Conventional Detectors
Series 60 Ionisation Smoke Detector 
The sensing part of the detector consist of two chambers - an open, outer chamber and a semi-sealed reference chamber within. Mounted in the reference chamber is a low activity radioactive foil of Americium 241 which enables current to flow between the inner and outer chambers hen the detector is powered up.
As smoke enters the detector, it causes a reduction of the current flow in the outer chamber and hance an increase in the voltage measured at the junction between the two chambers. The voltage increase is monitored by the electronic circuitary which triggers the detector into the alarm state at a present threshold. An externally visible LED will light up when the detector changes to alarm state.
55000-200
55000-210
More Information: An integrating ionisation detector, suitable for use in areas where transient high levels of smoke may be expected, is also available.
| PROPERTY | VALUE |
| Detector Part No. | 55000-200/210 |
| Base Part No. | 45681-200 |
| Size of Detector, Height x Diameter (mm) | 42 x 100 |
| Supply Voltage | 17-28VDC |
| Maximum Quiescend Current at 24V | 45uA |
| Alarm Current at 24V | 52mA |
| Alarm Indication | Red LED |
| Normal Operating Temperature (no icing) | -20 to +60°C |
| Humidity (no condensation) | 0-95% |
| Max wind (continuous) | 10m/s |
| Remote Output Characteristics | 900 Omega in series with a 3V drop (suitable for connecting one LED |
| Size of Detector in Base, Height x Diameter (mm) | 50 x 100 |
*As out policy is one of constant product improvement the right is therefore reserved to modify product specifications without prior notice.
Series 60 Optical Smoke Detector
Optical smoke detector incorporate a pulsing LED located in a labyrinth within the housing of the detector. The labyrinth is designed to exclude light from any external source. At an angle to the LED is a photo-diode which normally does not register the column of light emitted by the LED.
In the event of smoke from a fire entering the labyrinth the light pulse from the LED will be scattered and hence registered by the photo-diode. If the photo-diode "sees" smoke on the two following pulses, the dector changes to the alarm state when the indicator LED will light up. The detector housing is identical to that of the ionisation smoke detector. It is distinguished from this type by having an indicator LED which is clear in quiescent state but produces red light in alarm. The optical detectors are easy to disassemble and clean without the necessity of returning them to the factory.
55000-300
55000-380
More Information: A combination optical and 57 C heat detector is now available. Please contact us for more information.
| PROPERTY | VALUE |
| Detector Part No. | 55000-300 |
| Base Part No. | 45681-200 |
| Size of Detector, Height x Diameter (mm) | 42 x 100 |
| Size of Detector in Base, Height x Diameter (mm) | 50 x 100 |
| Supply Voltage | 17-28DC |
| Maximum Quiescend Current at 24V | 45uA |
| Alarm Current at 24V | 53mA |
| Alarm Indication | Clear LED red in Alarm |
| Normal Operating Temperature (no icing) | -20 to +60°C |
| Humidity (no condensation) | 0-95% |
| Remote Output Characteristics | 900 Omega in series with a 3V drop (suitable for connecting one LED |
*As out policy is one of constant product improvement the right is therefore reserved to modify product specifications without prior notice.
Series 60 Ionisation Heat Detector
The Series 60 heat detector are resettable and operate by using a matched pair of thermistors to sense heat. One thermistor is exposed to the ambient temperture, the other is sealed. In normal conditions the two thermistors register similar temperatures, but, on the development of a fire, the, temperature recorded by the exposed thermistor will increase rapidly, resulting in an imbalance of the thermistors and causing the detector to chanmge to the alarm state.
Rate of rise detectors are designed to detect a fire as the temperature increase, but they also have a fixed upper limit at which the detector will go into alarm if the rate temperature increase has been too slow to trigger the detector eariler.
Fixed Heat detector only changes to the alarm state at a present temperature.
Externally, the heat detectors are distinguishable from smoke detectors by having wide openings to the surrounding atmosphere to allow good movement of air around the external thermistor.
55000-100 Grade 1
55000-101 Grade 2
55000-102 Grade 3
55000-103 Range 1
55000-104 Range 2
| PROPERTY | VALUE |
| Detector Part No. | Grade 1 = 55000-100, Grade 2 = 55000-101, Grade 3 = 55000-102, Range 1 at = 55000-103, Range 2 = 55000-104 |
| Base Part No. | 45681-200 |
| Size of Detector, Height x Diameter (mm) | 42 x 100 |
| Size of Detector in Base, Height x Diameter (mm) | 50 x 100 |
| Supply Voltage | 17-28VDC |
| Maximum Quiescend Current at 24V | 53uA |
| Alarm Current at 24V | 52mA |
| Alarm Indication | Red LED |
| Normal Operating Temperature (no icing) | -20 TO +105°C |
| Humidity (no condensation) | 0-95% |
| Remote Output Characteristics | 900 Omega in series with a 3V drop (suitable for connecting one LED |
*As out policy is one of constant product improvement the right is therefore reserved to modify product specifications without prior notice.
Series 60 Base
The base has been designed to enable detectors to be plugged in without any need for force - particularly useful when fitting to suspended ceilings. To make it even easier the base has a "one way only" fit. All series 60 bases are lockable.
The detector are polarity insensitive and bases are easy to wire an earth connector.
45681-201
More Information: For conventional systems that are designed to operate correctly when one or more detector heads have been removed, a base fitted with a diode in Line 1 (positive line) is available.
