model 2704 controller installation and operation handbook - Soliton

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Controller Applications 2704 Controller 10. Chapter 10 Controller Applications The 2704 controller contains control blocks specifically designed to suit a number of different applications. Examples are:- Carbon Potential, Oxygen or Dew Point control using Zirconia probes Humidity control using wet and dry platinum resistance thermometers About this chapter This chapter gives general descriptions (which are not intended to be of a particular installation) of the use of the 2704 controller in the above applications. ◊ ◊ ◊ ◊ ◊ ◊ Brief description and terminology applications using zirconia probes An example wiring diagram for carbon potential control Viewing and adjusting the parameters for a carbon potential controller Brief description of humidity control An example wiring diagram for humidity control Viewing and adjusting the parameters for a humidity controller 10-2 Installation and Operation Handbook. Part No HA026502 Issue 1.0 Apr-00
2704 Controller Controller Applications 10.1. ZIRCONIA - CARBON POTENTIAL CONTROL A dual loop 2704 controller is required to control temperature of the process on one loop and carbon potential on the other. The controller is often a programmer which generates temperature and carbon potential profiles synchronised to a common timebase. In this section it is assumed that a programmer is used. 10.1.1. Temperature Control The sensor input of the temperature loop may come from the zirconia probe but it is common for a separate thermocouple to be used. The controller provides a heating output which may be connected to gas burners or thyristors to control electrical heating elements. In some applications a cooling output may also be connected to a circulation fan or exhaust damper. 10.1.2. Carbon Potential Control The zirconia probe generates a millivolt signal based on the ratio of oxygen concentrations on the reference side of the probe (outside the furnace) to the amount of oxygen in the furnace. The controller uses the temperature and carbon potential signals to calculate the actual percentage of carbon in the furnace. This second loop generally has two outputs. One output is connected to a valve which controls the amount of an enrichment gas is supplied to the furnace. The second output controls the level of dilution air. 10.1.3. Sooting Alarm In addition to other alarms which may be detected by the controller (see also Chapter 7 ‘Alarm Operation’), the 2704 can trigger an alarm when the atmospheric conditions are such that carbon will be deposited as soot on all surfaces inside the furnace. 10.1.4. Automatic Probe Cleaning The 2704 has a probe clean and recovery strategy that can be programmed to occur between batches or manually requested. A short blast of compressed air is used to remove any soot and other particles that may have accumulated on the probe. Once the cleaning has been completed the time taken for the probe to recover is measured. If the recovery time is too long this indicates that the probe is ageing and replacement or refurbishment is due. During the cleaning and recovery cycle, the %C reading is frozen thereby ensuring continuous furnace operation. 10.1.5. Enriching Gas Correction A gas analyser may be used to determine the CO concentration of the enriching gas. If a 4- 20mA output is available from the analyser, it can be fed into the 2704 to automatically adjust the calculated % carbon reading. Alternatively, this value can be entered manually. Installation and Operation Handbook. Part No HA026502 Issue 1.0 Apr-00 10-3
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2704 Controller Contents MODEL 2704
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