Nirte to Nemst ί A new pH meter free of the tyranny of temperature At last, no RT/F to foul things up! No need for you to dial in solution temperature. No temperature probe for you to put into every solution along with your pH electrode. The new ORION Model 611 pH Meter is simplicity itself because it uses the pH electrode itself to sense solution temperature and to automatically produce temperature-corrected pH readings. That means there's one less source of sample carryover, and one less probe to break for one less operating expense.
Another ORION technological coup From the outside the 611 looks like a conventional pH meter except, as you can see, it has one less control to fiddle around with: the "Temperature" knob. On the other hand, the inside of the 611 is a whole new ballgame in pH meter design. Unique circuits monitor the resistance of the pH electrode's glass membrane as it varies logarithmically with the reciprocal of tempera ture, and automatically converts these variations into temperature corrections for the pH readings.
We call this technique "log R compensation," and it really works for you, with temperature-corrected pH readings regardless of electrode model or sample type...even if you're using a semi-micro electrode to measure a few drops at the bottom of a test tube, or you're getting the pH of a pickle with a spear electrode, or you're finding the surface pH of a culture plate with a flat-ended electrode.
Temperature, mV, and BOD to boot The 611 also lets you read electrode potentials in millivolts and temperature in degrees centigrade, using your pH electrode as the temperature sensor. The 611 doubles as a readout meter for BOD measure ments, too. A dedicated set of input connectors for the ORION 97-08 dissolved oxygen electrode lets you switch back and forth between pH, temperature, and oxygen readings.
Want to know more? Want a 611 demonstration or more information? Just send back the reader response card or, for even faster action, call us toll-free. Then you'll be able to say "Nuts!" to Nernst.
ORION RESEARCH 840 Memorial Drive, Cambridge, MA 02139
(800) 225-1480 or (617) 864-5400 CIRCLE 156 ON READER SERVICE CARD
