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Apollo Series 65 CS 90°C Heat Detector -

Apollo Series 65 CS 90°C Heat Detector - 55000-137APO

Product Code: 55000-137APO

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Apollo Series 65 CS 90°C Heat Detector - 55000-137APO Key Features

  • Activates upon reaching a fixed temperature of 90°C only
  • Can be used for applications where smoke detectors are unsuitable
  • Ideal for environments that are dirty or smoky under natural conditions
  • Wide-operating voltage of 9–33 V DC
  • Wide-operating and storage temperature of -20°C to +60°C
  • Can be used on security systems
  • Electrically and mechanically compatible with Series 60
  • Proven detection performance
  • Mounting Bases are sold separately (click here to see compatible bases)

Product Information

The Series 65 Heat Detector monitors temperature by using a dual thermistor network which provides a voltage output proportional to the external air temperature. There are 12 heat detectors in the Series 65 range designed to suit a wide variety of operating conditions.


This detector has a moulded self-extinguishing white polycarbonate case.

Nickel plated stainless steel wiper contacts connect the detector to the base. Inside the case a printed circuit board holds the signal processing electronics.

A pair of matched negative temperature co-efficient thermistors are mounted on the PCB in such a way that one thermistor is exposed to give good thermal contact with the surrounding air while the other thermistor is thermally insulated.

Under stable conditions both thermistors are in thermal equilibrium and have the same value of resistance. If air temperature increases rapidly the resistance of the exposed thermistor becomes less than that of the insulated thermistor. The ratio of the resistance of the thermistors is monitored electronically and an alarm is initiated if the ratio exceeds a factory preset level. This feature determines the 'rate of rise' response of the detector

If air temperature increases slowly, no significant resistance difference develops between the thermistors, but at high temperatures a fixed value resistance connected in series with the insulated thermistor becomes significant.

When the sum of the resistance of the insulated thermistor and the fixed resistor compared to the resistance of the exposed thermistor reaches a preset value, an alarm is initiated. The value of the fixed resistor is selected to set the detector into alarm state at a specified fixed temperature.

The detector signals an alarm state by switching an alarm latch on, increasing the current drawn from the supply from about 50μA to a maximum of about 75mA. This fall in the impedance of the detector is recognised by the control panel as an alarm signal

The alarm current also illuminates the detector integral LED. A remote indicator connected between the L1 IN terminal and the -R terminal will have a voltage less 1 volt across it and so will illuminate.

To ensure correct operation of the detector the control panel must be arranged to supply a maximum of 33 volts DC and a minimum of 9 volts DC in normal operation. The supply may fall to 6 volts DC in alarm conditions if a supply current of at least 10mA is available at this voltage. To ensure effective illumination of the integral LED and any remote indicator, the supply to the detector should exceed 12 volts.

To restore the detector to quiescent condition, it is necessary to restore a normal temperature level and interrupt the electrical supply to the detector for a minimum of one second.

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

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Technical Details

Specifications are given at 23°C and 50% relative humidity unless stated otherwise.

Product Code: 55000-137APO
Max Application Temperature °C: 80°C
Max Static Response Temperature °C: 100°C
Supply Wiring: 2 wire monitored supply, polarity insensitive
Supply Voltage: 9 to 33V DC
Ripple Voltage: 2V peak to peak maximum at 0.1Hz to 100kHz
Quiescent Current: 40μA at 9V - 45μA at 24V
Switch-on Surge Current: 40μA at 9V - 45μA at 24V
Alarm Voltage: 6 to 28V
Alarm Indicator: Red LED
Design Alarm Load: 420Ω in series with a 2V drop
Holding Voltage: 6V
Holding Current: 10mA
Minimum Voltage Required to Illuminate Indicator 12V
Alarm Reset Voltage: ?
Remote Output Characteristics: Remote is a current sink to the negative line limited to 17mA
Storage Temperature Range: -30°C to 120°C
Operating Temperature: -20°C to 90°C (no icing)
Humidity: 0% to 95% relative humidity (no condensation)
Atmospheric Pressure: Unaffected
IP Rating: 23D in accordance with BS EN 60529
Dimensions: 100 x 42 mm (100 x 50 mm in base)
Weight: 80g (131g in base)
Materials: White polycarbonate detector housing rated V-0 in accordance with UL 94, nickel-plated stainless steel terminals

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