– Product Datasheet – 

The Rosemount 975MR multi-spectrum infrared flame detector is based on accurately analyzing the multi-spectral signals by utilizing three separate IR sensors. The 975MR detects fuel and gas fires at long distances. For example, this product will detect a 1 ft2 (0.1m2) gasoline pan fire at 215 ft (65 m) in less than 5 seconds. The 975MR also provides the highest immunity to false alarms and enhanced overall coverage range.

Response time Typically 5 seconds
Adjustable time delay Up to 30 seconds
Sensitivity ranges 4 sensitivity ranges for 1 ft.2 (0.1 m2) n-heptane pan fire from 50 ft. (15 m) to 215 ft. (65 m)
Field of view Horizontal: 100°, vertical: 95°
Built-in-test (BIT) Automatic and manual
Temperature range Operating -67 to +167 °F (-55 to +75 °C) Option: -67 to +185 °F (-55 to +85 °C) Storage: -67 to +185 °F (-55 to +85 °C)
Humidity Up to 95% non-condensing (withstands up to 100% relative humidity for short periods)
Operating voltage 24 Vdc nominal (18 – 32 Vdc)
Power consumption Standby: Maximum 90 mA (110 mA with heated window) Alarm: Maximum 130 mA (160 mA with heated window)
Cable entries 2 x ¾-in. – 14 NPT conduits or 2 x M25 x 1.5 mm ISO
Wiring 12-22 AWG: 0.3 mm2 to 2.5 mm2
Electrical input protection According to MIL-STD-1275B
Electromagnetic compatibility EMI/RFI protected to EN 61326-3 and EN 61000-6-3
Electrical interface The detector includes 12 terminals with 5 wiring options (factory set)
Approvals/classifications ATEX and IECEx
Ex II 2 G D
Ex de e IIC T5 Gb Ex d e IIC T4 Gb
Ex tb IIIC T96 °C Db Ex tb IIIC T106 °C Db
(-55 °C ≤ Ta ≤+75 °C) (-55 °C ≤ Ta ≤+85 °C) FM/FMC/CSA
Class I Div.1, Groups B, C & D
Class II/III Div.1, Groups E, F & G
Ambient Temperature Operating: -67 °F to +167 °F (-55 °C to +75 °C)
Option: -67 °F to +185 °F (-55 °C to +85 °C)
Storage: -67 °F to +185 °F (-55 °C to +85 °C)
Enclosure Rating Stainless Steel 316L with electro polish finish
Heavy duty copper free aluminum (less than 1 %), red epoxy namel finish (not available in FM version)
Mounting Stainless Steel 316L with electro polish finish
Rosemount™ 975MR Multi-spectrum Infrared Flame Detector

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