Rosemount™ 975MR Multi-spectrum Infrared Flame Detector

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