Fireye InSight II Marine Flame Scanner

Mechanical specifications and explosion-proof structure

3.1 Shell and Protection

Material: 316 stainless steel, the primer is zinc foundation make-up paint, the intermediate coat is gray epoxy resin, and the finish is polyurethane. This three-layer coating system can resist salt spray corrosion in the ocean atmosphere.

Weight: 21.3 pounds (approximately 9.66kg), stainless steel model.

Protection level: IP66 (completely dustproof, resistant to strong water spray).

Explosion proof certification:

ATEX Ex db IIC T6/T5/T4 (Explosion proof enclosure, suitable for Class II explosive gas environment, temperature group T6~T4)

Ex tb IIIC T85/T100/T135 ° C (dust explosion-proof)

Suitable cable connectors and accessories are required to maintain certification.

3.2 Installing flanges

The scanner needs to be fixed to the observation tube through a separate threaded flange. The flange is made of 316 stainless steel material (excluding insulated threaded inserts) and also adopts a three-layer coating. Provide two thread options:

60-2693-2:1 inch BSP female thread with 3/8-inch BSP female cooling air interface.

60-2693-3: 1 inch NPT female thread with 3/8 inch NPT female cooling air interface.

The flange weighs approximately 1.86 pounds (0.84kg) and needs to be ordered separately. When installing, first screw the flange onto the observation tube, and then screw the scanner into the flange. Cooling air is connected through a 3/8-inch interface for blowing observation windows and cooling scanners.

Cooling and blowing air requirements

The furnace temperature of marine boilers can reach hundreds or even thousands of degrees Celsius, and there may be positive pressure present. The scanner must be ventilated with cooling/blowing air to function properly.

Minimum flow rate: 4 SCFM (approximately 113 liters/minute) enters the observation tube through a 3/8-inch interface or a 1-inch Y-shaped connector. If the ambient temperature is close to the upper limit of the scanner's operating temperature (+65 ° C), or if dirty fuel (such as heavy oil) is used, it may be necessary to increase it to 15 SCFM (425 liters/minute).

Air source quality: clean, dry, and cooled air (instrument air or dedicated fan). Damp or oily gases can contaminate observation windows and corrode internal optical components.

Pressure: It must be sufficient to overcome the positive pressure in the furnace. Usually, it is required that the cooling air pressure be at least 2-5 inches of water column higher than the furnace pressure.

Temperature requirement: The scanner itself allows an ambient temperature of -40 ° F to+150 ° F (-40 ° C to+65 ° C). The inlet temperature of the cooling air should be within this range.

Attention: Never install the scanner on a high-temperature furnace without cooling air, otherwise it will immediately damage the sensor and electronic components.

Electrical specifications and cable selection

5.1 Power Supply

Input voltage: 24 Vdc,+10%/-15% (approximately 20.4~26.4V DC).

Power supply current: 0.35 A (typical), maximum apparent power of 8.5 VA.

Power on setup time: The power output rise time must be ≤ 20 milliseconds to ensure reliable startup of the scanner. Fireye recommends using a dedicated power supply 60-2685.

5.2 Cable Requirements

Due to the fact that the scanner output signal (relay contacts, 4-20mA) and input (24V power supply) are all connected through a multi-core cable, shielded cables must be used to prevent electromagnetic interference.

Fireye offers two specifications of dedicated cables:

Model, number of cores, wire gauge, shielding outer diameter, temperature range, maximum length

59-546 8-core # 18 AWG aluminum foil+braided+drain wire 0.44-0.48 inches -40 ° C~+105 ° C 305 meters

59-547 12 core # 18 AWG as above 0.52~0.56 inches -40 ° C~+105 ° C 305 meters

Cable grade: PLTC-ER (power limited tray cable, exposed operation), flame-retardant PVC sheath, compliant with RoHS.

The drain wire must be grounded at one end (usually on the control cabinet side).

The cable length should not exceed 1000 feet (305 meters), otherwise signal attenuation may affect 4-20mA accuracy.

If the user wires the cables themselves, shielded multi-core cables of the same specifications should be used, and each pair of signals should have independent shielding or overall shielding with interference lines.

Installation and wiring steps

6.1 Mechanical Installation

Confirm the position of the observation tube: The observation tube should point towards the stable area of the flame (usually the root of the flame), avoiding observing the furnace wall or cooling air swirl. The length and inner diameter of the observation tube should be selected according to the flame brightness to ensure that the scanner has sufficient field of view.

Welding or fixing installation flange: Weld the 60-2693-x flange to the end of the observation tube (or connect it through threads), ensuring that the flange surface is perpendicular to the axis of the observation tube.

Introduce cooling air: Connect the 3/8-inch pipeline to the cooling interface of the flange, install a manual ball valve and pressure gauge to adjust the flow rate.

Install scanner: Screw the scanner into the flange and manually tighten until the sealing gasket contacts. Do not use a wrench to apply excessive force.