Product Overview | 8200 Controller
In industrial processes, a precise mix of fuel and air for combus- tion is required for maximum efficiency, low emissions, and low operating costs. The North American 8200 Combustion Process Controller is designed to effectively regulate these variables in industrial furnaces, kilns, dryers, boilers, etc. OVERVIEW INTRODUCTION The 8200 provides process and ratio control of industrial com- bustion applications in a single easy-to-use unit. Here is how it accomplishes the key benefits. — Maximum efficiency comes from optimum ratio setting, reduced excess air, and the use of flue gas oxygen measurement as a ratio trim to adjust for fuel or other process variations. — Tight flow control in proper ratio contributes to reduced emissions to meet the strictest of environmental regulations. — Proper operation is maintained by fault detection and predefined actions. If the unit discovers a fault, the control loops will drive to predefined states. Discrete inputs can change the operating state to reflect process conditions. Discrete outputs are available to act as process permissives. — Low operating costs are achieved through the above performance, within one attractively priced instrument. Its built-in diagnostics effect quick return to service and its touchscreen display simplifies its use. Control Your Combustion Process Parameters in a Single Controller. — Process control loop with milliamp, thermocouple input, or external demand input. — Two air control loops for separate or simultaneous use with two oxidants — Touch screen display in engineering units with text diagnostics
4. Air 2 can be Flue Gas Recirculation (FGR) 5. Up to 2 air and 2 fuel control loops 6. Furnace pressure PI control available. 7. Oxygen trim on the ratio.
Digital event outputs from the unit can notify the operator of thresholds in operating conditions or trigger changes in the process, such as opening a second fuel valve when the process reaches a certain temperature. Discrete inputs read by the controller change its operating state to match furnace conditions (purge, low fire, or hold, etc.). The unit and inputs associated with the process are alarmed. An alarm triggers a display of abnormal condition and defaults the unit to an operating mode to assure process safety: hold, shut down, etc. PROCESS CONTROL The North American 8200 main process control loop accepts a 4-20 mA or thermocouple input signal and executes a PI control loop. The unit can be configured for J, K, N, R, and S type thermo- couples operating as a temperature control displayed in degrees F or C. It can alternately read a 4-20mA signal acting as a pres- sure control (displayed in psig or kPa) or a temperature control (displayed in F or C). The 4-20 mA input can also be treated as a generic signal with any range up to 0-99999. If the application only calls for ratio control of flows, the input signal can be set up as a milliamp demand input. In this case, the demand signal acts as setpoint for the firing rate. AIR, OXYGEN and FGR Air or oxygen can be used as oxidant. The 8200 receives up to two oxidant flow inputs, each with an available thermocouple in- put for temperature compensation. Proper application can enable the user to have 1 or 2 air flows, 1 or 2 oxygen flows or one of each. One of the inputs can also be configured for FGR flow. The 8200 can use one drive output to control all oxidant flows or two air drive outputs, one for each. Discrete inputs are used to select which air input(s) are actively used in ratio calculations, allowing them to switch on or off at any time.
The functions include:
1. Control of a temperature, pressure or other process variable with proportional-integral (PI) control software. 2. Oxygen or air as the oxidant 3. Two fuel flows and two air/O 2 fl ows.
Bulletin 8200 Page 2
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