London Electronics INT2-P-DIFF User manual

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Document Ref:pm65\manuals\INT2_P_Diff Revision:20 Dated: 28 February 2011
Software version F00.21
Panel mounting process indicator / controller
INT2-P-DIFF 2x 4-20mA
Connection details, scaling and general information
The New version of the INTUITIVE Family, with these extra benefits...
* 20 bit A/D convertor, higher precision, improved stability.
* 16 bit D/A convertor, greater resolution.
* Direct and theoretical linearisation features
* More comms options, for faster, more flexible data access.
* Extra ‘Factor and Offset’ feature, allows you to correct for Gravity, Container Tare etc.
* Timers on alarm relays.
* More alarm setting modes, including in-band and out of band alarms, pump control.
* Summary Screen, lets you know which options are fitted, whenever you want to know.
* Wider operating temperature range
* Variable brightness feature, plus Daylight viewing option for use in direct sunlight
*Adjustable menu timeout delay, to suit new and experienced users.
* Choice of Basic or Advanced menu in standard model
* Outputs selectable from nett or gross.
* Real -Time clock option
* DIN Rail mounting option
Ordering code: INT2-P-DIFF-X-X-X-X-X-X
INT2 = Intuitive Mark 2 family
P-DIFF = Process model, differential
Analogue output: 0=none, ANB=-10to+10V, ANI=4-20mA, ANV=0-10V
Alarm outputs: 0=none, AL2= 2 relays, AL4=4 relays
Serial data: 0= none, 232=RS232, 485=RS485
Display colour: R=Red, G=Green
Power: AC=100-240V AC, DC=11-30V DC
Mounting: 0= Standard panel DIN = DIN rail mounting
!
Caution: There is a risk of electrical
shock if this instrument is not properly installed
Caution: Risk of danger: Read the whole
manual before you install this meter
London Electronics Limited
Thorncote Road, Near Sandy, Bedfordshire SG19 1PU
Tel [phone] Fax [phone]
www.london-electronics.com [e-mail]

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.Warranty
We warrant this product against defects in materials or workmanship for a period of three
(3) years from the date of purchase.
In the event of a defect during the warranty period, the unit should be returned, freight (and
all duties and taxes) prepaid by the Buyer to the authorised distributor from where the unit
was purchased.
The Distributor, at its option, will repair or replace the defective unit. The unit
will be returned to the Buyer with freight charges prepaid by the distributor.
LIMITATION OF WARRANTY
The foregoing warranty shall not apply to defects resulting from:
1. Improper or inadequate maintenance by the buyer.
2. Unauthorised modification or misuse.
3. Operation outside the environmental specification of the product.
4. Mishandling or abuse.
The warranty set forth above is exclusive and no other warranty, whether written or oral is
expressed or implied. We specifically disclaim the implied warranties of merchantability
and fitness for a particular purpose.
EXCLUSIVE REMEDIES
The remedies provided herein are the buyer’s sole and exclusive remedies.
In no event shall we be liable for direct, indirect, incidental or consequential damages
(including loss of profits) whether based on contract, tort or any other legal theory.

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Warranty 2
Warnings 4
Introduction 5
General Description 6
Panel mounting & Installation - Class II 7
DIN Rail mounting option 8
Other Mounting options 9
WiringAdvice 10
Connections 11
Installation hints for best performance 12-13
Easy/Advanced menu mode 14
Language Selection 15
Display Brightness 16
Display Calibration Modes 17
Direct Calibration 18-19
Linearisation with Direct Calibration 20-21
Theoretical Calibration 22-23
Linearisation with Theoretical Calibration 24-25
Sensor Drift correction 26
Logic Input functions 27
Logic Input connections & Front Buttons 28
Factory defaults 29
Calibration Audit number 29
Signal Filtering / Averaging 30-31
Last Digit rounding 32
Scale Factor adjustment 33
Offset Adjustment 34
Menu Timeout adjustment 35
Reverse / Mirror display setting 36
Bootup Routine choices 37
Multi Memory MEM option 38
Error Codes 39
Output Options - installing 40
WEEE 41
Equipment Specifications 42
Record of Revisions 43
Declaration of Conformity 44
Separate manuals for options
Alarm option settings See Alarm manual *
Analogue output option settings See Analogue manual *
Serial output option settings See Serial manual *
Real Time Clock setting See Serial manual *
* Need a manual urgently?
You can download manuals from our website
Contents

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Safety First ..............Don't assume anything............. Always double check.
If in doubt, ask someone who is QUALIFIED to assist you in the subject.
Warnings
Please carefully read this manual and all warnings. Install the meter ONLY when you are sure
that you’ve covered all aspects.
Where the product is intended for “UL” installations, removal or
addition of option boards is not permitted.
Check that the model number and supply voltage suit your application before
you install the meter.
Connect the meter according to current IEE regulations, IEC61010 &
NFPA:70 National Electric Code in USA.
This meter is for Installation class II service only. This means it
has exposed electrical and power terminals. You must install it in a
suitable fire enclosure which will also protect users from electric shock
We designed this meter for Pollution-Degree 2 environments only.
Power supplies to this equipment must have anti-surge (T) fuses rated at 400mA for
230V supply, 400mA for 110V supply or 2A for DC supplies in the range 11-30VDC.
Only Siba fuses in series 189500, cULus listed according to file #E167295 are
accepted for this service under the terms of UL listing.Aswitch or circuit breaker, clearly
marked as a disconnecting device, must be included close to the installation.
Don’t touch any circuitry after you have connected the meter, because there may be
lethal voltages on the circuit board.
Only adjust on-board switches or connections with the power turned off
Make sure all screw terminals are tight before you switch the meter on.
Only clean the meter’s front with a soft damp cloth. Only lightly dampen with water.
Do not use any other solvents. The behind-panel case may be cleaned with a dry cloth
only, use no liquid or solvent on it.
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Introduction
Please contact us if you need help, if you have a complaint, or if you have suggestions to help
us improve our products or services.
If you contact us about a product you already have, please tell us the full model number and
serial number, so that we can give you accurate and fast help.
This product has a 3 year warranty. We will put right or replace any meter which is faulty
because of bad workmanship or materials. This warranty does not cover damage caused by
misuse or accident.
If you return a unit for repair, please include a detailed description of the problem, and the
name of a contact who we can refer to for any questions. Please mark for the attention of the
QA Department.
IMPORTANT
If this equipment is important to your process, you may want to buy a spare to cover possible
failure or accidental damage in the future.
This is because during factory shutdown periods, you may have to to wait several weeks for
an equivalent replacement, or we may have no stock at the time you urgently need it.
You may also need to pay extra carriage charges if you want a fast, guaranteed courier service.
Warranty repairs or replacements are usually returned with a standard courier service.
We do not offer compensation for losses caused by failure of this instrument.
If you do not agree with these conditions, please return this item in unused, condition, in its
original packaging and we will refund the purchase price, excluding any carriage paid.
We thought you’d prefer to know about possible delays and extra charges now, rather than
during a panic. A spare unit could help to avoid these issues.
We always try to improve our products and services, so these may change over time. You
should keep this manual safely, because future manuals, for new designs, may not describe
this product accurately.
We believe these instructions are accurate, and that we have competently designed and
manufactured the product, but please let us know if you find any errors.

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General Description
This series of meters accepts industrial sensors to allow various physical measurements to
be made, such a weight, temperature, pressure, humidity etc. Different models are available
for different sensor types.
The main function of this series is to give a numeric readout of the variable being monitored.
Most models include an excitation power output, to power the sensor directly.
Various optional output modules are also available to give alarm relay outputs, analogue
output or digital communications, or any combination of these options.
Meters are programmed using front panel pushbuttons. The buttons may be locked with a
rear switch.
Meters have two power supply options : 100-240 VAC or 11-30VDC
These meters are designed to mount into a protective enclosure which will protect users from
contact with power and signal wiring.
These units must be installed fully assembled, and must be installed according to local electrical
installation rules. When properly installed, they provide ingress protection to IP65 / NMA4X
from the front
Safety
Obey all safety warnings in this manual, and install the meter according to local wiring and
installation regulations. Failure to follow these guidelines may cause damage to the meter,
connected equipment, or may be harmful to personnel.
Any moving mechanical device controlled by this equipment must have suitable access guards
to prevent injury to personnel if the meter should fail.
!
Caution: There is a risk of electrical
shock if this instrument is not properly installed
Caution: Risk of danger: Read the whole
manual before you install this meter

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Panel Mounting and Installation - Class II
Install the meters in a suitable protective electrical control enclosure according to local wiring
regulations. See specifications for maximum allowable temperature in enclosure. Allow
adequate air circulation.
888888
92mm +1mm -0mm
45mm +1mm -0mm
Panel cutout
Installing into front of panel
Remove the two rear bracket
screws and safely store them
and the U-Bracket for later fitting.
Gasket
Gasket
Front surface
of enclosure
Front surface
of enclosure
Front surface
of meter
U-Bracket
Bracket screw (1 of 2) Left side of meter case
U-Bracket
Bracket screws
U-Bracket
Bracket screws
Slide the meter, with gasket
into the panel cutout
Securing into the panel
Re-fit the U-Bracket and tighten the bracket
screws to firmly clamp the meter in place.
Check that the gasket is evenly pinched
between the meter’s front bezel and the
enclosure front
Ventilation
There should be sufficient ventilation in the
enclosure to ensure that the meter’s case is
always kept to less than 60C.
Meter Spacing.
Meters should be spaced apart sufficiently
to allow a free flow of ventilation air around
the meters, such that no part of the case will
exceed 60C
Side view of meter installed in panel

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DIN Rail Mounting option
This Series is ideal if you need high precision signal conditioning. Sometimes, it is not
necessary to have front panel indication, so in such cases, we offer a DIN rail mounting option,
which allows the meter to be installed within a control panel.
Detachable connectors add to the simplicity of installation, and of course the setup method is
identical to the panel mounting version, so you don’t need to learn a new method.
The display remains active, so you can see at a glance the status of your signals, and
programming is simple, using the 4 buttons.
Output functions include isolated 16 bit 4-20mA, 0-10V, -10 to +10V, RS232, RS485 and up
to 4 alarms with a wide choice of alarm functions.
Install the meters in a suitable protective electrical control enclosure according to local wiring
regulations. See specifications for maximum allowable temperature in enclosure. Allow
adequate air circulation.
Securing into the panel
Use standard top-Hat DIN rail 35 mm x 7.5 mm (EN 50022, BS 5584, DIN 46277-3)
Ventilation
There should be sufficient ventilation in the enclosure to ensure that the meter’s case is
always kept to less than 60C.
Meter Spacing.
Meters should be spaced apart sufficiently to allow a free flow of ventilation air around the
meters, such that no part of the case will exceed 60C

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Other mounting options
IP67 SPC4
The SPC4 splashproof cover gives
IP67 / NEMA4-X protection for the
front of your meter. Ideal for use in
harsh wet environments.
Available with optional security tag
ports to allow you to fit your own
crimped wire tamper-seals, to pre-
vent or indicate unauthorised access
(Similar to tags used on electricity
meters)
Wall Box
The Wallbox is sealed IP65 all round,
and is supplied with the meter in-
stalled, for you to wire to, via 3 cable
glands. It comes complete with SPC4
splashproof cover.
We also offer a dual version of this
enclosure, which can take 2 meters,
one above the other.
PCC Series
The PCC series of Portable Carrying
cases is ideal for housing your panel
meters so that they can be used in the
lab. These enclosure come fully
wired, with panel meters fitted and
with IEC switched power connector
plus any input or output connectors,
as required.
Versions are available to accept 1, 2,
4, 6, 8, 12 or 16 meters

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Wiring Advice
This meter uses detachable screw terminal connectors. Refer to the wiring diagram on the
following page for the correct positioning of each wire.
The conductors you use must be suitable for the meter’s temperature, current and voltage
rating, which is broadly described as follows:-
Cable Temperature Rating
All cables must be rated for operation up to 90C continuous.
Cable gauge and screw tightness
The connectors on this instrument can accept conductors up to 16 gauge AWG / 1.5mm2
c.s.a. The minimum cross sectional area shall be 22 gauge AWG / 0.5mm2 . Tighten screw
terminals to 7.0 lb/in torque / 0.8 Nm torque.
Cable insulation voltage rating
Cables shall have an insulation voltage rating of at least 380V continuous.
Wire preparation:
We recommend multi-strand wire, because it withstands vibration better than single strand
cable. Pull the wire firmly after you make the connection to confirm it is tight.
Use screened cable for all signal and control wiring and connect the screen to earth at the
destination end only. Route signal cabling away from power cabling and relay switching
cabling, to avoid electrical noise interference.
U-Bracket
No bare wires exposed
Terminal screwdiver - 3mm blade
Strip back
5mm max.
Outside
enclosure
Inside
enclosure
Side view of meter
Detachable
connectors
125mm behind panel

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Connections
Alarm Lock Calib’n Lock
Analog
o/p option
Serial Data
o/p option
0, 2 or 4 Alarm Relay
o/p options
Common
CC.1 CC.2 CC.3
Logic Inputs Power
Signal I/P & Excitation
Common -
Signal B mA +
Signal A mA +
no connection no connection
Common +
- +AL1 AL2 AL3 AL4
N L
- +
B A Comm Enable
TxD RxD Comm Enable
R S 2 3 2
R S 4 8 5
Rated 2A 250VAC Resistive
Remote
contacts
(5V DC 1mA)
Warning:
Disconnect all power before
exposing the rear of the meter
Connectors and options
Connectors may be present
even if output options are not
installed. Referto rating label
to see installed options.
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Class II Installation
Not used
Fuse Switch
Circuit breaker
Power
Customer-supplied disconnection
and overload protection devices
1 2 3 4 5 6 7 8 9 10 11 12 13
14 15 16 17 18 19 20 21 22 23 24 25 26 27
Enable is used in mode C1
to activate or de-activate the
RS232 or RS485 serial output.
Connect to Comm to continually
transmit data.
2 3 6
+
EXAMPLES
1 2 3
+ +
Active sources of 4-20mA
+ +
Passive sources of
4-20mA, such as 2 wire transmitters

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Installation hints for best performance
This section offers several suggestions which will help you get the best performance from
your measurement system.
Some sensors generate comparitively small signals which can easily be corrupted by the
potentially high level of electrical noise which can be created by electrical machinery such as
motors, welding systems, discharge lighting, AC power inverters and solenoids. These steps
will ensure you get the best possible performance from your system.
1. Use good quality screened signal cable, with twisted pairs. Belden 8777NH,
Belden 9503 and AlphaWire 6010C are good choices, available from many
electrical distributors.
2. If you are using multi-pair twisted cable, each pair should be dedicated to a single
display as shown opposite, for maximum noise immunity.This will ensure that any
electrical noise induced in the cable is properly cancelled. Mixing destinations
carelessly amongst the twisted pairs can actually worsen noise performance.
3. The cable should be routed away from noisy wiring and devices such as power
feeds from inverters, discharge-lighting cables, welder cabling etc, and should
preferrably be routed in a dedicated low voltage signalling/instrumentation conduit
or cable tray.
4. Screened cable should be earthed at the display end only.
5. All wires and screens coming out of the screened cable should be kept as short
as possible to minimise pickup of noise.
6. If you are using barriers, you should earth your screen as shown below, paying
particular care that you do not earth both ends of any run of of cable.
Barriers
EARTH
Connect screen
to earth ONLY
at this end.
Connect screen
to earth ONLY
at this end.
Do not
connect
screen at
this end.
Do not
connect
screen at
this end.
Length of screened cable Length of screened cable
Sensor
Hazardous Area Safe Area
Terminal 7
on logic
input
connector
Clean Earth
Signal Input Logic Input Power Input
Display connections
Sensor connections Barrier connections

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Display 1 Display 2 Display 3
Sensor 1 Sensor 2 Sensor 3
When using multi-core screened cable to connect several displays to several sensors, please be sure to use one twisted pair for each display and sensor. Do NOT use a wire from one pair for signal positive and a wire from another pair for signal negative, as this will prevent the twisted cables form cancelling any induced electrical noise.
Displays
Sensors

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Easy or Advanced menu mode
You can choose from two menu modes.
1. Easy Mode - This limits the menu to the most commonly required features, in order
to make it less complex and easier to navigate. This is the default level.
2. Advanced Mode - This gives you access to all available menu features.
Each menu feature in this manual has a heading note to tell you whether it
is available in Easy or Advanced mode.
How to choose menu mode:-
!
!
Set1 Set2 Output Alarms
Digit OK
Max/Min Reset Lockout Switch must be OFF
Press together briefly
Set1 Set2 Output Alarms
Digit OK
Max/Min Reset
Press briefly
Set1 Set2 Output Alarms
Digit OK
Max/Min Reset
Press to toggle
Set1 Set2 Output Alarms
Digit OK
Max/Min Reset
Press to accept
1
2
3
4Done!
Each press of the DOWN
arrow, or UP arrow will
alternate between showing
Adv. or EASy
This feature is available in Easy and Advanced Modes
OFF
Circuit board ON
Press OK a few times, until you
see Adv. or EASy
Press OK to select your choice.

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Set1 Set2 Output Alarms
Digit OK
Max/Min Reset
Language Selection for user interface
You can select English or French menu prompts.
Lockout Switch must be OFF
Press together, briefly
Set1 Set2 Output Alarms
Digit OK
Max/Min Reset
Display shows
UI Eng (Default)
for User Interface English
or
UI FrA
for User Interface French
1
2
3
Set1 Set2 Output Alarms
Digit OK
Max/Min Reset
Done!
This feature is available in Easy and Advanced Modes
Press to toggle
Press to accept
OFF
Circuit board ON

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Set1 Set2 Output Alarms
Digit OK
Max/Min Reset
Display Brightness
You can adjust the display brightness at any time, provided the display is locked.
Lockout Switch must be ON
Press 3 seconds
Set1 Set2 Output Alarms
Digit OK
Max/Min Reset
Press for 3 seconds
Display shows bright
Each press of the UP button will select a
new brightness level.There are 7
brightness levels to choose from.
(Default = Full brightness)
Set1 Set2 Output Alarms
Digit OK
Max/Min Reset
Press to accept
1
2
3Done!
!
!Did you know, we make this display in two brightness versions?
Standard brightness for use inside, and Daylight Viewing for use outside
in direct sunlight. The Daylight Viewing version has suffix -DLV in its part
number.
This feature is available in Easy and Advanced Modes
OFF
Circuit board ON

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Set1 Set2 Output Alarms
Digit OK
Max/Min Reset
Meter Calibration Modes
You can choose from two main calibration methods.
1. Direct Calibration - this is when you connect the meter to your system and
make the meter read what you want it to, at 2 different points. This is the preferred
calibration method, because it allows you to calibrate the system as a whole.
2. Theoretical Calibration - this is when you type in the sensor’s theoretical
signal level at the bottom and top of itsrange and then type in the value the
display should show, for each signal level.
How to choose a calibration method:-
Lockout Switch must be OFF
Press 3 seconds
Set1 Set2 Output Alarms
Digit OK
Max/Min Reset
Press to select dirECt or thEor
Display shows CAL Src then
dIreCt
or
thEor (Default)
Set1 Set2 Output Alarms
Digit OK
Max/Min Reset
Press to accept
If you chose Theoretical, you will now be asked whether your input signal
will be DC Current or DC voltage ... the display will show Input followed
by dC A or dC V
Set1 Set2 Output Alarms
Digit OK
Max/Min Reset
Press to select dc A or dc V
Display shows Input then
dC A for current or
dC V for voltage (Default)
Set1 Set2 Output Alarms
Digit OK
Max/Min Reset
Press to accept
1
2
3
4
5Done!
This feature is available in Easy and Advanced Modes
OFF
Circuit board ON

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Set1 Set2 Output Alarms
Digit OK
Max/Min Reset
Direct Calibration - Full Scale Setting
This is when you connect the meter to your system and make the meter read what
you want it to, at 2 different points. This is the preferred calibration method, because
it allows you to calibrate the system as a whole.
How to do direct calibration:-
If you have not done so before, please select Direct Calibration mode from
the previous page.
First we recommend you set the FULL SCALE calibration ...
Lockout Switch must be OFF
Display shows direCt followed
by SEt Hi
Press 3 seconds
Set1 Set2 Output Alarms
Digit OK
Max/Min Reset
Apply the highest calibration signal you
can achieve, ideally 100% of system
capacity. You can use less, but you will
get better accuracy with higher signals.
Press OK.
Set1 Set2 Output Alarms
Digit OK
Max/Min Reset
Press for 3 seconds
Set1 Set2 Output Alarms
Digit OK
Max/Min Reset
You can now set the display value you
want to see - use DIGIT to select each
digit in turn, and the UP or DOWN arrow
to increase or decrease each digit’s
value, as required.
Set1 Set2 Output Alarms
Digit OK
Max/Min Reset
Press to accept
1
2
3
4
5
Press Set2 for 3 seconds. You can now
set your decimal point position using
the UP or DOWN buttons.
Press OK when done.
Done!
This feature is available in Easy and Advanced Modes
OFF
Circuit board ON

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Direct Calibration - Zero Setting
How to calibrate the ZERO point.
You can set Zero first, if you prefer, but you will not be able to change the decimal point
position in the ZERO calibration step.
This will not be an issue if your zero calibration reading is 0, but may become
confusing otherwise.
When you have finished your calibration, please remember to put the calibration
lockout switch in its ON position, to protect your settings.
OK
Max/Min Reset
Lockout Switch must be OFF
Set1 Set2 Output Alarms
Digit OK
Max/Min Reset
Apply the lowest calibration signal
you can achieve, ideally 0% of
system capacity.
Press OK.
Set1 Set2 Output Alarms
Digit OK
Max/Min Reset
You can now set the display value you
want to see - use DIGIT to select each
digit in turn, and the UP or DOWN
arrow to increase or decrease each
digit’s value, as required.
Set1 Set2 Output Alarms
Digit OK
Max/Min Reset
Press to accept
1
2
3
4
Done!
This feature is available in Easy and Advanced Modes
Display shows direCt
followed by set Lo
OFF
Circuit board ON
Set1 Set2 Output Alarms
Digit
Press 3 seconds

20
Set1 Set2 Output Alarms
Digit OK
Max/Min Reset
Linearisation with Direct Calibration
If your system is non linear, you can calibrate the meter and correct for this with the
lineariser function.
You will need to apply a series of known loads, starting at 0 and working up to full scale. You
will then tell the meter what it should read for each applied load. You can use up to 10
points.
First, you must select Direct Calibration Mode (see page on calibration Modes)
Then, proceed as shown below...
Lockout Switch must be OFF
Press together, briefly
Set1 Set2 Output Alarms
Digit OK
Max/Min Reset
If the display shows Lin.OFF, press Set2
button briefly so that the display shows
Lin.On, then press OK
Set1 Set2 Output Alarms
Digit OK
Max/Min Reset
1
2
3
4
Set1 Set2 Output Alarms
Digit OK
Max/Min Reset
The display will show SEt 00
Ensure no load is applied to the system
and press OK.
The display will now show rd 00
You can now tell the meter what it should
display for this load.
Select each digit in turn with the DIGIT
button, and increase or decrease each
digit’s value using the UP or DOWN
button, until the display is set as required.
Press OK when done.
This feature is available in Easy and Advanced Modes
The display will show Add.Pt
Press OK
Continued ...
OFF
Circuit board ON
Display will show Lin.On or
Lin.OFF (Default)