Lab and field instrumentation 2010 - WTW - #29

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Software/ Printers Colony Counter Turbidity Photometers BOD/ Respiration Data logger/ flow + level Multiparameter Conductivity Dissolved Oxygen (D.O.) ISE ORP pH Parameter For information visit www.WTW.com for a customer care center near you or inside US: call WTW 800 645 5999. 29 VARIO® & pH E l e c t r o d e s 1: Plug head, 2: Fixed cable, 3: AS/DIN, AS/DIN-3 or AS/BNC, 4: Cable length 1 m (3 ft), 5: Cable length 3 m (9 ft), 6: DIN plug, 7: BNC plug, 8: Banana plug SenTi x ® pH e l e c t r o d e s f o r ever y a p p l i c a t i o n SenTix® quality electrodes by WTW – convenient measurement and precision. • Low-resistance glass membranes guarantee stable measuring signals even at low temperatures. • Silver ion-free reference electrolyte, together with the proven platinum wire diaphragm, prevent measurement problems by precipitating silver compounds. • Functional slide for accessing the refill opening for electrodes with liquid electrolyte. • Typical connections: Waterproof DIN connector, BNC connector, fixed cable (1 or 3 m, 3 ft. or 9 ft.) or connector head (S7 or SMEK). IDS pH/ORP electrodes, see page 14 Low-maintenance pH elec t rodes wi th gel elec t rolyt e Ideal for portable measurements, as well as for routine measurements in-the-laboratory. With or without built-in temperature probe all electrodes have robust plastic shafts and a low-maintenance gel reference system. New: The SenTix® F with temperature-stable iodine / iodide system, specifically for measurements at changing temperature conditions. SenTi x ® pH E l e c t r o d e s Model SenTix® 20 103 630 SenTix® 21 103 631 SenTix® 21-3 103 632 SenTix® 22 103 633 SenTix® 41 103 635 SenTix® 41-3 103 636 SenTix® 42 103 637 SenTix® F 103 676 SenTix® F-3 103 677 Measuring range pH 0 ...14 pH 0 ...14 pH 0 … 14 pH Operating range °C (°F) 0 … 80 °C (32 … 176 °F) 0 … 80 °C (32 … 176 °F) 0 … 80 °C (32 … 176 °F) Reference electrolyte Gel Gel Gel Membrane shape Cylindrical Cylindrical Cylindrical Membrane resistance at 25 °C (77 °F) <1 GÙ <1 GÙ <1 GÙ Diaphragm Fiber Fiber Fiber Shaft material Plastic Plastic Plastic Shaft length** 120 mm (4.72 in.) 120 mm (4.72 in.) 120 mm (4.72 in.) Shaft Ø*** 12 mm (0.47 in.) 12 mm (0.47 in.) 12 mm (0.47 in.) Temperature probe — Built-in NTC (30 KÙ) Built-in NTC (30 KÙ) Connection Electrode cable Electrode plug 1 3* 6/7 2 4 6 2 5 6 2 4 7 2 4 6 + 8 2 5 6+8 2 4 7+8 2 4 6+8 2 5 6+8 * not included ** ±2 mm/±0.08 in. *** ±0.5 mm/±0.02 in.