LTH Electronics MXD75 User manual

MXD75
Multi-parameter Monitor
Installation Guide

Preface
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Preface
Product warranty
The MXD75 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.
MXD75 is a trademark of LTH Electronics Ltd
Third edition: June 2013
LTH Electronics Ltd
Chaul End Lane
Luton Telephone : [phone]
Bedfordshire Fax : [phone]
LU4 8EZ email : [email protected]
England Web : www.lth.co.uk

Preface
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Manufacturing Standards
Electromagnetic compatibility
This instrument has been designed to comply with the standards and regulations set down
by the European EMC Directive 2004/108/EC 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 2006/95/EC using BS EN 61010-1: 2010
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 2002/96/EC, please observe the applicable local or national regulations
concerning the disposal of waste electrical and electronic equipment.

Preface
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Declaration of Conformity

Preface
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Contents
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Contents
Preface.........................................................................................................................1
Contents .....................................................................................................................5
Introduction..............................................................................................................7
MXD75 Instrument Specification......................................................................9
Installation – Safety & EMC............................................................................... 11
Noise suppression................................................................................................ 12
MXD75 Add-in Cards Installation................................................................... 13
Installation – MXD75........................................................................................... 19
Pipe Mounting ...................................................................................................... 20
MXD75 Basic Connections................................................................................ 23
Supply Voltage Connections..................................................................... 24
Sensor Connections...................................................................................... 24
Current Output Connections..................................................................... 25
Relay Connections......................................................................................... 26
Digital Inputs ................................................................................................... 27
SD Card Interface ........................................................................................... 28
Guarantee and Service....................................................................................... 29
Index ......................................................................................................................... 32

Contents
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Introduction
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Introduction
Introduction
The MXD75 is a microprocessor controlled multi-parameter instrument that can be
installed with a user selected combination of up to 3 Sensor Input Cards. The instrument
may be subsequently modified to meet changing requirements by the installation of
additional, or different, cards and the attachment of the appropriate sensor(s).
Utilising a multifunction easy to read QVGA LCD the instrument displays readings and
provides feedback to the operator on the status of the sensors and instruments outputs.
In addition the instrument features, depending upon configuration, up to six control relays
and up to six 0/4 – 20mA current outputs. These can be used to provide fully configurable
control, alarm and feedback.
Finally the instrument also features an SD card interface which enables the user to backup
and restore instrument settings, copy settings between instruments, log the sensor
readings (optional extra) and to upgrade the instrument’s software.
MXD75 Overview

Introduction
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Introduction
MXD75 Termination Overview

Introduction
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Introduction
MXD75 Instrument Specification
Input Expansion Slots 3 slots, user configurable with any combination of
available input add-in cards.
Output Expansion Slots 1 slot, user configurable with an additional output
option add-in card.
Ambient Operating Temperature -20°C to +50°C (-4°F to +122°F) for full specification.
Display 3 ¾” QVGA back lit LCD module.
Buttons 5 tactile feedback, micro-switched, silicone rubber.
Alarm LED’s 2 Yellow LED’s located above the main display area
for instrument’s alarm status, lit = active.
Digital Inputs 8 contact closures for remote activation of user
defined operations. Can be configured to operate in
either normally open or normally closed modes.
Current Output Options 1 as standard, expandable up to a total of 4 or 6
depending on the number of relays.
Current Output Specification Each 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
Options
2 change over relays as standard, expandable up to
a total of either 4 change over relays, or 4 change
over relays + 2 normally open relays depending on
the number of current outputs.
Setpoints and Control Relays
Specification
Fully configurable setpoints with volt free contacts
for each relay. Rated at 5A @ 30V DC / 5A @ 250V AC.
Setpoint LED’s 6 Red LED’s located above main display area for
setpoint status indication, lit = relay energised.

Introduction
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Introduction
Setpoint Modes On/Off, Time Proportioning, Pulse Proportioning,
Band and Latch.
Delay timer adjustable from 00:00 to 59:59 mm:ss.
Hysteresis 0 to 9.9%.
Dose alarm timer, with supplementary initial charge
function. Both adjustable from 00:00 to 59:59 mm:ss.
Adjustable cycle time and proportional band in
proportional modes.
Setpoint Cleaning Cleaning mode with adjustable duration (max 10m)
and interval times (max 24h), auto offline function
with recovery timer.
Setpoint Alarm Unit or channel alarm mode, whereby the relay can
be energised under certain set conditions.
SD Card Interface Enables backing up and restoring of instrument
configuration, log the sensor readings (optional
extra) and on site upgrading of instrument software.
SD, SDHC and SDXC-FAT32 cards supported.
EMC 2004/108/EC using BS EN 61326-1: 2013.
Low Voltage Directive 2006/95/EC using BS EN 61010-1: 2010.
Power Supply Universal 80-265V AC or DC, 15W max.
LV Option 18 – 32 V AC or DC, 20W max.
Instrument Housing UL 94-V0 PC/ABS.
Ingress Protection Rating
(IEC 60529 Protection Rating)
IP66.
Weight Maximum 2.7 kilograms (instrument only).
Dimensions 331 x 242 x 110 mm (H, W, D) excluding mounting
brackets.

Installation
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Installation
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.
The terminal cover of the surface mount unit must be correctly re-assembled and
securely fastened to maintain a continuous electro-magnetic shield around the instrument.
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.

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Installation
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.
In cases of very high background RF and HF noise environments, LTH can supply a
length of proprietary RF suppressing mains cable.

Installation
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Installation
MXD75 Add-in Cards Installation
The MXD75 is designed to be expandable by the use of add-in cards; these add-in cards can
take the form of either a sensor input add-in card or an output option add-in card. The
MXD75 can be fitted with up to 3 sensor input cards and 1 output option card. The sensor
input cards are designated Input Card 1, Input Card 2 and Input Card 3. On the instrument
display these are designated Channel 1, Channel 2 and Channel 3.
LElectrostatic precautions must be taken when handling the Add-in cards.
Input cards 1 & 2 are installed via the use of headers A and B (supplied with instrument).
Header A Header B
Insert the required input cards between the headers as shown in the following two
diagrams, ensuring that the connectors are correctly aligned with the headers on the input
cards.
Input Card 1 & 2 Installation Side View

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Installation
Input Card 1 & 2 Installation
Top View
Input card 3 and the output option card are installed via the use of header C and either
header D or E depending on the configuration of the output option card. (N.B. header’s C, D
and E are not supplied with the standard instrument and must be purchased separately if
upgrading the unit after initial purchase).
Header C Header D Header E
Insert the required input card or output option card between the headers as shown in the
following two diagrams, ensuring that the connectors are correctly aligned with the
headers on the cards.
Input Card 3 & Output Option Card Installation Side View

Installation
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Installation
Input Card 3 & Output Option
Card Installation Top View
To install the cards and headers into the instrument, first remove the terminal cover.
Then remove the two revealed screws at the bottom of the case.

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Installation
Then on the underside of the case remove the remaining seven screws. N.B. Do not lose the
o-rings which may come off when removing the screws.
The headers with the cards attached must then be inserted into the instrument’s main
board connectors. Match the header’s name with corresponding text on the board, as
shown in the following figure. Care must be taken to align the header board with the
dotted outline on the main board.

Installation
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Installation
Once inserted the instrument should look as follows
With Input Card 1 and 2 With Input Card 1, 2, 3 and
Output Option Card
Now attach the supplied connection labels to the terminal area label and inside the
terminal cover as shown.
Supplied Terminal Label Locations

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Installation
Supplied Terminal Cover Label Locations
Next reassemble the instrument case, ensuring all of the o-rings are in place on the back of
the case and all of the screws are re-inserted. Connect the power (see Supply Voltage
Connections section) and check that all of the new cards have been recognised by the
instrument.
Now consult the appropriate wiring section for details of how to connect the sensors and
outputs.