51Safety StockFor critical applications where performance with minimum downtime is required, Barnstead|Thermolyne rec-ommends that you maintain a local stock of those parts listed in the General Maintenance Parts and SafetyStock sections.Description Catalog No. Recommended QuantityDisplay SW1190X2 1External Display cable (Remote Display Use) WHX20 1Main PC Board PC1190X1 1Recirculation Pump & Motor PU1190X1 1Pressure Regulator 1Resistivity Cell E896X4 1Solid State Ballast UV SC1191X1 1Quartz Sleeve, UV Lamp TU733X1 1Power Supply PC Board TNX116 1Calibration PC Board PCX48 1Resistivity Meter PC Board PC896X2 1Check Valve PMX214 1Wire Harness, UV Bulb WH1191X1 1Flow Sensor ME1190X1Flush Solenoid RY1190X3 1Unit ManifoldDispenser ManifoldDispense Switch SW1190X1 1Optional Accessory Ordering InformationDescription Catalog No.N.I.S.T. Calibration Module E896X5Low-Pressure Switch D2706Float Switch D8964Remote Dispenser D11981Serial Cable for Communication with Computer WHX18Printer (120-240 VAC system) AY1137X1Printer Replacement Paper Roll AY669X4REPLACEMENT PARTS