User Manual - Olympia
Contents
1. 4mA calibration can be carried out as explained on page 6 This calibration is necessary to adjust the sensor to the environment conditions Faults In case of failure the S output falls down to OmA FAULT The signal is then indicated as a damage situation The same happens also when an interruption to the connection wires between the sensor and the detec tor occurs Average life The sensitive element used in this type of sensor has an excellent stability in time In fresh air and in normal working condition the sensor s life should be about 18 month from the date of the installation Periodical testing we advise to carry out working tests every six months After 1 year we advise to proceed to the circuit recalibration with Gas Air mixture as explained on page 4 INSTALLATION The TS293EA is designed for standard two wire operation where the output is supplied via the same wire pair as the power supply The max load resistance RLMax will be the sum of the central system input impedances RL and the connection wire total resistance going and return see Fig 1 IST 2293 EA01 01 Istruzione User s Manual Manuel d utilisation Pag 4 6 To calculate the RLmax refer both to the diagram of Fig 3 and to the following py max Power Supply Vonage 10 x 1000 formula 24 10 x 1000 20 As an example the RLMax of a 24 Vdc Power Supply will be what follows RLmax 700 Ohm To this purpose it is recommended to use a sh2. every 6 12 months The gas to use should be a mixture of 200 to 300 ppm Ammonia and the rest of Nitrogen Warnings The calibration routine is to be carried out only in clean air and after about 8 hour instrument continual working Any calibration routines are to be carried out by trained or authorised personnel only For the trimmer ad justment a suitable sized screwdriver should be used Zero Calibration Open the housing cover and then connect a digital multimeter 20mA scale in series to the Power Supply Important by disconnecting the loop the Alarm and Fault relays of the central system the trans mitter is connected to will activate Wait for about five minutes to allow the transmitter to get a steady condition When in fresh air the value to read should be 4mA 0 5 f the readout is not 4mA only if necessary adjust the P1 ZERO trimmer to get 4mA Warning Be sure that there are not toxic gases in the environment In case of doubt you should execute either the 4mA verification using an air 20 9 O gas bottle or a synthetic air gas bottle with the Calibration Tester Con nect the Calibration Tester to the gas bottle see Fig 4 and insert it on the sensor Open the gas bottle reducer cock so as the flow meter is between the two stamps about 0 2 0 3 l m Wait for about 5 minutes and then check the value on the multimeter is 4 mA 0 2 mA Full scale calibration Connect the Calibration Tester to the NH ga
3. Istruzione User s Manual Manuel d utilisation Pag 1 6 B S 3 93 Trasmettitore 4 20mA per Ammoniaca TS 293 FA 4 20mA transmitter for Ammonia Trasmetteur 4 20mA pour Ammoniac Caratterizzati dal modo di protezione Have the following protection rate Sont caract ris s par le mode de protection suivant II 2G EEx d IIC T6 Numero di Certificazione Certificate number Num ro du certificat CESI 03 ATEX 323 Caratteristiche tecniche Technical specifications Caract ristiques techniques Alimentazione Power supply Alimentation 12 24Vdc 10 15 Uscita Output Sortie 4 20mA Lineare Linear Lin aire Campo di misura Standard range Champ de mesure 0 300ppm Massimo sovraccarico Max overload maximum surcharge 1000ppm Ripetibilit Repeatability R p titivit 10 Tempo di risposta Ts Response time Ts Temps de r sponse lt 30 secondi seconds secondes Tso Deriva a lungo termine in aria pulita lt 20 anno Long time drift in pure air D rive long terme en air non pollu lt 20 year lt 20 an Vita media in aria pulita 18 mesi month mois Expected life in pure air Dur e de vie moyenne en air non pullu Temp umidit di funzionamento 10 40 C 5 90 r h 40 C Operation Temp Humidity Temp rature et humidit de fonctionne ment Temp umidit di immagazzinamento 5 20 C 5 95 r h Storage Temp Humidity Temp rature et humidit de stockage Variazione de
4. ielded wire The Table below shows the average resistance of some wires depending on their section Section Resistance 2 x 0 75mm 260hm Km 20 Ohm Km 14 Ohm Km 8 Ohm Km Positioning The TS293EA must be installed in the vertical position with the sensor housing placed downward Normally the transmitter should be installed at about 30 50cm from the ceiling to protect people from the Ammonia toxicity Wall mount the unit by two screw anchors Electric connections are to be carried out using the three pole terminal See special instructions enclosed with the gas detectors It is not necessary to use shielded cables Transmitters can be mounted at a max distance of 300 meters from the gas detector when 3x1 5mm cables are used and 600 meters with 3x2 5 mm cables With 12Vdc gas detectors power supply output WARNING Warning When the transmitter is powered for the first time of after a long time inactivity the sensor needs about 10 30 seconds to be reset to the normal operational conditions Cross sensitivity A cross sensitivity phenomenon with other gases may occur see Table 1 IMPORTANT WARNING in case of alarm situation owing to an Ammonia leakage it have to be always checked the sensor working as indicated in this page If the Ammonia concentration is higher than full scale 300ppm it could be necessary to replace the sensor Calibration and or Verification We advise to carry out working testing and or calibration
5. llo Zero Zero Shift D rive du Zero lt 15ppm Dimensioni Size Dimensions 190 x 105 x 83 mm IST 2293 EA01 01 Istruzione User s Manual Manuel d utilisation Pag 3 6 DESCRIPTION The TS293EA consists of a two wire 4 20mA linear transmitter able to detect Ammonia NH3 The Ammonia NH is a colourless gas with a very sharp smell A concentration of 50 100 ppm causes irritation of the respiratory system beyond a concentration of 100ppm it causes eyes irritation At 5 000 ppm the Ammonia is lethal Its density as to air is 0 6 therefore it is lighter than air and it normally spreads upwards in the environment Its LEL Lower Explosivity Limit is 15 v v The TWA is 25 ppm and the STEL is 35 ppm an electrochemical sensor cali brated in ppm NH The instrument comprises of a certified enclosure in which the electronic circuit and the connecting terminals are mounted This unit has a downward facing cylindrical section housing the sensor behind a sintered stainless steel flame trap The TS293EA is designed to be connected to TECNOCONTROL gas detecting central systems OPERATIONAL DESCRIPTION The sensitive element used is an electrochemical sensor The calibration is carried out with Ammonia When powered the sensor the sensor is able to detect gas even if it attains the optimum stability conditions after about 48 hours continual functioning After that time we advise to check in clean air the 4mA output If necessary the
6. s bottle and insert it on the Sensor see Fig 4 Open the gas bottle reducers cock so as the flow indicator is between the two stamps 0 2 0 3 I m Wait for about 3 to 5 minutes Then check the value on the multimeter corresponds to 16 x gas concentration the value calculated following the formula here below ma aan 0 Example if the gas bottle is 245ppm and the transmitter range is 300ppm 16x245 the corresponding mA value will be as follows ie 17 06 If necessary adjust the P2 SPAN trimmer to the required mA value Remove the Calibration Tester Wait again for about 5 to 10 minutes and then check the digital multimeter shows 4 mA Disconnect the digital multimeter connect the wire and place again the instrument box cover IST 2293 EA01 01 Istruzione User s Manual Manuel d utilisation Pag 6 6 Cavo schermato Screened Cable Cable a cran Alimentatore Indicatore Power supply Alimentation Receiver Fig 2 TC011 Tester di calibrazione Fig 1 Esempio di collegamento Calibration Tester An example of a wiring connection Exemple de raccordement Tester d talonnage RL Ohm Resistenza di carico Load resistor R sistance de charge 900 800 700 600 Area di funzionamento Allowable oparating region 500 400 300 200 100 0 10 20 24 28 Volts Alimentazione Power Supply Alimentation Tab 1 Interferenza ad altri gas Cross sen
7. sitivity Data with other gases Interference avec autres gaz Gas Gaz Concentrazione Valore rilevato dal sensore Concentration Sensor value detected Valeur relev e par le capteur C Hs0H Alcool etilico Ethanol 1000ppm
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