LTH Electronics BPD17 User manual

BPD17
pH / Redox Monitor
Operation Guide

Preface
BPD17 pH / Redox Monitor
Operating Guide - 1 -
Preface
Product warranty
The BPD17 pH / Redox Monitor 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.
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.
BPD17 is a trademark of LTH Electronics Ltd
Second edition: May 2018
LTH Electronics Ltd
Chaul End Lane
Luton Telephone : [phone]
Bedfordshire Fax : [phone]
LU4 8EZ Email : [email protected]
England Web : www.lth.co.uk

Preface
- 2 - BPD17 pH / Redox Monitor
Operating Guide
Manufacturing Standards
Electromagnetic compatibility
This instrument has been designed to comply with the standards and regulations set down
by the European EMC Directive 2014/30/EU using BS EN 61326-1: 2013
Safety
This instrument has been designed to comply with the standards and regulations set down
by the European Low Voltage Directive 2014/35/EU using BS EN 61010-1: 2010
Restriction of Hazardous Substances
This instrument has been produced to comply with the standards and regulations set down
by the European Restriction of Hazardous Substances Directive 2011/65/EU using BS EN
50581: 2012
Quality
This instrument has been manufactured under the following quality standard:
ISO 9001:2008. Certificate No: FM 13843
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.
Disposal
As per directive 2012/19/EU, please observe the applicable local or national regulations
concerning the disposal of waste electrical and electronic equipment.

Preface
BPD17 pH / Redox Monitor
Operating Guide - 3 -
Declaration of Conformity

Preface
- 4 - BPD17 pH / Redox Monitor
Operating Guide
Blank

Contents
BPD17 pH / Redox Monitor
Operating Guide - 5 -
Contents
Preface....................................................................................................................................1
Contents ................................................................................................................................5
Introduction .........................................................................................................................7
pH / Redox (ORP) Input Specification .........................................................................8
Installation – Safety & EMC .......................................................................................... 11
Noise suppression........................................................................................................... 12
Enclosure ............................................................................................................................ 13
Surface-Mounting..................................................................................................... 14
Panel-Mounting......................................................................................................... 15
Pipe-Mounting........................................................................................................... 16
Terminal Operation.................................................................................................. 17
Supply Voltage Connections ................................................................................ 17
Relay Connections.................................................................................................... 18
Current Output Connections................................................................................ 18
Digital Inputs .............................................................................................................. 19
MicroSD Card Interface........................................................................................... 19
Installation and Choice of pH / Redox Electrodes ............................................... 20
Care and Maintenance of pH / Redox Electrodes.......................................... 20
BPD17 pH / Redox Input Connection Details ................................................. 22
Temperature Sensor Connections...................................................................... 25
Extension Cable Connections............................................................................... 26
User Interface.................................................................................................................... 27
The Front Screen....................................................................................................... 27
Security Code Access............................................................................................... 28
pH / Redox (ORP) Input Setup..................................................................................... 29
Channel Menu............................................................................................................ 29
Units............................................................................................................................... 29
Temperature Compensation mode ................................................................... 30
Input Filtering (Averaging).................................................................................... 31
Calibration.......................................................................................................................... 32
Calibration Menu ...................................................................................................... 34
Sensor Condition ...................................................................................................... 37

Contents
- 6 - BPD17 pH / Redox Monitor
Operating Guide
Front Screen Calibration Access.......................................................................... 38
Calibration Reminder .............................................................................................. 38
Custom Buffer Entry................................................................................................. 39
Auto pH Sensor Calibration................................................................................... 41
Manual pH Sensor Calibration ............................................................................. 43
Buffer Solutions ......................................................................................................... 44
Setpoints............................................................................................................................. 45
Trigger........................................................................................................................... 45
Hysteresis..................................................................................................................... 48
Setpoint Dose Alarm................................................................................................ 49
Setpoint Cleaning Mode ........................................................................................ 51
0/4-20mA Output ............................................................................................................ 53
Output Mode.............................................................................................................. 53
On Error ........................................................................................................................ 54
Calibration................................................................................................................... 54
Digital Inputs..................................................................................................................... 56
Polarity.......................................................................................................................... 57
Configuration.................................................................................................................... 58
Main Menu .................................................................................................................. 58
Unit Flash On Error ................................................................................................... 59
Set Display Contrast................................................................................................. 59
Software Version ....................................................................................................... 59
Serial Number ............................................................................................................ 60
Contact Information ................................................................................................ 60
Update Software.............................................................................................................. 61
Save, Restore & Reset ..................................................................................................... 62
Service ................................................................................................................................. 64
Service Alarm.............................................................................................................. 64
Appendix A - Temperature Data................................................................................ 65
Appendix B - Error Messages....................................................................................... 66
Fault Finding ..................................................................................................................... 68
Problems with Cables and Connectors............................................................. 69
Guarantee and Service .................................................................................................. 70

Introduction
BPD17 pH / Redox Monitor
Operating Guide - 7 -
Introduction
The BPD17 is a microprocessor controlled pH and Redox (ORP) measurement instrument
that can be used with a wide range of Single ended or differential electrodes to measure
and control a broad spectrum of solution pH or Redox. To achieve this, the instrument
utilises a multifunction LCD to display the primary reading and temperature, show
operational status and to provide an intuitive user interface.
As standard the instrument is a simple to install IP66 rated Wall-mount instrument,
however with the addition of a suitable mounting kit it can either be installed as a Panel-
mount or Pipe-mount instrument.
The instrument has two on-board volt-free normally-open relays with adjustable setpoint
value and hysteresis. Either one can be set to activate if the process variable is above or
below the setpoint allowing the instrument to be used in a variety of dosing or control
applications. Additional setpoint functions include delayed activation, dose alarm timer
and scheduled cleaning, whilst the status of the relays can be seen via the main screen of
the instrument.
Additionally, the instrument features one industry standard, isolated, 0/4-20mA current
output that features adjustable scaling, selectable on-error states and loop fault detection,
allowing the instrument to transmit the primary reading for remote monitoring purposes.
Also fitted are two contact inputs which allow the instrument to be remotely set to an
offline state that forces the relays to deactivate and the current output to a pre-defined
state.
Depending upon version purchased the instrument is powered by either 85-265V AC or 12-
30V DC.

Specification
- 8 - BPD17 pH / Redox Monitor
Operating Guide
pH / Redox (ORP) Input Specification
Measurement Input Single ended or differential with solution ground.
pH
Separate glass and reference electrode pair.
Combination electrode.
Redox (ORP)
Separate glass and reference electrode pair.
Combination electrode.
Other manufacturer’s sensors can be accommodated.
Connection Cable Up to 30 meters (no preamp required)
LTH type 54E or LN10 cable
Ranges of Measurement 0.00 to 14.00 pH
-1999mV to +1999mV.
Accuracy ± 0.05 pH.
± 3mV.
Linearity ± 0.1% of range.
Repeatability ± 0.1% of range.
Operator Adjustment
Slope Offset
pH 60-120% 3 to 11pH
Redox
NA -400mV to +400mV
Calibration Methods Automatic 4pH / 9pH Buffer Calibration, Alternative buffers
supported by user entry into instrument.
Manual Slope and Offset Adjustment.
Both methods feature post-calibration electrode
condition indication
Custom Buffer
13 point 4pH / 9pH custom buffer entry pre-loaded with
standard LTH buffers, alternative buffers also supported by
user entry into instrument.
Sensor Input Filter
Adjustable filter that averages the sensor input over a
user selectable time (10sec – 5mins).
Temperature Sensor Pt1000 or PT100 RTD input. Up to 30 meters of cable.
Temperature sensor can be mounted in the sensor or
separately.
Range of Temperature
Measurement
-50 °C to +150 °C (-58 °F to +302 °F) for full specification.
Temperature Accuracy ± 0.5 °C (when using PT1000)

Specification
BPD17 pH / Redox Monitor
Operating Guide - 9 -
Operator Adjustment
(Temperature)
± 50 °C or ± 122 °F
Range of Temperature
Compensation
-10 °C to +150 °C (+14 °F to +302 °F) for full specification.
Temperature Compensation Type Automatic or manual -10 °C to +150 °C
Off-Line Facility The relays are de-energised and the current output is held at
a user defined level.
Ambient Operating Conditions Temperature -20 to +55°C, Relative Humidity 5 to 95%, non-
condensing.
Ambient Temperature Variation ±0.01% of range / °C (typical)
Display 3¾“ 240x128 dot LCD Module
Display Backlight Can be set to flash to indicate the instruments alarm status.
Buttons 5 tactile feedback micro-switched, silicone rubber
Digital Inputs 2 contact inputs for remote activation of user defined
operations. Can be configured to operate in either normally
open or normally closed modes.
Current Output Specification Single current output, selectable 0-20mA or 4-20mA into
750 ohms max, fully isolated to 2kV. Expandable up to 5% of
any operating range and offset anywhere in that range.
Current Output Adjustment ±0.01mA, 3 point 0/4-20 mA for remote monitor calibration.
Setpoints and Control Relays
Specification
2 normally open fully configurable setpoints with volt free
contacts for each relay. Rated at 5A @ 30V DC / 5A @ 250V
AC.
Setpoint Modes High, Low, Band, Cleaning
Delay timer adjustable from 00:00 to 59:59 mm:ss.
Hysteresis 0 to 9.99%.
Dose alarm timer, with supplementary initial charge
function. Both adjustable from 00:00 to 59:59 mm:ss.
Cleaning to operate a jet spray wash or rotary electrode
cleaning system on a timed cycle. Adjustable Duration,
Interval and Recovery.
MicroSD Card Interface Enables on site upgrading of instrument software. SD, SDHC
and SDXC-FAT32 cards supported.
EMC 2014/30/EU using BS EN 61326-1: 2013.
Low Voltage Directive 2014/35/EU using BS EN 61010-1: 2010.
Power Supply Universal 90-265V AC, 9W max.
LV Option 12 – 30 V DC, 4W max.

Specification
- 10 - BPD17 pH / Redox Monitor
Operating Guide
Instrument Housing UL 94-V0 PC/ABS.
Ingress Protection Rating
(IEC 60529 Protection Rating)
IP66.
Weight Maximum 800 grams (instrument only).
Dimensions 175 x 150 x 119 mm (H, W, D).

Installation
BPD17 pH / Redox Monitor
Operating Guide - 11 -
Installation – Safety & EMC
This chapter describes how to install the instrument 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.
Wiring Installation
The specified performance of the instrument 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.
CAUTION ! : 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.
LOCAL WIRING AND SAFETY REGULATIONS SHOULD BE STRICTLY ADHERED TO 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.
N.B. 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.

Installation
- 12 - BPD17 pH / Redox Monitor
Operating Guide
Noise suppression
In common with other electronic circuitry, the instrument may be affected by high level,
short duration noise spikes arising from electromagnetic interference (EMI) or radio
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 instrument 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 instrument 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 instrument.

Installation
BPD17 pH / Redox Monitor
Operating Guide - 13 -
Enclosure
The BPD17 as standard is designed to be mounted on a wall or surface via the two holes
located in the rear half of the enclosure. Alternatively, it can be mounted to a panel or a
pipe using optional mounting kits.
BPD17 Overall Dimensions
The enclosure should be opened as following.
Undo four captive
screws as
highlighted
Lift front up and
forward
Rotate front down until hinge
locks under the rear and
front is supported
To close repeat process in reverse, folding the hinge into the rear.

Installation
- 14 - BPD17 pH / Redox Monitor
Operating Guide
Surface-Mounting
LTH recommends using No. 10 x 1¼ inch round head screws or similar for mounting.
Care must be taken when fitting the instrument on uneven walls or surfaces.
Once installed make sure accompanying IP protection plugs are installed over the
mounting holes on the inside rear of the enclosure.


Installation
BPD17 pH / Redox Monitor
Operating Guide - 15 -
Panel-Mounting
138.0mm Square Cut Out
Uses Kit Part Number 6014.
Fit the gasket seal into the grove on the back of the instrument front.
Attach the Mounting Plate to the rear of the case with the supplied screws.
To pass instrument rear through panel cut out remove cable glands.
Use the 4 supplied screw clamps to affix the instrument to the panel.

Installation
- 16 - BPD17 pH / Redox Monitor
Operating Guide
Pipe-Mounting
Fits pipe 50-100mm
Uses Kit Part Number 6024.
Attach the Mounting Plate to the rear of the case with the supplied screws.
Pass supplied mounting straps through plate loops and tighten round pipe as required.
Fit the accompanying IP protection plugs over the internal mounting holes on the inside
rear of the enclosure.

Installation
BPD17 pH / Redox Monitor
Operating Guide - 17 -
Terminal Operation
Whilst pushing terminal lever down using a 3.5mm Slotted Screwdriver, insert wire into
opening and release level to retain.
Supply Voltage Connections
Depending upon version purchased BPD17 can be powered from either 90-265V AC or 12-
30V DC supply voltage. Refer to the label adjacent to the power supply terminals for
the input voltage limits. Exceeding these limits may damage the instrument.
90-265V AC
Power Connections
12-30V DC
Power Connections
The power supply should be taken from an isolated spur and fused to a maximum of 3
Amps. The incoming Earth connection must be connected to the Earth terminal.

Installation
- 18 - BPD17 pH / Redox Monitor
Operating Guide
Relay Connections
The BPD17 is supplied with 2 normally open volt free relays designated 1 & 2, The relay
contacts are connected to the terminals only and are electrically isolated from the
instrument itself. They must be connected in series with a 5 Amp fuse. A contact arc
suppressor may be required to prevent excessive electrical noise, depending upon the
load. To switch more than 5 Amps will require a slave relay.
Relays 1 & 2 Connection Details
Current Output Connections
The BPD17 is supplied with a single current output, which can terminate into a load
resistance not exceeding 750. 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.
Current Output Connection Detail.