Alpha pH 100 C/CX pH/ORP Controller / Transmitter INSTRUCTION MANUAL 7.0 pH/OR o MODE ENTER RELAY C SETU READY Technology Made Easy ... Preface This manual serves to explain the use of the Alpha pH 100 pH/ORP Controller/Transmitter. The units covered are Alpha C and CX pH/ORP Controller/ Transmitter. The instruction manual functions in two ways: first, as a step by step guide to help you operate and understand the operation of the unit and second, as a handy reference guide. The information presented in this manual is subject to change as improvements are made, and does not represent a commitment of Eutech Instruments Pte Ltd. This instruction manual is written to cover as many anticipated applications of the Alpha pH 100 C/CX pH/ORP Controller/Transmitter as possible. If there are doubts in the use, please do not hesitate to contact the nearest Eutech Instruments' Authorized Distributor or us at (65) 778-6876. Eutech Instruments cannot accept any responsibility for damage or malfunction of the unit due to improper use of instrument. Copyright 1994 Eutech Instruments Pte Ltd. Version 1.0 1 TABLE OF CONTENTS 1. 2. Introduction------------------------------------------------------------ 3 Getting Acquainted-------------------------------------------------- 4 2.1 Front Panel............................................................. 4 2.2 Back Panel ............................................................. 5 2.3 Selecting pH/ORP Measurement Mode .................. 6 2.4 Wiring ..................................................................... 6 3. Operating the Controller ------------------------------------------- 7 4. 3.1 The Main Display.................................................... 7 Setting Up the Controller ------------------------------------------ 8 4.1 4.1.1 4.1.2 Setting and Changing the Password....................... 8 Setting New Password......................................................... 8 Changing the Password....................................................... 9 5. Calibrating the Controller ---------------------------------------- 10 5.1 5.2 5.2.1 The Lower Level Menus........................................ 10 Calibrating for pH Measurement ........................... 10 The CAL PH menu............................................................. 10 5.3 5.4 5.5 5.5.1 5.5.2 Changing the Offset.............................................. 11 Calibrating for ORP Measurement ........................ 12 Calibrating for Temperature Measurement ........... 12 The CAL °C Menu.............................................................. 12 ATC ON/OFF ..................................................................... 13 5.6 5.6.1 5.6.2 5.6.3 5.6.4 Setting the Alarm Feature ................................... 15 The Hi SET Menu .............................................................. 15 The Hi HYS Menu .............................................................. 16 The Lo SEt Menu ............................................................... 17 The Lo HYS Menu ............................................................. 18 6. Using the Controller Current Loop for Datalogging (for Transmitter Model Only)------------------------------------------------- 19 7. Additional Information -------------------------------------------- 20 8. Appendix 1 - Jumper Positions (Inside Controller) ------- 21 9. Appendix 2A - Jumper Positions (pH) ----------------------- 23 10. Appendix 2B - Jumper Positions, ORP --------------------- 24 11. Appendix 3 - pH Offset / Slope -------------------------------- 25 12. Technical Specifications ---------------------------------------- 26 2 1. Introduction The alpha pH 100 series pH/ORP Controller/Transmitter is the latest innovation of process controllers from Eutech Instruments. Incorporated with the ASIC (Application Specific Integrated Circuit) microprocessor technology, this panelmounted on-line controller provides many user-friendly features desirable in pH/ORP controllers. This versatile pH/ORP unit can be used either for measuring and monitoring pH or ORP values at one time. It cannot be used for measuring both parameters simultaneously. When shipped, it will be set internally to the pH mode by means of an internal jumper. This jumper can be reset by you to select between the pH and ORP mode. Some of the features of this Controller are : · · · · · · · · · · · Automatic temperature compensation (with PT 100) Manual temperature compensation setting without the temperature probe Push button calibration up to 3 points Offset adjustment High and low alarm triggering relays User-defined password feature to prevent unauthorized entry to change the calibration data, hysteresis function, high and low setpoints information Alarm and operational message annunciators Hysteresis function to prevent chattering of relays around the setpoint High-end transmitter model with 4-20 mA current output for datalogging purposes (pH CTP0100 only) Built-in memory backup to ensure that calibration and other information will not be erased if power supply fails Switchable mains voltages of 110 VAC or 220 VAC via user selectable internal jumper 3 2. Getting Acquainted 2.1 Front Panel The front panel consists of a 3 digit LED display together with 5 LED annunciators. There are also 4 keys as shown below. 888 pH/ OR o MODE ENTER RELA Y C SETUP REA DY The keys available are the v (UP/INCREMENT), w (DOWN/DECREMENT), MODE and ENTER keys. The annunciators are pH/ORP, °C, SETUP, READY, and RELAY. The function of the annunciator is to provide additional information, for example, the pH/ORP annunciator lights up in pH/ORP measurement mode. The READY annunciator lights up when the pH/ORP stabilizes. RELAY lights up when any of the HI SET or LO SET relays is activated. The MODE key allows you to select between pH or ORP display, the temperature display or the SETUP menu display. While in one of the SETUP menus, it also functions as an ESCAPE key. For example, while setting the Hi SET point, you can press MODE key if you change your mind about changing this information. You can confirm changes or to enter into further levels of the lower menu by pressing the ENTER key. The v (UP/INCREMENT) and w (DOWN/DECREMENT) keys allow you to change information or to select between different menus. Holding down the key increases the scrolling speed, i.e. changeover of 1st digit (ones) to 2nd (tens) and then 3rd digit (hundreds). 4 2.2 Back Panel The back panel consists of two connectors. The first one is a 4way screw terminal and the second is a 12-way screw terminal. Refer to the label on top of the unit for diagram. The connection for the 4-way screw terminals are (from the left to right): 1. PT 100 connection 2. PT 100 connection 3. No connection 4. No connection The connections for the 12-way screw terminals are (from left to right), 5. Low Set Relay deactivated position 6. Low Set Relay center pole 7. Low Set Relay activated position 8. High Set Relay deactivated position 9. High Set Relay center pole 10. High Set Relay activated position 11. 4-20 mA - ve connection (for transmitter models only) 12. 4-20 mA + ve connection (for transmitter models only) 13. Protective earth 14. Protective earth 15. Neutral 16. Live 5 2.3 Selecting pH/ORP Measurement Mode You can set the appropriate pH/ORP measurement mode from the jumper. See Appendix 1 for details on the jumper positions for pH mode and Appendix 2 for jumper positions for ORP mode. 2.4 Wiring Connect the power supply to the GND (EARTH) - 13 or 14, NEUTRAL - 15 and LIVE - 16 screw terminals. Make sure that the power supply jumper setting matches the mains voltage (110 VAC or 220 VAC). See Appendix 2 for the jumper setting for the voltage selection. Connect the pH electrode to the BNC connector at the back panel. Wire up the PT 100 temperature probe to the PT 100 connections (see back panel connections). Power on the controller and the display automatically shows the pH/ORP reading. The pH/ORP annunciator lights up. Once the reading is stable, the READY annunciator lights up. However, if the PT 100 temperature probe is not connected, automatic temperature compensation does not function. You can set the temperature at a selected value. The temperature is set to factory default at 25.0 oC. NOTE : Eutech Instruments will not be responsible for incorrect application of the controller using improper voltage sources or wrong jumper settings. 6 3. Operating the Controller 3.1 The Main Display Press MODE key to switch to three main displays - the pH/ORP display, the temperature display and "SEt" display. Press MODE key once to get into the temperature measurement. The °C annunciator lights up when you are measuring temperature. The display shows current measured temperature (with ATC) or the temperature that was set in MTC mode. Press MODE key again and the display toggles to the "SEt" for SETUP menu. 7.4 pH/OR P MODE ENTER 24.0 o MODE ENTER C SEt SETUP MODE ENTER Press ENTER key to go into the lower-level setup menus while the display shows "SEt". These lower-level menus allow calibration of pH/ORP, Temperature and other parameters including set password, Hi or Lo Setpoints, and Hi or Lo Hysteresis values. 7 4. Setting Up the Controller 4.1 Setting and Changing the Password 4.1.1 Setting New Password To set a password, press MODE key until the "SEt" is displayed. ENTER 1. Press ENTER key and the SETUP display shows "CAL" and "PH" alternately. Press v key once and the display shows "SEt" MODE "id". ENTER 2. Press ENTER to enter your desired password. Follow the SETUP steps below (e.g. using a password "123"). MODE 1. Initially, the display shows "000" with the first digit blinking. ENTER SETUP 2. Use v (UP/INCREMENT) key to enter "1" on the 1st digit of the password. Press ENTER once and the second digit will MODE blink. Similarly, enter the ENTER second digit of the password "2" SETUP and press ENTER key again. Repeat with the third digit accordingly. 3. Press ENTER key and the MODE display shows "CAL" and "PH" ENTER alternately. Use v or w key to SETUP get into the "SEt" and "id" menu, press ENTER and set your desired password by following the above steps. 1. Once completed, press ENTER to confirm and then press MODE key to return to the pH display. CAL MODE PH SEt id 123 8 To calibrate the controller at any time, you may have to enter the password that you set, in order to access the calibration mode. Once you have entered the password correctly, the display shows "CAL PH" indicating that you are in one of the lower-level SETUP menus. If you enter the wrong password, the display reverts back to the pH display. Alternatively, if you prefer no password protection, set the password to "000", "CAL PH" immediately displays after you press ENTER key while you are in the "SEt" menu. NOTE : The user set password is a protection code. Thus, it is very important to keep this password strictly confidential to authorized personnel. You are advised to remember the password that you have set, in order to protect the controller settings and prevent any unauthorized tampering to the system! IMPORTANT : In case the password set is forgotten, use the master password "555". 4.1.2 Changing the Password Enter the Set id menu with already set password or "555". Change a new password as per steps mentioned for setting the password. 9 5. Calibrating the Controller 5.1 The Lower Level Menus The "CAL PH/CAL OrP" display is the first menu seen upon entering the lower-level menus, depending on which mode is set. Press v or w key to display the various menus as shown in the figure below. Press ENTER key to go to the lower level menus. START CAL pH / CAL OrP SEt id Lo Hys CAL C o Hi SEt Hi Hys Lo SEt 5.2 Calibrating for pH Measurement 5.2.1 The CAL PH menu 1. Enter this menu by pressing the MODE key twice to the "SEt" display if you are in measurement mode. 2. Press ENTER key. If the password has been set earlier, key in the password using the method described in section 4.1. Press ENTER once to confirm. After you set the correct password, you can see the "CAL" and "PH" displays, blink alternately. 3. Press ENTER key to enter into the pH calibration mode. Dip both the pH electrode and temperature probe in the standard solution for a few minutes. 4. When "CAL PH" displays, press ENTER key. The current measured value (7 ±0.3 pH) will be displayed. Once the reading stablizes, press ENTER to confirm. 5. Use w keys to scroll to the other buffer values "PH4" and "PH10", in that sequence. Press ENTER to confirm and 10 complete the pH calibration, as fo pH 7.0. Press MODE key to return to measurement mode. Note : If the pH value is not near MODE to any buffer, pressing ENTER will not calibrate the controller. If at ENTER any point, you decide not to SETUP calibrate, you can return to the previous mode by pressing the MODE key. CAL PH SETUP ...