User manual EUTECH INSTRUMENTS 2-WIRE PHORP TRANSMITTER

[. . . ] EUTECH INSTRUMENTS 4 Installation 2-Wire pH or ORP Transmitter Operating Instructions Operating with one or several Transmitters: Figure 1 - Operating with 1 Transmitter 1 Preface Thank you for purchasing the Eutech pH or ORP Transmitter. [. . . ] Tel: (65) 778 6876; Fax: (65) 773 0836; e-mail: marketing@eutechinst. com; Home page: http://www. eutechinst. com Figure 2 - Operating with several transmitters 5 Electrical Connections 2 Introduction The Transmitter is used for the continuous measurement of pH, ORP (REDOX), Conductivity, Dissolved Oxygen or Temperature, in conjunction with an appropriate sensor. The Transmitter is housed in a IP65 enclosure, with openings for input and 4-20mA output. NOTE: In electrically "noisy" environments, select `Symmetrical' mode of operation and connect a stainless steel rod (Potential Matching Pin - PMP) as shown above. Ensure both the PMP and pH or ORP electrodes are immersed into the solution, even when performing calibration. 3 Diagram and Dimensions (in mm) 6 Before Calibration Remove cover of Transmitter and ensure that electrode is correctly connected as above. Connect Amp meter to the 4/20mA output of Transmitter (Appendix 1). 7 1) 2) pH Transmitter Calibration Calibrate in pH 7. 00 buffer first, and then in either pH 4 or pH 10. First, immerse clean pH electrode into a container with fresh pH 7. 0 buffer solution; 68X256901 Rev 1 10/99 3) 4) 5) 6) 7) 8) 9) Amp meter should read 12mA; if not, calibration is necessary; Locate "Offset adjustment" trimmer; Using a fine screwdriver, slowly turn trimmer till Amp meter reads 12mA; For greater accuracy, adjust slope with pH 4 or 10; Rinse probe in de-ionised water and immerse in either pH 4. 01 or pH 10. 01 buffer solution; In pH 4. 01, the output is 8. 54mA; In pH 10. 01, the output is 15. 44mA; Using a fine screwdriver, slowly turn trimmer, marked `slope', till Amp meter reads correct mA value with respective buffer solutions. Figure 4 - Method Two 11 pH Ordering Information Item Cat Code ECPHXTR ECARTSO05B ECARGTSO05B 10) Remember to disconnect Amp meter and close cover. NOTE: For other buffer values, expected current output is based on: mA = {(16/14) x buffer pH value} + 4mA pH Transmitter 8 1) 2) 3) 4) 5) 6) 7) 8) 9) ORP Transmitter Calibration Prepare fresh Standard solutions, such as 255mV, 470mV. Short ORP inputs and observe Amp meter display; Amp meter should read 4mA; if not, calibration is necessary; Locate "Offset adjustment" trimmer; Using a fine screwdriver, slowly turn trimmer till Amp meter reads 4mA; For greater accuracy, adjust the slope with Standard calibrating solutions; Rinse probe in de-ionised water and immerse in standard solution; In 255mV solution, the output is 8. 08mA; In 470mV solution, the output is 11. 52mA; Using a fine screwdriver, slowly turn trimmer, marked `slope', till Amp meter reads correct mA value with respective Standard solutions. Combination pH Electrode, General, integral 5m cable Combination pH Electrode, w/PMP, integral 5m cable Dissolved Oxygen Item Dissolved Oxygen Transmitter General Purpose D. O. [. . . ] for 24V Item 120V Power Supply 220V Power Supply Cat Code EC-120-XTR EC-220-XTR Housing 77 x 77 x 28 mm, field mountable 10 Appendix 1 Connecting Amp Meter for Calibration Figure 3 - Method One 68X256901 Rev 1 10/99 [. . . ]