Discovery Marine Heat Detector

Product code: 58000-400MAR

58000-400MAR - Discovery Marine Heat Detector
The Discovery Marine Heat Detector, distinguishable by the low airflow resistant case, uses a single thermistor to sense the air temperature around the detector.
Full Details

Application Environments

Dusty environments

Large vessels



Brand Information

Discovery Marine analogue addressable fire detectors are suitable for larger vessels. The high specification range has been developed to meet the requirements of sophisticated systems. Discovery gives you total reassurance in installations where it is necessary to adapt detection to different operating environments and where protection against unwanted alarms is paramount.

Brand Features

Approved for use in the marine environment Five response modes for environmental adaptation Day/night switching for increased flexibility Drift compensation for false alarm reduction User programmability for data XPERT card addressing for increased security


The Discovery Marine Heat Detector uses a single thermistor to sense the air temperature at the detector position. The thermistor is connected in a resistor network, which produces a voltage output dependent on temperature. The design of the resistor network, together with the processing algorithm in the microcontroller, gives an approximately linear characteristic from 10°C to 80°C. This linearised signal is further processed, depending on the response mode selected, and converted to an analogue output.

Device Addressing

For the European standard version of the detector, the five modes correspond to five classes” as defined in EN54–5:2001. The classes in this standard correspond with different response behaviour, each of which is designed to be suitable for a range of application temperatures. All modes incorporate “fixed temperature” response, which is defined in the standard by the “static response temperature”. For more details refer to datasheet PP2479.



Maintenance & Service

Detectors should be maintained according to BS 5839-1 or other locally applicable code. Test equipment can be ordered from Apollo for testing smoke and heat detectors. Detectors should not be cleaned in the field except for careful removal of exterior dirt with a damp cloth. For cleaning and recalibration detectors should be returned to Apollo Fire Detectors or to the local distributor.

EMC Directive 2014/30/EU

The product complies with the essential requirements of the EMC Directive 2014/30/EU, provided that it is used as described.

Construction products regulation 305/2011

The product complies with the essential requirements of the Construction Products Regulation 305/2011.


In addition to the basic classification, a detector may be given an “R” or “S” suffix. The “R” suffix indicates that the detector has been shown to have a rate-of-rise characteristic. Such a detector will still give a rapid response even when starting from an ambient temperature well below its typical application temperature. This type of detector is therefore suitable for areas such as unheated warehouses in which the ambient temperature may be very low for long periods. The “S” suffix on the other hand indicates that the detector will not respond below its minimum static response temperature even when exposed to high rates of rise of air temperature. This type is therefore suitable for areas such as kitchens and boiler rooms where large, rapid temperature changes are considered normal.

Product Information

The Discovery Marine Heat Detector, distinguishable by the low airflow resistant case, uses a single thermistor to sense the air temperature around the detector.

Key Features

Ideal in environments that are dirty or smoky Unaffected by wind or atmospheric pressure Remote test feature

  • Dusty environments
  • Large vessels
  • Marine
  • Restaurants
Fire TypeFast burning, flaming fires
Warranty10 year
Alarm level analogue value55
Chamber typeChevron
Heat classification
  • A1R
  • A2R
  • A2S
  • CR
  • CS
Protocol voltage (min)5V
Protocol voltage (max)9V
Protocol voltage5 to 9V peak to peak
Power-up surge current 1mA
Maximum power-up time10 seconds
Quiescent current400μA
Quiescent current tested at24V dc
PolarityL1 & L2 are polarity insensitive
Humidity (min)0% RH
Humidity (max)95% RH
Humidity Noteno condensation or icing
Humidity0% to 95% (no condensation or icing)
Operating temperature (min)-40°C
IP rating ValueIP54
Storage temperature (min)-40°C
Storage temperature (max)80°C
Storage temperature-40 to 80°C
StandardsEN 54-5
  • BV
  • KRS
  • DNV.GL
  • CCS
  • ABS
  • LR
  • ESC
  • MED
Materials housingPolycarbonate
Materials terminalsNickel plated stainless steel
Product length42mm
Product diameter100mm
Detection principleTemperature sensitive resistance.
Sensor configurationExposed heat sensing thermistor.
How to Order

Apollo is dedicated to ensuring that our customer service is aligned with your expectations. This includes making our order, service and delivery process a seamless and hassle-free experience.

Full details of our service standards can be downloaded here.

Existing customers

Please email your order to us at: or tel: 023 9245 6530.

New customers

Please email your order to us at: or tel: 023 9244 2700.


Despite our best efforts, mistakes sometimes happen. Please contact us at: if you have any difficulties placing your order.

Please note…

Remember to quote your account number and purchase order number on any order correspondence.

All orders must be over £50.00 (excluding carriage). Any orders received under the minimum order value will be returned to sender for revision.