User manual EUTECH INSTRUMENTS ALPHA PH 800 PHORP CONTROLLERTRANSMITTER

[. . . ] EUTECH INSTRUMENTS lpha-pH800 pH and ORP Controller/Transmitter Operating Instructions 68X216813 03/99 Preface Thank you for purchasing the lpha-pH800 series pH/ORP controller/transmitter. This manual serves to explain the use of the lpha-pH800 series pH/ORP controller/transmitter. The manual functions in two ways, firstly as a step by step guide to help the user operate the instrument. This instruction manual is written to cover as many anticipated applications of the lpha-pH800 pH/ORP controller/transmitter. [. . . ] An allowance of ±120mV is allowed to correct for electrode deviations. This feature is useful for prolonged on-line applications. The controller will add or subtract the value from the measured pH and display the correct value. Should the offset value be too high, consider performing maintenance on the electrode followed by calibration. If the calibration is unsuccessful, please replace the electrode. SETUP 1) Take a sample from the system and note the pH HOLD Ofs reading displayed on the controller. 2) Measure the pH of the sample using a calibrated pH tester, hand-held meter, or bench meter. Record SETUP the correct pH value. HOLD -0. 05 7. 00 3) Enter Advanced set-up mode. 4) Press the or keys to scroll until the upper display shows OFS. 5) Press the ENTER key. 6) Press the or keys until the pH value coincides with the correct pH value noted in Step 2. As the or keys is pressed to adjust the pH value, the `offset' value in the upper display also changes. 14 7. 2 7. 2. 1 Setting temperature (Set oC) sub-function Selecting automatic or manual temperature compensation 1) Enter Advanced Set-up mode by pressing the ENTER key. 2) Press the or keys to scroll until the display shows "Set C". HOLD SETUP o SEt o 3) Press the ENTER key. The lower display shows "Atc"; the upper display shows "on" or "oFF" depending on whether or not ATC is selected. 5) Proceed with additional Advanced Set-up procedures (press ENTER again) or return to Measurement mode by pressing the and keys (escape) simultaneously. SETUP HOLD SETUP HOLD C Atc on oFF Atc 7. 2. 2 Temperature calibration (ATC mode only) SETUP HOLD 1) Select "ATC on" as described above in Section 7. 2. 1. The current measured temperature is shown in the SETUP on Atc lower display. 3) Compare the current measured temperature on the controller display to a thermometer known to be accurate. Note down the correct temperature value. HOLD 25. 0 ATCC 0. 0 o 15 4) Press the or keys to scroll the lower display to match the correct value. You can offset temperature up to ± 5 C. o 5) Press the ENTER key to confirm your selection. 6) Continue with additional Advanced Set-up procedures, or return to the Measurement mode by pressing the and keys (escape) simultaneously. 7. 2. 3 Setting manual temperature compensation operation. SETUP HOLD Note: This option is not available when the controller is set for ATC oFF Atc For manual temperature compensation, two different temperatures: process and calibration, can be input independently. This SETUP HOLD allows calibration at a temperature other than 25. 0 P. C the process temperature. Example: setting a calibration o temperature of 25 C o allows calibration using standard buffer solutions at SETUP HOLD 25. 0 C. C 25 C, even if the process temperature is different. 1) Select "ATC oFF" as described above in section 7. 2. 1 2) Press the ENTER key. The upper display o shows the current process temperature and the lower display shows "P. [. . . ] The only difference is that the controller will revert back to Set-up mode (instead of Measurement mode) after calibration is completed. 7. 5. 1 Entering Calibration mode from Advanced Set-up mode 1) Enter Advanced Set-up mode. 2) Press the or keys to scroll until the upper display shows "CAL". 3) See section 6 for complete calibration procedures. 23 8 TECHNICAL SPECIFICATIONS pH Range Resolution Relative Accuracy mV Range Resolution Relative Accuracy Temperature Resolution Relative Accuracy Sensor Temperature Compensation Set-point and Controller Functions Function (switchable) Controller characteristics Pickup / Dropout delay Switching pH hysteresis Switching ORP hysteresis Contact outputs, controller Switching voltage Switching current Switching power Electrical Data and Connections Power Requirements Frequency Signal Output Load pH / ORP input Connection terminal Mains fuse / fine wire fuse EMC Specifications Emissions Susceptibility Environmental Conditions Ambient temp. operating range Relative humidity Mechanical Specifications Dimensions (control panel housing - L x H x W) Weights (control panel housing) Material Insulation (Front / Housing) -2. 00 to 16. 00 pH 0. 01 pH ± 0. 01 pH - 1000 to +1000 mV 1 mV ± 1 mV - 9. 9 to + 125. 0 oC 0. 1 oC ± 0. 5 oC Pt 100 /Pt 1000 (jumper selectable) Auto / manual (reference at 25. 0 oC) Set-point controller Limit controller 0 to 2000 sec. [. . . ]