the Guardian NG User Manual
Contents
1. 19 4 2 GETTING INSIDE THE GUARDIAN 20 4 3 REMOVING THE MOUNTING PLATE 6 21 4 4 2 gane E veel aerea aga 22 4 5 22 terc ura erre ee eua 22 4 6 CLEANING EcL 22 5 PEE 23 5 1 CALIBRATION GAS 23 5 2 CONNECTING CALIBRATION GAS TO THE GUARDIAN 23 5 3 EFFECTS OF PRESSURE ON 24 5 4 CALIBRATION CHECKING PROCEDURE 00c0ccccceeeeeeeeeeeceeeeeceuueeseceeeeseeauaaeeseeeeeesananees 25 5 5 CALIBRATION PROCEDURE SEE ALSO 3 1 1 sse 25 6 TROUBLE RR 44 R4 RS Aa AR 27 6 1 ERRORS amp FAULT INDICATIONS FROM THE FIRMWARE 27 7 SAFETY amp SYSTEM INTEGRITY ausa sa mamas aa aa RR sana nnn 29 7 1 TOXIGGASES A Me NM sa 30 8 2 2 oon arn 31 0 GLOSSARY2. 32 10 de 33 11 ACCESSORIES AND SPARE PARTS 34 12 WARRANTY 35 13 CEMARK DETAIL 36 14 DOCUMENT CHANGE 37 cv cust uU 38 APPENDIX 39 Contents List of Figures Figure 1 Power Connection and Current Output 3 Figure 2 Alarm and Fault Relay Terminals 4 Figure 3 Guardian NG Front Panel 5 Figure 4 VALUE mode nnns 6 Figure 5 SETUP mode 7 Figure 6 SETUP mode with High Alarm selected 7 Figure 7 High Alarm 8 Figure 8 High Alarm Set Value 5 8 Figure 9 LCD settings screen 10 Figure 10 Set password screen 11 Figure 11 Resolution Screen 13 Figure 12 Graph 14 Figure 13 Graph settings menu 0 0 0
3. 10 Procedure 6 Setting the password sse entere enne 11 Procedure 7 Setting the Screen 13 Procedure 8 Returning the unit to factory default settings sese 13 Procedure 9 Replacing the ene nnns 20 Procedure 10 Opening the Guardian NG 20 Procedure 11 Removing the 21 Procedure 12 Replacing the 22 Procedure 13 Replacing the 22 Procedure 14 Cleaning the 22 Procedure 15 Connecting calibration gas to the Guardian 23 Procedure 16 Checking the 25 Procedure 17 Calibrating the Guardian NG 26 Edinburgh Sensors 2 Bain Square Kirkton Campus Livingston EH54 7DQ UK T 44 0 1506 425300 44 0 1506 425320 E gassensor edinst com W www edinburghsensors com Section 1 Introduction 1 Introduction The Guardian NG wall mounted monitor provides continuous analysis of gas concentration levels t can sample the gas either next to the monitor or from sampling points up to thirty metres away using the integral sampling system It features comprehensive output alarm and fault indications via the on board microcontroller The Guardian NG is based on dual wavelength non disp
4. 14 Figure 14 Analogue Output Terminals 16 Figure 15 BESWIC ose ees eode tx entia e ea deep ere Rees 17 Figure 16 Guardian NG Internal 19 Figure 17 Connecting the calibration gas to the Guardian NG 24 List of Tables Table 3 1 Recommended and highest resolution 12 Table 3 2 Analogue output 16 Table 3 3 Guardian self test and warm up sequence 17 Table 3 4 Relay contact switching enn 18 Table 3 5 Voltage limits 18 Table 41 Fuse detalls 22 Table 6 1 Troubleshooting problems and solutions 28 Table 7 1 Gas Hazards ike esee 29 Table 7 2 Gas toXIGIty ete EE a eC da eet em ku edet 30 Table 8 1 Specifications irit rai a ld eruta i ee 31 List of Procedures Procedure 1 Positioning the nennen nnne enne 2 Procedure 2 Setting the High Gas Concentration Alarm nenene nnnenn nenene 8 Procedure 3 Setting the Idle Polarity sse 9 Procedure 4 Setting the low gas concentration alarm sess 9 Procedure 5 Setting the LCD contrast
5. PRESSURE 1013 0 VALUE HS TP Figure 4 VALUE mode screenshot In VALUE mode the display shows the following options are available for the navigation buttons e Graph Value e Setup If the navigation button beneath any of these options is pressed further options are revealed These can be accessed through the menu system described below If the navigation button on the right is pressed when the display is as shown in Figure 4 the SETUP menu will be revealed and so is referred to as the SETUP button Note Low range instruments will show the concentration in parts per million ppm and not as a percentage 3 1 1 VALUE Mode When in VALUE Mode pressing the VALUE button the central navigation button will open the calibration mode The four calibration buttons ZERO and SPAN may then be used to adjust the calibration using the procedure described in Procedure 17 Calibrating the Guardian NG Issue 1 v05 14 May 14 Page 6 of 40 Operation 3 1 2 SETUP mode When in VALUE mode pressing the right most of the three navigation buttons will open the SETUP mode The SETUP mode has six options Set Alarm High Set Alarm Low LCD Settings Set Password Resolution Load Defaults As shown in Figure 5 below It SET ALARM HIGH lf SET ALARA Lou LCD SETTINGS PASSWORD 42 RESOLUTIOH f LOAD DEFGULTS ANLE Figure 5 SETUP mode Screenshot Pressing the right most of
6. 1 D D 1 1 i D i PASSWORD t DISABLE i 1 1 1 1 1 i i D 1 1 PHD C LELLLRLL 1 WIN C ENABLE Mt SET ALARM HIGH 7 ION NENNEN SET ALARM LOW LCD SETTINGS SET PASSWORD LOAD DEFAULTS CENTER STEP 0 1 i i i i i i i i i i i i i 1 i i 1 1 i RESOLUTION CONTRAST 22 i i i i i i i i i i I 1 EE Issue 1 v05 14 May 14 Page 38 of 40 Appendix B Guardian NG Mounting Drawing Appendix STORES NO 157 114 NOTES 1 TOLERANCES TO APPLY AFTER ANY PLATING 2 REMOVE ALL BURRS AND SHARP EDGES THE COPYRIGHT IN THIS WORK IS VESTED IN EDINBURGH INSTRUMENTS LTD AND THIS DOCUMENT 15 ISSUED IN CONFIDENCE FOR THE PURPOSES ONLY FOR WHICH IT IS SUPPLIED IT MUST NOT BE REPRODUCED WHOLE ORIN PART OR USED FOR TENDERING OR MANUFACTURING PURPOSES EXCEPT UNDER AGREEMENT OR WITH THE CONSENT IN WRITING OF EDINBURGH INSTRUMENTS LTD AND THEN ONLY ON THE CONDITION THAT THIS NOTICE IS INCLUDED IN ANY SUCH REPRODUCTION 256 ANGLE PROJECTION 16 5 5 SLOTS IE 5 N 0 0 1 2x 53 SLOTS 242 DIMENSIONS IN MM ORIGINALSCALE 1 2 RST EDINBURGH INSTRUMENTS LTD CHECKED MATERIA
7. 2 EDINBURGH SENSORS A Division of Edinburgh Instruments Guardian NG Infrared Gas Monitor User Guide Edinburgh Instruments 2 Bain Square Kirkton Campus Livingston EH54 7DQ UK T 44 0 1506 425300 F 44 0 1506 425320 E gassensor edinst com W www edinburghsensors com Copyrights Copyright 2013 Edinburgh Instruments Ltd All rights reserved No part of this publication may be reproduced stored in a retrieval system or transmitted in any form or any means electronic or mechanical including photocopying and recording for any purpose other than the purchaser s personal use without written permission The product described in this manual is subject to continuous development and while every effort has been taken to make sure that the information given is correct Edinburgh Instruments Ltd cannot accept any liability for errors and omissions or their consequences Guardian Infrared Gas Monitor Issue No 1 v05 14 For systems delivered after May 2014 Firmware Version 1 16 or Later Edinburgh Instruments Ltd 2 Bain Square Kirkton Campus Livingston EH54 7DQ Phone 44 0 1506 425300 Fax 44 0 1506 425320 email gassensor edinst com http www edinst com The Guardian is not suitable for the detection flammable gases mixtures of gases that are flammable or may become flammable if mixed with Air If you are unsure about the properties of the sample gas
8. This brings up the set alarm low menu shown in Figure 7 4v To set the value at which the alarm is activated use the right hand navigator button to highlight the SET TO option then press the central EDIT button 4vi The central and right hand and buttons now enable the limit to be Issue 1 v05 14 May 14 Page 9 of 40 Operation changed in 5 steps This display screen is shown in Figure 8 4vii In order to set the alarm such that it is activated when the gas concentration is below the low set point it is necessary to change the idle polarity see 3 1 5 3 1 7 LCD settings screen The LCD SETTINGS menu is used to adjust LCD display contrast To open the LCD SETTINGS menu highlight the LCD SETTINGS option in the SETUP menu see Figure 5 and select by pressing the ENTER button Figure 9 below shows the display with the LCD contrast value selected for setting The and buttons allow value of the display contrast to be adjusted for best visibility DC OHTRAST 22 Figure 9 LCD settings screen Procedure 5 Setting the LCD contrast 51 While in the VALUE mode shown in Figure 4 the default mode after switch on press the right hand navigator button the SETUP button This brings up the menu as shown Figure 5 5iii Press the right hand navigator button to access the menu Use the right hand button labelled with an arrow to scroll through the menu Highl
9. style is selected pressing the style button again shows the currently selected style is displayed along with and button options Pressing the or buttons scrolls through the available options Available Graph styles are Dots e Lines joined dots e Filled everything below the measurement line is filled black The required option is selected by pressing the BACK button while it is displayed The display may be returned to the top level menu by pressing the BACK key repeatedly if necessary Issue 1 v05 14 May 14 Page 15 of 40 Operation 3 2 Analogue Output The analogue output is a current source and may be used to connect to external indication control or data logging devices The output can be configured to provide a 4 20 mA linear 0 20 mA linear output using the options bit switch on the main PCB The analogue output is accessed by removing the terminal cover and is located on the left side of the case see Figure 1 above and Figure 14 below The terminals are from left to right output and zero volts labelled O P and OV respectively in Figure 14 ANALOGUE OU O P 0V Figure 14 Analogue Output Terminals The output has two settings 4 20 mA and 0 20 mA The options for these settings are shown in Table 3 2 Output Setting 4 20 mA 0 20 mA Zero Reading 4mA 0 mA Span Reading 20 mA 20 mA Max over range 25 5 mA 22 Max Under range 3 mA NA Fault Con
10. close to Zero Span Calibration Failed value during Span Calibration Restart the board and re calibrate Zero gas first 11 Sum of coefficients not equal to 1 Check stored coefficient values 12 Flow fault Check the pump and pipe work for blockages or faults Table 6 1 Troubleshooting Issue 1 v05 14 May 14 problems and solutions Page 28 of 40 7 Safety System Integrity 7 Safety amp System Integrity Gas vented from the Guardian NG monitor is usually released in to the surroundings If this presents a hazard particularly to personal safety the gas should be vented safely by attaching suitable tubing to the outlet nozzle see section 2 3 Components of the sampled gas including those not measured by the Guardian NG should be assessed for toxicity flammability risk of explosion and asphyxiation as well as any hazards specific to the installation biological nuclear etc The gases which can be measured by the Guardian NG present the following hazards Hazard Carbon Dioxide Asphyxiant 0 596 8 Hour Exposure Limit 5 Lower Explosive Limit In Air Table 7 1 Gas Hazards The Guardian NG performs continuous self checking If a fault is detected the audible alarm sounds and the fault is indicated on the front display panel In addition the fault relay is depowered and the analogue outputs are forced into a state dependant on the bit switch options so that ext
11. for all calibration operations WARNING Never connect gas cylinders even with regulators or other pressurised gas sources directly to the instrument as the pressure may damage the monitor 5 2 Connecting Calibration Gas to the Guardian NG Procedure 15 Connecting calibration gas to the Guardian NG 15 i To connect gas to the Guardian NG supply the gas to the instrument via a pipe with a T Piece and a one metre pipe running off and venting to atmosphere See Figure 17 This prevents overpressure being applied to the unit and allows the pump in the Guardian NG to draw in the required gas flow with the excess venting off The one metre line is necessary to prevent back flow of air into the system 15i sure that there is a positive outflow at the vent pipe either manually with a wet finger or with a flow meter Issue 1 v05 14 May 14 Page 23 of 40 Calibration Monitor T Piece Regulator 1m of Tubing Positive Outflow of Gas Cylinder Figure 17 Connecting the calibration gas to the Guardian NG 5 3 Effects of Pressure on Calibration Because gases are compressible there are various ways of expressing the gas concentration volume percent partial pressure density mole density Infrared gas analysers operate by measuring the amount of infrared energy absorbed by the gas and this is fundamentally related to the mole density the number of molecules in the beam path Most users cal
12. requirements for electrical equipment for measurement control and laboratory use Page 36 of 40 14 Document Change History 14 Document Change History ECN DATE ISSUE Original April 2012 1 v04 12 May 2012 1 v05 12 January 2013 1 v01 13 March 2013 1 v03 13 7293 May 2014 1 v05 14 Issue 1 v05 14 May 14 Page 37 of 40 Appendix 5 2 MIN LOG 2 MIN LOG i i 98 B 55 i 5 gt i CRESOLUTIOH S i i i 2 22 52 1 fe 1 N SHITCH ENABLED gt PRESSURE 1013 0 HPA k SPON i ESET ALARM HIGHEEEN SET ALARM ALARM LOU SETTINGS SET 957 SET TO 24 9 SET PRSSUORD IDLE POLARITY IILE POLARITY 27 Lond DEFAULTS 5 52 Gow 1 WES CENTER Em Iu ENABLE I eo H set pL aR High 1 SET ALARM HIGH 2 ALARN LOW Q9 Sw SET PASSWORD 92 DEFAULTS LOAD DEFAULTS WIN CENTER Em SET ALARM HIGH I4 SET ALARM LOW LCD SETTINGS Mp SET PASSWORD 1 1 RESOLUTION LOAD DEFAULTS WIN CENTER 218 SETUP
13. seek professional advice regarding the suitability of the Guardian NG for your application The Guardian NG s sampling system is NOT hermetically sealed and will leak small quantities of the sample gas in to its enclosure Gases such as Carbon monoxide and Hydrogen sulphide are extremely TOXIC and so potentially harmful levels may build up inside the enclosure The exhaust from the Guardian NG is potentially toxic and should be disposed of safely If you are unsure of the risks seek professional advice regarding your intended use Contents 1 INTRODUCTION etm 1 2 INSTAL AT ON ERE EE 2 2 1 MECHANICAL INSTALLATION 2 2 2 ELECTRICAL INSTALEATION reed erar irat 2 2 3 GAS GONNECTION EE AEEA EEA 4 3 E E E E A PP 5 3 1 FRONT DISPLAY 322 lve c eee een 6 3 2 cett tuo SE a 16 3 3 POWER ON SELF TEST SEQGUENGE a tet eec niea aedes 17 3 4 RELAY OUTPUTS e sto ciet eb e esie 17 3 5 MAINS VOETAGE 1 55 1 ofer hi 18 4 MAINTENANCE 4 19 4 1
14. the three navigation buttons still labelled SETUP you access the menu and this allows you to scroll down through the options using the navigation button beneath the down arrow button I SET ALARA HIGH SET ALARA Lou LCD SETTINGS PASSWORD 42 REZOLLITIOH LOAD DEFGULTS BW E Figure 6 SETUP mode with High Alarm selected Screenshot The BACK button takes you back to the setup menu the ENTER middle button will display the available options menu for the selected setting and the down arrow allows you to scroll down the selected settings The functions available as options in the SETUP menu are described below SET ALARM HIGH This allows you to set the value at which the high gas concentration alarm is activated See 3 1 4 for more details SET ALARM LOW This allows you to set the value at which the low gas concentration alarm is activated See 3 1 6 for more details LCD SETTINGS This allows you to adjust the contrast of the display See 3 1 7 for more details SET PASSWORD This menu allows the enabling disabling of the password and allows the password to be changed LOAD DEFAULTS Loads the default values for the graphic display See Procedure 8 for more details Issue 1 v05 14 May 14 Page 7 of 40 Operation 3 1 3 Set High Alarm Menu To set the high alarm you need to Highlight the SET ALARM HIGH line in the setup menu and press ENTER This will take you to the SET ALARM
15. HIGH menu shown below ENN E ALARM HIGHENEN ZET TO 351 POLARITY LED OFF C SWITCH JE 28 Figure 7 High Alarm Enable Disable The alarm can be set to be active above or below the set point When the IDLE POLARITY is set to LED OFF and the gas concentration is below the set point the LED and relay are unpowered P connected to T1 as shown in the graphic display When the gas reading exceeds the set point the LED is lit and relay is powered P connected to T2 The bar connecting T1 to P in the graphic display above indicates the relay connection in the non alarming state 3 1 4 Set High Alarm Value screen The first menu option allows you to set the value of the high alarm The set point is given in percent of the span of the unit To set the value highlight the numerical value box and press EDIT Figure 8 below shows the display with the value box selected for setting ENN F I ALARM HIGCHENN SET TO IDLE POLARITY LED lub ii Figure 8 High Alarm Set Value screen Procedure 2 Setting the High Gas Concentration Alarm Summary 2i While in the VALUE mode shown in Figure 4 the default mode after switch on press the right hand navigator button the SETUP button 21 This brings up the menu as shown in Figure 5 2iii Press the right hand navigator button to access the menu Figure 6 Use the right hand button labelled with an arrow to scr
16. L me GUARDIAN NG FNSH MOUNTING DETAILS APPROVED DRG No SHEET 1 OF SHEETS A 281013 ISSUE DATE No 35 00118 Issue 1 v05 14 May 14 Page 39 of 40 TEST CERTIFICATE Jork EMC Services Ltd YORK EMC SERVICES 2007 Ltd 1 DONIBRISTLE INDUSTRIAL PARK DUNFERMLINE FIFE KY11 9HZ TEL 01383 825057 FAX 01383 825396 UKAS Testing Number 1574 Edinburgh Instruments Ltd Order Nos 2 Bain Square 0000160985 0000161363 Kirkton Campus Livingston EH54 7DQ Electromagnetic Compatibility Test s were performed on the apparatus as detailed Guardian NG Gas Sensor wemme Nw Sume Configuration The EUT was powered from 230 50Hz mains supply Mode of Operation Date received 7 February 2011 7 February to 16 March 2011 Specification s EN50270 2006 Electromagnetic Compatibility Electrical apparatus for the detection and measurement of combustible gases toxic gases or oxygen Tested at Type 1 levels The apparatus to which this certificate relates was tested against the above specifications Full results are retained on file at the Test Centre Donibristle The apparatus was found to be compliant to the above specifications subject to the following conditions UKAS Accreditation Tests marked Not UKAS Accredited in thes certificate are not included in the UKAS Accreditation Schedule for our lab
17. This brings up the menu as shown in Figure 5 Press the right hand navigator button to access the menu Figure 6 Use the right hand button labelled with an arrow to scroll through the menu Highlight either SET ALARM HIGH or SET ALARM LOW depending on whether you want to change the idle polarity for the high or low gas concentration alarm then press the central ENTER button This brings up the set alarm menu 3v Use the right hand navigator button to select IDLE POLARITY in the menu then use the central SWITCH button to change the polarity 3 1 6 Set Low Alarm Menu To set the options for the low alarm select SET ALARM LOW from the settings menu then proceed as for setting the high alarm described above Note The default Idle Polarity setting is LED ON for both high and low alarms so that both alarms are activated when the indicated concentration drops below the alarm set value Both alarms are in the T1 connected to P condition when the unit is de powered Procedure 4 Setting the low gas concentration alarm 4i While in the VALUE mode shown in Figure 4 the default mode after switch on press the right hand navigator button the SETUP button 4ii This brings up the menu as shown in Figure 5 Press the right hand navigator button to access the menu Figure 6 4iv Use the right hand button labelled with an arrow to scroll through the menu Highlight SET ALARM LOW then press the central ENTER button
18. and transfer neoprene pipes to the new pump inlet and outlet are marked on pump by arrow heads inlet outlet the outlet should be connected to the sensor head 13iv Reverse steps 2 and 1 to complete the replacement 4 6 Cleaning Procedure 14 Cleaning the monitor 14i The exterior of the case may be cleaned using a soft cloth moistened in water to remove smudges and dust 14ii For more persistent marks a soft cloth moistened in isopropyl alcohol may be used 141 use of more aggressive solvents or abrasive cleaners is not recommended Issue 1 v05 14 May 14 Page 22 of 40 Section 5 Calibration 5 Calibration The Guardian NG is inherently stable and will maintain its calibration over extended periods with minimal maintenance In normal use the calibration should be checked every 12 months Any adjustment should be small 5 1 Calibration Gas Accuracy In order to check or adjust the calibration of the Guardian you must supply gas of a known composition to the instrument The accuracy of the gas used governs the accuracy of the calibration Factory calibrations are performed with gas analysed to 2 of value with a value of 2 which is the highest standard available commercially For gas mixtures supplied in small disposable canisters the best available analysis is 5 Lower grades are available up to 20 accuracy at lower cost we recommend that the best available analysed gas mixtures are used
19. applications From the SETUP menu see Figure 6 using the down arrow button ES select the RESOLUTION option and press the enter button The display will change to look like the example in Figure 11 Issue 1 v05 14 May 14 Page 12 of 40 Operation 1014 STEF 0 1 ee _ Figure 11 Resolution Screen Note The accuracy of the gas monitor does not change only the display resolution Pressing the BACK button returns the display to the SETUP menu Procedure 7 Setting the Screen Resolution 7i Tii 7 7 7 While in the VALUE mode shown in Figure 4 the default mode after switch on press the right hand navigator button the SETUP button This brings up the menu as shown in Figure 5 Press the right hand navigator button to access the menu Use the right hand button labelled with an arrow to scroll through the menu Highlight RESOLUTION then press the central ENTER button This brings up the resolution screen shown in Figure 9 in its percentage mode If the gas concentration is low it will show in parts per million ppm Use the central and right hand buttons labelled and to adjust the Resolution The percentage options are increments of 0 0596 0 0196 or 0 00196 of the span The parts per million options are increments of 5 ppm 1 ppm or 0 1 ppm 3 1 10 Default values The default values option allows the settings to be returned to the standard factory settings From t
20. as Inlet Relay Terminals Am Figure 16 Guardian NG Internal View 4 1 Filter Replacement Issue 1 v05 14 May 14 Page 19 of 40 Maintenance amp Service Procedure 9 Replacing the filter 9 i Unscrew the knurled gas inlet filter housing Shown in Figure 16 to access to the particle filter capsule 9 ii Remove the used filter capsule twist and pull and replace it with a new capsule then re fit the filter housing A spare filter capsule including integral seal is provided with each monitor Further replacements can be purchased from your supplier quoting part number 99000 capsules without integral seals must not be used 4 2 Opening the Guardian NG Procedure 10 Opening the Guardian NG enclosure 10i Switch off and isolate the mains supply to the instrument including supplies associated with the relay outputs 10ii Remove the Terminal Cover by removing the two retaining screws and disconnecting the sounder from the Relay PCB by unplugging it 101 Remove the screw covers in the corners of the front panel to reveal the retaining screws 10ivy Remove the four screws which secure the front display control panel retain screws for refitting Lift away the front panel by gently pulling on the sides The electronics behind the front panel are connected to the main PCB by ribbon cables 10v Detach the two ribbon cables from the front panel PCB WARNING Do not operate the unit without a filter as this may c
21. ause permanent damage to the sensor Issue 1 v05 14 May 14 Page 20 of 40 Maintenance amp Service 4 3 Removing the Mounting Plate Removal of the front panel allows access to the other PCB s sufficient to perform most service operations primary fuse replacement pump replacement secondary filter replacement For more major repairs it may be necessary to remove the main mounting plate see Figure 16 WARNING This monitor operates from the mains electrical supply between 90 VAC and 260 VAC Take care to avoid electric shock Procedure 11 Hemoving the mounting plate 11i Check that the mains supply is switched off and isolated Remove the terminal compartment cover and disconnect all connections to the terminal blocks taking note of connections for re fitting later 11ii Disconnect the connections between the AC power PCB and the PSU taking note of connections for re fitting later 11iii Disconnect the two neoprene pipes between the PCB and the enclosure gas inlet to pump and flow sensor to exhaust 11iv Disconnect the ribbon cables from the main PCB to the relay PCB by pulling the connector from their sockets 11v Disconnect the pump from the relay PCB by unplugging the connector from the relay PCB 11vi Remove the 5 screws around the edge of the mounting plate retain screws and washer for refitting Slide the mounting plate out by lifting out the top edge first To refit reverse the above p
22. being returned directly to Edinburgh Instruments Ltd please contact out Sales Department for an RMA number Returned Materials Authorisation which will ensure that your equipment is dealt with promptly by our service department shipments must be pre paid properly packed insured and clearly labelled with the RMA number NOTE If the equipment to be returned has been in contact or used with a substance hazardous to health covered by COSHH regulation Edinburgh Instruments Ltd must be notified in advance as this could constitute a health risk hazard to our personnel Issue 1 v05 14 May 14 Page 35 of 40 13 CE Mark Details 13 CE Mark Details The Guardian NG unit has been CE marked to indicate compliance with all essential requirements of the Directives referenced 2006 95 EC 2004 108 EC Conforms with the safety objectives of the Low Voltage Directive and its amending directives Conforms with the essential requirements of the Electromagnetic Compatibility Directive its amending directives The Guardian NG is intended for use in commercial and light industrial environments and the following standards have therefore been applied BS EN 50270 2006 BS EN 61000 6 3 2007 BS EN 61010 1 2010 Issue 1 v05 14 May 14 EMC immunity for residential commercial and light industrial environments EMC emission standard for residential commercial and light industrial environments Safety
23. bserved in the installation of this equipment The electrical installation should only be performed by a suitably qualified electrical engineer The cable glands provide both cable restraint and sealing They should only be used with circular cables in the range 8 to 10 mm diameter Check that the glands are tight after installation and that the cables are restrained f the Guardian is to be connected to a standard mains outlet a fused plug fitted with a 3 A fuse should be used f the Guardian is to be connected into the permanent wiring system of the building connection should be made using suitable cable to a switched connection unit which includes a 3 A fuse The switch must be within easy reach of the monitor and should be marked as the disconnection device for the monitor The switch must disconnect all mains power to the Guardian NG including power to the output relay contacts A cable gland is provided at the left hand side of the terminal compartment for the mains supply The mains supply voltage must be in the range 90 260 VAC see rating plate on the side of the case The power terminal block connections are marked L for the live connection N for the Neutral connection and G for the Earth Issue 1 v05 14 May 14 Page 2 of 40 Installation connection See Figure 1 below 1 Cs ANALOG O P EDINBURGH INSTRUM Figure 1 Power Connection and Current Output Terminals Conne
24. ctions from the relays to remote equipment are made from connections at the right hand side of the terminal compartment a cable gland is provided for these outputs Should mains voltages or other hazardous voltages be applied to the relays the wiring should be separated from any low voltage wiring to the analogue output These should also use a separate cable gland Connections should not be made between the mains terminal block and any other terminals within the terminal compartment CAUTION Under no circumstances should mains voltages be applied to the analogue output as this will both damage the equipment and cause a safety hazard There are three relay outputs available on the Guardian NG labelled from left to right Fault Alarm Low and Alarm High Each relay output terminal block has three terminals which are from left to right Normally Open Common and Normally Closed labelled T2 P and T1 in Figure 2 below A fault is indicated when FAULT relay is de energised disconnected from the power source causing the P terminal to be connected to the T1 terminal For alarm relay indications see section 3 Operation Issue 1 v05 14 May 14 Page 3 of 40 Installation Figure 2 Alarm and Fault Relay Terminals 2 3 Gas Connection Remote sampling may be performed by connecting up to thirty metres of 5 mm bore tubing to the gas inlet The monitor application and the environmental conditions in which the monitor is to be operated sho
25. dition 0 mA 25 5 mA Table 3 2 Analogue output options The output over ranges with reduced accuracy up to 25 5 mA 4 20 mA or 22 mA 0 20 mA The guaranteed output drive capability is 11V giving a recommended maximum load of 430 for full analogue output functionality A 500 load may be used to achieve a 0 10 V output however the 11V limit means the fault indication on the 0 20mA setting 25 5 mA is not available Under open circuit conditions the output may rise to 12 5 V maximum The current loop output mode is set by bit switch 5 on the main PCB to either 4 20mA default or 0 20mA see Figure 15 below In the Guardian NG switches 1 to 4 have no function and must be left in the off position Issue 1 v05 14 May 14 Page 16 of 40 4 20mA STD 684 JON W 1m ON 288 411 5 4 W N Figure 15 Un amp Whe filtering Bit switch 3 3 Power On Self Test Sequence Not used set to off Not used set to off Not used set to off Not used set to off 4 20mA 0 20mA current output STD adaptive filtering Operation RC When power is connected to the Guardian NG it performs a self test and warm up sequence as follows Time Display Alarm Buzzer Alarm Fault Analogue Analogue Lights Relays Relay out mA out V 0 10 Blank Off Off Off Off undefined undefined seconds 10 20 Starting Dependent Off Depe
26. eration The operation of the Guardian NG is described in terms of the outputs the inputs and the controls The outputs are display LED indicators analogue output alarm and fault relays inputs are gas sensor flow sensor fault detection system and the controls are menu controlled navigation keys calibration adjustment switches and the menu options The function of the equipment is controlled by the menu system which allows the user to select the various output options Guardian NG x CO MEN Alarm High x PRESSURE 1013 0 HPA Ala laa VALUE ZERO SPAN EDINBURGH SENSORS Calibration Figure 3 Guardian NG Front Panel The front panel of the Guardian NG shown in Figure 3 above consists of a display window three navigation buttons 2 four calibration adjustment buttons two alarm LEDs and a fault LED The functions of the navigation buttons 2 are displayed on the bottom line of the graphic display These labels will change depending on where the user is on the navigation tree A guide to the navigation of the menu system is given below Issue 1 v05 14 May 14 Page 5 of 40 Operation 3 1 Front Panel Display Menu The default mode after the start up is the VALUE mode It displays the name or chemical formula of the gas whose concentration is being indicated the indicated concentration and the pressure in the sampling cell See Figure 4 below E 02 _____
27. ernal equipment can detect the fault and take the appropriate action See section 2 2 for further details If the Guardian NG is used with external equipment to provide a control or alarm function the user should ensure that the equipment and wiring make use of the fault annunciation facility so that the system responds appropriately to a fault condition Catastrophic faults in the Guardian NG may mean that a fault is not indicated this should be considered by the user in the system design Issue 1 v05 14 May 14 Page 29 of 40 7 1 Toxic Gases Where gas sensors or gas monitor equipment is used with atmospheres which contain asphyxiant toxic or explosive gas components it is the responsibility of the user installation engineer to investigate and to execute all appropriate measures necessary to eliminate the risks to health resulting from the use of this equipment or resulting from a leak or fault created within or through the use of the equipment Limit Gas Hazard Carbon Asphyxiant 0 596 8 Hour Exposure Limit Concentrations of 10 100 000 ppm or more can produce unconsciousness or death 596 Lower Explosive Limit In Air Carbon Lethal at 1 Monoxide 8 Hour Exposure Limit 50ppm Short Term Exposure Limit 300ppm Table 7 2 Gas toxicity Issue 1 v05 14 May 14 Page 30 of 40 Section 8 Specification 8 Specification Ranges Alarm Ranges zero to full sca
28. ersive infrared NDIR technology It offers reliable high performance operation while requiring low maintenance Main features Display LCD Current analogue output 2 independent alarm set points with volt free relay contacts Internal self test with volt free fault relay contacts Audible and visual alarm and fault indication Internal pump Low flow sensor Enclosure protection to IP54 Easily replaceable particle filter Output options configured by user from display Issue 1 v05 14 May 14 Page 1 of 40 Section 2 Installation 2 Installation The Guardian NG should be mounted on a vertical surface using three M4 machine screws or No 8 wood screws When choosing a site ensure there is plenty of space around the monitor especially at the base This is to allow the terminal compartment cover to be opened and enable all cables and tubing to be connected 2 1 Mechanical Installation Procedure 1 Positioning the monitor 1i Select a suitable location for the monitor fit the top centre screw hang the unit from the central fitting at the top 11 Remove the terminal compartment cover to reveal the slotted fixing holes and mark suitable positions for the two securing screws 1 iii Remove the Guardian NG and drill holes for the two securing screws 1iv Hang the Guardian NG back on the central screw and secure it through the slotted holes 2 2 Electrical Installation The following precautions must be o
29. evel switching or high power switching applications However if the relays are used in power switching applications they should not subsequently be used to switch low level signals as arcing may have damaged the gold plating The relay contacts are designed to switch the following resistive loads mains power switching 8A 250 maximum DC power switching 8A 30 VDC maximum Table 3 4 Relay contact switching loads For other voltages the following limits should be observed maximum switching voltage 260 VAC 150 VDC 8 A at 250VAC 8A at 30VDC maximum switching current Table 3 5 Voltage limits Life expectancy normally 100 000 operations of the relays will be reduced if used to switch inductive loads 3 5 Mains Voltage The Power supply in the Guardian NG accepts input voltages between 90 and 260 VAC This should be compatible with most mains supplies encountered Issue 1 v05 14 May 14 Page 18 of 40 4 Maintenance amp Service 4 Maintenance amp Service It is recommended that preventative maintenance is performed annually this requires approximately fifteen minutes More frequent maintenance may be required when the monitor is operated in demanding environments Preventative maintenance comprises a calibration check see Procedure 16 and replacement of the particle filter see Procedure 9 Main PCB i S 130335599 EIN G
30. he SETUP menu see Figure 6 using the down arrow button to highlight the LOAD DEFAULTS option The button options at the base of the screen change to BACK LOAD Pressing the LOAD button will return the settings to the default factory values which are Alarm High limit 9596 Alarm High idle polarity LED ON Alarm Low limit 596 Alarm Low idle polarity LED ON LCD contrast 14 Once set the above values are stored in flash memory and will be used on start up Procedure 8 Returning the unit to factory default settings 8i Bii While in the VALUE mode shown in Figure 4 the default mode after switch on press the right hand navigator button the SETUP button This brings up the menu as shown in Figure 5 Issue 1 v05 14 May 14 Page 13 of 40 Operation Press the right hand navigator button to access the menu 8iv Use the right hand button labelled with an arrow to scroll through the menu Highlight the LOAD DEFAULTS option then press the central ENTER button 8v Use the central LOAD button to load the factory set defaults 3 1 11 Graph Display When in VALUE or SETUP modes pressing the GRAPH button the left hand navigation button will change the mode to the GRAPH mode See Figure 12 below inn 2 LOG 0 GRAPH 12 In GRAPH mode the screen is used to display graphical representation of the historical value of the ind
31. ibrate their equipment using gas mixtures supplied in cylinders which fundamentally provide constant volume percent mixtures The relationship between mole density and volume percent depends on the ambient pressure and temperature If a non pressure compensated infra red monitor is checked periodically against a cylinder of calibration gas the reading would appear to change with the error being related to the pressure and temperature The Guardian NG measures the pressure and temperature in the sensor head and compensates to eliminate these factors so there are no systematic errors arising from variations in pressure and temperature over the range 0 40 C and absolute pressure range 800 to 1150 mbar Issue 1 v05 14 May 14 Page 24 of 40 Calibration 5 4 Calibration Checking Procedure Before performing a calibration read the above section on the effects of pressure on calibration and ensure that the sensor head pressure and temperature are within the permitted limits Procedure 16 Checking the calibration 16 i Power the Guardian NG for at least one hour before checking the calibration 16i Apply zero gas i e gas containing of the gas measured by the instrument nitrogen recommended to the inlet port see section 5 2 above and allow the display to settle for at least one minute The Instruments reading should be within the range 0 0 5 of the unit s full scale under normal conditions If the zero display is outside thi
32. icated gas concentration The way the data is presented may be changed by using the GRAPH mode setup menu described below While in GRAPH mode pressing the GRAPH button the left hand navigation button again will open the GRAPH mode setup menu display as shown below in Figure 13 2 LOG Figure 13 Graph settings menu Using the down arrow key you can move through the three options X range Y range and style When X range is selected pressing the X range button displays the currently selected number of samples per pixel along with and button options By pressing the appropriate or button the time axis may be changed between e 1 sample per pixel Graph displays last 16 seconds of readings 4 samples per pixel Graph displays last 1minute of readings 8 samples per pixel Graph displays last 2 minutes of readings 80 samples per pixel Graph displays last 21 minutes of readings 480 samples per pixel Graph displays last 2 hours of readings When range is selected pressing the range button the currently selected Issue 1 v05 14 May 14 Page 14 of 40 Operation Maximum value displayed on the x axis is shown as a of the monitor full scale along with and button options The scale of the Y concentration axis may be increased or decreased by pressing the appropriate or button Available scales are e 0 100 of full scale 0 10 of full scale e 0 1 of full scale When
33. ight LCD SETTINGS then press the central ENTER button This brings up the LCD SETTINGS SCREEN shown in Figure 9 5v Use the central and right hand buttons labelled and to adjust the contrast CAUTION Setting the contrast too far from its original value can make the display impossible to read Use this functionality with care The factory default value is 14 3 1 8 Set Password screen The Guardian NG has an optional password facility to prevent unauthorized adjustments being made to the way the monitor is set up and calibrated The PASSWORD menu allows a password to be set or changed Issue 1 v05 14 May 14 Page 10 of 40 PHD ILCLLLRLL 1 BZW EHAELE Figure 10 Set password screen The password is made of three letters L C amp R They correspond to the positions of the three navigation buttons under the display left L the centre C and the right key R The password is 8 characters long and once set it will need to be entered before access to the protected menu items will be enabled again Once the password is enabled the keypad will lock after about 12 seconds of no activity in any of the top level menu screens GRAPH VALUE or SETUP To unlock a protected setting navigate to the item using the three buttons o and enter the 8 character password when requested Procedure 6 Setting the password 6i 6vii Whi
34. le CO 0 3000 ppm to 0 100 CH 0 5 to 0 100 Controls via display and menu alarm 1 view and adjust Accuracy 1 lt 296 of full scale alarm 2 view and adjust Response Time lt 30s from sample inlet zero adjust Operating Temperature Range 0 40 C span adjust Warm up Time options bit switch Operational 1 min Outputs Full Specification 30 mins 4 20 mA 0 20 mA analogue output 11V guaranteed drive capability Alarm 1 relay Alarm 2 relay amp Fault relay SPCO single pole change over voltage free contacts rating Power Poe 8A at 250 VAC resistive load 8A at 24 VDC resistive load Humidity Range Unaffected by 0 95 RH non condensing Power Consumption 13 W typical Enclosure rating IP54 Dimensions 260 x 280 x 140 mm Weight 2 5 kg Table 8 1 Specifications NOTES 1 Accuracy does not include calibration gas accuracy 2 This equipment is not suitable for use in with explosive atmospheres 3 Precautions must be taken where there is a risk of asphyxiation see section 7 1 4 This equipment is specified for use in air and air like backgrounds Issue 1 v05 14 May 14 Page 31 of 40 9 Glossary 9 Glossary Acronym Definition AC Alternating Current BS British Standard CH Methane Carbon Dioxide Carbon Monoxide COSHH Control of Substances Hazardous to Health DSP Digital Signal proce
35. le in the VALUE mode shown in Figure 4 the default mode after switch on press the right hand navigator button the SETUP button This brings up the menu as shown in Figure 5 Press the right hand navigator button to access the menu Use the right hand button labelled with an arrow to scroll through the menu Highlight SET PASSWORD then press the central ENTER button This brings up the password screen shown in Figure 10 Use the right hand button to highlight the password PWD Press the central MODIFY button to change the password The password is made up of 3 letters L C R standing for left centre and right and referring to the three navigation buttons To enable or disable the password highlight the top menu option which shows either ENABLED or DISABLED and press the central button DISABLE or ENABLE Once enabled the password will take effect after 12 seconds of inactivity in any of the top level menu screens GRAPH VALUE or SETUP Issue 1 v05 14 May 14 Page 11 of 40 Operation 3 1 9 Set Display Resolution screen For ranges up to 5000 ppm the concentration is displayed in parts per million ppm For ranges 196 and above the concentration is displayed as a percentage as shown in Table 3 1 Measurement Ranges 0 2000 ppm 0 3000 ppm 0 5000 ppm 0 1 96 0 3 0 10 0 30 0 100 Table 3 1 measurement ranges The displayed resolution may be adjusted to suit different
36. ndent energised Settling Settling seconds on gas on gas towards towards concentration concentration gas gas and alarm and alarm reading reading set points set points 204 Gas Dependent Off Dependent energised Equivalent Equivalent Reading on gas on gas to the gas to the gas concentration concentration reading reading and alarm and alarm set points set points Table 3 3 Guardian NG self test and warm up sequence Note the fault relay is energised in the non alarming state so that it goes into the alarming condition when power is removed from the equipment fail safe operation The fault relay can therefore be heard to operate and go into a non alarming state when power is first applied 3 4 Relay Outputs The alarm and fault relays may be connected to external control or annunciation equipment The relay outputs are suitable for direct connection to the standard single phase mains supply since the relays used have 5 kV coil contact isolation and the PCB track clearances exceed 6mm Issue 1 v05 14 May 14 Page 17 of 40 Operation Relays are generally designed either for power or low level signal switching applications The contact requirements for these two applications are different and are generally incompatible The Guardian NG however has been designed for use in either application The relay contacts are made from a gold plated silver based alloy which makes them suitable for either low l
37. oll through the menu Highlight SET ALARM HIGH then press the central ENTER button This brings up the set alarm high menu shown in Figure 7 2v To set the value at which the alarm is activated use the right hand navigator button to highlight the SET TO 96 option then press the central ENTER button Issue 1 v05 14 May 14 Page 8 of 40 Operation 2vi The central and right hand and buttons now enable the limit to be changed in 5 steps This display screen is shown in Figure 8 3 1 5 Set Idle Polarity Option The Set Alarm High IDLE POLARITY option sets the alarm conditions of the High Alarm relay and front panel High Alarm LED It enables the user to choose whether the Alarm LED and Relay are activated powered above the set point or activated below the set point If the IDLE POLARITY is set to LED OFF and the indicated concentration is less than the set point the High Alarm LED will be off and the relay will be unpowered P is connected to T1 If it is set to LED ON the High Alarm LED will be on when the indicated concentration is less than the set point and terminal T2 will be connected to the common terminal P The non alarm state of the LED and Relay is indicated by the bar connecting either T1 or T2 to P as shown in Figure 8 Procedure 3 Setting the Idle Polarity 3i While in the VALUE mode shown in Figure 4 the default mode after switch on press the right hand navigator button the SETUP button 3ii
38. on 5 12 13 sampling 1 4 6 SETUP mode 5 7 terminal cover 16 VALUE 5 11 13 14 Page 33 of 40 11 Accessories and Spare Parts 11 Accessories and Spare Parts Part Number Description 99000 Particle Filter With Integral Seal Issue 1 v05 14 May 14 Page 34 of 40 12 12 Warranty Edinburgh Instruments Ltd is 509001 2000 registered company your Guardian NG has been manufactured in accordance with our quality system The product should only be operated in accordance with this manual and other documentation supplied by the manufacturer Edinburgh Instruments Ltd guarantees the equipment against defective materials or workmanship for a period of one year from the date of delivery Exceptional operating conditions damage due to careless handling modifications made by the owner or misapplication will void the guarantee In no event shall Edinburgh Instruments Ltd be liable for any consequential loss or damage arising from the failure of the equipment under warranty At the end of the warranty period all liability for failure of the equipment shall be absolutely at an end In the event of a fault occurring with the Guardian NG the equipment should be returned to the authorised dealer from whom it was originally purchased For equipment
39. oratory Opinions and interpretations expressed herein are outside the scope of UKAS Accreditation EUT Submitted These results apply only to the particular EUT submitted in the configuration used and in the mode of operation tested Certificate No 3127TC1 17219 2 17310 1 amp 17297 Date 25 March 2011 Page 1 of 2 PDF copy C Hamilton Test Technician G The Copyright in this certificate i vested in EMC Services 2097 Lid The Certificate may be re in erttirety bet reproduction of erry extract expresny forbidden EMC FORM 044 Inxue 12 Notified Body THe Universstvarferk No 1292 uet INVESTOR IX von x Consi y m Issue 1 v05 14 May 14 Page 40 of 40
40. re to avoid electric shock 6 1 Errors amp fault indications from the firmware The Guardian continually monitors various parameters and in the event of a malfunction it will operate the fault relay the warning buzzer and the fault light on the front panel All navigation switches are disabled and the display will show an error code which is explained in the table below Error Description How to fix it 1 Lamp Fault Change Lamp Check Lamp voltage 2 Negative Reading Fault Indicated Concentration less than 596 Check the detector Recalibrate 3 Over range Fault Indicated Concentration more than 130 of FSD Check the detector and gas Recalibrate 4 DSP temperature gt 70C Make sure the ambient temperature is within specifications Use cooling if necessary 5 DSP temperature lt 0C Make sure the ambient temperature is within specification limits 6 Head temperature gt 70C Make sure the ambient temperature and the gas temperature are within specifications Use cooling if necessary 7 Head temperature lt sure the ambient temperature and the gas temperature are within specifications 8 Reference signal under 5096 of nominal Damaged Optics Check signal and gains Issue 1 v05 14 May 14 Page 27 of 40 9 Channel signal under 10 Damaged Optics nominal Check signal and gains 10 Sample channel too
41. rocedure Ensure all connections are correct and secure before re powering the instrument The Guardian NG has been designed to the highest safety standards and the danger of coming into contact with the live conductors in normal use is minimal However we do not recommend that the power supply unit be operated outside its case as this forms part of the protection against electric shock Issue 1 v05 14 May 14 Page 21 of 40 Maintenance amp Service 4 4 Fuse Replacement Procedure 12 Replacing the fuse There are two fuses in the Guardian NG one is located on the main PCB see Figure 16 and one on the Power supply PCB When replacing the mains fuse use only 20 mm anti surge fuses indicated by the character T before or after the fuse rating Other faster fuses may blow during switch on Fuse details Reference Function Rating Power Terminal Board see Figure 16 200 1 Main PCB 1 5A reset Table 4 1 Fuse details 4 5 Pump Replacement The pump is located on the Mounting Plate Figure 16 and may be replaced as follows Procedure 13 Replacing the pump 13i Disconnect the pump from the relay PCB by unplugging the connector from the relay PCB 13ii Detach the pump by removing the two screws at opposing corners of the pump bracket which hold the pump to the PCB The screws fit into inserts which are permanently attached to the mounting plate 138 Withdraw pump
42. s range you should adjust the zero calibration see section 5 5 16 ii Apply a certified Test Gas mixture containing a known near span concentration We recommend using gas with between 8096 and 10096 of the instrument full scale 16iv Allow the display to settle for at least one minute If the instrument s reading is different from the Test Gas concentration by more than 296 of its full scale certified tolerance of Test Gas the unit should be recalibrated at zero and span see section 5 5 below 16v Remove the Test Gas to complete the procedure and return to normal operation 5 5 Calibration Procedure see also 3 1 1 Before performing a calibration read the above section on the effects of pressure on calibration and ensure that the sensor head pressure and temperature are within the permitted limits The Zero and Span adjustment buttons are located on the front panel and may be accessed using the display menu system The value of the zero and span adjustment variables are stored in the microprocessor flash memory The values of the zero and span adjustment variables are set to mid position during factory calibration to allow maximum field adjustment lt also enables any field adjustment and its extent to be checked on return to the factory Issue 1 v05 14 May 14 Page 25 of 40 Calibration Procedure 17 Calibrating the Guardian NG 17 i 17 ii 17 iii 17 iv 17 v Power the Guardian NG for at least one ho
43. ssor EMC Electromagnetic Compatibility EN European Standard FSD Full Scale Deflection IEC International Electrotechnical Commission LCD Liquid Crystal Display LED Light Emitting Diode NDIR Non dispersive Infrared PCB Printed Circuit Board ppm Parts per million PSU Power Supply Unit PVC Polyvinyl Chloride RH Relative Humidity RMA Returned Materials Authorisation VAC Volts Alternating Current VDC Volts Direct Current Issue 1 v05 14 May 14 Page 32 of 40 10 Index memory 4 7 10 analogue output 1 3 5 16 31 calibration 5 6 19 23 26 31 4 electrical installation 2 gas concentration 6 10 12 14 17 24 GRAPH 1 1 14 IDLE 8 9 LCD 7 10 1 19 23 mole 5 24 Issue 1 05 14 May 14 10 Index molecules eene 24 navigation buttons 5 7 11 particle 1 19 20 password 5 7 11 PCBs 16 18 20 22 32 PUM 21 23 28 BIaVS casco tandiu da AG RR 3 5 17 18 resoluti
44. uld be assessed so that a compatible tubing material can be chosen For most applications Neoprene PVC or nylon are suitable tubing materials Natural rubber is not recommended due to its tendency to perish Silicone rubber tubing is not suitable It readily absorbs and releases gas as a result it exhibits a memory effect which leads to false readings There is a small memory effect with all plastic tubing this is not normally a problem However for demanding applications involving longer lengths of external tubing copper or other metal tubing should be considered If condensation is likely to occur in the sample line an external water trap should be fitted and regularly emptied Condensation will be a problem in situations where the sample line is cooled below the temperature of the sampling point This may occur if the tubing is cooled by draughts is external to the building where the sample is taken or passes through a cold area within a building Gas vented from the monitor can be released into its surroundings unless safety considerations require that the gas be vented elsewhere This can be achieved by attaching 5 mm bore tubing to the outlet nozzle The venting gas system should ensure minimal back pressure Any increase in the pressure within the sensor head may lead to a reading error or flow alarm if the internal pressure exceeds 71150 mbar absolute Issue 1 v05 14 May 14 Page 4 of 40 Section 3 Operation 3 Op
45. ur before checking the calibration Apply zero gas i e gas containing none of the gas measured by the instrument nitrogen recommended to the inlet port see section above and allow the display to settle for at least one minute If the instrument s zero reading is out of specification it may be adjusted by enabling the zero and adjustment buttons press the VALUE button when in value mode see section 3 1 1 Once the buttons are enabled they may be used to set the displayed value to zero Apply a certified Test Gas mixture containing a known near span concentration We recommend using gas with between 8096 and 10096 of the instrument full scale Allow the display to settle for at least one minute If the instrument s reading is out of specification it may be adjusted by enabling the span and adjustment buttons press the VALUE button when in value mode see section 3 1 1 Once the buttons are enabled they may be used to set the displayed value to be the same as the certified value of the Test Gas being used Remove the Test Gas supply and exit the calibration mode by pressing the BACK button to end the calibration procedure and return the unit to normal operation Issue 1 v05 14 May 14 Page 26 of 40 6 Trouble Shooting Section 6 Trouble Shooting Servicing should only be performed by a qualified electronics engineer WARNING This apparatus operates from the mains electrical supply between 90 VAC and 260 VAC Take ca
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