPLAY 5 LOUDSPEAKER 3 KEYS Page 4 of 20
Indicators and Controls Description 1 LCD Display 2 LEDs 3 Keys 2 x 40 backlit alphanumeric display. Used to display the control menu, faults, and configuration data. power green Lit only if the unit is receiving DC power from both sources. processor green Flashes to show that the processor is healthy. comms fault SELECT BACK DEFAULT FAULT ACCEPT FAULT CLEAR AUDIO MON LAMP TEST 4 Rotary Encoder green amber Lit to indicate communication activity between the main processor and the amplifier units. Flashes on receipt of a message from an amplifier unit. Lit to indicate that the unit has detected a system fault. Flashes if a fault has not yet been accepted. The left and right arrow keys move the item selection in the direction selected, to the next item in the menu. The selected item is indicated by [brackets] around the selection. The up and down arrow keys toggle a selection, or increment a number, or a letter of the alphabet when editing. The rotary encoder acts in the same manner as these keys, and enables faster editing. Press after selecting an item to confirm the selection. Press after selecting an item to cancel the selection. If pressed repeatedly, this returns the display to the top-level menu. Press to clear previously configured text strings quickly during system configuration, or to return fields to their default values. Accepts all current faults, steadies the flashing fault LED indication, and turns off the audible alarm until a new fault condition occurs. Clears all faults and sets all connected equipment to the 'no faults' state, which also cancels any amplifier changeovers in effect. If there are any faults present in the system then they are detected anew, and reported again. Selects Audio Monitor sub-menu on the LCD display. Tests all indicators on the VAR and on all connected amplifier units. The sounder is also tested. The display shows LAMP + SOUNDER TEST and the menu locks during this time. This function is also available from the Tests menu. Multi-function: An alternative for the and arrow keys for fast increment and decrement of menu items. During Audio Monitoring it also acts as a volume control. 5 Loudspeaker Dual function: Alarm Sounder and Audio Monitor. Page 5 of 20
2 Installation Equipment and Tool Requirements The VAR4 Router. Cabling as specified in External Cabling Requirements (page 6) to suit your system design. A small flat-bladed screwdriver. A pair of wire cutters/strippers. A soldering iron. A 19-inch standard rack fitted with supporting rails and wired with DC power supply, signal, and control wiring, as required by your specific system design. External Cabling Requirements Signals Cable Description Termination Suggested Type DC supply Mic/Line input Unbalanced audio input A/B audio outputs RS232 RS485 Audio CAN Control ports 1 x 2-core cable Twisted pairs, individually screened 2-way pluggable Wago cage clamp terminal (male) 9-way standard D connector (male) Suitably rated screened 2-core cable Suitably rated cable with required number of pairs individually screened 1 x 2-core cable Phono plug (Left&Right) Suitably rated 2-core cable Twisted pairs, individually screened Serial data cable Twisted pair, overall screened Twisted pairs, overall screened Overall screened cable with required number of cores 15-way standard D connector (female) 9-way standard D connector (female) 9-way standard D connector (female) 9-way standard D connector (female) 25-way standard D connector (male) Suitably rated cable with required number of pairs individually screened As required to connect to the external device being used. Suitably rated foil screened cable (1 pair) Suitably rated foil screened cable (2 pairs) Suitably rated overall screened cable with required number of cores 1) Fire rated equivalent cables such as MICC or Pirelli FP200 should be used for safety critical applications. 2) For EMC compliance: Screened cables must be used where specified. All screen tails must be <3 cm. Refer to BS7671:2008 (Requirements for Electrical Installations) or other appropriate local standards for guidelines on maximum potential cable lengths given the actual installation parameters. Page 6 of 20
Recommended Installation Procedure Please read and observe the instructions and guidelines in Section 5 Safety and Precautions (page 17) prior to installation. Failure to follow these instructions and guidelines may cause personal injury and/or damage to the equipment. 1. Fit the VAR4 into a 19-inch standard equipment rack on supporting rails, and secure the unit in position using the fixing screws and washers provided; see Figure 1. Ensure that there is at least 1U of ventilated space between the unit and any source of heat (e.g. Amplifier Mainframes). Figure 1 Installing the VAR4 into the rack VENTILATION PANEL VAR4 VENTILATION PANEL 1U 1U 1U GENERIC 19-INCH 1U FORMAT ENSURE 1U VENTILATION PANELS ARE FITTED ABOVE AND BELOW THE EQUIPMENT. DO NOT OBSTRUCT VENTILATION HOLES. M6 POZIDRIV SCREW M6 PLAIN WASHER M6 CAGE NUT SUPPORTING RAILS MUST BE USED. 2. Set the rear-panel EARTH LIFT switch to the grounded position (, ON); see Figure 2. Only set the EARTH LIFT switch to the ungrounded position ( supply is used., OFF) if a +ve ground battery Figure 2 Setting the Earth Lift switch EARTH LIFT SWITCH: ON (RIGHT-HAND SIDE POSITION) Page 7 of 20
3. Ensure that the power supply from the central equipment rack is turned off. 4. Connect the field wiring as required; see Figure 3. Please refer to Section 3 Connections (page 9) for pinout details. Figure 3 Connecting the field wiring RS485 CONTROL PORTS AUDIO INPUTS (UNBALANCED) RS232 AUDIO CAN AUDIO OUTPUTS AUDIO INPUTS (BALANCED) 5. Connect the dual power supply to the rear panel connectors; see Figure 4. 1) Ensure power supply cabling is adequately rated. 2) Always route power supply cabling away from amplifier input cabling in the equipment rack to reduce the risk of noise pick-up. Figure 4 Connecting the DC power supply Wago Connectors: Use one of the two methods shown in the diagram below to terminate the cabling in the Wago connectors. When the screwdriver is removed, the bare end of the wire will be held securely by the contact spring. To remove the wire, reverse the process. DUAL DC POWER SUPPLY: 18-40 V DC 6. Power the unit on from the central equipment rack. 7. The installation is now complete and ready for system commissioning. Page 8 of 20
3 Connections UNBALANCED AUDIO INPUTS RS232 RS485 CONTROL PORT 2 B-OUTPUTS MUSIC A MUSIC B PSU1 PSU2 AUDIO-CAN CONTROL PORT 1 A-OUTPUTS INPUT 1 INPUT 2 INPUT 3 INPUT 4 POWER SUPPLY INPUTS BALANCED AUDIO INPUTS Page 9 of 20
VAR4 Rear Panel Silkscreen In order for customers to produce their own site documentation drawings of the front and rear panel are available from ASL. M0450_03-2 Issue: 1 Date: 27/04/01 Page 10 of 20
PSU 1 and PSU 2: Dual DC Power Supply Signal 2-way pluggable Wago cage clamp terminal (female) Description PSU 1 PSU 2 + +V supply (18 V to 40 V DC) - 0 V supply 1) PSU1 should come from an ASL Amplifier Mainframe AUX DC SUPPLY OUT terminations. Where possible, two mainframe outputs may be paralleled to feed PSU1 (one from each of two different mainframes) to provide a measure of current sharing and redundancy. 2) PSU2 should come directly from the battery via a fuse or breaker adequate to protect the cable from the potentially dangerous short circuit currents associated with SLA batteries. RS232: RS232 Port RX TX DTR GND 1 2 3 4 5 6 7 8 9 RTS CTS Standard 9-way D connector (male) Pin No Signal Description 1, 6, 9 - Not connected 2 RX RS232 Received Data 3 TX RS232 Transmitted Data 4 DTR Data Terminal Ready 5 GND Common Ground 7 RTS Request To Send 8 CTS Clear To Send EXP 1: RS485 Port 0V RS485 DXP 1 2 3 4 5 6 7 8 9 RS485 DXN Standard 9-way D connector (male) Pin No Signal Description 1, 2, 4, 6, 7, 8 - Not connected Do not make connections to these pins. 3 0V 0 V Reference 5 RS485DXP Data+ (EIA RS485 9600 baud) 9 RS485DXN Data- (EIA RS485 9600 baud) Page 11 of 20
AUDIO-CAN: Audio CAN Port 1 2 3 4 5 6 7 8 9 Standard 9-way D connector (male) Pin No Signal Description 1, 6, 8, 9 - Not connected 2 CAN_L Controller Area Network (Low) 3 GND 0 V Reference 4 AUDIO MON- Audio Monitor Bus 5 AUDIO MON+ 10 dbu nominal 7 CAN_H Controller Area Network (High) CAN_H INPUT 1 to INPUT 4: Balanced Audio Inputs 1 to 4 Standard 9-way D connector (female) DATA DXN 0V-SUPPLY AUDIO CAN_L MON- AUDIO GND MON+ AUDIO- 5 4 3 2 1 9 8 7 6 DATA DXP +SUPPLY AUDIO+ GND Pin No Signal Description 1 AUDIO+ Balanced audio + 2 AUDIO- Balanced audio - 3 0V-SUPPLY 0 V Supply 4, 8 - Not connected 5 DATA DXN Data- (EIA RS485 19200 baud) 6 GND Common ground (for cable screen) 7 +SUPPLY +V Supply 12 V DC fused at 500 ma ASL microphones require 18-40 V DC supply and should not be powered from this output. 9 DATA DXP Data+ (EIA RS485 19200 baud) MUSIC A and MUSIC B: Unbalanced Stereo Audio Inputs L R SIGNAL (+) GROUND (-) SIGNAL (+) GROUND (-) Phono Plug Pin No Signal Description L Left Unbalanced stereo audio input R Right As above The stereo signals are mixed to mono internally. Page 12 of 20
A-OUTPUTS and B-OUTPUTS: Audio Outputs 1 to 4 OUT-1A + - OUT-2A + - Audio A-OUTPUTS OUT-3A + - OUT-4A + - GROUND AUX-OUT + - 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 Standard 15-way D connector (male) Pin No Signal Description 1 OUT-1A+ 9 OUT-1A- 10 OUT-2A+ 3 OUT-2A- 4 OUT-3A+ 12 OUT-3A- 13 OUT-4A+ 6 OUT-4A- 7 AUX-OUT+ 15 AUX-OUT- 2, 5, 8, 11, 14 GROUND Balanced audio output 1 A (0 dbu nominal @ Z=660 Ω) Balanced audio output 2 A (0 dbu nominal @ Z=660 Ω) Balanced audio output 3 A (0 dbu nominal @ Z=660 Ω) Balanced audio output 4 A (0 dbu nominal @ Z=660 Ω) Balanced listen-in audio output (0 dbu nominal @ Z=660 Ω) Common ground for cable screen OUT-1B + - Audio B-OUTPUTS OUT-2B OUT-4B + - + - OUT-3B + - 1 2 3 4 5 6 7 8 9 10 11 12 13 GROUND 14 15 Standard 15-way D connector (male) Pin No Signal Description 1 OUT-1B+ 9 OUT-1B- 10 OUT-2B+ 3 OUT-2B- 4 OUT-3B+ 12 OUT-3B- 13 OUT-4B+ 6 OUT-4B- 2, 5, 7, 8, 11, 14, 15 GROUND Balanced audio output 1 B (0 dbu nominal @ Z=660 Ω) Balanced audio output 2 B (0 dbu nominal @ Z=660 Ω) Balanced audio output 3 B (0 dbu nominal @ Z=660 Ω) Balanced audio output 4 B (0 dbu nominal @ Z=660 Ω) Common ground for cable screen Page 13 of 20
CONTROL PORT 1: Control Port (Contacts 1 to 10 and other controls) REMOTE FAULT-1 REMOTE FAULT-2 FAULT RELAY COM N/0 N/C ALL-CALL-1 (FIRE MIC-1 PTT) ALL-CALL-2 (FIRE MIC-2 PTT) CONTACT-10 CONTACT-8 CONTACT-6 CONTACT-4 CONTACT-2 13 12 11 10 9 8 7 6 5 4 3 2 1 25 24 23 22 21 20 19 18 17 16 15 14 SPEAK-NOW LED-1 ALL-CALL-ONLY LED-1 SPEAK-NOW LED-2 ALL-CALL-ONLY LED -2 0V AUX POWER CONTACT-7 CONTACT-3 CONTACT-9 CONTACT-5 CONTACT-1 Standard 25-way D connector (female) Pin No Signal Description 1 CONTACT-1 Analogue Contact 1, internally pulled up to 5 V by 4k7 Ω 2 CONTACT-3 Analogue Contact 3, internally pulled up to 5 V by 4k7 Ω 3 CONTACT-5 Analogue Contact 5, internally pulled up to 5 V by 4k7 Ω 4 CONTACT-7 Analogue Contact 7, internally pulled up to 5 V by 4k7 Ω 5 CONTACT-9 Analogue Contact 9, internally pulled up to 5 V by 4k7 Ω 6 0V 0 V 7 ALL-CALL-2 (FIRE MIC-2 PTT) All-Call PTT (Input 2 Fire Microphone, internally pulled up to 5 V by 4k7 Ω) 8 ALL-CALL-1 (FIRE MIC-1 PTT) All-Call PTT (Input 1 Fire Microphone, internally pulled up to 5 V by 4k7 Ω) 9 N/C Fault relay N/C contact 10 COM Fault relay common contact 11 ALL-CALL-ONLY LED-1 All-Call-Only LED (Input 1 Fire Microphone, open-collector) 12 ALL-CALL-ONLY LED-2 All-Call-Only LED (Input 2 Fire Microphone, open-collector) 13 REMOTE FAULT-1 Remote Fault Output 1 (open-collector) 14 CONTACT-2 Analogue Contact 2, internally pulled up to 5 V by 4k7 Ω 15 CONTACT-4 Analogue Contact 4, internally pulled up to 5 V by 4k7 Ω 16 CONTACT-6 Analogue Contact 6, internally pulled up to 5 V by 4k7 Ω 17 CONTACT-8 Analogue Contact 8, internally pulled up to 5 V by 4k7 Ω 18 CONTACT-10 Analogue Contact 10, internally pulled up to 5 V by 4k7 Ω 19 AUX POWER Auxiliary power supply (18-36 V DC, fused at 100 ma) 20, 21 - Not connected 22 N/O Fault relay N/O contact 23 SPEAK-NOW LED-1 Speak Now LED (Input 1 Fire Microphone, open-collector) 24 REMOTE FAULT-2 Remote Fault Output 2 (open-collector) 25 SPEAK-NOW LED-2 Speak Now LED (Input 2 Fire Microphone, open-collector) Page 14 of 20
CONTROL PORT 2: Control Port (Contacts 11 to 22) CONTACT-22 CONTACT-20 CONTACT-18 CONTACT-16 CONTACT-14 CONTACT-12 13 12 11 10 9 8 7 6 5 4 3 2 1 25 24 23 22 21 20 19 18 17 16 15 14 CONTACT-21 CONTACT-19 CONTACT-17 CONTACT-15 CONTACT-13 CONTACT-11 Standard 25-way D connector (female) Pin No Signal Description 1 CONTACT-11+ Opto-isolated Contact 11 (opto-anode) 14 CONTACT-11- Opto-isolated Contact 11 (opto-cathode) 2 CONTACT-12+ Opto-isolated Contact 12 (opto-anode) 15 CONTACT-12- Opto-isolated Contact 12 (opto-cathode) 3 CONTACT-13+ Opto-isolated Contact 13 (opto-anode) 16 CONTACT-13- Opto-isolated Contact 13 (opto-cathode) 4 CONTACT-14+ Opto-isolated Contact 14 (opto-anode) 17 CONTACT-14- Opto-isolated Contact 14 (opto-cathode) 5 CONTACT-15+ Opto-isolated Contact 15 (opto-anode) 18 CONTACT-15- Opto-isolated Contact 15 (opto-cathode) 6 CONTACT-16+ Opto-isolated Contact 16 (opto-anode) 19 CONTACT-16- Opto-isolated Contact 16 (opto-cathode) 7 CONTACT-17+ Opto-isolated Contact 17 (opto-anode) 20 CONTACT-17- Opto-isolated Contact 17 (opto-cathode) 8 CONTACT-18+ Opto-isolated Contact 18 (opto-anode) 21 CONTACT-18- Opto-isolated Contact 18 (opto-cathode) 9 CONTACT-19+ Opto-isolated Contact 19 (opto-anode) 22 CONTACT-19- Opto-isolated Contact 19 (opto-cathode) 10 CONTACT-20+ Opto-isolated Contact 20 (opto-anode) 23 CONTACT-20- Opto-isolated Contact 20 (opto-cathode) 11 CONTACT-21+ Opto-isolated Contact 21 (opto-anode) 24 CONTACT-21- Opto-isolated Contact 21 (opto-cathode) 12 CONTACT-22+ Opto-isolated Contact 22 (opto-anode) 25 CONTACT-22- Opto-isolated Contact 22 (opto-cathode) 13 - Not connected 1) All contacts with built-in resistor to suit voltages of +12 to +40 V. 2) Internal pull-ups to +24 V enabled on all contacts of the port if none of the contacts of this particular port are configured for routing. If any contacts of the port are configured for routing, the internal pull-ups on all contacts of this particular port are disabled to provide a true volt-free interface. Page 15 of 20
4 Mechanical Dimensions Figure 5 VAR4 mechanical dimensions 436 mm 222 mm 252 mm 258 mm 44 mm = 1 U 483 mm THIRD ANGLE PROJECTION 1) ASL recommend a rear clearance depth of at least 110 mm for cabling. A 19-inch standard rack with 600 mm depth provides the required room for installation including the rear cabling. 2) In order for customers to produce their own site documentation drawings of the front and rear panel are available from ASL. Page 16 of 20
5 Safety and Precautions Environmental Always ensure adequate ventilation is provided for the equipment by fitting 1U ventilation panels above and below the equipment and do not obstruct ventilation holes. The temperature and humidity ranges shown in the specifications for this product must not be exceeded. This equipment must not be installed in an area that is subject to a corrosive atmosphere, excessive moisture or may allow water or other liquids to come into contact with the unit or its external connections. Electrical Safety Ensure power supply cabling is adequately rated. Always route power supply cabling away from amplifier input cabling in the equipment rack to reduce the risk of noise pick-up. Always replace blown fuses with the correct type and rating. Unpacking and Handling The equipment should be unpacked and inspected immediately on receipt. If damage has occurred please advise your carrier or supplier. This equipment contains electronic devices that are sensitive to electrostatic discharge. Please take precautions to avoid damage to the electronics by static electricity. It is advisable to retain the original equipment packing in the event that the equipment ever needs returning for service. Ensure that the name and address of the Authorised Distributor from whom you purchased the unit is recorded on the Service and Warranty page of this manual for future reference. Packing for Return for Repair All electronics assemblies must be properly packed in ESD protective packing for transport, to prevent physical and ESD damage. ESD Precautions This product contains static-sensitive devices. Observe ESD precautions when handling this product. An ESD bonding point is provided on the rear panel of the unit. EMC In the close proximity of some radio frequency transmitters, the signal to noise ratio of this product may be reduced. If this occurs, re-location of the equipment or the signal cables is recommended. The filler material used for packing for return for repair must be antistatic or static dissipative, as this may come into contact with exposed connectors, wiring, or PCB assemblies. The use of nonconductive filler material may cause damage to the electronic assemblies reducing their operational life, or even destroying them. Advice on packing the product for return can be provided by ASL. Lithium Battery This product contains a lithium battery. Danger of explosion if battery is incorrectly replaced. Replace only with the same or equivalent type. Dispose of battery carefully to avoid environmental damage. Do not dispose of battery in a fire. Page 17 of 20
Notes Page 18 of 20
Notes Page 19 of 20
Service and Warranty Name and Address of Authorised Distributor: This product carries a full warranty. For full details of warranty and service agreements, please contact the Authorised Distributor who supplied the product to you. Exclusions The warranty does NOT cover: 1. Customer misuse, including incorrect installation. 2. Damage other than manufacturing defects. 3. Transit / Courier damage. 4. Incorrect voltage or power supply used. 5. Incorrect input signal. 6. Abnormal environmental operating conditions. 7. Damage incurred by accident, fire, lightning or other hazard. 8. Modification to the unit or inexpert / attempted repair. 9. No fault found where no fault can be found after extensive testing, indicating user error or failure in ancillary equipment. 10. Electronic assemblies which are improperly packed when returned for repair or service. Should any of the above apply, Application Solutions (Safety and Security) Limited reserves the right to raise any relevant charges to the customer. Application Solutions (Safety and Security) Limited shall not be liable for any indirect, special or consequential loss or damage (including without limitation any loss of profits) arising from the use of this product or for any breach of this warranty. In the interest of continual product development, Application Solutions (Safety and Security) Limited reserves the right to make changes to product specification without notice or liability.