Sensors and other Analogue Addressable Devices
Photoelectric Sensor 
The detection chamber consists of an LED and photo-diode arrangement. The chamber is designed so that light emitted by the LED canot normally reach the photo-diode. When smoke particles enter the chamber the light is scattered and some of this light falls on the photo-diode.
This is converted into an electronic signal, filtered and then transmitted as the analogue value. The chamber is easily removed or replaced for cleaning and utilises a unique baffle design which allows smoke to enter the chamber while keeping out ambient light.
The ASX Range Photoelectric Smoke Sensor with 'Flat Responce Technology' is suited to wide range of applications. It can be installed in areas where traditionally photoelectric and ionisation sensors have been used, thereby providing a simipler solution for system designers. A non-publsing varient where a flashing LED is not acceptable is also available.
ALG-E/ALG-E(NP)
ALG-E/(Black)
| PROPERTY | VALUE |
| Disposable chamber | Yes |
| Stand-by current, Low power mode (typ) | 120uA |
| Stand-by current, Normal (typ) | 310uA |
| Transmission method | Digital communication using ESP |
| Operating temp. range | -10°C to +50°C |
| Storage temp. range | -30°C to +60°C |
| Maximum humidity | 95%RH - Non condensing (at 40°C) |
| Colour | Ivory White |
| Case material | ABS, Black |
| Diameter | 100 |
| Height with YBN-R/3 base | 46 |
| Compatible base | YBN-R/3, YBN-R/3(Black), CHQ-BS, YBO-R/SCI |
| Base fixing centre | 48mm through to 74mm |
| Weight (incl. base) | 95g(145g) |
*As out policy is one of constant product improvement the right is therefore reserved to modify product specifications without prior notice.
Ionisation Sensor
A single radioactive source ionises two chambers allowing a small DC current to flow between the electronic in each chamber. Smoke can freely enter the outer chamber whilst the inner chamber is virtually sealed. Smoke entering the outer chamber causes a reduction in the DC current, the imbalance between the two currents is proportional to smoke density which is converted, filtered and transmitted as the analogue value. The thresholds, on either smoke sensor, can be adjusted to contamination by utilising the built in fire test facility.
The ASX Range Ionisation Sensor is still provided for product continuity in certain applications. A non-pulsing varient for architectural applications where a flashing LED is not acceptable is also available.
AIE-E/AIE-E(NP)
| PROPERTY | VALUE |
| Stand-by current, Low power mode (typ) | 140uA |
| Stand-by current, Normal (typ) | 350uA |
| Transmission method | Digital communication using ESP |
| Radioactive source | Am241 iuCi |
| Operating temp. range | -10°C to +50°C |
| Storage temp. range | -30°C to +60°C |
| Case material | 95%RH - Non condensing (at 40°C) |
| Colour | Ivory White |
| Case material | ABS |
| Diameter | 100 |
| Height with YBN-R/3 base | 52 |
| Compatible base | YBN-R/3, YBN-R/3(Black), CHQ-BS, YBO-R/SCI |
| Base fixing centre | 48mm through to 74mm |
| Weight (incl. base) | 115g(165g) |
*As out policy is one of constant product improvement the right is therefore reserved to modify product specifications without prior notice.
Heat Sensor
The Heat Sensor incorporates a highly linear thermistor circuit, with the thermistor being mounted externally. A voltage is produced proportional to temperature which is scaled linearised and transmitted as the analogue value. The fire alarm control panel can adjust the sensor threshold for different Standard's requirements. Rate of rise functions are implemented within the fire alarm control panel.
The ASX Range Heat Sensor provides accurate temperture measurement data to the fire alarm control panel which calculates the necessary fixed temperature and rate of the rise functions as required by the approriate standards. The responce of the temperature measurement circuit allows it to be used for a Grade 1,2 or 3 device as defined by EN54 Part 5. The Heat Sensor is particularly suited to environments where high ambient temperatures exists such as boiler and drying rooms and where smoke sensors are unsuitable because of the presence of steam or cooking fumes such as in a kitchen. A non-pulsing varient for architectural applications where a flashing LED is not acceptable is also available.
ATG-E/ATG-E(NP)
| PROPERTY | VALUE |
| Stand-by current, Low power mode (typ) | 90uA |
| Stand-by current, Normal (typ) | 350uA |
| Transmission method | Digital communication using ESP |
| Operating temp. range | -10°C to +50°C |
| Storage temp. range | -30°C to +70°C |
| Maximum humidity | 95%RH - Non condensing (at 40°C) |
| Colour | Ivory White |
| Case material | Polycarbonate |
| Supply Voltage | 100 |
| Height with YBN-R/3 base | 48 |
| Compatible base | YBN-R/3, YBN-R/3(Black), CHQ-BS, YBO-R/SCI |
| Base fixing centre | 48mm through to 74mm |
| Weight (incl. base) | 90g(140g) |
*As out policy is one of constant product improvement the right is therefore reserved to modify product specifications without prior notice.
Multi-Sensor
The Multi-Sensor incorporates a 'Flat Responce' photoelectric chamber and a highly linear thermistor circuit within the same housing. The basic operation for the two sensing elements is the same as the Photoelectric and Heat Sensor descriptions above. The Multi-Sensor has the ability to operate in three different modes, which are converted from the control panel. The different modes allow either the Photoelectric or the Thermal element or both elements to be active in the fire decision.
The ASX Range Multi-Sensor provides smoke and heat sensing within one housing allowing the multiple analogue channels of the ESP protocol to communicate more than one of the sensing elements back to the fire alarm control panel.
Using the same chamber as the ALG-E, the sensor has 'Flat Response' characteristics and a removable chamber as standard. The sensor can be operated in any of the following three modes, photoelectric only, heat only, combination of photoelectric and heat (Multi-mode).
The sensor has been primarily designed for difficult environments where Photoelectric or Heat singularly covers the fire requirements. Such an application could be a smoking area where a pure smoke sensor would be liable to produce unwanted alarms and a heat would not detect a smouldering fire. The multi-sensor, having the facility to be switched between the different sensing elements under fire alarm panel control, could in this example, be active during the day with either the photoelectric or combined elements active when the room was unoccupied - providing comprehensive fire coverage.
ACA-E
| PROPERTY | VALUE |
| Disposable chamber | Yes |
| Stand-by current, Low power mode (typ) | 120uA |
| Stand-by current, Normal (typ) | 450uA |
| Transmission method | Digital communication using ESP |
| Operating temp. range | -10°C to +50°C |
| Storage temp. range | -30°C to +70°C |
| Maximum humidity | 95%RH - Non condensing (at 40°C) |
| Colour | Ivory White |
| Case material | ABS |
| Supply Voltage | 100 |
| Height with YBN-R/3 base | 46 |
| Compatible base | YBN-R/3, YBN-R/3(Black), CHQ-BS, YBO-R/SCI |
| Base fixing centre | 48mm through to 74mm |
| Weight (incl. base) | 100g(150g) |
*As out policy is one of constant product improvement the right is therefore reserved to modify product specifications without prior notice.
Flat Response Technology
The ASX Range Photoelectric Sensor and Muilt-Sensor have been designed using the unique 'Flat Responce Technology', which enables the sensor to be equally senstive to a much wider range of combustible materials, allowing the sensor threshold level to be increased This improves the signal to noise radio and reduces susceptibility to false alarms.
The graph below shows the responce of the Photoelectric Sensor removes the need to use ionisation sensors in the majority of applications. This revolutionary design has been achieved without the need for adding costly heat elements and is part of the standard product range. System design is therefore easier and overcomes cleaning and disposal problems when using ionisation sensors.
Address Setting
Each sensor has its ESP loop address set between 1 and 127 by a simple solid state
progemming method. The sensor's address is stored in a nonvolalite memory within the sensor, the address can be changed from the factory default by using a hand-held programmer. This technique removes the need to set DIL switches and is a quick and reliable solution to address setting.
Installation and Maintenance
Each sensor has been designed with a one piece outer cover, giving an aesthetically pleasing medern low profile shape.
Twin fire alarm LEDs give 360 viewing; the light from the from the LEDs is transmitted via unique light guildes because the LEDs are sealed on the PCD for increased protection and realiability.
A common mounting base allows sensor interchange and maintains loop continuity
when sensors are removed. The common base is electronic free and is a simple rugged design with screw terminals for cable connection.
A simple anti-temper locking mechanism is provided which is enabled by removing a small plastic plug on the back of the sensor. Once locked the head can only be removed using a special head removed tool.
Enhanced System Protocol (ESP)
ESP is the digital loop protocol used to communicate between the fire alarm control panel and the installed ASX Range Sensors as well as the associated field I/O devices.
It was developed to be a common communication platform for future Integrated system and has therefore many unique features including a very high level of data security. ESP overcomes the traditional problems with analogue addressable communications in electrically noisy enviornments by utilising check sum error checking. This makes ESP immune to noise and other communication problems such as loop crosstalk, thereby eliminating flase alarms due to data corruption. ESP is supported by a number of quality fire alarm control panel manufactures that provide highly functional and reliable equipment.
Recessed Base Adaptor
All three smoke sensors have a built in test facility which allows the fire alarm controlpanel to adjust the alarm threshold levels to compensate for contamination. A maintenance alarm is displayed when the threshold can no longer be adjusted.
Working with the control panel
The sensor also has the ability to monitor both of the sensing elements irrespective of the selected mode for a potential fire condition, which if detected, is then transmitted to the fire alarm panel control, allowing the control panel to decide on the required action.
