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Apollo Orbis A1R Heat Detector - ORB-HT-11001-APO

Product Code: ORB-HT-11001-APO

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Apollo Orbis A1R Heat Detector - ORB-HT-11001-APO Key Features

  • Activates upon detecting a rapid temperature increase (Rate-of-rise) or once a temperature of 57°C has been reached
  • Can be used for applications where smoke detectors are unsuitable
  • Ideal in environments that are dirty or smoky under normal conditions
  • Red flashing LED at StartUp confirms the device is operating.
  • SensAlert®, yellow flashing LED indicates faulty operation
  • FasTest® takes just four seconds to test and confirm detectors are functioning correctly
  • Mounting Bases are sold separately (click here to see compatible bases)

Product Information

The Orbis Heat Detector monitors temperature by using a single thermistor which provides a voltage output proportional to the external air temperature.


Orbis heat detectors have an open-web casing which allows air to flow freely across a thermistor which measures the air temperature every 2 seconds. A microprocessor stores the temperatures and compares them with pre-set values to determine whether a fixed upper limit–the alarm level–has been reached.

In the case of rate-of-rise detectors the microprocessor uses algorithms to determine how fast the temperature is increasing. Static heat detectors respond only when a fixed temperature has been reached.

Rate-of-rise detectors also have a fixed upper limit but they also measure the rate of increase in temperature. A fire might thus be detected at an earlier stage than with a static detector so that a rate-of-rise detector is to be preferred to a static heat detector unless sharp increases of heat are part of the normal environment in the area protected by the heat detector.


Orbis detectors have drift compensation to compensate for changes caused by the environment. The most usual change is contamination.

If the detector is dirty to the point where it can no longer compensate, its LED will flash yellow while it is in StartUp.


When Orbis detectors are powered up they automatically enter a phase known as StartUp and in which they stay for 4 minutes. After this they revert to normal operation. If the detector is reset, ie, if power is disconnected for one second or longer, the detector will always enter StartUp for the first four minutes after power has been restored. The detector LED flashes red once a second to indicate that it is in StartUp.

What StartUp indicates:

StartUp is used to check that the positive and negative cables are connected in the correct polarity and that power has been applied to the detector. If this is the case, the LED will flash red once a second.

StartUp will not check whether the IN+ and OUT+ connections have been transposed. This is not a problem if standard bases are used as the detector will operate normally.

If, however, diode bases are used and a detector is removed from a base with transposed positive connections none of the detectors beyond this point will operate.


Orbis detectors incorporate a test facility known as FasTest®, a facility which is automatically available during StartUp and which modifies algorithms so that testing is possible within 4 seconds.

Environmental Characteristics

The environmental performance is similar to that of the Orbis optical smoke detector but it should be noted that heat detectors are designed to work at particular ambient temperatures.

Mounting Bases are sold separately (click here to see compatible bases)

Technical Details

Manufacturer: Apollo
Product Code: ORB-HT-11001-APO
Principle of Detection: Measurement of heat by means of a thermistor.
Sampling Frequency: Once every 4 seconds
Supply Voltage: 8.5 - 33V DC
Supply Wiring: 2 wires, polarity sensitive
Maximum Polarity Reversal: 200ms
Power-up Time <20 Seconds
Switch on Surge Current at 24V 95μA
Average Quiescent Current at 24V 95μA
Alarm Current: 12 Volts: 20mA - 24 Volts: 40mA
Alarm Load: 600Ω
Alarm Reset Time: 1 Second
Material: Detector and base moulded in white polycarbonate
Alarm Indicator: Integral indicator with 360° visibility
Dimensions: 97mm (Diameter) x 36mm (Height) - 100mm D x 51mm H (IN BASE)
Weight: Detector: 70g - Detector in Base: 130g
Temperature: Operating & Storage Temp. -40°C to +70°C
Humidity: 0% to 98% relative humidity (no condensation)
Wind Speed: Unaffected by wind
Atmospheric Pressure: Insensitive to pressure
IP Rating to EN 60529:1992: 23D

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