LTH Electronics BMD17 User manual

BMD17
mA Input Monitor
Operation Guide

Preface
BMD17 mA Input Monitor
Operating Guide - 1 -
Preface
Product warranty
The BMD17 mA Input 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.
BMD17 is a trademark of LTH Electronics Ltd
First edition: September 2021
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 - BMD17 mA Input Monitor
Operating Guide
Manufacturing Standards
Electromagnetic compatibility
This instrument has been designed to comply with the standards and regulations set down
by both the United Kingdom EMC Regulations S.I. 2016/1091 and 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 both the United Kingdom Equipment Safety Regulations S.I. 2016/1101 and 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 both the United Kingdom Equipment Restriction of Hazardous Substances Regulations
S.I. 2012/3032 and the European Restriction of Hazardous Substances Directive 2011/65/EU
using BS EN IEC 63000 : 2018.
Quality
This instrument has been manufactured under the following quality standard:
ISO 9001:2015. 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 regulation S.I. 2012/3032 and directive 2012/19/EU, please observe the applicable
local or national regulations concerning the disposal of waste electrical and electronic
equipment.

Preface
BMD17 mA Input Monitor
Operating Guide - 3 -
Declaration of Conformity

Preface
- 4 - BMD17 mA Input Monitor
Operating Guide

Contents
BMD17 mA Input Monitor
Operating Guide - 5 -
Contents
Preface.........................................................................................................................1
Contents.....................................................................................................................5
Introduction..............................................................................................................7
mA 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.............................................................................................................. 20
BMD17 mA Input Connection Details.................................................... 21
User Interface......................................................................................................... 24
The Front Screen............................................................................................ 24
Security Code Access.................................................................................... 26
mA Input Setup..................................................................................................... 27
Channel Menu................................................................................................. 27
Input Mode....................................................................................................... 27
Units.................................................................................................................... 28
Setup Curve A or B........................................................................................ 29
Input Filtering (Averaging)......................................................................... 30
Calibration .............................................................................................................. 31
Calibration Menu ........................................................................................... 31
Front Screen Calibration Access............................................................... 34

Contents
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Operating Guide
Calibration Reminder ................................................................................... 34
Setpoints ................................................................................................................. 36
Trigger................................................................................................................ 36
Hysteresis.......................................................................................................... 41
Setpoint Dose Alarm..................................................................................... 42
Setpoint Cleaning Mode ............................................................................. 44
Setpoint Proportional Mode...................................................................... 46
0/4-20mA Output................................................................................................. 48
Output Mode................................................................................................... 48
On Error.............................................................................................................. 49
Calibration ........................................................................................................ 50
Digital Inputs ......................................................................................................... 52
Polarity............................................................................................................... 53
Configuration ........................................................................................................ 54
Main Menu........................................................................................................ 54
Unit Flash On Error ........................................................................................ 55
Set Display Contrast...................................................................................... 55
Software Version............................................................................................ 55
Serial Number.................................................................................................. 56
Contact Information ..................................................................................... 56
Update Software .................................................................................................. 57
Save, Restore & Reset.......................................................................................... 58
Service...................................................................................................................... 60
Service Alarm................................................................................................... 60
Appendix A - Error Messages......................................................................... 61
Fault Finding.......................................................................................................... 64
Guarantee and Service....................................................................................... 65

Introduction
BMD17 mA Input Monitor
Operating Guide - 7 -
Introduction
The BMD17 is a microprocessor-controlled mA Input measurement instrument that can be
used with a variety of loop powered and self-powered current output transmitters. To
achieve this, the instrument utilises a multifunction LCD to display the primary reading and
raw mA Input, 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 bleeding
applications. Other setpoint functions include activation on alarm, time and pulse
proportion, 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 up to two industry standard, isolated, 0/4-20mA
current outputs that features adjustable scaling, selectable on-error states and loop fault
detection. Either allows the instrument to transmit the primary reading for remote
monitoring purposes.
Also fitted is a single contact input which allows the instrument to be remotely set to either
an offline state that forces the relays to deactivate and the current output to a pre-defined
state, or to change the whole configuration of the instrument by switching the setup to a
preconfigured state.
Depending upon version purchased the instrument is powered by either 85-265V AC or 12-
30V DC.

Specification
- 8 - BMD17 mA Input Monitor
Operating Guide
mA Input Specification
Measurement Input 0 to 24mA input, fully isolated from instrument supply.
Loop Modes mA Input – Standard mA input from transmitter, 100 input
impedance, max loop voltage 35V.
Loop Powered – The BMD17 will supply 24V to power the
current loop.
3 Wire – The BMD17 can supply an alternative 24V 30mA
Max output via the “24v PWR” pin to power a 3 wire
transmitter.
Input Mode 0 – 20 mA (Linear)
4 – 20 mA (Linear)
2 Custom Curves (Non-Linear)
Display Ranges ± X.XXX
± XX.XX
± XXX.X
± XXXX
Custom Units
Maximum of 5 Alphanumeric Characters.
Connection Cable Up to 30 meters.
Error States Input under 4mA (when using 4-20mA Input)
Input over 20mA
Accuracy ±0.1% of reading.
Linearity ± 0.1% of range.
Repeatability ± 0.1% of range.
Calibration Methods Reading Offset Calibration.
Automatic 2 Point 0/4mA and 20mA Calibration.
Calibration Reminder Inbuilt calibration count down timer which will trigger an
alarm when calibration interval has expired.
Sensor Input filter Adjustable filter that averages the sensor input over a user
selectable time (10sec – 5mins).
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)

Specification
BMD17 mA Input Monitor
Operating Guide - 9 -
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 Input Single contact input for remote activation of user defined
operations. Can be configured to operate in either normally
open or normally closed modes.
Current Outputs Specification Single current output as standard with option of two on
advance models, 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 Outputs Adjustment ±0.01mA, 2 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, Latch High, Latch Low, Cleaning, Alarm
On/Off, Time Proportioning, Pulse Proportioning.
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.
Adjustable cycle time and proportional band in
proportional modes.
Cleaning to operate a jet spray wash or rotary electrode
cleaning system on a timed cycle. Adjustable Duration,
Interval and Recovery.
Flash backlight on setpoint trigger.
MicroSD Card Interface Enables on site upgrading of instrument software. SD, SDHC
and SDXC-FAT32 cards supported.
EMC S.I. 2016/1091 & 2014/30/EU using BS EN 61326-1: 2013.
Safety / Low Voltage Directive S.I. 2016/1101 & 2014/35/EU using BS EN 61010-1: 2010.
Power Supply Universal 90-265V AC, 10W max.
LV Option 12 – 30 V DC, 6W max.
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).

Specification
- 10 - BMD17 mA Input Monitor
Operating Guide
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Installation
BMD17 mA Input 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 - BMD17 mA Input 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
BMD17 mA Input Monitor
Operating Guide - 13 -
Enclosure
The BMD17 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.
BMD17 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 - BMD17 mA Input 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
BMD17 mA Input 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 - BMD17 mA Input 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
BMD17 mA Input 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 BMD17 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 - BMD17 mA Input Monitor
Operating Guide
Relay Connections
The BMD17 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 BMD17 is supplied as standard with a single current output or as an option with two,
either can terminate into a load resistance not exceeding 750and are both galvanically
isolated from the rest of the instrument. 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.
Basic Instrument Current
Output Connection Detail
Advanced Instrument Current
Output Connection Detail

Installation
BMD17 mA Input Monitor
Operating Guide - 19 -
Digital Inputs
The BMD17 features a single digital input, which can be used to initiate a user configurable
instrument operation by use of a volt free link, switch or relay. The instrument can be
configured to initiate the appropriate action when the contact either closes or opens.
Current Output Connection Detail.
MicroSD Card Interface
The BMD17 features a MicroSD card interface which is compatible with SD, SDHC and SDXC
formatted cards (N.B. SDXC cards may need formatted to Fat32 before use). Its primary
function is to enable the upgrading of the instruments operating software
To insert the card, ensure that the side notch is on the right-hand side of the card, and then
just push it all the way in to the socket. To remove the card push it in then release and the
card should then come out of the socket. N.B. It may be required to pull the card out of the
last bit of the socket.