PCME STACK 990 User manual

- PCME STACK 990 MANUAL: 1 -
PCME STACK 990
USER MANUAL
The products described in this anual are subject to continuous develop ent and i prove ent
and it is, therefore, acknowledged that this anual ay contain errors or o issions. PCME
encourage custo er feedback and welco e any co ents or suggestions relating to the product
or docu entation. These should be forwarded to the Technical Depart ent at the address given
below.
This anual is intended as a guide to the use and installation of the product and, therefore,
PCME Ltd. shall not be liable for any loss or da age whatsoever arising fro the use of any
infor ation or details therein, or o ission or error in, this anual, or any iss-use of the
product.
PCME Ltd
Clearview Building
60 Edison Road
St Ives Cambs UK
PE2 3GH
Tel [phone]
Fax [phone]
Email: cont[email protected].uk
www.pcme.co.uk

- PCME STACK 990 MANUAL: 2 -

- PCME STACK 990 MANUAL: 3 -
1 INTRODUCTION ..................................................................................................6
1.1 P URPOSE OF THIS MANUAL ............................................................................................ 6
1.2 D ISCLAIMER ............................................................................................................. 6
1.3 P RODUCT S AFETY ....................................................................................................... 6
1.4 D ANGER FROM P ROCESS ............................................................................................... 7
1.5 L IMITS OF USE .......................................................................................................... 7
1.6 L IST OF ABBREVIATIONS ............................................................................................... 7
1.7 A SSOCIATED D OCUMENTS ............................................................................................. 7
2 PRODUCT DESCRIPTION ....................................................................................8
Process and Application Conditions ........................................................................... 8
Sensor Specification................................................................................................ 8
Sensor Options....................................................................................................... 9
Sensor Accessories ............................................................................................... 10
Control Unit Specification....................................................................................... 10
Syste Options .................................................................................................... 11
3 SENSOR INSTALLATION ...................................................................................12
3.1 S AFETY ................................................................................................................. 12
3.2 D ATA C ABLING S PECIFICATION ..................................................................................... 12
3.3 I NSTALLATION G UIDELINES ......................................................................................... 13
Location Require ents.......................................................................................... 13
Grounding of Sensor ............................................................................................. 13
Network Layout .................................................................................................... 13
3.4 F ITTING THE SENSOR TO THE STACK ............................................................................... 15
3.5 E LECTRICAL C ONNECTION ........................................................................................... 16
Cable Routing ...................................................................................................... 18
3.6 S ETTING U P ........................................................................................................... 18
Bus Ter ination Switch (SW200) ........................................................................... 18
Set address switch (SW100) .................................................................................. 19
Co unication Settings (SW101)........................................................................... 19
4 MULTI-CONTROLLER INSTALLATION (PLUS VERSION) ...................................20
4.1 S AFETY ................................................................................................................. 20
4.2 T OOLS AND M ATERIALS .............................................................................................. 21
Drilling Te plate .................................................................................................. 21
Data Cabling Specification ..................................................................................... 21
Power Supply Cabling Specification ......................................................................... 21
4.3 L OCATION R EQUIREMENTS .......................................................................................... 22
4.4 C OMPONENT L OCATION .............................................................................................. 22
4.5 I NSTALLATION ......................................................................................................... 24
Mounting the Control Unit...................................................................................... 24
Data Cable Connection .......................................................................................... 24
Bus Ter ination Switch (SW200) ........................................................................... 25
RS232/RS485 Connections (PL2) ............................................................................ 25
Digital Input Connections (PL3).............................................................................. 25
4-20 A Output Connections (PL4).......................................................................... 26
Alar Contact Connections (PL5) ........................................................................... 26
Power Supply Connections (PL6) ............................................................................ 27

- PCME STACK 990 MANUAL: 4 -
5 INTERFACE MODULE INSTALLATION ...............................................................28
5.1 S AFETY ................................................................................................................. 28
5.2 T OOLS AND M ATERIALS .............................................................................................. 29
Data Cabling Specification ..................................................................................... 29
Power Supply Cabling Specification ......................................................................... 29
5.3 L OCATION R EQUIREMENTS .......................................................................................... 29
5.4 C OMPONENT L OCATION .............................................................................................. 30
5.5 I NSTALLATION ......................................................................................................... 31
Mounting the Interface Module............................................................................... 31
Data Cable Connection .......................................................................................... 31
RS232/RS485 Connections..................................................................................... 31
Digital Input Connections ...................................................................................... 32
4-20 A Output Connections .................................................................................. 32
Alar Contact Connections .................................................................................... 32
Power Supply Connections..................................................................................... 33
6 INITIAL SET-UP ................................................................................................34
6.1 I NTRODUCTION ....................................................................................................... 34
6.2 P OWER -U P ............................................................................................................. 34
6.3 C HECKING THE C OMMUNICATIONS M ODE ......................................................................... 34
6.4 A UTODETECT S ENSORS .............................................................................................. 35
6.5 E DITING B ASIC S ENSOR S ETTINGS ................................................................................ 36
6.6 C ALIBRATION F ACTOR ............................................................................................... 37
6.7 E MISSION A LARM S ETTINGS ........................................................................................ 38
6.8 S ET T IME / D ATE ..................................................................................................... 39
6.9 4-20 M A S ETTINGS ................................................................................................... 40
Scaling and Filtering 4-20 A Outputs ..................................................................... 40
Testing and Calibrating 4-20 A Outputs ................................................................. 41
Analogue Output Modules...................................................................................... 42
Testing and Calibrating AOM 4-20 A Outputs.......................................................... 43
Setting local 990 Sensor 4-20 A Outputs ................................................................ 44
6.10 R ELAY S ETTINGS ................................................................................................. 45
Multicontroller and Interface Module Relays............................................................. 45
Relay Output Modules (ROM) ................................................................................. 47
Testing Relay Ouput Modules................................................................................. 49
Local 990 Sensor Relay Output............................................................................... 49
6.11 L OG R ATES ........................................................................................................ 51
6.12 M ORE S ENSOR S ETTINGS ....................................................................................... 51
Manually Add Sensors ........................................................................................... 52
Editing Sensor/Device Settings ............................................................................... 53
Delete Sensor/Device ............................................................................................ 53
Editing Settings for all Sensors/Devices at Once ....................................................... 54
Advanced Settings ................................................................................................ 54
QUALITY ASSURANCE AND SELF TESTS ...........................................................55
7.1 I NTRODUCTION ....................................................................................................... 55
7.2 PCME STACK 990 S ENSOR S ELF T ESTS ........................................................................ 56
Zero check and Span Checks.................................................................................. 56
Short Circuit Check ............................................................................................... 56
Conta ination Ring Check ..................................................................................... 56

- PCME STACK 990 MANUAL: 5 -
Self Test Values.................................................................................................... 56
Disabling Self Test ................................................................................................ 57
Adjusting the Conta ination Ring Check Alar Level................................................ 57
Co s Check ...................................................................................................... 58
8 MAINTENANCE MODE .......................................................................................59
9 SERVICE MESSAGES..........................................................................................61
9.1 C LEARING S ERVICE M ESSAGES ..................................................................................... 61
9.2 I NSPECTING AND C LEANING S ENSORS ............................................................................. 62
10 CALIBRATION ...................................................................................................64
10.1 I NTRODUCTION ................................................................................................... 64
10.2 C ALCULATING THE C ALIBRATION F ACTOR .................................................................... 64
10.3 C ALIBRATION P ROCEDURE ...................................................................................... 65
10.4 U SING THE C ALIBRATION T OOL ................................................................................ 66
Calculating the Calibration Factor: Manual Method.................................................... 67
Calculating the Calibration Factor: Auto atic Method................................................ 67
11 TROUBLESHOOTING .........................................................................................69
11.1 C OMMUNICATION F AILURE ...................................................................................... 69
11.2 D IAGNOSTICS ..................................................................................................... 69
11.3 C HECKING S PURS ................................................................................................ 69
11.4 990 S ENSOR P OWER C HECK ................................................................................... 69
11.5 990 S ENSOR C OMMUNICATIONS C HECK ...................................................................... 70
11.6 P OWER L OSS ...................................................................................................... 70
11.7 F ROZEN READINGS ............................................................................................... 70
11.8 S ENSOR R EADING TOO L OW OR TOO H IGH .................................................................. 71
12 MENU MAPS ...................................................................................................... 2
Main Screens ....................................................................................................... 72
Basic Sensor Setup ............................................................................................... 73
More Sensor Settings ............................................................................................ 74
Basic Syste Setup............................................................................................... 75
Other Functions.................................................................................................... 76
QA and Calibration................................................................................................ 77
Document Control Information
SOP Reference PCME STACK 990
Issue No 3
Issue Date 21/07/09
Software Version 7.00
Filena e PCME STACK 990 v3.doc

- PCME STACK 990 MANUAL: 6 -
1INTRODUCTION
1.1 Purpose of this manual
This anual contains all the infor ation necessary for correct installation and co issioning of
the instru ent. The procedures given in this anual ust only be carried out by suitable trained
and qualified personnel.
1.2 Disclaimer
PCME Ltd. will not be liable for any injury or da age caused by incorrect installation, set-up,
operation or aintenance resulting fro a failure to follow the procedures given in this anual.
1.3 Product Safety
PCME is an EN ISO 9001 accredited design and anufacturing organisation, and within the li its
specified in this anual, anufactures instru ents which confor to the essential health and
safety require ents of the following European Union directives:
Low Voltage Directive ( 3/23/EEC)
EMC Directive (89/336/EEC)
In particular, the following har onised standards have been applied:
IEC61010-1:2001
EN61326:2005
All due care has been taken in the design and anufacture of the equip ent to eet the safety
require ents of the above directives. However individuals installing, operating or aintaining the
equip ent are responsible for personal safety and for correct use of the equip ent in accordance
with the procedures detailed in this anual
The following sy bols are used throughout this anual to indicate procedures that, if not
followed correctly, ay result in injury to personnel or da age to equip ent.
WARNINGS ARE USED TO ALERT THE READER TO A PROCEDURE OR
PRACTICE, WHICH IF NOT FOLLOWED CORRECTLY, COULD RESULT IN
PERSONAL INJURY.
Cautions are used to alert the reader to a procedure or practice, which if not
followed correctly, could result in damage to the system or ancillary
equipment.
Notes are used to highlight i portant infor ation that ay assist the reader in carrying
out a procedure or in understanding the text.

- PCME STACK 990 MANUAL: 7 -
1.4 Danger from Process
It is possible that the sensors are installed in ducting containing process particulate that is a
hazard to health. This ay take one or ore of the following for s:
•Particulate which is infla able or explosive
•Particulate which is toxic or in so e other way a hazard to health
•Particulate contained within high te perature gas
Unless the process conditions are known to be entirely safe, suitable precautions such as the use
of breathing apparatus or duct purging/detoxifying ust be e ployed before any entry is ade
into the duct for installation or aintenance purposes. If in doubt, consult the local Safety Officer
and/or local Safety procedures.
1.5 Limits of use
To achieve opti u perfor ance and safe operation the equip ent ust be operated within the
li its detailed in the Product Description. Operation outside these li its ay result in da age to
the equip ent.
1.6 List of abbreviations
The following abbreviations are used in this anual:
AIM Auxiliary Input Module
AOM Analogue Output Module
PSU Power Supply Unit
ROM Relay Output Module
1. Associated Documents
Control Unit Reference Manual
Installation of Network Devices: Reference Manual
PCME Installation Notes

- PCME STACK 990 MANUAL: 8 -
2PRODUCT DESCRIPTION
Process and Application Conditions
Certification range 0-15 g/
3
(TUV)
Long ter zero drift <0.1 g/
3
Measure ent capability 0-500 g/
3
Inspection frequency 6 onths
Application conditions
For easure ent in non-condensing flue gases
For stack easure ent but not suitable for use downstrea
of electrostatic precipitators or in applications with water
droplets
Velocity dependency
For use in processes with flow over the range 8 /s-20 /s
with no restrictions. Constant velocity required outside this
range.
Stack dia eters 100 to 6 (flow profile dependent on larger stacks).
Sensor Specification
Enclosure te perature rating -25°C to +55°C
Stack te perature rating -25°C to +250°C ( options to +400°C and +800°C)
Enclosure rating IP-65
Enclosure aterial Die-cast alu iniu (polyester powder coated)
Sensor body aterial
Standard: 316 stainless steel
Passive/active: 316 stainless steel
Fully insulated: PTFE coated stainless steel
Sensor weight 1.8kg (standard)
Connection required on duct 1.5" BSP (fe ale)
Ensure opening/hole in stack wall is at least 45 dia eter
Power require ents 24V provided by the control unit
Local outputs
RS-485 connection to control unit
Optional: 4-20 A (250 Oh , non-isolated)
Optional: relay (1A @ 30V)
Cable entries 3 x M20 gland/conduit entries

- PCME STACK 990 MANUAL: 9 -
Cable type 4 core screen (see installation section for details)
Air Purge require ents
May be required on so e applications (consult PCME).
Requires optional air purge fitting and an external supply of
5-10 litres/ in of dry clean, oil free instru ent air
Sensor Options
Sensor Type options
Standard sensor
Insulated sensor
Passive/active sensor
Standard sensor
Passive/active sensor
Standard sensor
Passive/active sensor
Standard sensor
0-250°C
0-250°C
0-250°C
0-400°C
0-400°C
0-800°C
0-800°C
0-400°C 0-10bar
Rod Length options 100-1000 *
ATEX/ IECEx Category options
None (standard)
ATEX: Category 3 dust (zone 22) **
ATEX: Category 1 dust (zone 20) ***
IECEx: Category 1 dust (zone 20) ***
*li ited to 800 on 400°C, 800°C and passive/active versions
**standard 250°C and passive/active 250°C only
***standard 250°C only. Isolating spur provided with sensor.

- PCME STACK 990 MANUAL: 10 -
Sensor Accessories
Air Purge fitting Connection ¼” BSP (standard sensor)
Stack Connection options
1.5” BSP (standard)
Flange
Flanged air purge adapter
Wetted parts (Hastelloy ®) (up to 250°C)
Wetted parts (Hastelloy ®) (up to 600°C)
Local 4-20 A and Relay option 1 x 4-20 A (250 Oh , non-isolated)
1 x relay (1A @ 30V)
Control Unit Specification
Standard System PLUS System
Controller type Interface Module MultiController
No of sensor
channels 1 1 -16
ICON driven
ultilingual enus
E ission and Alar levels
Quality Assurance results
Calibration screens
Review data logs
Show graph and bar chart
Set up and password
Advanced calculations (Mass,
nor alisation)
E ission and Alar levels
Quality Assurance results
Calibration screens
Review data logs
Show graphs and ulti bar charts
Set up and password
Advanced calculations (Mass,
nor alisation)
Bagfilter
opti isation
diagnostics
Pulse log review for diagnosing
location of leaking bags
Pulse log review for diagnosing
location of leaking bags
E ission data logs
Long
Short
Pulse
Alar s
Capacity stated for 1 sensor
12 onths @ 15 inutes
7 days @ 1 inute
2 hours @ 1 second
500 entries
Capacity stated for 4 sensors
12 onths @ 15 inutes
7 days @ 1 inute
2 hour @ 1 second
500 entries
Ethernet enabled
option None Ethernet (Modbus TCP) (optional)
Outputs
1 x RS-485 (Modbus RTU)
1 x 4-20 A (500 oh )
2 x Relay (2A@250V, user
selectable)
1 x RS-485 (Modbus RTU)
4 x 4-20 A (500 oh )
4 x Relay (2A @250V, user
selectable)

- PCME STACK 990 MANUAL: 11 -
Inputs
1 input for plant off indication, bag
cleaning reference and ultiple
calibrations
4 inputs for plant off indication, bag
cleaning reference and ultiple
calibrations
Enclosure Size
(LxHxD) 220 x 123 x 80 263 x 160 x91
Power Supply 90 to 260 VAC (50/60Hz), 1A 90 to 260 VAC (50/60Hz), 1A
System Options
4-core Cable Specify length required (10 per sensor included as standard)
Spur Divides cable into 2 branches
Power supply / repeater Voltage and signal boost for extended cabling runs with
ultiple sensors
Analogue input odule (AIM) 4 x 4-20 A inputs
4 x Digital inputs
Analogue output odule (AOM) 8 x 4-20 A (500 Oh )
Alar output odule (ROM) 8 x Relay (1A @ 250V)
Isolating Spur Provides Surge protection

- PCME STACK 990 MANUAL: 12 -
3SENSOR INSTALLATION
3.1 Safety
DANGER FROM PROCESS
It is possible that the sensors are to be installed in ducting containing
process particulate that is a hazard to health. This may take one or more of
the following forms:
•Particulate which is inflammable or explosive
•Particulate which is toxic or in some other way a hazard to health
•Particulate contained within high temperature gas
Unless the process conditions are known to be entirely safe, suitable
precautions such as the use of breathing apparatus or duct
purging/detoxifying must be employed before any entry is made into the
duct for installation or maintenance purposes. If in doubt, consult the local
Safety Officer and/or local Safety procedures.
Probe Damage
Take care when handling the sensor to avoid bending or damaging the
probe. Probe damage may result in inaccurate measurements.
Supply Voltage
The sensor operates at 24V DC supplied fro the Control Unit.
3.2 Data Cabling Specification
The cabling provided by PCME has the following specification:
•2 pair (4 core), 0.5
•BS5308 part 2, type 1
•Overall tinned copper braided or foil screen
•Fla e retardant PVC outer sheath (outside dia eter 7.9 )
•Colour coding (power): blue (0v), brown (24 Vdc)
•Colour coding (co s): green (A), orange (B)

- PCME STACK 990 MANUAL: 13 -
3.3 Installation Guidelines
Location Requirements
When selecting a ounting location for the sensor the following should be taken into
consideration for opti u perfor ance:
•Mount in the longest, straightest, unrestricted duct available
•Ensure correct sensor grounding (see section below)
•Excess vibration will affect sensor readings
•Ambient or radiating temperatures in the vicinity of the mounting
location must not exceed 50°C
•Avoid excessive vibration
Grounding of Sensor
For electrodyna ic sensors it is essential the sensor body is grounded to the stack wall. Poorly
grounded sensors ay pick up external noise producing false high readings:
•It is reco ended to use a earthing strap to ensure the sensor body is fir ly grounded
to the etallic stack wall
•If you are not using an earthing strap the sensor relies on the thread or flange
connection to provide grounding
•DO NOT PUT PTFE TAPE AROUND THE THREAD
•Re ove excessive rust fro the thread and socket and apply a copper loaded grease
•If the stack if not etallic or you are concerned that the stack ay not provide a suitably
earthed shield for the sensor, then contact PCME
Network Layout
Connect ultiple sensors to the control unit either by daisy chaining or by using spurs as shown
below.
For large syste s it is best to place the control unit in the centre of the network to ini ise
voltage drop along cables.
For large syste s you ay need to boost power using a Power Supply Repeater – contact PCME
for details.

- PCME STACK 990 MANUAL: 14 -
4-core Power (24V DC)/
Comms (RS485)
115/230V AC
Figure 3-1 Standard System
115/230V AC
4-core Power (24V
DC)/ Comms
(RS485)
4-core Power (24V
DC)/ Comms
(RS485)
Figure 3-2 PLUS System (“Spur Linked”)

- PCME STACK 990 MANUAL: 15 -
Figure 3-3 PLUS System (“Daisy Chained”)
3.4 Fitting the sensor to the stack
1
2
3 4 5 8 9 10 1176
Figure 3-4 PCME STACK 990 Probe
1 Stack wall 7 Conta ination ring
2 Stack wall hole for probe (Ø at least 45 ) 8 1.5” BSP thread
3 Weld all round 9 Floating nut
4 1.5” BSP socket 10 Lock nut
5 Probe rod 11 Sensor enclosure
6 Insulator

- PCME STACK 990 MANUAL: 16 -
Fit the Sensor to the stack as follows.
Drill a hole of at least 45 in the stack where the Sensor is to be located. Fit a 1.5” BSP socket
which ust be welded all round to the stack. Ensure the BSP socket is exactly 90° to the stack or
that the probe rod points slightly down into the stack to allow condensate to drain off.
Insert the probe into the socket and secure with the floating nut. Ensure the sensor unit is
vertical with the cable entry glands at the botto and is adequately supported when tightening
the floating nut. Tighten the locking nut. When tightening the locking nut ensure the floating nut
is held securely with a wrench.
3.5 Electrical Connection
Ensure the cabling is not connected to the Control Unit power during
wiring.
Refer to Figure 3-5 for location of ter inals. After installation of the Sensor to the stack ake the
co unications and power connections as follows:
For “daisy chained” Sensor Systems
Route the input cable through the cable gland nearest to the BUS IN ter inals. Make the
connections to the BUS IN ter inals as follows fro left to right:
BUS IN TERMINAL
*Connect the cable screen to the
earth stud
Connect the next Sensor in the network to the BUS OUT ter inals. Route the cable through the
cable gland nearest to the BUS OUT ter inals. Make the connections to the BUS OUT ter inals
as follows fro left to right:
BUS OUT TERMINAL
*Connect the cable screen to the
earth stud
0V Blue
Co s B Orange
Co s A Green
24V Brown
(Screen) Do not use*
0V Blue
Co s B Orange
Co s A Green
24V Brown
(Screen) Do not use*

- PCME STACK 990 MANUAL: 17 -
Figure 3-5 PCME Stack 990 Sensor Unit
6
Conta ination probe
7 Conta ination probe enable/disable
(shown enabled)
8 4-20 A and relay outputs (option)
9 Set co s switch (SW101)
10 Earth stud (cable screen)
11 Set address switch (SW100)
1
BUS OUT
(power and co s
)
2 BUS IN(power and co s)
3 Bus ter ination switch (SW200)
4 Main probe enable/disable switch
(shown enabled)
5 Main probe

- PCME STACK 990 MANUAL: 18 -
For “spur linked” Sensor Systems
Route the input cable through the cable gland nearest to the BUS IN ter inals. Make the
connections to the BUS IN ter inals as follows fro left to right:
BUS IN TERMINAL
*Connect the cable screen to the
earth stud
The sa e connections are copied at the Spur. At the spur connect the screen to the ter inal.
Before refitting the cover the Sensor Unit ust be configured in accordance with the Setting Up
instructions.
Cable Routing
When routing cables observe the following:
•Ensure the cable sheath penetrates the Sensor Unit entry gland
•Fit blanking plugs to unused cable entry glands
•Ensure cable entry glands are tightened to the cable
•Support cables at appropriate intervals
•Do not route cables over roofs
3.6 Setting Up
Refer to Figure 3-5 for the location of the set-up switches.
Bus Termination Switch (SW200)
The Bus Ter ination Switch (SW200) identifies the sensor’s position in the network. Set the
switch to “U” for all sensors in the chain except the last sensor, which ust be set to T. For spur-
syste s leave all sensors ter inated (switch to “T”).
0V Blue
Co s B Orange
Co s A Green
24V Brown
(Screen) Do not use*

- PCME STACK 990 MANUAL: 19 -
Set address switch (SW100)
Each sensor ust have a unique address on the network. The address is set by eans of the DIP
switch (SW100). Only switch positions 1 to 6 are used giving valid address settings fro 1 to 64.
The illustration above shows address 5. The address switch uses binary coding to calculate the
required address.
For exa ple, to set address nu ber 5: Set switch 1 (binary 1) ON and switch 3 (binary 4) ON (4
+ 1 = 5).
Communication Settings (SW101)
The sensor has two co s settings, ASCII and RTU. The default setting is ASCII: 19200 Baud,
No Parity, 1 Stop Bit, ASCII ode (7-bit). The DIP switch should be set as follows:
RTU is a faster co unications protocol but is not available for all devices; refer to the Control
Unit Reference Manual. If RTU ode is required set the DIP switch as follows:
Refit the Sensor Cover and secure with the four screws. Do not over tighten the screws.

- PCME STACK 990 MANUAL: 20 -
4MULTI-CONTROLLER INSTALLATION (PLUS VERSION)
This section provides infor ation on installing and setting up a MultiController used in the PLUS
version.
4.1 Safety
HAZARDOUS VOLTAGES
THIS EQUIPMENT CONTAINS LETHAL VOLTAGES (100-240VAC 50/60HZ).
DO NOT REVERSE LIVE AND NEUTRAL.
THE NEUTRAL LINE IS NOT FUSED.
HAZARDOUS VOLTAGES
SWITCH OFF AND ISOLATE THE UNIT POWER SUPPLY BEFORE REMOVING
THE FRONT COVER.
HAZARDOUS VOLTAGES
A SUITABLE APPROVED AND RATED ALL POLE DISCONNECT DEVICE MUST
BE INSTALLED IN THE BUILDING INSTALLATION IN A READILY
ACCESSIBLE POINT NEAR THE CONTROLLER. THE CONTACT GAP OF THE
DISCONNECT DEVICE MUST BE AT LEAST 3.0MM. THE CONTACTS SHOULD
BE RATED AT LEAST 240VAC 1AAC
HAZARDOUS VOLTAGES
HAZARDOUS VOLTAGE ARE STILL PRESENT WHEN THE MAIN POWER
SUPPLY FUSE HAS FAILED
EARTHING
THIS EQUIPMENT MUST BE EARTHED
NO User Serviceable parts within.
If the equipment is used in a manner not specified by the manufacturer, the
protection provided by the equipment may be impaired.