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Stability assessment
Tolerance to cold air turbulence*****
Tolerance to hot air turbulence*****
Tolerance to quartz halogen lamp *****
Tolerance to fluorescent tube*****
Tolerance to insect test *****
Key: Detector operated correctly throughout test *****
Product assessment
Design and design features****
Circuitry and components****
Ease of installation and wiring ****
Range & variety of functions***
Accompanying instructions****
Technical advice and backup***
Value for money***
Key: Outstanding ***** Very good **** Above average *** Average ** Below average *
Facts panel
EquipmentDS939
Product groupIntrusion detector
ApplicationRetail & department stores, banks & financial institutions, factories etc
ManufacturerBosch Security Systems
Address207 Bedford Avenue, Slough, Berkshire SL1 4RY
Telephone01753 611900
Fax01753 611166
Trade price (ex VAT)£57.50
CE Mark awardedYes
Lens typeFresnel
Interchangeable lensesNo
Range of centre axis21m
No of detection zones69 zones in 21 barriers
Coverage adjustmentVertical adjustment for customised coverage
Dual/quad element sensorThree sensors
Temperature compensationYes
Alarm period4 seconds
Pulse countNo
Other signal processing optionsLow/high gain settings
Walk test facilityYes
Housing materialABS
Anti-masking facilityNo
Self-testing functionsNo
Power supply voltage9 to 15v DC
Max current consumption39mA
DimensionsHeight 3.5 inches, depth 7 inches
Warranty5 years