Model PHO-1 - Dwyer Instruments, Inc.
Contents
1. The microprocessor based pH ORP Temperature Meter offers quick response and high accuracy Simultaneously mea sure and display pH from O to 14 pH O to 1999 mV and tem peratures up to 200 F 100 C Model PHO 1 meter features manual or automatic temperature compensation auto buffer recognition and data logging capabilities The recording inter val can be defined by the user The meter accepts any pH electrode with a BNC connector For additional convenience select model PHO 1K kit which contains a meter RS 232 cable batteries software pH electrode temperature probe gender changer carrying case and manual Measurement eee Resolution Accuracy __ O to 14 pH 0 001 pH 0 01 pH O to 600 mV ee 0 05 1 digit 601 mV to 1999 mV 0 1 O to 100 C Temp T 32 to 200 F 0 4 al 0 9 F DWYER INSTRUMENTS INC P O BOX 373 MICHIGAN CITY INDIANA 46361 U S A Phone 219 879 8000 Fax 219 872 9057 Bulletin E 90 PHO Model PHO 1 pH ORP Temperature Meter Specifications Installation and Operating Instructions 3 5 16 84 14 LOBES 215 18688 7 11 32 186 20 i 1 5 8 71 4 41 2 SPECIFICATIONS Input pH electrode with BNC connector temperature probe Range pH 0 00 to 14 00 pH mV O to 1999 mV Temperature 32 to 200 F O to 100 C Operating Temperature 32 to 122 F O to 50 C Compensated Temperature Limit Manual MTC 32 to 200 F2. O to 100 C Automatic ATC 32 to 200 F O to 100 C Operating Humidity Max 80 RH Sampling Rate About 1 5 time sec Battery Life Approximately 120 hours Power Supply Six AA batteries Power Current Approximately 20 mA DC Data Output RS 232 PC serial interface Dimension 7 4 x 2 9 x 2 187 mm x 73 mm x 53 mm Weight 1 Ib 45 kg meter only www dwyer inst com e mail info dwyer inst com Page 2 FRONT PANEL DESCRIPTION LCD Display Input Socket BNC connector for pH and mV Input Socket Earphone jack for temperature probe POWER Button Button for moving to the desired parameters LEFT Arrow Key Button for increasing the value of parameters UP Arrow Key 7 Button for moving to the desired parameters RIGHT Arrow Key 8 Button for decreasing the value of parameters DOWN Arrow Key 9 Button for entering escaping the mode of parameter set tings ENTER Button 10 Button for selecting temperature unit in C C Temperature Button 11 Button for selecting temperature unit in F F Temperature Button 12 TOGGLE Button 13 0H Button 14 mV Button 15 MEMORY Button 16 READ Button 17 CALIBRATION Button 18 TEST Button oOkRWN O pH TEMPERATURE COMPENSATION oH Temperature Compensation ensures proper pH values by correcting temperature variances Compensation is accom plished manually by making adjustments in the compensation mode or automatically by usi
3. Procedure 1 Connect the temperature probe into the earphone jack Place the temperature probe into a 0 C ice solution 2 Press and hold the CALIBRATION button for 3 seconds Press the C button 4 Press ENTER button to complete calibration W MEASURING PROCEDURE pH Measurement Calibrate the instruments and pH electrode before measuring 1 Connect the pH electrode to the BNC socket 2 Power on the instrument by pushing the power on off button 3 Place the electrode into the solution to measure pH value 4 After each measurement rinse electrode with distilled water mV Measurement This instrument has a built in mV measuring function which is capable to take ORP or other precise mV measurements To switch to mV measurement press and hold mV key for one second Temperature Measurement 1 Plug the temperature probe into the temperature jack MTC will change to ATC 2 Place probe into the solution Data Hold To freeze a reading during measurement press the TEST TOG GLE button An A will be displayed on the LCD to indicate that the instrument is in hold mode To return to measuring status press the TEST TOGGLE button and the A indicator will be removed indicating the instrument is in measuring mode Recording Data The meter can perform single point data recording or continu ous recording Individual Recording Press the MEMORY button to record a single data point M1 M99 Continuous Recording Press
4. and hold the memory button for two seconds Display will show M followed by the set number M will blink each time a data point is recorded Recalling Memory To view individual points press READ button the LCD will show the last record Press UP and DOWN button to view the data that has been recorded R1 to R99 indicates the order of readings you measured To view the continuous recorded data requires use of the enclosed software To clear memory turn off instrument Press and hold the MEM ORY button Press POWER button CLt will be displayed on LCD to verify memory cleared ELECTRODE PRECAUTIONS AND LIMITATIONS 1 Do not allow the electrode to dry 2 Do not wipe the electrode tip Blot it with a lint free tissue 3 Do not leave the electrode in organic solvents strong basic solutions concentrated fluoride solutions or hydrofluoric acid for extended periods of time If measurements are made in these solutions readings should be taken quickly and the electrode should be rinsed immediately with deionized water After rinsing the electrode soak it in 7 0 buffer for two hours before using it again 4 Do not use the electrodes in solutions that exceed a temperature range of O to 100 C 5 PH only ELECTRODE CONDITION CHART 98 0 102 0 Electrode is in good condition 95 0 97 9 Electrode needs to be cleaned 92 0 94 9 Electrode needs to be cleaned Electrode needs to be renewed MAI
5. that the normal battery output is less than 6 8 V and is time to replace the battery 2 Remove the battery cover 3 Replace batteries with new batteries and replace back cover 4 Ensure the 6 AA battery cover is secured WARRANTY Calibration prior to use is recommended The internals of Model PHO 1 are not field serviceable and should be returned if repair is needed field repair should not be attempted and may void warranty Be sure to include a brief description of the problem plus any relevant application notes Contact customer service to receive a return goods authorization number before shipping Calibration prior to use is recommended FR R1 443346 00 www dwyer inst com e mail info dwyer inst com
6. NTENANCE Proper use and protection of the electrode will prolong the life of the glass membrane If your pH electrode is exhibiting slow response low slope values continuous drift or erratic read ings follow the procedure listed below Cleaning the pH Bulb 1 Protein contamination Soak the electrode bulb tip in a 10 solution of pepsin for 30 minutes Rinse with deionized water and soak the electrode in 7 0 buffer for two hours before using 2 Oil contamination Wash the electrode with a 50 water acetone solution Do not soak the electrode in the acetone solution or it will deteriorate the bottom seals of the plastic electrode Rinse with deionized water and soak the electrode in 7 0 buffer for two hours before using Recondition of the pH Bulb Only use this procedure if the preceding maintenance and cleaning procedures fail to restore acceptable electrode perfor mance Rinse electrodes immediately with deionized water and soak in 7 0 buffer for two hours before using Copyright 2005 Dwyer Instruments Inc DWYER INSTRUMENTS INC P O BOX 373 MICHIGAN CITY INDIANA 46361 U S A Printed in U S A 9 05 Phone 219 879 8000 Fax 219 872 9057 CAUTION To prevent permanent damage care should be taken to prevent liquid from entering the pH meter Also if instrument will not be in service for an extended period of time please remove batteries BATTERY REPLACEMENT 1 When the LCD shows it indicates
7. ng the temperature sensing probe in tandem with the pH electrode Temperature Compensation Mode 1 Automatic temperature compensation ATC Plug the temperature probe into the top jack marked temperature ATC will appear at bottom of the display Immerse probe in test solution 2 Manual temperature compensation MTC Manually enter the temperature of the test solution between O and 100 C An ATC probe will override manual compensation The preset temperature of pH Meter is 25 C See setup procedure to set MTC SETUP PROCEDURE Please follow the steps to set up the parameters for calendar year month day and time hour minute manual temperature compensation MTC and recording time interval 1 Press ENTER for 2 seconds until a second beep is heard This signals that you are entering the setup mode 2 To change the year press the UP or DOWN arrow keys 3 Press the RIGHT arrow key to set up for next parameter 4 To change the month press the UP or DOWN arrow keys 5 Press the RIGHT arrow key to set up for next parameter 6 To change the date press the UP or DOWN arrow keys 7 Press the RIGHT arrow key to set up for next parameter 8 To change the hour press the UP or DOWN arrow keys 9 Press the RIGHT arrow key to set up for next parameter 10 To change the minute press the UP or DOWN arrow keys 11 Press the RIGHT arrow key to set up for the next parame ter 12 To change manual temperature com
8. pensation MTC press the UP or DOWN arrow keys 13 Press the RIGHT arrow key to set up for the next parame ter 14 To change the interval time press the UP or DOWN arrow keys This is the time between measurements in the continuously recording mode 15 To finish the settings and return to measuring mode press ENTER CALIBRATION pH Calibration Procedure To ensure accuracy calibration procedure should be done at the initial setup of the instrument and periodically through the life of the sensor If the accuracy is outside the limits of the instrument the display will show Err 1 Connect the pH electrode to the BNC socket and place the electrode into the buffer solution 0H 7 00 1 L h yli i LS BILE q N 4 Oe ao amp i i i imf E il i 2 If using ATC connect the temperature probe to the temperature jack and place probe into buffer solutions otherwise the unit will default to MTC 3 Wait for the reading to become stable 4 Press and hold CALIBRATION button for 3 seconds to enter the calibration mode 5 Press pH button The preset value is pH 7 000 or user can press the UP or DOWN arrow keys to select the desired pH value Ss H 1000 n de SBc 6 Press ENTER button to offset calibration 7 Rinse electrode and blot with lint free tissue 8 For second buffer solution OH 4 010 repeat steps 2 to 7 Page 3 Temperature Calibration
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