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. Secondly, it serves as a handy reference guide. This instruction manual is written to cover as many anticipated applications of the lpha-pH800 pH/ORP controller/transmitter. If you have doubts in the use of the instrument, please do not hesitate to contact the nearest Eutech Instruments' Authorised Distributor. The information presented in this manual is subject to change without notice as improvements are made, and does not represent a commitment on part of Eutech Instruments Pte Ltd. Eutech Instruments cannot accept any responsibility for damage or malfunction of the unit due to improper use of the instrument. Copyright 1999 Eutech Instruments Pte Ltd. Version 1.0. rights reserved. Eutech Instruments Pte Ltd. Blk 55, Ayer Rajah Crescent #04-14/24, Singapore 139 949. Tel: (65) 778 6876; Fax: (65) 773 0836; e-mail: marketing@eutechinst.com; Home page: http://www.eutechinst.com All TABLE OF CONTENTS 1 INTRODUCTION................................................................................................ 1 1.1 Description of Unit.................................................................................... 1 1.2 Applications................................................................................................ 2 2 ASSEMBLY AND INSTALLATIONS ............................................................. 3 2.1 Measurement and Control System........................................................ 3 2.2 Unit Dimensions ....................................................................................... 3 3 ELECTRICAL CONNECTIONS....................................................................... 4 3.1 Connection Diagram................................................................................ 4 3.2 Back Panel................................................................................................ 6 4 OVERVIEW....................................................................................................... 8 4.1 Keypad and Display................................................................................. 8 Function Groups................................................................................................... 9 4.2 Control Concept ....................................................................................... 9 5 MEASUREMENT............................................................................................ 10 5.1 Display in Measurement mode ............................................................ 10 6 CALIBRATION............................................................................................... 11 6.1 pH Calibration......................................................................................... 11 6.2 ORP ­ mV Calibration........................................................................... 13 7 ADVANCED SET UP MODE......................................................................... 14 7.1 Electrode Offset (OFS) sub-function................................................... 14 o 7.2 Setting temperature (Set C) sub-function ......................................... 15 7.3 Control Relay A/Control Relay B (SP1/SP2) sub-function............... 18 7.4 Configuration (ConF) sub-function ...................................................... 22 7.5 Calibration (CAL) sub-function............................................................. 23 8 TECHNICAL SPECIFICATIONS................................................................... 24 9 ACCESSORIES ............................................................................................... 25 10 GENERAL INFORMATION....................................................................... 25 10.1 Warranty.................................................................................................. 25 10.2 Packaging ............................................................................................... 25 10.3 Return of Goods..................................................................................... 26 10.4 Guidelines for Returning Unit for Repair ............................................ 26 11 APPENDICES.............................................................................................. 27 11.1 Appendix 1 .............................................................................................. 27 11.2 Appendix 2 .............................................................................................. 28 11.3 Appendix 3 .............................................................................................. 29 1 1.1 INTRODUCTION Description of Unit Thank you for purchasing Eutech's ¼ DIN alpha-800 series pH/ORP process controllers. This unit is used for measuring either pH or ORP parameter one at a time, and the operational mode is switchable from the menu. You can use this unit to measure pH or ORP with limit control. This controller has many user-friendly and safety features which include: · · · · · · · · · · · · Menu-driven program that simplifies set-up Built-in non-volatile memory backup to ensure that calibration and other information are not erased if power supply fails Push-button two-point calibration and electrode offset adjustment from the keypad Automatic temperature compensation (ATC) Manual temperature compensation setting without the ATC probe, with independent setting for calibration and process temperature 0 to 2000 second time delay adjustment on all relays ­ minimise false alarms Separately adjustable high and low set point hysteresis (dead bands) prevent chattering of relays around the set points Asymmetrical/symmetrical input for pH/ORP operation Large dual display LCD for easy reading with clear multiple annunciators, alarm status, operational and error messages Two switching contacts as set-point triggering relays Hold function freezes output current (4/20mA) and control relays LED indicators signal control activities to monitor controller status from a distance · Protection against electromagnetic interference ­ Input and output are free from external inference 1 1.2 Applications Use this controller in panel mounted enclosures for applications such as water treatment and monitoring, galvanic-decontamination, chemical processing food processing, clean or waste water control and neutralisation process. 2 2 2.1 · · · · · ASSEMBLY AND INSTALLATIONS Measurement and Control System a pH/ORP process controller a pH/ORP combination electrode with integrated or separate temperature sensor Pt 100/1000, an immersion, flow or process assembly with or without a potential matching pin (PMP) a final control element such as pump or valve a recorder A typical measurement system consists of: Flow Assemb ly pH Controller Chart Recorder Process Assembly with Electrode Measurement Cable Power Mains (220/110 VAC) 2.2 Unit Dimensions Flat Gasket (1mm) (To be Inserted By Customer) Note: The Taped Corners Have to Be On Top 92 + 0.5 92 56 32 92 + 0.5 96 max. 45 Mounting Cut-Out max. 175 The field-tested control panel housing is 96 x 96 mm; with protection class IP 54 (front). 3 3 3.1 ELECTRICAL CONNECTIONS Connection Diagram pH S/ V S/ 18 19 20 21 22 BNC PE/S Pt 100 Potential Matching Pin (PMP) Signal Input pH/ORP Power Mains Relay A Relay B Hold Input Signal Output pH mA 1 AC: L N 2 + 3 4 5 6 7 8 9 10 11 12 13 14 15 PE/S 16 17 PE * ) indicated contact positions are for currentless conditions 4 Temp. pH PE N 3 2 L S 0 / PA 21 20 19 18 S 1 22 BNC Symmetrical high-impedance connections Measuring Cable Potential Matching Pin (PM) pH Combination Electrode Temp. pH PE N 3 2 L 1 S 0 / PA 22 21 20 19 18 BNC Asymmetrical connections Measuring Cable Potential Matching Pin (PM) pH Combination Electrode 5 3.2 Back Panel The back panel consists of two connectors. The first connector is the 17-way PCB edge connector and the other is the 5-way connector. Connection for the 17-way screw terminals (from left to right): 1.AC mains live wire 2.AC mains neutral wire 3.AC mains protective earth wire 4.Low set relay resting position (NC) 5.Low set relay common 6.Low set relay working position (NO) 7.High set relay resting position (NC) 8.High set relay common 9.High set relay working position (NO) 10.No connection 11.No connection 12.No connection 13.Hold function switch terminal 1 14.Hold function switch terminal 2 15.No connection 16.4 - 20 mA for -ve connection 17.4 - 20 mA for +ve connection Connections for the 5-way screw terminals: 18. Pt100/Pt1000 lead 1 terminal 19. Pt100/Pt1000 sense lead terminal 20. Pt100/Pt1000 lead 2 terminal Note: If using a two-wire RTD, short terminal 19 to terminal 18. Pt 100/Pt 1000 is selectable via an internal jumper. Factory default is Pt100. See Appendix 1 for directions on switching the RTD type. 21. pH/ORP (potential matching pin) 21. pH/ORP (shield) 6 Pt100/ Pt1000 0V/ PAL S/ FUSE 250VAC 100mA (F) RELAY A L N PE RELAY B NC NC NC HOLD NC - + 7 4 OVERVIEW Keypad · Perform rapid 2-point calibration and view electrode status · Allows entry to Set up mode · Select individual functions within the function group of Set up mode · Store input data in the Set up mode · Start calibration in the calibration mode · Select various function groups in the Set up mode. · Set parameters and numerical values in sub functions of Set up mode If pressed continuously, the setting speed increases · Return to the Measurement mode when both keys are pressed together 4.1 Keypad and Display 4.1.1 4.1.2 Display The LCD display features two numerical displays that show status messages and measured values for easy, quick reference. The display provides shorttext information for setting parameters and configuration. SETUP READY HOLD MEAS: Measurement mode SETUP: Set-up mode of function groups pH CAL: Calibration mode of pH/ORP READY: Comes on after a successful C 25.0 ATC calibration · HOLD: Relay position and current output are frozen · ATC: Comes on in the ATC mode. Disappears in the Manual temperature Compensation mode. "ATC" flashes if the temperature probe is faulty in its ATC mode · Display for RELAY A/B. Green LED indicates measured value within limit while RED LED indicates measured value outside limit. MEAS CAL CON 7.00 o · · · · · Alarm display if limit value overshoot or the ATC probe fails. 8 Function Groups The main function and sub-function groups are organised in a matrix format for configuration and selection of parameters. The main function groups are: 1) Offset adjustment (OFS) 2) Temperature Measurement / compensation settings (Set C) 3) Control relay 1 configuration (SP1) 4) Control relay 2 configuration (SP2) 5) Configuration (ConF) 6) Calibration (CAL pH) o 4.2 Control Concept The main function and sub-function groups are organised in a matrix format as shown below. These functions can be accessed via the front keypad for configuration and selection of parameters. 9 5 5.1 MEASUREMENT Display in Measurement mode When the controller is initially powered on, it automatically enters into the Measurement mode after the large dual LCD displays all segments briefly. The upper display shows the measured pH or ORP value, while the lower display shows either the temperature value if the controller is set for pH measurement or "OrP" if it is set for ORP measurement. Annunciators at the right side of the display indicate whether the controller is set for pH or mV measurement.. Similarly annunciators or icons at the top or left side of the display shows the current status of controller, e.g. "MEAS", "SETUP", "CAL", "READY", etc. In addition, error messages also guide the user in time of any faulty conditions as indicated by "ERR" or icons flashing. 5.1.1 Check electrode performance To read current electrode slope and offset values: 1) Press the CAL key followed by the ENTER key. The upper display shows electrode slope. The lower display reading shows the pH reading at 0 mV. 2) Press the and keys to return to Measurement mode. 10 6 CALIBRATION Direct Calibration from the Measurement mode is possible via the CAL key. The Calibration procedure can also be accessed from the Advanced Setup mode. 6.1 pH Calibration This unit features five preset buffer values (1.00, 4.00, 6.86 or 7.00, 9.00, 9.18 and 10.00) for quick, two-point auto calibration. When calibrating this instrument, standard pH buffer solutions must be used. 1) Enter Calibration mode. While in the SETUP HOLD Measurement mode, push the CAL ...