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

2 Safety & EMC
3
2 Safety & EMC
This chapter describes how to install and mount the panel-mounting and surface-
mounting versions, and how to connect the unit to a power source and auxiliary
equipment.
Although today’s electronic components are very reliable, it should be anticipated in
any system design that a component could fail and it is therefore desirable to make
sure a system will fail safe. This could include the provision of an additional
monitoring device, depending upon the particular application and any consequences
of an instrument or sensor failure.
2.1 Wiring Installation
The specified performance of the HPT63 is entirely dependent on correct installation.
For this reason, the installer should thoroughly read the following instructions before
attempting to make any electrical connections to the unit.
WARNING! : ALWAYS REMOVE THE MAIN POWER FROM THE SYSTEM
BEFORE ATTEMPTING ANY ALTERATIONS TO THE WIRING. ENSURE THAT
BOTH POWER INPUT LINES ARE ISOLATED. MAKE SURE THAT THE POWER
CANNOT BE SWITCHED ON BY ACCIDENT WHILST THE UNIT IS BEING
CONNECTED. FOR SAFETY REASONS AN EARTH CONNECTION MUST BE
MADE TO THE EARTH TERMINAL OF THIS INSTRUMENT.
ADHERE STRICTLY TO LOCAL WIRING AND SAFETY REGULATIONS WHEN
INSTALLING THIS UNIT. SHOULD THESE REGULATIONS CONFLICT WITH
THE FOLLOWING INSTRUCTIONS, CONTACT LTH ELECTRONICS OR AN
AUTHORISED LOCAL DISTRIBUTOR FOR ADVICE.
To maintain the specified levels of Electro Magnetic Compatibility (EMC,
susceptibility to and emission of electrical noise, transients and radio frequency
signals) it is essential that the types of cables recommended within these instructions
be used. If the installation instructions are followed carefully and precisely, the
instrument will achieve and maintain the levels of EMC protection stated in the
specification. Any equipment to which this unit is connected must also have the
same or similar EMC control to prevent undue interference to the system.
♦ Terminations at the connectors should have any excess wire cut back so that a
minimal amount of wire is left free to radiate electrical pick-up inside or close to
the instrument housing.
Note: The use of CE marked equipment to build a system does not necessarily
mean that the completed system will comply with the European requirements
for EMC.
2.2 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

2 Safety & EMC
4
frequency interference (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
♦ Solenoids
♦ AC power wires, particularly at or above 100V AC
♦ Current carrying cables
♦ Thyristor field exciters
♦ Radio frequency transmissions
♦ Contactors
♦ Motor starters
♦ Business and industrial machines
♦ Power tools
♦ High intensity discharge lights
♦ Silicon control rectifiers that are phase angle fired
The HXT63 series is designed with a high degree of noise rejection built in, to
minimise the potential for interference from these sources, but it is recommended
that you apply the following wiring practices as an added precaution. Cables
transmitting low level signals should not be routed near contactors, motors,
generators, radio transmitters, or wires carrying large currents.
If noise sources are so severe that the instrument’s operation is impaired, or even
halted, the following external modifications should be made, as appropriate:
♦ Fit arc suppressors across active relay or contactor contacts in the vicinity.
♦ Run signal cables inside steel tubing as much as is practical.
♦ Use the internal relays to switch external slave relays or contactors when
switching heavy or reactive loads.
♦ Fit an in-line mains filter close to the power terminals of the supply.
♦ In cases of very high background RF and HF noise environments, LTH can
supply a length of proprietary RF suppressing mains cable.

3 Installation
5
3 Installation
3.1 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.
The two cells are physically similar.
107 mm
112 mm
164.00 mm 164.00 mm
pH Sensor
2082/004
Redox Sensor
2529/004
Figure 1 Head-mounting Installation components

3 Installation
6
Ø63mm
59Ømm
138mm
116mm
273
mm
70mm
116mm
Figure 2 Head-mounting component dimensions

3 Installation
7
3.2 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.
116mm 104mm
140mm
152mm
118mm
73mm
48mm
22mm
Figure 3 Wall-mounted unit dimensions

3 Installation
8
3.3 Dip Tube Assembly
BRACKET ASSEMBLY
6081 - PVC-U ANGLED
(NOT SUPPLIED)
FASTENERS
STAINLESS STEEL
PROBE
HOLDER
TANK WALL
1OO
795 or 1395
PROBE
HOLDER
25O to 6OO or 12OO
REQUIRED 36 TO 38 DIA
116
3O DEG
NYLON COATED
TUBE CLIPS
115O MAX
or
55O MAX
CENTRE HOLE CLEARANCE
FASTENERS
6
ADJUSTABLE BRACKET
1624 - 316 STAINLESS STEEL
Dims in mm
2O DIA
35 DIA
2O DIA
GASKET/SEAL
(NOT SUPPLIED)

3 Installation
9
3.4 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
Pin Function
1 Common 0V
2 24V supply
3 Current A output
4 Current B output (Advanced version only)
5 Not used
6 Not used
7 Earth – Connect to power supply earth pin1 to ensure shielding
of electrical circuits.

3 Installation
10
3.4.2 Connector 2 Digital Range Selection Inputs
Free female socket. Advanced version only.
Pin Function
1 Digital common
2 Not used
3 Not used
4 Digital input 3
5 Digital input 1
6 Digital input 2
7 Not used
3.4.3 Connector 3 Relay Outputs
Free male plug. Advanced version only.
Pin Function
1 Relay 1 common
2 Relay 1 normally open
3 Relay 1 normally closed
4 Relay 2 common
5 Relay 2 normally open
6 Relay 2 normally closed
7 Not used
3.4.4 Connector 4 Sensor Cable Inputs
Free male plug. Wall-mounted version only.
Pin Function
1 Reference
2 No connection
3 Electrode
4 Temperature input A
5 Temperature input B
6 0V Solution Ground
7 Earth
Note: Pins 4 and 5 each have two wires connected.
See table on next page.

3 Installation
11
pH/Redox Connections-to Connector 4
HPT Connector With temperature
element and
solution ground
Without temperature element
Con
4
Pin Function
Optional
54E extn.
cable
pH
electrode
Optional
LN10 extn.
cable
pH
electrode
Redox
electrode
1 Reference * Inner
screen
Black Screen or
black wire
Screen or
black wire
Screen or
black wire
2 N/C
3 Electrode Green core Clear core Clear core Clear core Clear core
4 Temperature
compensation
Yellow wire
& blue wire
Red
5 Temperature
compensation
Black wire &
white wire
Black
6 0V Solution
Ground
Clear core Green
7 Earth Outer screen
*Note: On the extension cable, use the inner screen around the green core as the
Reference connection. The inner screen around the clear core is not used –
cut it back.
3.4.5 Power Supply
The unit requires a supply between 15 and 30V (24V nominal) at 200 mA.
Note: The maximum current output load resistance depends on the unit supply
voltage: Rload (Ohms) = (Vsupply-2) / 0.04
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.
Use a sufficiently large cable to avoid a high resistance in the overall current loop.
3.4.7 Relay Connections
The relay outputs are available only on the Advanced version. The relay contacts are
volt-free (electrically isolated) and can handle up to 5A at 30V DC or 250V AC. They
must be connected in series with a 5 Amp fuse.

3 Installation
12
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
3.5 Digital Inputs
The digital inputs are used to externally initial a cleaning cycle or to take the unit off
line. These inputs are intended to be switched using a volt-free link, switch or relay.
Closing a contact initiates the action.
The connections to connector 2 are as follows:
Ground to pin 6 = clean
Ground to pin 4 = off line.