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LTH Electronics HPT63 Operation Manual

Ph / redox transmitter
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HPT63
pH / REDOX TRANSMITTER
OPERATION GUIDE

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Summary of Contents for LTH Electronics HPT63

  • Page 1 HPT63 pH / REDOX TRANSMITTER OPERATION GUIDE...
  • Page 3 PREFACE Product warranty The HPT63 has a warranty against defects in materials and workmanship for three years from the date of shipment. During this period LTH will, at its own discretion, either repair or replace products that prove to be defective. The associated software is provided ‘As is’...
  • Page 4 Preface Manufacturing Standards Electromagnetic compatibility This instrument has been designed to comply with the standards and regulations set down by the European EMC Directive Safety This instrument has been designed to comply with the standards and regulations set down by the European Low Voltage Directive using BS EN 61010-1 : 1993 Quality This instrument has been manufactured under the following quality standard: ISO 9001:2000.

  • Page 5: Table Of Contents

    Contents CONTENTS Introduction ....................1 About the HPT63 ................. 1 Unit Specification ................. 1 Safety & EMC..................... 3 Wiring Installation................. 3 Noise suppression................3 Installation....................5 Head-mounted Version Mechanics ............5 Wall-mounted Version Mechanics............7 Dip Tube Assembly ................8 Connections ..................
  • Page 6 Contents 10.1 On-Line/Off-Line Operation ..............28 10.2 Calibration Access................28 10.3 Calibration Practices................29 10.4 pH Electrode Condition............... 29 10.5 Redox Sensor Calibration..............30 10.6 Temperature Calibration..............31 10.7 Current Output Calibration..............31 10.8 Resetting the User Calibration............32 Save/Restore ................... 33 Configuration....................
  • Page 7 Glossary GLOSSARY Liquid crystal display Light Emitting Diode Least Significant Bit Most Significant Bit Parts per million. Parts per thousand Platinum Resistance Thermometer. Programmable System Devices. Redox Reduction/oxidation. Chemical reaction involving oxidation and reduction. Resistive Temperature Device Set point.
  • Page 8 Contents...

  • Page 9: Introduction

    Introduction About the HPT63 The HPT63 is a microprocessor-controlled pH or Redox transmitter. The unit utilises a multifunction LCD to display readings and provide feedback to the operator. It is available with different options to provide fully configurable control, alarm and feedback with up to two relays and two 0/4-20mA current output sources.
  • Page 10 1 Introduction Current output Each selectable 0-20 mA or 4-20 mA into 1500 Ohms max., ( optional 1 or 2 outputs ) fully isolated to 2kV. Expandable up to 5% of any operating range (pH, mV, °C) and offset anywhere in that range. Operator adjustment ( Current ) ±1 mA zero and ±1 mA span for remote monitor calibration Set points and control relays...

  • Page 11: Safety & Emc

    European requirements for EMC. Noise suppression In common with other electronic circuitry, the HPT63 may be affected by high level, short duration noise spikes arising from electromagnetic interference (EMI) or radio...
  • Page 12 (RFI). To minimise the possibility of such problems occurring, the following recommendations should be followed when installing the unit in an environment where such interference could potentially occur. The following noise generating sources can affect the HPT63 through capacitive or inductive coupling. ♦ Relay coils ♦...

  • Page 13: Installation

    3 Installation Installation Head-mounted Version Mechanics This version of the HPT63 is designed for mounting on a pipe T-piece with the sensor in the main current flow. Figure 1 shows the dimensions of the components required for installation. Figure 2 shows the dimensions of the completed assemblies.
  • Page 14 3 Installation 138mm 116mm 116mm Ø63mm Ø Figure 2 Head-mounting component dimensions...

  • Page 15: Wall-Mounted Version Mechanics

    3 Installation Wall-mounted Version Mechanics This version is mounted on a wall and connects to sensors via a (maximum) 10m cable. Figure 3 shows the dimensions and fixing points of the unit. 152mm 140mm 118mm 48mm 73mm 22mm Figure 3 Wall-mounted unit dimensions...

  • Page 16: Dip Tube Assembly

    3 Installation Dip Tube Assembly 1624 - 316 STAINLESS STEEL ADJUSTABLE BRACKET NYLON COATED TUBE CLIPS FASTENERS TANK WALL 3O DEG GASKET/SEAL (NOT SUPPLIED) 55O MAX 115O MAX CENTRE HOLE CLEARANCE REQUIRED 36 TO 38 DIA 2O DIA 2O DIA...

  • Page 17: Connections

    3 Installation Connections Figure 4 : Panel mount unit, rear view Connections to the unit are made via the three circular connectors on the side of the unit plus an underside connector for the wall-mounted version. The connections are as follows: 3.4.1 Connector 1 PS Input and Current Outputs Free female socket...
  • Page 18 3 Installation 3.4.2 Connector 2 Digital Range Selection Inputs Free female socket. Advanced version only. Function Digital common Not used Not used Digital input 3 Digital input 1 Digital input 2 Not used 3.4.3 Connector 3 Relay Outputs Free male plug. Advanced version only. Function Relay 1 common Relay 1 normally open...
  • Page 19 3.4.6 Current Output Connections The Basic HPT63 has a single current output of 0-20 or 4-20 mA. The Advanced version has two such outputs designated A and B. The current output ranges are selected via the instrument menu. For best noise immunity use a screened twisted pair cable, with the screen connected to Earth at one end.

  • Page 20: Digital Inputs

    3 Installation Figure 5 : Relay contact connection Depending on the load, a contact arc suppressor may be required to prevent excessive electrical noise. To switch more than 5 Amps, use a slave relay. Figure 6 : Slave relay connection Digital Inputs The digital inputs are used to externally initial a cleaning cycle or to take the unit off line.

  • Page 21: User Interface

    Failure to do so may result in an electrically hazardous installation, or degrade instrument performance. When shipped, the HPT63 is configured to the default pH set-up ( see Appendix A – Factory Default Setups). In this state the instrument can perform all of the necessary function for a basic pH monitoring instrument.

  • Page 22: The Menu System

    4 User Interface The four keys - - allow the user to control and configure the unit. The keys are used for changing display options, navigating around the menu system and for changing unit parameter values. To operate a key, press it until the display responds (about half a second).

  • Page 23: Unit Configuration

    4 User Interface Unit Configuration The unit can be configured by navigating around the menu system and setting up the various unit facilities. The general principle of setting a parameter is as follows: Use the , and keys to navigate to the parameter to be changed. Press the key to select the parameter for editing.

  • Page 24: Number Entry

    4 User Interface Number entry keys allow you to set up a number between 0000 and 9999 on the main seven-segment display as a parameter value or access code. To set up a number, proceed as follows: Press to begin editing a number. The first (left-hand) digit will start to flash. Use the keys to increment or decrement the flashing digit.

  • Page 25: Main Display

    5 Main Display Main Display There are two modes of display operation – digital and bargraph. The mode can only be changed via the Configuration menu, requiring a Level 2 access code. In bargraph mode, the display shows an analogue representation of Output A or B, or both, alternating.

  • Page 26: Menu Access

    6 Menu Access Menu Access The instrument parameters are protected against unauthorised or accidental tampering by access codes. There are three levels of access – Basic, Level 1 and Level 2. For Basic access, no access code is required but access is restricted to the main display modes. A user with Level 1 access can change some parameters and Set Point trigger levels.

  • Page 27: Parameters

    Simulated input Units The HPT63 can be set up as either a pH or a Redox instrument. This is achieved by simply setting the appropriate units (either pH or mV). The rest of the menu structure for the instrument responds by enabling and disabling the appropriate menu items (e.g.

  • Page 28: Electrode Type

    7 Parameters Electrode Type The HPT63 can scale its pH input readings to operate with either a glass or antimony electrode. This sets the isopotential point, for a glass electrode this is 7.00pH, for an antimony electrode it is 0.00pH.

  • Page 29: Simulated Input

    7 Parameters Simulated Input The facility exists within the HPT63 to simulate the input sensor levels to test the set point and current output operation. This function allows the user to cycle up and down through the sensor range using the keys keys and display the current output level, with the relays responding accordingly.

  • Page 30: Set Point Relays

    Set Point Relays Two Set Point relays, designated SP1 and SP2, are fitted on the Advanced version of the HPT63. No relays are fitted on the basic version. Indicators on the front panel show when a relay has operated. A relay can be set to operate when a sensor or temperature set point is exceeded or when an alarm occurs.

  • Page 31: Set Point Source

    8 Set Point Relays Set Point Source Each set point relay can be disabled or triggered from a sensor input (the default), a temperature input or from an alarm. Set Point Trigger The set points can be configured to trigger from the sensor or temperature source in six ways: Trig: Hi The relay will be activated when the source input becomes greater...

  • Page 32: Set Point Mode

    The hysteresis level should therefore be set to be a little larger than the input noise level. In addition to the On/Off mode the HPT63 also provides two forms of pseudo proportional control, which can be used to control the levels to a defined value when used in conjunction with a pump or valve.

  • Page 33: Dose Alarm Timers

    8 Set Point Relays 8.3.3 Pulse Proportional Mode The Pulse Proportional (or PP) mode is intended to drive solenoid type dosing pumps which have the facility to accept an external pulse input. The proportional band operates in the same way as the Time Proportional mode. The output relay now operates by producing a series of pulses of fixed duration.

  • Page 34: Current Output

    9 Current Output Current Output The current output menu structure contains all of the necessary set-up functions to configure the current output source(s). If one current output is fitted, then the menu will be as follows. If two current outputs are fitted they are referred to as A and B respectively.

  • Page 35: Proportional Control

    9 Current Output Proportional Control Many devices such as motor speed controllers, valve actuators, or stroke positioners will accept an analogue 4-20 mA control signal. It is possible to use the measurement signal from the instrument as a control signal. By setting the point at which the output is 4 mA as the set point (e.g.

  • Page 36: Calibration

    10.2 Calibration Access A feature has been included in the HPT63 to allow users to access the sensor calibration from the main display. To enable this feature, set Cal Access? to Y. To disable this feature, thus preventing the users from altering the calibration from the...

  • Page 37: Calibration Practices

    Use clean beakers and bottles for standard solutions. • The HPT63 can be taken offline, which de-energises the relays and holds the current outputs at their last values. This facility is useful when calibrating the system, however the operator must ensure the relays are in a safe state when using this feature.

  • Page 38: Redox Sensor Calibration

    10 Calibration Check the temperature of the solutions. From the documentation supplied with the solutions, determine the true values of the solutions at the measured temperatures. Use these (true) values for calibration purposes. Note: Appendix D – Buffer Solutions lists typical buffer solution pH values at various temperatures.

  • Page 39: Temperature Calibration

    10 Calibration 10.5.2 Procedure Make up a standard Redox solution in accordance with the instructions supplied. Immerse the electrode system in the solution. From the Sensor Buffer page, press the key. The screen will display ‘Are you sure?’. Press to confirm (or any other key to abandon calibration). On pressing , the display will show the sensor reading..

  • Page 40: Resetting The User Calibration

    10 Calibration 10.8 Resetting the User Calibration This option resets all of the user calibrations to their default. From the Reset User Cal page, press the key. The message ‘Are you sure?’ will appear. Press confirm and continue with the reset, or any other key to abandon the reset.

  • Page 41: Save/Restore

    11 Save/Restore 11 Save/Restore This facility allows you to save and recover two instrument set-ups. The menu structure is as follows: Save/Restore Save as Setup A Save as Setup B Restore Setup A Restore Setup B Default pH Default Redox To use these functions select the Save/Restore menu item and use the keys to select the required function.
  • Page 42 11 Save/Restore commissioning or testing the instrument. Remember to Save the normal set-up first and restore it afterwards. If corruption of data is reported by the software with an error message, the saved set- up can be copied back into the Working stores from either the A or B stores.

  • Page 43: Configuration

    12 Configuration 12 Configuration Options on the Configuration menu allow you to set up some basic operating parameters. The menu structure is as follows: Configuration Language (some units only) English Francais Espanol Italiano Temperature Input sensor (T input) PT1000 3k Balco Disabled Errors Enabled...

  • Page 44: Language

    12 Configuration 12.1 Language This option is not available on some (English-only) units. Use the keys to select the required language and the key to confirm your selection. 12.2 Temperature Input Sensor Use the keys to select or disable the temperature sensor and the to confirm your selection.

  • Page 45: Cleaning Menu

    13 Cleaning Menu 13 Cleaning Menu Cleaning Duration Interval On/Off-line Recovery time (Off-line) or Delay Y/N (On-line) A set point relay can be configured to operate a jet spray wash or rotary electrode cleaning system on a timed cycle. The purpose is to prevent accumulation of particulate matter on the active surfaces of the sensor.
  • Page 46 13 Cleaning Menu Typical Operation with Clean Offline Duration Recovery Interval Clean Relay Set point Normal Relay Current Hold Normal Output Offline Lamp...

  • Page 47: Fault Finding

    NOTE : THERE ARE NO USER SERVICEABLE PARTS INSIDE THE UNIT The HPT63 has been designed to include a wide range of self diagnostic tests, some of which are performed at switch on, and some on a continuous basis. This guide aims to provide a route to diagnosing and correcting any faults that may occur during normal operation.
  • Page 48 14 Fault Finding Check that the correct sensor units have been selected within the Parameters menu (see Section 7.1 Units). If the units are set to pH, check the temperature compensation state (see Parameters Section 7.3 Temperature Input). If the compensation is set to Manual, check that the fixed temperature is at the correct level.

  • Page 49: Problems With Cables And Connectors

    14 Fault Finding ♦ Where practical check the temperature sensor resistance against the table in Appendix E – Temperature Sensor Data. Current Output is Incorrect or Noisy ♦ Check that the maximum load resistance for the current loop has not been exceeded.
  • Page 50 14 Fault Finding collect around any of the connections between the electrode and the instrument. This includes any connectors or junction boxes which may be used. Particular attention must be paid to the method of extending the pH electrode cable. A general rule would be the fewer connections there are, the less problems are likely to occur.

  • Page 51: Guarantee And Service

    LTH manufacture, which are subject to a separate agreement. All sensors made by LTH Electronics Ltd are thoroughly tested to their published specification before despatch. As LTH have no control over the conditions in which their sensors are used, no further guarantee is given, although any complaints concerning their operation will be carefully investigated.
  • Page 52 15 Guarantee and Service...

  • Page 53: Appendix A - Factory Default Setups

    16 Appendix A – Factory Default Setups 16 Appendix A – Factory Default Setups Parameters Redox Units Electrode Type Glass Temperature Units °C °C Temperature Compensation Automatic Fixed Temperature Input +25.0°C +25.0°C Set Points SP1 Source Sensor Sensor SP1 Trigger SP1 Level ( Band High ) 7.00pH 200mV...
  • Page 54 16 Appendix A – Factory Default Setups Cleaning Duration ( mm:ss ) 00:05 00:05 Interval ( hh:ss ) 01:00 01:00 Mode Off-Line Off-Line Recovery ( mm:ss ) 00:05 00:05 Delay Current Output Output A Source Sensor Sensor Output A Mode 4-20mA 4-20mA Output A Zero...

  • Page 55: Appendix B - Customer Setup

    17 Appendix B – Customer Setup 17 Appendix B – Customer Setup Use this appendix to record unit settings. Instrument Serial No …………………………… Sensor Serial/Type No …………………………… Parameters Set up Units Electrode Type Temperature Units Temperature Compensation Fixed Temperature Input Set Points SP1 Source SP1 Trigger...
  • Page 56 17 Appendix B – Customer Setup SP2 Hysteresis ( % of SP Level ) SP2 Cycle Time ( mm:ss ) SP2 Proportional Band (% of range) Cleaning Duration ( mm:ss ) Interval ( hh:ss ) Mode Recovery ( mm:ss ) Delay Current Output Output A Source...

  • Page 57: Appendix C - Redox Solutions

    For calibration and test purposes, standard solutions at various potentials can be purchased. LTH Electronics offers 2 standard solutions: Part No. 138/175 124mv Redox solution, 500ml. Part No. 138/176 358mv Redox solution, 500ml. 18.2 Sensor Test Calibration of the HPT63 in the Redox mode is a single point calibration only.
  • Page 58 18 Appendix C – Redox Solutions...

  • Page 59: Appendix D - Buffer Solutions

    19 Appendix D – Buffer Solutions 19 Appendix D – Buffer Solutions The following table gives the LTH buffer solution values. Prepare and use buffer solutions in accordance with the instructions supplied with them. pH variation against temperature Temperature (°C) 4 pH Buffer 7 pH Buffer 9 pH Buffer...

  • Page 60: Appendix E - Temperature Sensor Data

    20 Appendix E – Temperature Sensor Data 20 Appendix E – Temperature Sensor Data The table below lists approximate resistance values of temperature sensors that may be used with the HXT63 series. Not all options are available on all models. Temperature PT1000 ( °C )

  • Page 61: Appendix F - Error Messages

    21 Appendix F – Error Messages 21 Appendix F – Error Messages Switch On Diagnostic Errors Processor RAM Read/Write Error Try switching the unit off then on again. If the message persists, consult with your supplier, as this unit will require to be returned for repair.
  • Page 62 21 Appendix F – Error Messages Min Temp Cal Factory temperature zero calibration value at zero. Temperature sensors require recalibration. Contact LTH or agent. Max Temp Cal Factory temperature span calibration value at maximum. Temperature sensors require recalibration. Contact LTH or agent. >...
  • Page 63 21 Appendix F – Error Messages Temperature Sensor Fault The temperature sensor is reading open or closed circuit, due in most cases to a damaged sensing element or incorrect wiring. Check Configuration menu Temperature Sensor is set to the correct type. Under this condition, the unit will default to the fixed temperature setting for compensation purposes.
  • Page 64 21 Appendix F – Error Messages Floating Point Maths Errors These errors are only flagged when an internal maths calculation fails. As such, they should not appear if the software is functioning properly. The error message should time out after approx. 5 seconds. If the error continues to be displayed, call LTH or an authorised distributor for advice.
  • Page 65 Index Access Display............17 Code ............22 Dose alarm ..........29 Entry............22 Electrode type ..........24 Levels ............. 22 EMC............. ii Alarm............29 EMI...............8 Averaging ........... 40 Error............31 Bargraph ..........21, 40 Error message .....20, 21, 40, 43, 57 Bell Symbol..........20 Fault Finding..........43 Buffer ............
  • Page 66 Index Proportional band ......... 28, 29 Relay............26 Proportional control........31 Source .............27 Quality............ii TP Mode ..........28 Ranges ............5 Trigger ............27 Recovery ............ 41 Slope ............33 Redox Offset ..........34 Software version .........42 Relay ............26 Standards ............. ii Relay connections ........16 Supply Voltage Relays Specification ..........6...
  • Page 67 3 Depending on unit settings, some menu items may Key: not appear. (See the appropriate sections in the main text.) Universal access SP2 source 4. N/A = not applicable Level 1 access Etc, as SP1 Level 2 access HPT63...
  • Page 68 LTH Electronics Ltd Chaul End Lane Luton Bedfordshire LU4 8EZ United Kingdom Telephone : +44 (0) 1582 593693 Fax : +44 (0) 1582 598036 e-mail : sales@lth.co.uk web : www.lth.co.uk...

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