Landis & Gyr 5235 Manual

Electricity Meters
Residential BS / IEC British Standard
5235 Single Phase Credit Meter
User Manual & Technical Specification
Date: 20/11/08
Filename: 5235 User Manual
Q Pulse No:IB047
© Landis+Gyr

Page 2 of 21 Issue: 4 5
© Landis+Gyr 5235 Single Phase Credit Meter –User Manual & Technical Specification
Revision History
Issue
Date
Comments
1.
10/10/04
New document
2.
10/01/05
Added section on the No power read and Appendix B. Added Document number.
3.
01/11/05
Added new amendments
4.
15/02/06
Added D-L version removed F version (reactive energy still needs adding)
5.
18/11/08
Revised manual to new branding guidelines and layout
Copyright notice
The material in this document is the property of Landis+Gyr. Our products are under continual
improvement and we reserve the right to make changes without prior notice
Landis+Gyr
1 Lysander Drive,
Northfields Industrial Estate,
Market Deeping,
Peterborough
PE6 8FB
www.landisgyr.com

Table of Contents Issue: 4 Page 3 of 21
5235 Single Phase Credit Meter –User Manual & Technical Specification © Landis+Gyr
Table of Contents
1Introduction____________________________________________________________5
1.1 Purpose _________________________________________________________________5
1.2 Meter Overview ___________________________________________________________5
1.3 Model versions____________________________________________________________5
1.4 Reference Standards _______________________________________________________5
1.5 20 Year Certification Life ____________________________________________________5
2Safety Information ______________________________________________________7
2.1 Responsibilities ___________________________________________________________7
2.2 Safety Regulations_________________________________________________________7
3Operational Functions ___________________________________________________9
3.1 Measurement_____________________________________________________________9
3.2 Anti-creep _______________________________________________________________9
3.3 Meter Memory ____________________________________________________________9
3.4 Reverse / Export Energy registration __________________________________________9
4User Interfaces ________________________________________________________11
4.1 Register Displays _________________________________________________________11
4.2 Pulsed Output (Option) ____________________________________________________11
4.3 Switching inputs (D model)_________________________________________________11
5Installation____________________________________________________________13
5.1 Construction_____________________________________________________________13
5.2 Meter fixing _____________________________________________________________13
5.3 Wiring _________________________________________________________________13
6Technical Summary ____________________________________________________15
6.1 Technical Summary _______________________________________________________15
6.2 Dimensions _____________________________________________________________16
7Maintenance and Service________________________________________________ 17
7.1 Meter Check_____________________________________________________________17
7.2 Meter Testing____________________________________________________________17
7.3 Post Installation Configuration Changes _______________________________________17
8Measures in the Event of Faults __________________________________________ 18
8.1 Operating Faults _________________________________________________________18
8.2 Disconnecting the Meter ___________________________________________________18
8.3 Repairing the Meter_______________________________________________________18
9Decommissioning and Disposal__________________________________________20
10 Glossary of Terms and Standards ________________________________________ 21
10.1 Acronyms_______________________________________________________________21

Page 4 of 21 Issue: 4 5 Table of Contents
© Landis+Gyr 5235 Single Phase Credit Meter –User Manual & Technical Specification
10.2 Measurement Units ______________________________________________________ 21

Introduction Issue: 4 5 Page 5 of 21
5235 Single Phase Credit Meter –User Manual & Technical Specification © Landis+Gyr
1 Introduction
Introducing the 5235, single and multi-rate tariff options, Single Phase BS
Standard Credit Meter
1.1 Purpose This document details the functions for the following variants of the 5235
Single Phase Credit Meters, active energy only.
Single Rate, kWh meter
Single Rate, kWh meter with class A pulse output
Multi-rate Externally switched meter
1.2 Meter Overview
The meter is a whole current static electricity meter capable of measuring
kWh in single and two rate variants. An additional option to have a pulsed
output is also available on the single rate version. The meter is approved to
IEC62052 –11: 2003 & IEC62053 –21:2003 classes 1.0 and 2.0 and has
been given a 20 year certification life by OFGEM.
The meter is sealed for life by a liquid welding process and therefore does
not carry an external wire seal.
All meter types feature an optical port used for reprogramming. The
metrology LED is incorporated into this port and pulses at a rate of 1000
impulses per kWh.
All facia details are permanently laser etched directly onto the meter front.
Options would normally include property details, serial numbering and
various barcode options. Other details may be printed such as customer
logo’s and meter type codes etc.
1.3 Model versions
A character denotes meter version after the model number:
A - Single rate only active only
B - Single rate with pulsed output active only
D - Externally switched two-rate active only
1.4 Reference Standards
The meter has been tested by OFGEM and has the following certification.
IEC62052 –11: 2003. IEC62053 –21:2003. Alternating current static
watt-hour meters for active energy (Classes 1 & 2). Other standards are in
the technical summary.
1.5 20 Year Certification Life
This meter has been given a certification life of 20 years by OFGEM the UK
regulatory body. This has been achieved by proving the reliability of each of
the components in the meter and by using mathematical models provided

Page 6 of 21 Issue: 45 Introduction
© Landis+Gyr 5235 Single Phase Credit Meter –User Manual & Technical Specification
by OFGEM. This modelling has shown a reliability of better than 97% over
twenty years. The OFGEM approval number for this meter is 986.
OFGEM certificates and lifetime reports are available upon request. Please
contact [e-mail]

Safety Information Issue: 4 5 Page 7 of 21
5235 Single Phase Credit Meter –User Manual & Technical Specification © Landis+Gyr
2 Safety Information
Attention is drawn as follows in the individual chapters of this user manual
with classified word symbols and pictographs to the relevant danger level,
i.e. the severity and probability of any danger:
Definition of Danger
This symbol is used to indicate a possibly dangerous situation which could
result in severe physical injury or a fatality.
Definition of Warning
This symbol is used to indicate a possibly dangerous situation which could
result in minor physical injury or material damage.
Definition of Note
This symbol is used to indicate general details and other useful information.
In addition to the danger level, all safety information also describes the type
and source of the danger, it’s possible consequences and measures to
counteract the danger.
2.1 Responsibilities
The owner of the meters –normally the utility –is responsible that all
persons engaged on work with meters:
Have read and understood the relevant sections of the user manual.
Are sufficiently qualified for the work to be performed.
Strictly observe the safety regulations (according to section 1.6) and
the operating information in the individual chapters.
In particular, the owner of the meters bears responsibility for the protection
of persons, prevention of material damage and the training of personnel
(Landis+Gyr. provides training courses for this purpose on specific
equipment; please contact the relevant agent if interested).
2.2 Safety Regulations
The following safety regulations must be observed at all times:
This equipment does not contain a disconnection device. Means for
disconnection from the supply must be provided as part of the
building installation. Do not work on the equipment unless the

Page 8 of 21 Issue: 45 Safety Information
© Landis+Gyr 5235 Single Phase Credit Meter –User Manual & Technical Specification
supply is disconnected. If disconnection is done by removal of fuses
or other cut-outs, the removed disconnection devices must be kept
secure from replacement while work is performed. If disconnection
is provided by a switch, the switch shall conform to the requirements
of IEC 947-1 and IEC 947-3 or equivalent.
This equipment does not contain an overcurrent protection device.
Overcurrent protection must be provided as part of the building
installation. Maximum overcurrent device rating is 100 Amp at 415
Volts, conforming to the requirements of BS1361, or equivalent.
The maximum rating of the meter is 100A and requires connecting
conductors of 25mm2. Failure to do so could result in irreparable
damage to the meter. If smaller connecting conductors are used an
appropriate mains fuse must be used.
Only suitably trained and qualified personnel shall be allowed to
work on the equipment. Local safety standards shall be observed
and shall take precedence over these regulations in points of
conflict.
The meters must be held securely during installation. They can
cause injuries if dropped.
Meters that have fallen must not be installed, even if no damage is
apparent, but must be returned for testing to the service and repair
department responsible (or the manufacturer). Internal damage can
result in functional disorders or short-circuits.
The meters must on no account be cleaned with running water or
with high-pressure devices. Water penetrating can cause short-
circuits.
The meter terminal cover should be secured in place before any
load is supplied.

Operational Functions Issue: 4 5 Page 9 of 21
5235 Single Phase Credit Meter –User Manual & Technical Specification © Landis+Gyr
3 Operational Functions
The standard operational functions of the 5235
3.1 Measurement
The Meter is a 120V or 220-240Vac, 50Hz or 60Hz, 5 to 100A Single
Phase Credit Meter. It contains a measuring element capable of measuring
active energy (kWh). The meter measures and registers kWh up to class
1.0. accuracy. The metrology LED is incorporated into the optical port and
pulses at a rate of 1,000 impulses per kWh for energy registration. All
variants offer a test mode, which shows 3 decimal places and is reset when
voltage is removed.
3.2 Anti-creep
Below starting current, the meter enters into an anti-creep mode. In this
state the metrology LED is permanently lit and the registers do not
increment. The LED remains lit until the meter current is increased in a
forward direction beyond the starting current. The starting current is shown
in the technical summary.
3.3 Meter Memory
All the meters data is to be recorded in a Ferroelectric Random Access
Memory (FRAM) under the control of the microprocessor. All the kWh
registers are stored in the FRAM and will be updated periodically and on
power-fail. The FRAM is able to be re-written throughout the life of the
meter and will hold the information, if required for over twenty years.
3.4 Reverse / Export Energy registration
Three factory configurable reverse energy modes can be set as follows:
Export Energy Registration
A reverse / export energy register stores the value of kWh recorded by the
meter in a reverse direction. The register may be configured as part of the
display cycle of the meter. Alternately the register is held in memory and
can be read from the meter via the IEC 1107 port. The Reverse energy
register can be displayed with 0, 1 or 2 decimal places. Export energy will
be recorded in the same way as forward (Import) flowing energy using
identical starting currents etc.
A
B
C
D
E
F
Total Reverse
Reverse Energy Detection
A configurable option within the meter will alternate a warning message on
the display should a fraud attempt be made by running current backwards

Page 10 of 21 Issue: 45 Operational Functions
© Landis+Gyr 5235 Single Phase Credit Meter –User Manual & Technical Specification
through the meter. The reverse energy warning message is triggered when
the reverse power exceeds a programmable threshold level of between 1-
10 Amps for a period of 10Wh. Once this level is reached the message
below will be displayed which can only be reset via the IEC 1107 port.
Whilst in this mode the LED will remain lit whilst there is reverse energy
detected.
Reverse Energy Detection Message
Unidirectional Register
An optional requirement is to accumulate both import and export energy
into the same register. Basically this will be the sum of adding both forward
and reverse energy resisters. The register would be shown as the normal
kWh display as below:
A
B
C
D
E
F
Total Display
No Power Read (option)
This allows the user to take meter readings when there is no mains
electricity supply. This is achieved by installing a battery supply board that
powers the meter. The user applies a magnet to the outside of the meter
case and the meter powers up for 20 to 30 seconds. During this time the
meter displays the sign on and then displays the energy registers.

User Interfaces Issue: 4 5 Page 11 of 21
5235 Single Phase Credit Meter –User Manual & Technical Specification © Landis+Gyr
4 User Interfaces
The inputs and outputs of the 5235
4.1 Register Displays
Single rate version -versions A & B
Single rate meters display the total kWh reading only. The display is
configurable to show either whole numbers, 1 or 2 decimal places. The
meter is also factory configurable to display either 5 or 6 digits with roll over
to zero at 99999 or 999999.
Two-rate meter (external time switch) - D version only
kWh are recorded at a particular rate and displayed using the rate
enunciators on the left hand side of the display. The rate registers are
displayed between 0 and a maximum of 2 decimal places unless configured
to 3 decimal places of testing purposes via the optical port.
The rate register range is 00000.00 –99999.99 kWh unless factory
configured to six digits. The diagram shows a display sequence for a four-
rate meter and total register below. In the two rate variant the meter may be
configured to operate between 1 and 2 rates via the Optical port.
Rate 1 display. Flashing enunciator indicates active rate
A
B
C
D
E
F
Rate 2 Display
4.2 Pulsed Output (Option)
The type B meter has an optically isolated, voltage free open collector
Pulse Output that is configurable to between 1 and 1000 pulses per kWh.
To maximise operation with external monitoring devises, the pulse width
can also be configured to between 20 and 260 mS in 20 mS steps.
Configuration is made through the IEC 1107 port.
The output meets IEC62053-31: 1998 Class B, Maximum voltage 15Vdc.
4.3 Switching inputs (D model)
The configuration is factory set allowing the meter to operate as a single or
two rate meter. Rate switching is achieved by switching neutral or live to
the input terminal. See wiring diagram for the D model.

Page 12 of 21 Issue: 45 User Interfaces
© Landis+Gyr 5235 Single Phase Credit Meter –User Manual & Technical Specification
5235D-L Live switching model
5235D-N Neutral switching model

Installation Issue: 4 5 Page 13 of 21
5235 Single Phase Credit Meter –User Manual & Technical Specification © Landis+Gyr
5 Installation
Construction, Mounting and wiring of the 5235
5.1 Construction
The Credit Meter case meets the requirements of BS5685 and is
manufactured from following materials: -
Meter Base:
Flame Retardant and UV stabilised Polycarbonate
Meter Top:
Flame Retardant and UV Stabilised Polycarbonate
Terminal Cover:
Flame Retardant and UV Stabilised Polycarbonate
Terminals:
Solid Brass extrusion, 8.3mm diameter with 2 screws
5.2 Meter fixing The meter is mounted using the two fixing holes found either side of the
terminal housing. To aid terminal cover sealing, the screw boss has four
raised indicators that should be aligned against the indicator on the cover.
5.3 Wiring Terminal arrangement conforms to BS5685, Part1, 1979. Wiring diagrams
can be put onto the terminal covers of the meters.
L
N
L
N
Supply Load
Meter
Element
Meter type 5235 A and F
L
N
L
N
Supply Load
Meter
Element
Wh
Meter type 5235 B

Page 14 of 21 Issue: 45 Installation
© Landis+Gyr 5235 Single Phase Credit Meter –User Manual & Technical Specification
L
N
L
N
Supply
Load
Meter
Element
Time switch
Meter type 5235 D - N
L
N
L
N
Supply
Load
Meter
Element
Time switch
Meter type 5235 D –L

Technical Summary Issue: 4 5 Page 15 of 21
5235 Single Phase Credit Meter –User Manual & Technical Specification © Landis+Gyr
6 Technical Summary
The technical specifications of the 5235
6.1 Technical Summary
System Voltage
Single element meters
240Vac Phase to Neutral
230Vac Phase to Neutral
220Vac Phase to Neutral
210Vac Phase to Neutral
Supply variation
+15% to -20%
Voltage withstand
415V continuous
10kV impulse @105J
Current (Base)
Direct connection Ib
5A, 10A, or 20A
Current (Max)
Imax
40A, 60A, 80A or 100A
Starting Current
(IEC)
0.4% of Ib
Max measuring range
20mA up to 100A
Measuring Accuracy
IEC 62053-21
Class 1 and 2
Burdens
Voltage Circuit @ 230Vac
0.9W 7.7VA
Current Circuit @ Ib
0.1VA
Supply Frequency
Nominal
50Hz or 60Hz
Frequency Variation
+/- 5%
Temperature Range
Limit operating ranges
-20°C to 55°C
Storage range
-25°C to 70°C
Meter Constant
1000 imp/kWh
Pulse output
The output meets IEC62053-31:
1998 Class B, Maximum voltage
15Vdc
Display
Type –7 character, 7segment LCD
Character size –83.5 mm.
Quality
Manufactured to:
ISO 9001:1994
Ofgem approval number
986
Certificated life
20 years
Reference standards
IEC62052 –11: 2003 & IEC62053 –21:2003 Alternating current static
watt-hour meters for active energy. (Classes 1 & 2)
BS5685: 1979: Part 1:Specification class 0.5, 1.0 and 2.0 Single phase
and Polyphase, single rate and multi-rate watt-hour meters.
IEC62056 –21: 2002.Data Exchange for Meter Reading, Tariff and Load
Control. Direct Local Exchange.
SI1566: 2003The Meters (Certification) Regulations 1990.
Construction
Flame Retardant and UV
Stabilised Polycarbonate
Terminal arrangement
BS5685
Terminal size
8.3 mm diameter.
Weight
Standard Terminal Cover
304g
Extended Terminal Cover
338g
Dimensions (mm)
Standard Terminal Cover
H 80 x W 125 x D 36
Extended Terminal Cover
H 113 x W 126 x D 41

Page 16 of 21 Issue: 45 Technical Summary
© Landis+Gyr 5235 Single Phase Credit Meter –User Manual & Technical Specification
6.2 Dimensions

Maintenance and Service Issue: 4 5 Page 17 of 21
5235 Single Phase Credit Meter –User Manual & Technical Specification © Landis+Gyr
7 Maintenance and Service
7.1 Meter Check
While it isn’t necessary, under normal circumstances, to perform any
maintenance on the installed meter, the following are check points that
should be observed during scheduled periodic meter visits.
Is the meter dry and clean, particularly the LCD display and the
optical interface?
Does the meter display a legible and sensible display? i.e. does the
meter appear in a serviceable condition.
Check all factory fitted and company fitted seals are in place secure
and intact.
Observe display for any error messages or notifications
Confirm that the energy registers have changed to a reasonable
degree since the last visit.
If irregularities are found, continue as in section 8.
7.2 Meter Testing
The testing of meters, either random sample or on all meters, should be
carried out periodically according to national regulations. The meter must
be removed as described in section 8.3 and replaced with a meter of similar
type for the duration of the tests.
7.3 Post Installation Configuration Changes
With the aid of a laptop computer or other suitable hand held device a flag
probe and Landis+Gyr specific software, it is possible to amend the factory
configured options of the meter. It is beyond the scope of this manual to
describe in any further detail the procedure. Landis+Gyr sales team would
be happy to discuss specific requirements.

Page 18 of 21 Issue: 45 Measures in the Event of Faults
© Landis+Gyr 5235 Single Phase Credit Meter –User Manual & Technical Specification
8 Measures in the Event of Faults
8.1 Operating Faults
If the LCD window is illegible or the data readout does not function, the
following points should be checked.
Is the mains voltage present? –Are the preliminary fuses intact?
Has the minimum or maximum recommended ambient temperature been
exceeded?
Is the LCD window clear of all debris? –Not misted over, painted over or
soiled in any way.
If none of the above are causing the fault the meter should be disconnected
as per section 8.2, replaced if required as detailed in section 5 and returned
to Landis+Gyr as described in section 8.3.
8.2 Disconnecting the Meter
Remove preliminary fuses before continuing
The connecting conductors should not be Live when removing the meter.
Electrically Live parts are a life threatening hazard. Preliminary fuses should
be removed and kept in a safe place until all work is complete, where they
cannot be replaced by anyone unnoticed.
Proceed as follows:
Remove the company seal on the terminal cover (if fitted).
Release the two terminal cover screws and remove terminal cover.
Check with a suitable voltage testing device that the phase
connections are not live. If they are live then remove the preliminary
fuses and keep in a safe place until all work is complete, where they
cannot be replaced by anyone unnoticed.
Remove the signal inputs and outputs by releasing the auxiliary
terminal screws.
Remove the phase connections by releasing the main terminal
screws.
If required fit a suitable replacement meter as described in section
5.
8.3 Repairing the Meter
There are no user serviceable parts inside the meter. Breaking factory
calibration seals will invalidate the calibration status of the meter. In the
event of a meter requiring repair, proceed as follows.
Remove the meter from the installation as detailed in section 8.2.
Attach a label, which describes the fault as accurately as possible,
to the meter and include name and contact details of person
responsible in case of inquiries.

Measures in the Event of Faults Issue: 4 5 Page 19 of 21
5235 Single Phase Credit Meter –User Manual & Technical Specification © Landis+Gyr
Package the meter to ensure no further damage can occur during
transit.
Send the meter back to Landis+Gyr.

Page 20 of 21 Issue: 45 Decommissioning and Disposal
© Landis+Gyr 5235 Single Phase Credit Meter –User Manual & Technical Specification
9 Decommissioning and Disposal
The procedure for the safe removal of the meter from the installation is
described in section 8.3. Please ensure that ALL SAFETY PRECAUTIONS
are met before proceeding.
Based on the environmental certificate ISO 14001, the components used to
manufacture the meter can, in the main, be broken down into constituent
parts and sent for suitable recycling or disposal.
The following are general guidelines and should NOT take priority over local
disposal and environmental policies which should be adhered to without
compromise.
Component Parts
Disposal
Printed Circuit Boards
LCD Display
Treated as per disposal of Electronic Equipment
Metal Components
Sorted and delivered to collective recycling point
Plastic Components
Sorted and delivered for re-granulation if at all
possible