Extox-Uni xTM controller user manual
Contents
1. adjusting trimmer potentiometer amplification adjusting trimmer potentiom ter zero adjuster trimmer potentiometer reset button of overdrive comparator placed under decoration front panels only in case of application of certain sensors amp amp KF KK 6 2 CONNECTION POINTS 230V AC power supply point 230V AC power supply point OH H self error or sound signal relay contct OH H self error or sound signal relay contact R alarm relay contact R alarm relay contact E presignal relay contact E presignal relay contact AK positive terminal of supply of 24 V for UPS AK negative terminal of supply of 24V for UPS RK recorder output positive terminal RK recorder output negative terminal TR connection point of outer cancellation button TR connection point of outer cancellation button A transmitter connection point A transmitter connection point F X transmitter connection point K Y transmitter connection point 1tkonyvAng doc 12 6 3 OPERATION HANDLING INTERPRETATION OF STATUS SIGNALS The operation of EXTOX UNI gas concentration measuring apparatus can be traced by means of the signals of central units The status of operation is displayed by the light of green LED as operation The devices are not capable for operation at the very instant of switching on because of the caracteristics of sensors Therefore the devices start operation after timing of I minute approximately During ti2. of transmitters onto earth connected iron framing is allowed The class of protection of against indirect contact of modular device type EXTOX UNI xTM is I Earth conductor must be connected to the apparatus The devices types EXTOX UNI IT and IT S are of plastic armoured ones with reinforced insulation and they are in protection class II These devices shall not be connected to earth conductor wire If the user supplies separate break switch protected cable for the power supply of gas detection devices the break switch or mains switch if any should be 1tkonyvAng doc 14 located close to the gas detection apparatus and it should be indicated which device is operated by them Remark since the gas detection instruments are safety devices of continuous operation and switching them off is possible only in justified situation i e when servicing them it is practical to indicate the inscription of Switching off prohibited close to the main switch or break switch 7 3 MEANINGS OF ABBREVIATIONS AND SIGNALS LEL Volume ppm CANCEL ALARM SELF FAILURE PREALARM OPERATION HEATING E R LEVEL AMPLIFICATION CONNECTING TO NEUTRAL B1 B2 B3 e Oo ItkonyvAng doc Lower Explosion Limit in percentage Volume Percentage parts per million parts per million of given volume Cancellation of alarm and acoustic signal Signal of state of alarm Display of state of self failure Signal of state of prealarm State o
3. of cables Dimensions Allowed outside temperature Protection MSZ IEC529 1tkonyvAng doc MWG100NE depending on measured materials and sensor depending on measured materials and sensor 14 28V Direct Voltage 4 20mA depending on concentration No 0 5 1 5mm 9 1 mm width 102mm height 170mm depth 58mm weight kb 850g 0 40 C IP32 16 EXTOX UNI CENTRAL UNIT MODULES Supply Protection MSZ IEC 529 Outside temperature Outputs Recorder output Loadability of voltage free relay contacs Display of measured value 230 V 10 50 Hz max 14 VA Mains and or 22V 28V direct voltage max 400 mA Attention Supply of 24V can be insulated from mains of 230V by reinforced insulation only IP 00 only the modul ill IP 20 mounted in rack box 0 40 C 4 20mA output current Ry 1MQ Rmax 800 Q or 0 4V 2V output voltage Ry lt 1 5 Q Rimin 300 Q Attention Recorder output can be connected only to insulated receiving circuits which are separated from other circuits by reinforced insulation max 50V 2A 3 digit LED EXTOX UNI IT IT S CENTRAL UNITS Supply Protection MSZ IEC 529 Outside temperature Outputs Recorder output Loadability of voltage free relay contacts Display of measured value 1tkonyvAng doc 230 V 10 50 Hz max 14 VA Mains and or 22V 28V direct voltage max 400mA Attention Supply of 24V can be insulated from mains of 230V
4. EXTOX UNI xTM EXTOX UNI IT IT S STATIONARY GAS CONCENTRATION MEASURING DEVICES MANUAL ATEX version LAN BM www gazerzekelo hu Manufacturer MUSZER AUTOMATIKA KFT H 2030 rd Als u 10 Pf 56 Hungary Telephone 36 23 365 087 365 152 365 280 366 748 366 838 Telefax 36 23 365 837 E mail gaz muszerautomatika hu Service H 2040 Buda rs Baross u 77 Telephone fax 36 23 416 761 1tkonyvAng doc CONTENTS 10 11 PURPOSE OF DEVICES CONSTRUCTION TYPES AND APPLICATIONS 3 1 Central units 3 2 Transmitters DESCRIPTION OF OPERATION 4 1 Operation of central units 4 2 Operation of transmitters according to applied sensors 4 3 Operation of cable junction boxes connected to central units INSTALLATION AND PUTTING INTO OPERATION OF DEVICE 5 1 Conditions of installations 5 2 Placement of transmitter and central unit 5 3 Cabling of transmitter and central unit 5 4 Conditions of installation installation HANDLING AND OPERATIONAL INSTRUCTIONS 6 1 Handling units status signals 6 2 Connection points 6 3 Operation handling interpretation of status signals 6 4 Cleaning CONDITIONS OF SAFE OPERATION 7 1 Operation in explosion dangerous environment 7 2 Aspects of protection against indirect contacts 7 3 Meanings of abbreviations and signals TECHNICAL DATA GUARANTEE SERVICE MAINTENANCE APPENDIX Manuals of transmitters E TD P1 and E TD S1 manufacturer s state
5. c should be installed on the designed cable traces When determining the cable lengths we have to reckon with connectability allowances The connecting of cables is not the job of the cable mounting experts but this process is part of installation 1tkonyvAng doc 10 5 4 CONDITIONS OF INSTALLATION INSTALLATION The preconditions of putting into operation are the existence of properly installed gas sensitive apparatus alongwith cabling and power supply The installation of the apparatus can be performed by an authorized expert who attended courses of operators technical head of repairment service of damp proof and explosion proof electrical eguipments and having proficiency of proper installation of EXTOX UNI type gas detectors During installation the cables of apparatus should be connected The actuating electrical circuits which are connected to relay contacts should be checked according to loadability the power supply according to its parameters and the complete apparatus in respect of explosion proof requirements After getting favourable results the device can be energized and afterwards total operational inspection should be performed by the help of calibration material An installation protocol is made on successful installation duly signed by the insallation person and the customer or his her representative accepting the works The total operation inspection includes the inspection of the apparatus only the check of operation o
6. ck system devices can be made through the connection panel on the back of the rack by means of serial terminals The connection panel is also suitable for commoning of independent output contacts of the channels separately by functions according to the requirements of application 4 2 OPERATION OF TRANSMITTERS ACCORDING TO APPLIED SENSORS The EXTOX UNI gas sensitive devices are working basically on four measurement principles Depending on type of materials and measuring range they are available with the following sensors semicoductor catalytic infrared and electrochemical In the case of semiconductor based sensors the sensitive element is directly connected to the central unit without processing electronics The measuring transducer makes use of the characteristics of special purpose semiconductor i e the elactrically heated semiconductor layer can change its conductivity i e resistance considerably The performance of sensors is typically nonlinear as a function of concentration In the case of use of catalytic sensors a platinum filament is heated by electric current in the measuring transducer The platinum filament is surrounded by catalyzer material The catalyzer is capable of oxidizing the flammale materials even below normal combustion temperature in presence of oxygen of air This oxidation goes with temperature increase depending on the concentration of inflammable material which increases the resistance of heate
7. concentration measuring instruments can be manufactured in large number of varieties The trasmitters and central units of the device can be selected according to the specified application The type of transmitters are determined by the concentration of chemicals the measuring range and the danger rate existing in the area The type of central unit is determined by the necessary quantity of transmitters and type of application The name of complete device mounted with transmitters is the same as that of the central unit not depending on the type of transmitter to be used 1tkonyvAng doc 3 3 1 CENTRAL UNITS The types of central units can be as follows EXTOX UNI xTM General purpose instrument in rack system in complete design it is built of modules that are actuating 4 6 9 or 12 pcs of transmitters In the name of it the figure standing in place of x means the number of modules i e number of operating modules the letters of TM refer to stationary modular design For example EXTOX UNI 9 TM If the rack should not be filled completely the number of built in modules are also specified at the end of the denomination For example EXTOX UNI 6TM S If more than 12pcs of transmitters are to be operated we have to apply more racks EXTOX UNI 1T General purpose instrument for operating only one single transmitter In denomination IT refers to single channel stationary construction EXTOX UNI IT S The device is specifically desi
8. d platinum filament This can be detected as an electric signal in a bridge circuit In this case the sensor also coupled directly to the central unit In the case of application of infrared sensors the measurement of concentration is based on the light absorption properties of the material to be measured in infrared spectrum The change of absorption as a function of concentration is detected and transformed into electric signal by the sensor This electric signal is converted into output current of range of 4 20 mA by the tranmitter s electronic circuits which are interconnected to the sensor This output current is in direct proportion to the concentration 1tkonyvAng doc 7 4 3 5 1 In the case of application of electrochemical sensors the detecting elements generate electric current by means of chemical reactions as a function of measured material concentration The signal processing electronics amplify the output current of the sensor and convert it into the range of 4 20 mA current consumption The properties of electrochemical transmitter conform to the properties of applied electrochemical sensors OPERATION OF CABLE JUNCTION BOXES CONNECTED TO CENTRAL UNITS The cable juction box is an additional connection surface of the devices that can operate at most 12 transmitters and applied on request where the cables of central unit transmitters the actuating instruments controlled by gas sensors and the power supply units may be co
9. es are suitable for operation and the easy handling and rational cabling can be ensured The central unit should be protected against the effect of heat radiation and can be operated in allowed temperature range If cable junction box is applied to the apparatus it should be placed close to the central unit considering space and trace requirements of applied cables The EXTOX UNI multichannel stationary modular gas sensitive devices up to 12 pcs of moduls should be mounted by the help of support the single channel EXTOX UNI IT and IT S should be mounted on even surface vertical wall The reset pushbutton should be mounted near the apparatus The devices with more than 12 modules assembled in big boxes shall be mounted on the wall or on flat horizontal surface depending on dimensions of the instrument box The devices should be placed in such a way that the free air circulation be ensured in the ambient space of air outlets if they are available Furthermore in the case of modular devices the IP protection allows the installation in dry places only 1tkonyvAng doc 9 5 3 When placing the transmitters sensors the form of free air space the location of hazard points the occasional air flows and the density of occuring gases are to be taken account For gases lighter than air H CH CO NH the sensors shall be placed in the upper part of air space for heavier gases they must be put into lower locations The solvent vapours are hea
10. ether the alarm is originated either from failure or concentration In case of self error signal the apparatus cannot be considered as suitable for operation The trimmer potentiometers located behind the front panel are designed for adjustment of the apparatus If the concentration significantly exceeds the measurement range of the apparatus at several detector types the overdrive comparator will be activated In this case the display will signal owerflow and the alarm cannot be cancelled The cause of this state must be checked up and eliminated imperatively The overdrive comparator can be set back to normal operation by cancellation button afterwards In the case of types of EXTOX UNI xTM the cancellation of alarm and acoustic signals is possible by means of the cancellation buttons located on the apparatus and by the additional outer cancellation button Nevertheless the outer cancellation button cancels the alarm or acoustic signals not only on the actual module but on all the modules simultaneously In the case of types of EXTOX UNI IT and IT S the cancellation of alarm and acoustic signal is possible only by means of the outer cancellation button 1tkonyvAng doc 13 6 4 7 1 7 2 CLEANING The cleaning of devices is only needed if dirt impedes operation The removal of such dirts usually reguires disassembling of the apparatus which is the job of the service In other cases cleaning is allowed but this cannot endanger the
11. f actuating circuits of relay contacts is not included This way for example if the actuating circuits are not built up by the time of installation the gas sensitive devices can be installed anyway It is worth carrying out the installation in such a predetermined period so that the complete system can be tested alongwith emergency ventilation gas magnetic valve acoustic and light signals in order to avoid later possible malfunctions The installation can be performed upon order The planned date and circumstancies of installation should be checked with our service 3 4 days in advance at the following address Address 2040 Buda rs Baross u 77 Telephone fax 36 23 416 761 If the conditions of installation are not ensured or the technical circumstancies are not suitable in the predetermined period and promt solution is not possible the installation fails by mistake of customer This fact is to be written in the duly signed protocol as well In this case the failed installation is at the cost of the customer 1tkonyvAng doc 11 6 HANDLING AND OPERATIONAL INSTRUCTIONS 6 1 HANDLING UNITS STATUS SIGNALS on central unit the following handling units are available three digit seven segment LED except type IT S reset button except types of IT and IT S alarm LED red self error yellow or sound LED red pre signal LED red operation LED green heating current adjusting trimmer potentiometer comparation levels
12. f being switched on Potentiometer setting the heating current of detecting heads Potentiometer setting levels of prealarm and alarm Potentiometer setting the sensitivity of device Potentiometer setting the neutral point of device Mains fuses Fuses of optional 24V supply Device protected by double or reinforced insulation Caution Reference to the documentation Protection connector 15 8 TECHNICAL DATA EXTOX UNI E TD S1I SEMICONDUCTOR TRANSMITTER Detailed technical data and prescriptions of application in its separate manual EXTOX UNI E TD P1 CATALYTIC TRANSMITTER Detailed technical data and prescriptions of application are in its separate manual EXTOX UNI INFRARED TRANSMITTER Type Measured material Response time too Precision of repetition Supply Output signal Sensitive element Explosion proof protection Protection MSZ IEC 529 Outside temperature Diameter of cables Cable core cross section Allowed loop resistance Dimensions with stand Weight with stand EXTOX UNI IRTA 1 and IRTA 2 carbon dioxide 22s 10 2 19 28V DC max 180mA 4 20mA linear current consumption two beam infrared no IP 54 20 40 C 7 9mm 0 5 1 5mm 102 max 135 x 126 x 95 mm approx 0 55 kg MWGI100NE ELEKTROCHEMICAL TRANSMITTER Type Response time Precision Supply Current drain Explosion proof protection Cable core cross section Diameter
13. gned for gas boiler houses and suitable for operation of one transmitter In denomination IT S refers to one channel stationary construction and used for gas boiler houses 1tkonyvAng doc 4 3 2 TRANSMITTERS EXTOX UNI E TD S1 It is designed for measurement of concentration of numerous inflammable and explosive materials and operates with semiconductor transducers stationary diffusion type explosion proof transmitter EXTOX UNI E TD P1 It is designed for measurement of concentration of several inflammable and explosive materials and operates with catalytic measuring transducers stationary diffusion type explosion proof transmitter EXTOX UNI IRTA 1 s IRTA 2 It is designed for measurement of concentration of carbon dioxide with infrared measuring transducer stationary diffusion type not explosion proof transmitters MWG 100NE It is designed for measurement of concentration of several toxic materials and oxygen and operates with electrochemical measuring transducers stationary diffusion type not explosion proof transmitter 1tkonyvAng doc 5 4 1 DESCRIPTION OF OPERATION OPERATION OF CENTRAL UNITS The task of central unit type EXTOX UNI is to operate the connected transmitters processing the incoming electric signals which are coming from transmitters dependending on gas concentration information transfer output of alarm signals control of actuation Their design is as follows each transmitter is handled b
14. installation site should be selected in such a way that the possibility of usual maintenance works and the proper and safe operation can be ensured Since the two parts of the apparatus the central unit and the transmitter have completely different electrical characteristics we have to take different rules into account The central units and the cable junction boxes are of non explosion proof ones therefore using them in explosion dangerous rooms or sectors is forbidden The transmitters may be installed according to the prescriptions of manuals only In the event the installation is prescribed by authorities the installation should be based on a project plan The prescriptions of that should be met and the content of project plan should not contradict the installation rules hereby mentioned If no detailed project plan of installation is available or the procedure of it is uncertain please contact the company service or the experts of manufacturer to clarify the questions PLACEMENT OF TRANSMITTER AND CENTRAL UNIT The placement of transmitter and central unit is determined by project plan In lack of it its placement can be decided only with care The placement of transmitters can be determined according to the informations indicated in the manuals In the case of the central units we have to choose such places outside the sector limits but within the range of maximum possible installation distance where the environmental circumstanci
15. ment attached drawing 1tkonyvAng doc L PURPOSE OF DEVICES The devices types EXTOX UNI EXTOX UNI IT and EXTOX UNI IT S are stationary type gas concentration measuring devices of trasmitter systems for industrial use Their denomination refer to universal measurement devices of explosive and toxic chemicals Their purpose is the measurement of concentration of inflammable toxic and other dangerous gases and vapours Their task is to signal in advance in emergency situations with respect of life property and evironmental protection by automatic control of actuation In case of explosive materials at the concentration of lower explosive limit in the case of toxic materials before reaching the health safety limit they give signal The signals are suitable for the appropiate control in the form of potential free contacts to avoid possible accidents 2 CONSTRUCTION The EXTOX UNI gas concentration measuring devices are built of transmitters and central units The transmitters and central units can be connected together by transmitter cables The transmitters include measuring transducers which transform gas concentration into electric signals while the central units operate the transmitters and elaborate the elecric signals of them which depend on gas concentration If necessary the cable junction boxes which meet the requirements of process control may be attached to the central units 3 TYPES AND APPLICATIONS The EXTOX UNI gas
16. ming the relay contacts of alarm and self error are in state of danger signal After timing period if the measured concentration makes it possible they change over in dangerfree state automatically The actual gas concentration can be read continuously on 3 digit 7 segment display The light of red coloured prealarm LED displays the state of prealarm The function of other red coloured LED of alarm is to read the state of alarm which can be cancelled by the cancellation button after stopping of the state causing the alarm If the third one among the actuation controlling relay contacts is made for acoustic function the light of red coloured LED of acoustic displays the active state of acoustic relay This active status always activated alongwith the state of alarm but it can be cancelled by the cancellation button before ceasing of state which induced the alarm in order to switch off the audible warning device operated from the apparatus After ceasing of the state which induced the alarm by pushing the cancellation button repeatedly the alarm state can be cancelled In case the third actuation controlling contact of the apparatus is designed for self error function the yellow LED of self error calls the attention on failure of the device The failure of device also induces alarm signal not depending on the function of third actuation controlling contact By means of self error signal in the event of alarm it can be decided wh
17. nnected In case of built in instruments of higher transmitters quantities the cable junction boxes are replaced by a suitably built bigger cabinet The relay contacts of central units are not suitable directly for switching of electric circuits of network voltage level Therefore into the cable junction boxes extra low voltage power supply and repeating relays can be placed as well In this case the repeating relays are controlled by the relay contacs of central unit The number and loadability of built in relays meet the requirements of actuating instruments i e ventilators gas magnetic valves illuminators e t c as well The cable junction box is also used to uninterrupt the gas sensitive device i e to receive the suitably developed UPS of 24 Volts with batteries In the case of single channel devices EXTOX UNI IT IT S the armoured cable of transmitter can be connected directly to the central unit as well therefore if the quantities and loadability of relay contacts are sufficient there is no need for cable junction box In any case for modular devices EXTOX UNI xTM a suitably designed junction box is absolutely necessary INSTALLATION AND PUTTING INTO OPERATION OF DEVICE CONDITIONS OF INSTALLATION OF DEVICE 1tkonyvAng doc 8 I2 The EXTOX UNI gas concentration measuring devices can be installed only in such places the requirements of which are satisfied by the technical parameters of the instruments Furthermore the
18. perational conditions will change to interruption but the acknowledgement button is not effective on it It is important that because of the characteristics of the sensor heads the instruments always start with state of alarm after switching on and later after a timing period they get into normal state of operation if it is allowed by gas concentration The signal levels of central units can be adjusted in increasing or decreasing concentration values as well depending on properties of measured materials or requirements of application The comparation levels can be set in different values accordig to the customer s request taking the relevant standards into consideration The status of intervention control can be concluded from the light of LED s which are on the front panel of the device The actual concentration may be traced permanently on 2 5 or 3 digit display with the exception of instrument type IT S The displays show the values according to the measurement ranges as follows in LEL in volume i in ppm 1tkonyvAng doc 6 The appliances also may include recorder output allowing oftracing or processing the gas concentration in the range of 4 20 mA or 0 2 2 V in analog format The device is operated by 230V 50Hz power supply and or 24 V direct current The central unit can operate from UPS of 24 V enabling continuous performance of the instrument in the event of power cut The connection to the connecting points of modular ra
19. safe operation Water or other chemicals are not allowed to get into the apparatus Use of solvents that can damage the cover are not allowed either CONDITIONS OF SAFE OPERATION OPERATION IN EXPLOSION DANGEROUS ENVIRONMENT It is prohibited to connect the central unit of EXTOX UNI to such electrical appliances that are not necessary for proper use or the electrical parameters of which exceed the limits indicated in the technical data of the apparatus In the gas sensitive apparatus any modification is prohibited without permition of the manufacturer In explosive environment only approved explosion proof transmitters are allowed to use The detailed conditions of safe application of explosion proof transmitters can be seen in their separate manuals ASPECTS OF PROTECTION AGAINST INDIRECT CONTACT The central units are electrical devices operated by mains supply voltage of 230 V Opening of their casing under voltage by unauthorized persons is forbidden and dangerous to life The cabling of central unit and cable junction box if any to be made ina way that the reinforced insulations are not to be damaged among the electric circuits of different voltage levels The connection of devices are to be made according to the allotment of connecting points or description of handbook of connections The constructional design of the central unit is such that the transmitters are not to be connected to the earthing wire but for example the mounting
20. tion if the instruments are properly used The guarantee refers to failures originated from manufacture The conditions of guarantee subject to full observance of prescriptions of installation commissioning and safe operation Other condition of guarantee is a comletely filled installation protocol duly signed and dated by Service of M szer Automatika Ltd or its contracual partner and furthermore the instruments are actually serviced by M szer Automatika Ltd or its contractual partner SERVICE MAINTENANCE The EXTOX UNI gas concentration devices need regular servicing so that they can operate perfectly in long term If the devices work with explosion proof transmitters maintance works cover not only the checking up of the usual operation alongwith necessary adjustments of settings and error corrections but the checking of technical solutions ensuring explosion proof protection The service staff of M szer Automatika Ltd performs maintenace works on ad hoc assignment or on the basis of permanent maintenance contract By maintenace contract the professional regular maintenance can be ensured for a predetermined period In case of failure for fast error correction the following data should be specified type of instrument place of installation date of failure type of failure circumstancies of failure occurence a 1tkonyvAng doc 19
21. vier than air CABLING OF TRANSMITTER AND CENTRAL UNIT Each transmitter of gas concentration measuring devices types EXTOX UNI xTM IT and IT S should be connected by separate cable to the appropriate central unit of relevant manufacturing number All the cables but in particular the cables connecting the central unit and the transmitters shall be definitely identifiable Into the transmitters we can couple only such cables the diameter and core cross section of which meet the requirements of them in the case of explosion proof transmitters they are suitable for installation within the zone boundary The loop resistance of transmitter cable shall not exceed the highest allowed value The transmitter cable should be affixed within distance of 40 cm from the transmitter We have to strive for minimization of the the line section within the sector limits when designing the trace of transmitter cables without having definite project plan Lapping in transmitter cables should be avoided if possible Nevertheless if this is unavoidable in explosion dangerous space it is allowed only in certified explosion proof connection box For cabling we can use the offered cables or technically suitable replacement types If there are electric circuits of different voltage levels towards the actuating units the wires of them shall not be placed in the same cable bundle When cabling the nacessary cables of transmitter actuating supplying accoustic signal et
22. with reinforced insulation only IP 65 0 40 C 4 20mA es output current Ry l MQ Rmax 800 Q or 0 4V 2V output voltage Ru lt l 5 Q Rimin 300 Q Attention Recorder output can be connected only to insulated receiving circuits which are separated from other circuits by reinforced insulation max 50V 2A 3 digit LED display except EXTOX UNI IT S 17 BASIC CABLE JUNCTION BOX Power supply Individual power consumption Protection MSZ EN 60529 Voltagefree relay contacts and loadability Um Inner relay operationg voltage 230V 4 1090 50Hz 20VA added to power consumption of central unit IP54 sound I pce of closing 250V 5A 50Hz prealarm 2 pcs of closing 250V 5A 50Hz alarm 2 pcs of droping 250V 5A 50Hz 24V AC At different designs the data are subject to change MEASUREMENT TECHNIQUE DATA OF THE INSTRUMENTS TRANSMITTER AND CENTRAL UNIT TOGETHER Response time tso too Precision 1tkonyvAng doc Depending on applied transmitters and measured material see technical data of transmitters in case of E TD S1 E TD P1 according to MSZ EN 50054 2000 and MSZ EN 50057 2000 Depending on applied transmitters and measured material see technical data of transmitters in case of E TD S1 E TD P1 according to prescriptions of MSZ EN 50054 2000 and MSZ EN 50057 2000 18 10 GUARANTEE M szer Automatika Ltd undertake guarantee for 1 year after date of installa
23. y independent electronics beginning from mains supply until potential free intervention of the controlling contacts In the case of one channel design IT s IT S each central unit has separate casing In spite the channels of modular multichannel gas sensitive devices work independantly they are placed in one casing In this case upon request of the user it is possible to use the conrolling contacts separately or jointly The performance of EXTOX UNI central units conform to the type and technical features of transmitters and measuring range Its universal structure makes it possible to measure different electrical guantities with the help of same or similar method of intervention control They have two signalling levels with relevant potential free relay output contacts each and an additional potential free relay output contact The latter is of optional use It is suitable for either muteable sound signalling which appears parallel with the state of alarm or self error Using self error signal we can decide whether in state of alarm the alarm signals were generated either by gas concentration or failure At prealarm level the relevant relay shows closed contact At alarm level the alarm relay interrupts the closed contact In case of muteable sound signal in state of sound signal the third relay outputs short circuit in case of acknowledgement it produces interruption In case of self error signal the closed contact which is valid at normal o
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