Rosemount Analytical 975MR Specifications

Rosemount 975MR Multi-spectrum Infrared Flame Detector

FGD-PDS-975MR

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 three
separate IR sensors. The Rosemount 975MR
detects fuel and gas fires at long distances. For
example, this product will detect a 0.1 m2 (1 ft2)
gasoline pan fire at 65 m (215 ft) in less than five
seconds. The Rosemount 975MR also provides
the highest immunity to false alarms at such
industry leading detection range.

Product Data Sheet

February 2018

Features and benefits

 Multi spectrum design - for long distance detection and

high false alarm immunity
 Sensitivity selection - to ensure no zone crossover detection
 Automatic and manual built-in-test (BIT) - to assure

continued reliable operation
 Heated window - for operation in harsh weather conditions

(snow, ice, condensation)

 Multiple output options for maximum exibility

and compatibility

• Relays (3) for alarm, fault, and auxiliary

• 0–20 mA (stepped)

• HART® protocol for maintenance and asset management

• RS-485, Modbus® compatible

 High Reliability - MTBF - minimum 150,000 hours
 Approved to Safety Integrity Level 2 (SIL 2 – TÜV)
 Five year warranty
 User programmable via HART or RS-485

Rosemount 975MR Multi-spectrum Infrared Flame Detector

Applications

 Oil and gas - Offshore and onshore process facilities
 Reneries
 Petrochemical process facilities
 Crude oil tank terminals
 Automotive manufacturing facilities
 Aircraft hangars
 Power generation facilities
 Chemical and pharmaceutical plants
 Production, loading, and unloading facilities

Rosemount 975MR Multi-spectrum Infrared Flame Detector

February 2018

Specifications

Table 1 - Rosemount 975MR Multi-spectrum Infrared Flame Detector

General specifications

Spectral response Three IR bands

Detection range

(at highest sensitivitysetting
for 0.1m2 (1 ft2) pan re)

Response time Typically 5 s
Adjustable time delay Up to 30 s
Sensitivity ranges 4 sensitivity ranges for 0.1 m2 (1 ft2) n-heptane pan re from 15 m (50 ft) to 65 m (215 ft)

Field of view Horizontal 100˚; Vertical 95˚
Built-in-test (BIT) Automatic (and manual)

Temperature range Operating: -55 ˚C to +75 ˚C (-67 ˚F to +167 ˚F)

Humidity Up to 95 % non-condensing (withstands up to 100 % relative humidity for short periods)
Heated optics To eliminate condensation and icing on the window

Electrical specifications

Operating voltage 24 Vdc nominal (18–32 Vdc)
Power consumption Standby: Max. 90 mA (110 mA with heated window)

Cable entries 2 x ¾ in.- 14 NPT conduits or 2 x M25 x 1.5 mm ISO

Wiring

Electrical input protection

Electromagnetic compatibility

Electrical interface

Outputs

Relays Alarm, fault, and auxiliary

0–20 mA (stepped)

HART® Protocol Optional HART communications on the 0–20 mA analog current (FSK) - used for maintenance, conguration changes

RS-485

Mechanical specifications

Materials

Enclosure options

Mounting Stainless steel 316L with electro polish nish
Dimensions Detector 101.6 x 117 x 157 mm (4 x 4.6 x 6.18 in.)
Weight Detector (stainless steel 316L) 2.8 kg (6.1 lb)

Environmental standards Meets MIL-STD-810C for humidity, salt and fog, vibration, mechanical shock, high temp, low temp
Water and dust IP66 and IP67 per EN 60529, NEMA 250 6P

Fuel m / ft Fuel ft / m Fuel m / ft

n-Heptane
Gasoline
Diesel fuel
JP5

*0.75 m (30 in.) high, 0.25 m (10 in.) width plume re

Option: -55 ˚C to +85 ˚C (-67 ˚F to +185 ˚F)
Storage: -55 ˚C to +85 ˚C (-67 ˚F to +185 ˚F)

Alarm: Max. 130 mA (160 mA with heated window)

12–22 AWG (2.5 mm2–0.3 mm2)
According to MIL-STD-1275B
EMI/RFI protected to EN 61326-3 and EN 61000-6-3

The detector includes twelve (12) terminals with ve (5) wiring options (factory set).

SPST volt-free contacts rated 2 A at 30 Vdc

Sink (source option) conguration

Fault: 0 +1 mA

BIT fault: 2 mA ±10 %

and asset management, available in mA source output wiring options
RS-485 Modbus compatible communication link that can be used in computer controlled installations

- Stainless steel 316L with electro polish nish

- Heavy duty copper free aluminum (less than 1 %), red epoxy enamel nish (not available in FM version)

Detector (aluminum) 1.3 kg (2.8 lb)
Tilt mount 1.0 kg (2.2. lb)

65 / 215
65 / 215
45 / 150
45 / 150

Kerosene
Ethanol
Methanol
IPA (isopropyl alcohol)

Normal: 4 mA ±10 %
Warning: 16 mA ±5 %

45 / 150
40 / 135
35 / 115
40 / 135

Alarm: 20 mA ±5 %

Resistance Loop: 100–600 Ω

Methane*
LPG*
Polypropylene pellets

Ofce paper

45 / 150
45 / 150
35 / 115
25 / 83

2 www.Emerson.com/FlameGasDetection