LTH Electronics HPT63 User manual

HPT63
pH / REDOX TRANSMITTER
OPERATION GUIDE

Preface
i
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’ without warranty.
Limitation of warranty
The foregoing warranty does not cover damage caused by accidental misuse, abuse,
neglect, misapplication or modification.
No warranty of fitness for a particular purpose is offered. The user assumes the
entire risk of using the product. Any liability of LTH is limited exclusively to the
replacement of defective materials or workmanship.
There are no user serviceable parts, including fuses etc., within the unit. Any attempt
to dismantle the instrument will invalidate the warranty.
Disclaimer
LTH Electronics Ltd reserves the right to make changes to this manual or the
instrument without notice, as part of our policy of continued developments and
improvements.
All care has been taken to ensure accuracy of information contained in this manual.
However, we cannot accept responsibility for any errors or damages resulting from
errors or inaccuracies of information herein.
Copyright and trademarks
All rights reserved. Translations, reprinting or copying by any means of this manual,
complete or in part or in any different form requires our explicit approval.
HPT63 is a trademark of LTH Electronics Ltd
Second edition: January 2005
Document part number: 6146
LTH Electronics Ltd
Chaul End Lane
Luton Telephone [phone]
Bedfordshire Fax [phone]
LU4 8EZ Email [email protected]
United Kingdom Web www.lth.co.uk

Preface
ii
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. Certificate No : FM13843
Note: The standards referred to in the design and construction of LTH products are
those prevailing at the time of product launch. As the standards are altered
from time to time, we reserve the right to include design modifications that are
deemed necessary to comply with the new or revised regulations.

Contents
iii
CONTENTS
1Introduction ................................................................................................ 1
1.1 About the HPT63 ................................................................................. 1
1.2 Unit Specification ................................................................................. 1
2Safety & EMC............................................................................................. 3
2.1 Wiring Installation................................................................................. 3
2.2 Noise suppression................................................................................ 3
3Installation.................................................................................................. 5
3.1 Head-mounted Version Mechanics ...................................................... 5
3.2 Wall-mounted Version Mechanics........................................................ 7
3.3 Dip Tube Assembly.............................................................................. 8
3.4 Connections ......................................................................................... 9
3.5 Digital Inputs ...................................................................................... 12
4User Interface .......................................................................................... 13
4.1 The Front Panel ................................................................................. 13
4.2 The Menu System.............................................................................. 14
4.3 Unit Configuration .............................................................................. 15
4.4 Number entry ..................................................................................... 16
4.5 Error Messages.................................................................................. 16
5Main Display............................................................................................. 17
6Menu Access ........................................................................................... 18
6.1 Changing the Access Code................................................................ 18
7Parameters .............................................................................................. 19
7.1 Units................................................................................................... 19
7.2 Electrode Type................................................................................... 20
7.3 Temperature Input ............................................................................. 20
7.4 Simulated Input .................................................................................. 21
8Set Point Relays....................................................................................... 22
8.1 Set Point Source ................................................................................ 23
8.2 Set Point Trigger ................................................................................ 23
8.3 Set Point Mode .................................................................................. 24
8.4 Dose Alarm Timers ............................................................................ 25
8.5 Alarms................................................................................................ 25
8.6 Cleaning............................................................................................. 25
9Current Output ......................................................................................... 26
9.1 Input................................................................................................... 26
9.2 Select Output ..................................................................................... 26
9.3 Zero & Span....................................................................................... 26
9.4 Proportional Control ........................................................................... 27
9.5 Error Condition................................................................................... 27
10 Calibration................................................................................................ 28

Contents
iv
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
11 Save/Restore ........................................................................................... 33
12 Configuration............................................................................................ 35
12.1 Language ........................................................................................... 36
12.2 Temperature Input Sensor.................................................................. 36
12.3 Error Messages .................................................................................. 36
12.4 Input Filtering (Averaging) .................................................................. 36
12.5 Bargraph............................................................................................. 36
12.6 Software Version ................................................................................ 36
13 Cleaning Menu ......................................................................................... 37
14 Fault Finding ............................................................................................ 39
14.1 Problems With Cables and Connectors.............................................. 41
15 Guarantee and Service ............................................................................ 43
16 Appendix A – Factory Default Setups ...................................................... 45
17 Appendix B – Customer Setup ................................................................. 47
18 Appendix C – Redox Solutions................................................................. 49
18.1 Standard Solutions ............................................................................. 49
18.2 Sensor Test ........................................................................................ 49
19 Appendix D – Buffer Solutions ................................................................. 51
20 Appendix E – Temperature Sensor Data ................................................. 52
21 Appendix F – Error Messages.................................................................. 53

Glossary
iii
GLOSSARY
LCD Liquid crystal display
LED Light Emitting Diode
LSB Least Significant Bit
MSB Most Significant Bit
ppm Parts per million.
ppt Parts per thousand
PRT Platinum Resistance Thermometer.
PSD Programmable System Devices.
Redox Reduction/oxidation. Chemical reaction involving oxidation and
reduction.
RTD Resistive Temperature Device
SP Set point.

Contents
iv

1 Introduction
1
1 Introduction
1.1 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.
1.2 Unit Specification
Measurement input Single ended or differential with solution ground.
pH
Separate glass and reference electrode pair. Separate
Antimony and reference electrode pair or combination electrode
Redox
Separate metal and reference electrode pair or combination
electrode.
Other manufacturers’ sensors can be accommodated.
Ranges of measurement 0.00 to 14.00pH
-1999mV to +1999mV
-50°C to +300°C
Accuracy ±0.05pH
±3mV
Linearity ±0.1% of range
Repeatability ±0.1% of range
Operator adjustment
pH
Antimony
Redox
Slope
60-120%
60-120%
NA
Offset
3 to 11 pH
-4 to +4 pH
-400 mV to +400 mV
Temperature sensor PT1000 RTD or 3K Balco thermistor.
Temperature accuracy ±0.2°C
Operator adjustment (Temp) ±50°C, or ±122°F
Temperature compensation type Automatic or manual 0°C to 100°C
Off-Line Facility
( for calibration and
commissioning )
The relays are de-energised and the current output is held at
the last on-line value. Can be initiated remotely by a contact
closure.
Ambient Operating Temperature -20°C to +50°C (-4°F to +122°F) for full specification.
Ambient temperature variation ±0.01% of range / °C ( typical )
Display Custom back-lit LCD module. 4 character (& sign) 7 segment
(20mm high) for measured value, 2x3 dot matrix for units
indication, and 1x16 dot matrix for information and
programming.

1 Introduction
2
Current output
( optional 1 or 2 outputs )
Each selectable 0-20 mA or 4-20 mA into 1500 Ohms max.,
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
( Advanced model only )
Fully configurable set points (pH, mV, °C) with volt free contacts
for both relays. Rated at 5A 30V DC / 5A 250VAC (non-
inductive). Red LEDs indicate relay energised.
Operating modes
( Control, All relays )
On/Off, Time Proportioning, Pulse Proportioning, Band and
Clean modes selectable for each relay.
Adjustable delay timers up to 10:00 mm:ss and hysteresis in the
On/Off mode.
Adjustable dose alarm timer up to 15:00 mm:ss in all modes.
Adjustable cycle time and proportional band in the proportional
modes.
Adjustable duration, recovery and interval periods in the clean
mode.
Operating modes The relay can be set to energise on any of the following
instrument conditions:-
Sensor alarm, Dose alarm, Calibration, Off line, Any error
Switches Four tactile feedback push buttons
EMC : Immunity BS EN 50082-2 1995
EMC : Emissions BS EN 50081-1 1992
Safety Designed and manufactured in accordance with BS EN 61010-1
1993
Power Supply 15 to 30V AC or DC at 200 mA
Head Mount Housing Conductive ABS blue plastic, rated IP66
Weight 600g (instrument only)
Dimensions 110mm high x 116mm wide x 145mm deep,
excluding connectors