London Electronics EasyReader ER4P User manual

Document Ref: manuals\english\EasyReader\EasyReader_4P.p65 Dated: 30 June 2009
Rev. 4
Large display scalable process signal display
EasyReader Model ER4P
Connection details, scaling and general information
Rear case screws - please note
The rear panel is held in place with finger-screws, which
only need to be gently tightened.
Do not use tools to tighten or loosen the screws, as
this could cause damage to the internal threads.
London Electronics Limited
Thorncote Road, Near Sandy, Bedfordshire SG19 1PU
Tel [phone] Fax [phone]
www.london-electronics.com [email protected]

Alphabetic Index
Warnings - Read First ! 2
Automatic zero drift correction 9
Calibration method selection 6, 10
Calibration - Direct method 8
Calibration - Theoretical method 7
Calibration - Tamper detection 9
Connections 5
Wiring and jumper record sheet 16
Count-By (last digit round-up) adjustment 7, 8, 9
Decimal point position selection 7, 8, 11
Declaration of Conformity 17
Filter time constant selection 7 & 8
Front Panel controls 11
General Description 3
Getting Started 4
Introduction 1
Input connection examples 5
Lockout connection 5,7, 8
MIN/MAX button 9, 10, 11
Mounting methods 13, 14
Peak reading memory 9, 10, 11
RESET button 9, 10
Revision record 15
Specifications 12
Suspension mounting 14
TARE control 9, 10, 11
Valley reading memory 9, 10, 11
Wall Mounting 13
Warnings 2
Zero-Drift automatic compensation feature 9
index

1
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 for you.
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 2 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.
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 at some times, for example during our 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 normally returned with a standard courier service.
We do not offer any compensation for losses caused by failure of this instrument.
If you do not agree with these conditions, please return this item now, in unused, clean 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.
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.

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 all warnings and ONLYinstall the meter
when you are sure that you’ve covered all aspects.
!
2
*Connect the meter according to current IEE regulations and separate all
wiring according to IEC1010.
*Power supplies to this equipment must have anti-surge (T) fuses at 125mA for 230V
supply, 250mA for 110V supply or 1A for DC supplies in the range 11-30VDC.
*Check that the model number and supply voltage suit your application before
you install the meter.
*Don’t touch any circuitry after you have connected the meter, because there may be lethal
voltages on the circuit board.
*We designed this meter for Pollution-Degree 2 environments only. This means you must
install it in a clean, dry environment.
*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 with a soft damp cloth. Only lightly dampen with water. Do not use any
other solvents.

General Description
The EasyReader displays are large versions of the popular “Intuitive” Lite process meter family.
They use a dual slope integration method to give up to 9999 count resolution of +/-20mA or
+/-10V analogue input signals. This allows for normal 4-20mA and 0-10V process signals with
9999 count resolution, and 1-5V process signals with at least 9999 count resolution.
You can scale the meter in engineering units to give up to -1999 or +9 999 display range, with
selectable decimal point position.
You can either scale the meter theoretically, using stored calibration figures, or directly, using
signals generated from the process system itself.
An excitation supply gives you loop power for 4-20mA process transmitters.
These meters have some features of their parent “Intuitive” meters :
*Digital signal filtering
*Last digit rounding (count by 1, 2, 5, 10, 20, 50)
*Minimum (valley) and maximum (peak) reading memory
*Display taring
We offer two power option models 95-265 VAC or 11-30VDC
3

Getting Started
First, check that the display will suit your application and the available power source (either 95-265
VAC or 11-30 VDC).
If you asked us to configure the display for you, please check that the scaling and settings agree
with your requirements.
We fully tested and calibrated your display for you, but a pre-installation test may be useful to check
that everything works as needed.
Remove the screws which hold the rear panel in place.
Feed the signal and power cables through the cable glands.
Connect the signal and power cables to the appropriate screw terminal connectors. See our
connection drawing to check that you are using the correct terminals.
Check, before switching on, that the power is suitable for the unit.
Switch on, and the display should show ‘EPX.X’ for a second or two. (where EPX.X is the software
version). Units with custom software will have a different prompt.
Next, ‘C. XX’ will appear for a second or two. The XX value increases each time a calibration is
completed. The display should then show a steady reading relating to zero input signal; for the
factory default 4-20mA scaling, this should be between -24.9 and -25.1.
4

Direct 4-20mA I/P
Connections
We supply detachable screw terminal connectors to make installation as easy as possible for you.
You should use multistrand insulated wire with ferrules to DIN46228/1. You can use stripped wire
with cross sectional area from 0.5 to 2.5mm
2
. Strip back insulation 7mm.
3 cable glands accept the 3 groups of cables up to 6mm diameter.
Use screened cable for the input signal and connect the screen to power earth at the meter end of
the cable only. For best performance, keep the signal cable well away from the power and alarm
cables, which could carry electrical noise likely to interfere with your measurement.
Input Connection Examples:
+
Loop powered 2 wire
4-20mA transmitter
I/P
4-20mA from
active source.
Direct 0-10V I/P
0-10V from
active source
5
Common
Calibration mode
Tare
Peak/Valley
Reset
Screen
termination
point
Excitation + 0-10V + 4-20mA + Common Lockout
Excitation + 0-10V + 4-20mA + Common Lockout
Earth
Neutral
Line
Power
Logic I/Ps
Signal I/P
Locked
Unlocked
Locked
Unlocked
Locked
Unlocked
Excitation + 0-10V + 4-20mA + Common Lockout
Excitation + 0-10V + 4-20mA + Common Lockout
You can operate the Tare,
Peak/Valley and Reset functions
remotely with contact closures,
or with the front panel buttons.
To activate the front panel
buttons, you must make
permanent connections
between the desired function
connector and Common

Calibration Methods
There are two ways you can calibrate your meter. You can type-in theoretical calibration values, or
you can connect the meter to your system and make the meter’s readings agree with known
conditions in the system.
1) Calibration without the need for an input signal.
This is known as the ‘THEORETICAL’Calibration method
Disconnect the ‘calibration mode’ terminal from common to enable this method.
If you know the input signal range, and the display values required, you can tell the meter what to
read for two known signal levels. Let’s assume that you have a sensor giving 4-20mA for a pres-
sure range of 0 to 250 bar. Select the ‘THEORETICAL’calibration switch position on rear of the
meter.
You need to tell the meter what 0% input signal level will be (4mA) and then what 0% reading value
will be (0). Next, you’d tell it what 100% input signal level will be (20mA) and what 100% reading
value will be (250).
2) Calibration when you inject signals into the meter, either from a calibrator or a sensor in
the system.
This is known as the ‘DIRECT’ calibration method. Signals must be stable.
Connect the ‘calibration mode’ terminal to common to enable this method.
This can give the best system precision, because you weill use real signals as your reference, and
any errors in the meter or sensor will be allowed for in the calibration process. You need to select
the ‘DIRECT’ calibration switch position on the rear of the meter.
Apply 0% of signal range. (If the signal comes from a sensor, you don’t need to know the value of
signal itself, only what the meter should read at that time. Let’s assume you have a pressure
sensor covering 0-250 Bar) Using the buttons on the meter, you’d tell the meter what it should read
now(ie with no pressure applied to the sensor, should read 0).
Now apply 100% of signal range (If the signal comes from a sensor, apply 250 Bar to the sensor or
a lesser known pressure. The accuracy of calibration will be better with higher applied signals).
Using the buttons, you’d adjust for a reading of 250, or the lesser pressure you applied.
A separate, dedicated page covers this calibration method in detail.
6

‘THEORETICAL’Calibration
Connect ‘Lockout’ terminal to ‘Common’ terminal.
Disconnect the ‘calibration mode’ terminal from common.
1) How to set SPAN and DECIMAL POINT
Press the SPAN button for 3 seconds. You’ll see ‘dC V’ or ‘dC A’ if the meter is set for DC Voltage or
DC current. Use the up or down arrow to change, if needed and then press OK.
You’ll now see ‘In.HI’ briefly, then a value, with one digit brighter than the other. This is 20.000 for
a 4-20mA input signal, or 10.000 for a 0-10V input signal, 5.000 for a 1-5V input signal and so on. If
the value is correct, press the ‘OK’ button, otherwise use the ‘DIGIT’ key to select digits, and the
‘UP’ or ‘DOWN’ arrow keys to alter. When correct, press the ‘OK’ button.
‘rd.HI’ appears briefly, then a value, with one digit brighter than the other. This is what will be dis-
played for the In.HI input. If the value is correct, press the ‘OK’ button , otherwise use the ‘DIGIT’ key
to select digits, and the ‘UP’ or ‘DOWN’ arrow keys to alter . The Decimal point position may be
set after the most significant digit has been selected. When correct, press the ‘OK’ button.
2) How to set ZERO
Press the ZERO button for 3 seconds. You’ll see ‘In.LO’ briefly, then a value, with one digit brighter
than the other. This is 4.000 for a 4-20mA input signal, 0.000 for a 0-10V input signal, 1.000 for a
1-5V input signal etc. If already correct, press the ‘OK’ button. Or, use the ‘DIGIT’ key to select
digits, and the ‘UP’ or ‘DOWN’ arrow keys to change. When correct, press the ‘OK’ button.
You’ll now see ‘Lo.rd’ briefly,then a value, with one digit brighter than the other. This is what will be
displayed for the In.LO input. If already correct, simply press the ‘OK’ button. Or, use the ‘DIGIT’ key
to select digits, and the ‘UP’ or ‘DOWN’ arrow keys to change. When correct, press the ‘OK’
button.
Now, remove the link from ‘Lockout’ to ‘Common’ to save settings.
3) How to set the Filter Time constant
Press the OK button. You will see ‘F X’with the present time constant, in seconds. You can
change this by pressing the ‘UP’ or ‘DOWN’ arrow keys. Press ‘OK’ when done.
4) How to Select Count by Value (after Filter Time constant - above)
After you set the Filter Time Constant, ‘Cb. X’ will appear, with XX as the count-by number. Use the
UP or DOWN buttons to select counting by 1, 2, 5, 10, 20 or 50. Press OK when done.
7

‘DIRECT’ Calibration
Connect ‘Lockout’ terminal to ‘common’ terminal
Connect ‘calibration mode’ terminal to ’common’
Connect the display to power and a steady input signal before you start. Leave the display powered
for 15 minutes before you start, to allow it to reach normal operating temperature.
1) How to set the Span Calibration and Decimal Point position
1) Apply 100% Cal. signal, and ensure it is steady before proceeding
2) Press the SPAN Button for 3 seconds
3) Set the display to read your desired fullscale for the signal you’re
injecting by pressing UP/DOWN Keys. To change the decimal point position, use the
DIGIT button to brighten the left-hand digit. Then, one more push of the DIGIT button
will allow you to move the decimal point with the UP/DOWN buttons.
4) When correctly set, press OK
2) How to calibrate Zero
1) Apply the Lowest cal. signal and ensure it is steady before proceeding
2) Press the ZERO Button for 3 seconds
3) Set the display to read 0 , or the desired reading for this signal, by
pressing DIGIT SELECT and theUP/DOWN Keys
4) Press OK when done
That completes the calibration of your display
Now, remove the link from ‘Lockout’ to ‘Common’ to save settings.
3) How to set the Filter Time constant
Press the OK button. You will see ‘F X’with the present time constant, in seconds. You can
change this by pressing the ‘UP’ or ‘DOWN’ arrow keys. Press ‘OK’ when done.
4) How to Select Count by Value (after Filter Time constant - above)
After you set the Filter Time Constant, ‘Cb. X’ will appear, with XX as the count-by number. Use the
UP or DOWN buttons to select counting by 1, 2, 5, 10, 20 or 50. Press OK when done.
8

Features
Automatic Zero-Drift Compensation
This cancels long-term zero drift due to ageing, temperature drift, etc. If the reading is within 7
counts of zero for around 100 seconds, the reading will go to zero without changing basic calibra-
tion. The correction is not stored when the meter is switched off and is cleared with a RESET
input. To activate this feature, set the display value at 0% input to MINUS ZERO ( -0)
Reset Input
Front panel or remote contact RESET command sets the Peak and Valley memories to latest
display value, clears Tare, automatic Zero compensation offset and clears digital filtering history
memory.
Peak and Valley Detection (Maximum/Minimum Reading View)
The meter stores the lowest and highest reading values in memory. Press the MAX/MIN front panel
button or remote contact to view. The first press shows peak, with the upper left hand indicator bar
lit. The second press shows valley, with the lower left hand indicator lit. The display returns to the
running value after 2 or 3 seconds. Peak and Valley values are not stored if you switch the meter
off. Clear memory with the RESETinput.
Tare Command
Press the front panel tare switch for more than 2 seconds, or make a momentary contact closure
to the TARE terminal and Common if you want to force the display to 0. Following readings will be
the ‘net’ value. The tare value is ‘remembered’ when the meter is switched off. You can clear this
memory with the RESET input.
Digital Filtering
Asimple digital filter gives ‘R-C’ type time constants in the range 0 to 5 seconds. Avalue of 1
second gives a settling to 1% in around 5 seconds for a small step input. The filtering averages
ripple in the input signal. For ‘large’ steps of signal input the filtering is bypassed, to give a fast initial
response. You can reset the filtering by pressing the front panel reset switch for 2 to 3 seconds.
Last Digit Rounding
You can set the meter to count by 1,2,5,10,20 or 50 so that display flicker can be hidden.
Calibration Counter / Tamper detector
A internal totaliser counts each calibration. The ‘C. XX’ value appears for a second or two after you
switch the meter on. The number starts at 00 and can go up to FF (255 counts). It doesn’t count
changes of filter value or count-by value in the ‘theoretical calibration’ menu. It stores the total in
non-volatile memory which can’t be reset, useful for keeping track of the meter’s calibration history.
9

10
Contact closure inputs
Common
Calibration mode
Tare
Peak/Valley
Reset
Remote contact-closure inputs
Tare
Peak/valley
Reset
The contact closure inputs allow you to operate the Tare, peak/valley and reset functions
remotely, but only when the meter is ‘locked’ - see page 5.
The switched signal is 5V DC at a current of 1.5mA
CALIBRATION MODE A contact closure which selects either direct or theoretical
calibration method.
Contact open = Theoretical calibration
Contact closed = Direct calibration
TARE Contact closure resets the displayed value to zero,
regardless of input signal level.
PEAK/VALLEY Contact closure sequentially displays the peak and valley
values, since the display was last reset.
The display will time out and return to showing the actual
input after 3 seconds.
RESET Contact closure will reset the stored Tare, peak and valley and
averaging history values.

Front panel controls
Control Type 4 pushbutton switches located behind a flexible overlay.
Function Depends on mode (whether locked or in setup mode)
Also depends on remote input contact status - see below..
Normal running mode (Locked)
TARE Press to tare the reading to zero, if the remote Tare terminal is connected to
Common.
MAX / MIN Selects max/min/current readings, in turn if the remote MIN/MAX
terminal is connected to Common.
RESET Press to reset any tared value, max., min. and filter history if the remote
Reset terminal is connected to Common.
Setting mode (unlocked)
ZERO Press for more than 3 seconds. Lets you adjust the
meter zero calibration
SPAN/d.p. Press for more than 3 seconds. Lets you adjust the meter
span calibration, decimal point position, filter time constant
and count-by last digit roundup.
DIGIT Chooses a digit to be changed on the display, while adjusting.
UP arrow Each press increases a chosen digit value, while adjusting.
DOWN arrow Each press decreases a chosen digit value, while adjusting.
OK Confirms any changes made or skips to next step.
DIGIT
ZERO SPAN
Tare Min/Max Reset
OK
Common
Calibration mode
Tare
Peak/Valley
Reset
Contact-closure inputs are used to activate front-panel buttons
Link to activate ‘Tare’ button
Link to activate peak/valley button
Link to activate Reset button
11

Specifications
12
Bezel size 415mm wide x 195mm high
Case Depth 75mm
Weight 900 grammes
Case Material Black uPVC with Acrylic lens
Connectors Internal Detachable Screw Terminal connectors
Operating Temp. 0 to 50 degrees C, non condensing humidity
Storage Temp. -20 to 70 degrees C
Power supply 95-265 VAC or 11-30 VDC optional
Power consumption 8 watts maximum
Input Signal Ranges +/-20mA +/-10V
Operating Overload +/-22mA +/-12V
Maximum Overload +/-150mA +/-100V
Input Resistance 33 Ohms +/-2% 1 Megohm nominal
Display type High efficiency LED, red or green
Digit height 102mm (A 57mm high model is also available)
Display Rangability Fully digitally scalable for ZERO and SPAN readings anywhere in
the range -1999 to 9999 with selectable decimal point positon
Viewing distance 50 metres (25 metres with 57mm digit model)
Accuracy +/-0.1% of range +/-2 counts
Span tempco 100ppm/Degree Celsius max
Zero Tempco 50ppm/Degree Celsius
Excitation voltage 24VDC +/- 20% rated at 30mA. Noise 200mV max
(50Hz-100KHz)
Filtering Selectable time constants up to 5 secs in 0.5sec
increments
Count-by (roundup) 1, 2, 5, 10, 20 or 50
A/D conversion Dual slope -1999 to +9999 count maximum resolution
CMRR 100dB 0-60Hz. 250V max.
NMRR 60 db at 50/60 Hz.
Display update rate 2.5 readings per second
Memory 10 year data retention. No batteries required.

13
How to Mount your display
Wall mount your EasyReader display in a clean, dry environment.
Drill 4 holes in your wall, spaced as you see in this diagram...
The mounting screws you use should have a diameter between 3.4 and 4.6 mm and should
be suitable for the material of the wall. You may need to use wall plugs or other screw
accessories, if the wall material is not suitable to take screws directly.
Route cables neatly away from the display. If the cables may become damaged in the
environment, protect them with suitable conduit or trunking.
407 mm
Place the brackets as shown, so that the display covers
the 4 mounting screws
365 mm
The 4 bracket holes are all 5mm diameter
Fit the brackets to the wall.
Then, fit the display between the brackets.
1. Wall Mounting
M8 Spring Washer
M8 Plain Washer
25mm rubber washer
M8 Pan Screw
Wall bracket
25.0 mm
47.5 mm
2.5mm
Side View
Wall

14
14
How to Mount your display ... continued
1. Suspension Mounting
Suspension mount your EasyReader display in a clean, dry environment.
The mounting screws you use should have a diameter between 3.2 and 3.8 mm and should
be suitable for the supporting material. You may need to use screw plugs or other screw
accessories, if the material is not suitable to take screws directly.
Mount the brackets first, then fit the display to the brackets.
Route cables neatly away from the display. If the cables may become damaged in the
environment, protect them with suitable conduit or trunking.
85.0 mm 85.0 mm
View down onto top of bracket
3 holes 4.5mm diameter
M8 Spring Washer
M8 Plain Washer
25mm rubber washer
M8 Pan Screw
25.0 mm

Record of Revisions
16 December 2003 Product released
25 March 2004 Added Wiring and Jumper record sheet to page 16
8 November 2005 Added side view for wall mounting case on page 13
15

16
Wiring and jumper record
For future reference, record all the jumper positions and wiring colours you used in your installation.

Declaration of Conformity
Conditions
The meters are permitted a worst case error of 1% of A/D range during electro-magnetic
disturbance, and must recover automatically when disturbance ceases without the need for human
intervention, such as resetting, power-down etc.
Note: RF interference in the range 20MHz to 75MHz, with an amplitude greater than 8V on the
power cables may cause the display to show “Err” . This effect will cease when the interference
is removed. This effect may be cured by adding clip-on ferrite cores around the power cable, close
to the display.
The meters covered by this certificate must be installed in adherence to the following conditions :-
Signal cabling shall be routed separately to power carrying cabling (includes relay output wiring)
All signal cabling shall be screened. The screen shall only be terminated to the power earth terminal
This is to confirm that the Product covered by this declaration have been designed and manufactured
to meet the limits of the following EMC Standard :
EN61326-1:1997
and has been designed to meet the applicable sections of the following safety standards
EN61010-1:2001
Declaration Reference : EasyReader
Issue Date : 16 December 2003
Products Covered : EasyReader series
Title : DOC-EasyReader
Declared as true and correct, for and on behalf of London Electronics Ltd.
J.R.Lees Director
17