ABB 8232 Instruction Manual

ABB 8232 Instruction Manual Manual pdf 4 page image

2Ammonia 8232CalibrationSolutionContainersConstant Head Unit(behind case)with Sample Inlet andDrain ConnectionsPeristalticPumpCase LockTemperatureControlledBlock(cover removed)Ammonia ProbeCable Entry GlandsCase LockMicroprocessorUnitHinged CaseSolenoid Valves(behind case)User Junction Box(behind case)Hinged DoorPush-to-ReleaseLatch1 INTRODUCTIONFig. 1.1 Location of Instrument Components1.1 DescriptionThe Model 8232 Ammonia Monitor is a microprocessor basedanalyser using an ABB ammonia ion-selective probe. Thisequipment is used for environmental water monitoring.1.2 TrainingDue to the specialised nature of the above instrument, it isrecommended that, where the end users personnel have hadno previous experience of maintaining this equipment, trainingbe provided by this Company.Such training is available via the local Company in the UK, orOverseas Agent elsewhere and may be carried out either onthe users premises or at the factory.1.3 Location and Function of Main Components –Fig. 1.1Monitoring of any sample by ion-selective electrodes usuallyrequires certain conditioning to be performed on the sample toallow accurate, trouble-free measurement. Such conditioninginvolves regulating flow, controlling temperature and adjustingchemical composition prior to presentation of the sample tothe point of measurement. This monitor carries out theseadjustments for each parameter in simple and easilyunderstood steps. The sample is presented from the user'spipework to a constant head unit and any excess is allowed tooverflow. This allows sample, under controlled pressureconditions, to be presented to a multi-channel peristaltic pumpwhich proportions sample and reagent solutions through themonitor to the mixing point. The resulting combined solution isthen temperature controlled to remove the effects of sampleand ambient temperature variations. The conditioned solutionis then delivered to the probe, under constantly flowingconditions, where the ion measurement takes place.The probe generates a millivolt output which is proportional tothe ion concentration. This output is processed by themicroprocessor-based electronics section to calculate theactual sample concentration.To maintain optimum measurement accuracy it is necessary tointroduce standard solutions of known concentration forcalibration purposes. The monitor utilises solenoid valves tointroduce these standard solutions automatically, atpredetermined intervals, under the control of themicroprocessor.The electronics section consists of the main MicroprocessorUnit situated at the top left and a User Junction Box at the topright behind the hinged case.