Connection. Thermocouple. Output (4 ma ma) Power supply Power Rail. Composition

Transcription

1 Converters Connection 1channel nput EEx ia C 24 V DC supply voltage Current output: /4 ma... 2 ma (optional voltage output) Characteristic curve deviation +.1;% Adjustment option via DP switch for temperature measuring range, thermocouple type and output: ma... 2 ma or 4 ma... 2 ma Lead breakage monitoring and deactivation of cold junction compensation Discontinued type hermocouple 8 8 A/D Microprocessor nput EEx ia C ma... 2 ma/ ma... 2 ma Range Upscale/downscale ype Safe area Hazardous area Function D/A he converter is used in conjunction with thermocouples per D/EC for temperature measurements. hermocouple models R, S, B, J,, E and K are suited for this. A current signal of /4 ma... 2 ma is available at the output which is proportional to the temperature. he temperature range is adjustable in levels of C or C. he unit may also be used as a mv converter by a simple adjustment. he measurement range lies between 2 mv mv, the max. span is 8 mv. he measurement range is adjustable in mv levels in this operating mode. An adjustment to the preset measurement range is not required when used as a thermocouple converter or a mv converter. he thermocouple can be directly connected, neither a thermostat nor an external sensor are required for the thermocouple junction. he lead breakage monitoring for the input affects the output through downscaling ( ma) or upscaling (2 ma) (adjustable). nput, output and power supply are galvanically isolated from each other Output (4 ma... 2 ma) Power supply Power Rail Composition 1

2 Supply Connection Power Rail or terminals 23+, 24 Rated voltage Ripple V DC within the supply tolerance Power consumption approx. 1,2 W nput Connection terminals 7+, 8 designed for thermocouples type E, J, K,, R, S according to EC 84 (type B without cold junction compensation, only for ambient temperatures between... 4 C) and type acc. to BS 4937: part 8 Output Connection terminals 16, 17+, 18 Current / ma (adjustable), load 1 kohm Voltage Safety maximum voltage U m ransfer characteristics Deviation After calibration nfluence of ambient temperature Linearisation nfluence of supply voltage nfluence of input current nfluence of load... 2 V, load ;3;kOhm at.1;% error 2 V at 293 K (2 C) mv: ±,1 % of span thermocouple: (deviation of CJC included) ±. C +.1 % of measurement value in C with forced cooling and mm spacing between adjacent units;... ± 1.2 C ± 1 % of measured value in C with 1 mm spacing between adjacent units and natural cooling for an ambient temperature range of K zero point: ± (.2 K +.1 µv)/k Elevated or lowered zero point.8 % of the elevated or lowered value / K (current and voltage output) span, current output: ± (.8 % of span)/k ; voltage output: ±.1 % of span / K.1 % of span <.1 % of span approx..6 µv per Ohm source resistance current output <.1 % of output value per Ohm Longterm stability,2 % of span within 3 days, measured acc. to EC 77: 1984 Response time < 43 ms Electrical isolation nput/output nput/power supply Output/power supply Directive conformity Electromagnetic compatibility Directive 89/336/EC E 812, E 822 Conformity nsulation coordination E 178 Electrical isolation E 178 Protection degree EC 629 Ambient conditions Ambient temperature C ( K) Mechanical specifications Protection degree P2 Mass approx. 1 g Dimensions Data for application in conjunction with hazardous areas ECype Examination Certificate Group, category, type of protection Voltage U 7,1 V Current 7,2 ma Power P 12,7 mw basic insulation acc. to E 178, rated insulation voltage of V AC 4 x 17 x 11 mm (1.6 x 4.2 x 4. in) BASEEFA o. Ex89C23, for additional certificates see [EEx ia] C ( amb = 6 C) Supply Safety maximum voltage U m 2 V ype of protection [EEx ia] Explosion group A B C External capacitance 8 µf 3 µf 1 µf External inductance 4 mh 1 mh mh Electrical isolation nput/output nput/power supply Directive conformity 2

3 Directive 94/9 EC E 14, E 2 Entity parameter Certification number 4Z6A.AX FM control drawing o Suitable for installation in division 2 yes Connection terminals 1, 3 nput Voltage V OC 6,4 V Current t 6, ma Explosion group A&B C&E D, F&G Max. external capacitance C a 3,9 µf 91,76 µf 244,7 µf Max. external inductance L a 78,1 mh mh mh Safety parameter CSA control drawing LR Control drawing o Connection terminals 1, 3 nput Voltage V OC 6,4 V Current SC 6,4 ma Explosion group A&B C&E D, F&G Max. external capacitance C a 36 µf 19 µf 291 µf Max. external inductance L a mh mh mh Supplementary information ECype Examination Certificate, Statement of Conformity, Declaration of Conformity and instructions have to be observed. For information see Accessories Power Rail PR3 Power Rail UPR3 Power feed module KFD2EB2... Power supply of the devices is only permissible via the power feed modules KFD2EB... Via the Power Rail PR3 or UPR3 the devices are supplied with 24 V DC by means of the power feed modules. Each power feed module is used for fusing and monitoring groups with up to individual devices. he Power Rail PR3 is an inset component for the D rail. he Power Rail UPR3 is a complete unit consisting of the electrical inset and an aluminium profile rail 3 mm x 1 mm x mm. o make electrical contact, the devices are simply engaged. he Power Rail must not be fed via the device terminals of the individual devices! f no Power Rails are used, power supply of the individual devices is realised directly via their device terminals. 3

4 otes Function he basis of the device is a microprocessor, which is responsible for the linearisation of the characteristics of the corresponding thermocouple, thermocouple junction compensation, lead breakage evaluation and measurement range adjustment. n the input circuit there is always one amplifier for the thermoelectric voltage terminals 7, 8 and for the sensor for thermocouple junction compensation. A current source is used for the lead breakage monitoring. he current source sends a current of approx. na through the instrument lead. he output values of both amplifiers are transferred to the microprocessor by means of a multiplexer and a digitiser. he microprocessor processes both measurement values according to the functions adjusted by means of the DP switch and offers a current signal proportional to the output via the digitaltoanalogue converter. he output can be chosen by the user between ma... 2 ma or 4 ma... 2 ma (voltage output on demand). hermocouples ype in accordance with D EC 84, section 1 R S B J E K Pt13RhPt Pt1RhPt Pt3RhPt6Rh FeCui CuCui icrcui icri in accordance with BS 4937: Part. 8 Adjustment example: part of a housing side piece platinum 13 %, rhodium/platinum platinum 1 %, rhodium/platinum platinum 3 % rhodium/platinum 6 % rhodium iron/coppernickel copper/coppernickel nickelchrome/coppernickel nickelchrome/nickel icrsi/imgsi O for upscaling the output in case of lead breakage OFF for downscaling the output in case of lead breakage Starting point Span O for 4 ma... 2 ma OFF for ma... 2 ma O (1) ype OFF () Adjustment example ype J () Starting point C () Range C (1) Cold junction compensation O Lead breakage monitoring Upscaling Output ma... 2 ma O for cold junction compensation 4

5 Adjustment of measurement range and thermocouple type ote: he specified accuracy of the characteristic curves is not valid for settings in the marked field. *Accuracy of linearity +.2 % O = 1 OFF = hermocouple B E J J K K R S mv Switch position A L P O S P A max. measurement value units C C C C C C C C C C mv 1. f "downscale of the output" in case of lead breakage is selected, the output current falls off to zero, regardless whether the output configuration is ma... 2 ma or 4 ma... 2 ma. 2. f the switches are in a position, in which the starting point plus the span exceed the admissible maximum value, the output indicates the maximum value (2 ma output current for the version with current output). otes As in the case of all thermocouple converters the accuracy of the cold junction compensation cannot be kept, if the selection switch temperature is very low. his is due to the reduced sensitivity of the thermocouple at low temperatures; i. e. a fault of 1 mv for a thermocouple type K leads to the following faults:.2 C at +2 C.32 C at C.62 C at C * *