The Ontario Hydro's Darlington Nuclear Power Generating Station has four nuclear reactors, each requiring its own steam and boiler water analyzing system. The photo shows one of the "dry" panels which houses most of the electronic instruments for Units 1 and 2. An identical panel serves Units 3 and 4. The transmitter - monitors provide analogue read-out for the following analysis: turbidity, specific conductivity, cation conductivity, PH, dissolved oxygen, absolute sodium. differential sodium, chloride and hydrazine. Adjustable alarm set-points on all monitors transmit 4 - 20 m.a. signals to the DAC in the control room in addition to the set of audio and visual alarms at the local panel. Although some users still prefer monitors with analogue read outs, almost all analytical systems built today have digital displays with programmable keyboards. Some analystical instruments also offer automatic calibraion to reduce operator workload. This is one of four secondary sample conditioning panels, which put the finishing touches on the sample streams before allowing the samples to enter the analyzers. The thermostatically controlled common bath is continuously supplied with coolong water in order to reduce and maintain the sample temperature at 25 degrees celsius (77 degrees faranheit). Single or double stage pressure reduction brings the sample pressure to the level acceptable by the analyzer cell. Sample filters help to prevent fouling. On the opposite face of the panel are flowmeters and temperature guages for monitoring stream conditions. To enable the station chemist to check each stream "manually", each stream, through a grab sample valve, terminates in the grab-sample stainless steel sink at the front of the panel. The next photograph shows the intricate tubing network inside the panel. This photograph illustrates the skills and excellent wokmanship which go into every sample conditioning panel. Sample filters (with yellow labels) at top left of photograph are easily accesible for maintenance. Careful pre-planning and layout make every working compnent accessible for regular maintenance or removal. Note one of the PH cells and flow-through type cell holders can be seen at the left front of the photograph. This is one more reason why our highly skilled team of engineers and technicians has been chosen to supply water quality panels to Canada's state-of-the-art nuclear power generating station at Darlington, Ontario, and most recently, a repeat contract to supply similar equipment for Korea's Wolsong Nuclear Power Station Units 2,3 and 4. This photograph shows a typical small steam and boiler water analyzing system destined for the New Brunswick Power Commission's thermal generating station. Analyses include specific and cation conductivity, PH, dissolved oxygen and turbidity which is mounted in another cabinet. Other indicating instruments are pressure and temperature guages, flowmeters and alarm annunciator. All normal operating valves such as sample inlet and blowdown, pressure regulating and grab sample are located at the front of the panel. The stainless steel grab sample sink also incorporates a work bench for the convenience of the station chemist or operator. Cooling water and drain connections can be seen at the lower left hand side of the cabinet The photograph to the right is a sample conditioning panel fabricated for the Wolsong Unit No. 1 Nuclear Power Station in South Korea. For ease of handling the nineteen (19) stream panel was split in the middle and reassembled at the site. Note the various colour coded mimic lines which trace sample flows and help with operating, maintenance and training. The full length stainless steel grab sample sink is accompanied by a full length stainless steel work bench for the convenience of the operator and station chemist. Special Note: Not shown but an almost identical unit was fabricated for the Gentilly No. 2 N.P.S. which is located in Quebec, Canada. The first photograph shows the "Dry" electronic instrument panel for the Wolsong N.P.S. Unit No. 1. The panel houses the indicating transmitters, strip chart recorders and annunciator. The second photograph is a view of the back of the sample panel which is partially visible in the top photo. Sample coolers and sample filters are clearly visible. The neatly routed sample tubings provide easy access to various components for service and maintenance. As a further testimony to a well satisfied customer, Spectrum Systems International is awarded a large contract to design and manufacture three additional analystical systems for Korea's Wolsong Power Station Units 2,3,4.