Infra-View®
Infrared Boiler/Furnace Thermometer
1. INTRODUCTION
The Infra-View Boiler/Furnace Thermometer is a remote infrared temperature sensor designed to passively monitor the amount of thermal energy emitted from CO2 gas in a boiler or furnace. The Infra-View Boiler/Furnace Thermometer operates continuously during startup and normal operation providing a temperature reading with an accuracy of ± 1% of the actual temperature sensed.
The Infra-View Boiler/Furnace Thermometer operates as an integrated temperature measurement subsystem consisting of optical elements, infrared spectral filters, digital electronics and a NEMA 4 housing. They are built to operate on a 100 percent duty cycle in industrial environments at 24 VDC. Output consists of a 4 – 20 mA signal commonly available for use with controllers, recorders, alarms, or DCS interfaces.
2. GENERAL CONSIDERATIONS
All instruments are carefully packed to protect them from damage in shipment. Upon receipt, the package should be visually inspected for any signs of damage in transit. Any noticeable damage should be immediately reported to the carrier.
Verify that the model number is correct and that all accessories ordered are included in the shipment.
3. INSTALLATION
The Infra-View Infrared Boiler/Furnace Thermometer is shipped completely assembled with a combination instrument and protective cooling jacket. The protective jacket is equipped with a 2” X 1-1/2”, 150 lb. reducing flange. See Figure 3. Standard installation is for customer to install a 2” schedule 40 nipple between six (6) and eighteen (18) inches in length welded or screwed to a 2”, 150 lb. mating flange. If a nipple longer than eighteen (18) inches is desired, consult with JNT prior to installation. The nipple with the 2” 150 lb. flange should be welded onto the boiler observation door, sootblower port or other suitable location prior to installation of the Infra-View protective jacket.
The Infra-View Infrared Boiler/Furnace Thermometer is shipped with a non-asbestos insulating spacer secured to the flange. In the finished installation, the automatic draining air filter must be in a vertical position with the drain valve facing down to operate properly.
4. COOLING/AIR PURGE REQUIREMENTS
All Infra-View Infrared Thermometers are preassembled at the factory with an auto-drain air filter, air cooler and all hose interconnections required to make this instrument as reliable and maintenance free as possible. The auto-drain air filter is used as the final method of cleaning and drying the compressed air immediately prior to entering the cooling jacket. This air filter will not remove oil in the compressed air.
Plant air of at least 15 CFM (.42 M3/min) and 70-90 PSI (10-13KPa) must be connected to the ¼” NPT female inlet on the air filter or if the Infra-View Valve was also ordered, connected to the ¼” NPT female inlet on the valve actuator. This unit provides sufficient purge air for most requirements, however, if ash build-up becomes a problem, additional purge air may be introduced by removing the ½” plug in the wye and connecting a separate source of compressed air to this fitting.
coalescing filter (available from JNT Technical Services) rated for a minimum of 15-CFM (.42M3/min) be installed within ten feet of the cooling jacket. Coalescing filters tend to lose rated capacity over time. An oversized filter (25 to 30 CFM) should be considered. Each Infra-View cooling jacket should have a dedicated coalescing filter.
Coolant piping should be designed to be of sufficient size to ensure that the bulk of the pressure drop occurs in the flow control elements of the cooling circuit. All Infra-
