General technical data
Analog inputs | EL3318 |
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Number of inputs | 8 |
Thermocouple sensor types, measured variables | Types B, C, E, J, K, L, N, R, S, T, U (default setting type K), mV measurement |
Connection technology | 2-wire |
Maximum cable length to the thermocouple | 30 m (without protective measures), suitable surge protection must be provided for longer cable lengths |
Resolution | internal 16-bit |
Sampling type | multiplex |
Ground reference | differential |
Conversion time | approx. 2.5 s to 20 ms, |
Input filter cut-off frequency | 1 kHz typ. |
Software filter | 5 Hz... 30 kHz, adjustable, notch characteristic; preset: disabled |
Open-circuit recognition | yes (can be disabled) |
Supports NoCoEStorage | yes, from firmware 01 |
Voltage measurement | EL3318 |
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Measuring range, technically usable | approx. ± 78 mV |
Measuring ranges (nominal) and resolution | ± 30 mV (1 µV per digit, thus max. 32.768 mV can be displayed) ± 60 mV (2 µV per digit, thus max. 65.536 mV can be displayed) ± 75 mV (4 µV per digit, thus max. 131 mV can be displayed, observe technical measuring range) The measuring ranges 30 and 60 mV are executed in software to increase the resolution and always use the same electrical measuring range of ± 75 mV. |
Measurement uncertainty |
Temperature measurement | EL3318 |
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Electrical measuring range used | ± 75 mV |
Measuring ranges | Type B: +200...+1820°C Type C: 0...+2320°C Type E: -100...+1000°C Type J: -100...+1200°C Type K: -270…+1370°C (preset) Type L: 0...+900°C Type N: -100…+1300°C Type R: -50...+1767°C Type S: -50...+1760°C Type T: -200…+400°C Type U: 0...+600°C |
Resolution | Temperature display 0.1/0.01°C per digit, preset 0.1°C Note: internally, 16 bits are used for the calculation up to the FSV; depending on the set thermocouple, therefore, jumps in value > 0.01°C occur with "resolution 0.01°C"; e.g. type K: approx. 0.04°C |
Measurement uncertainty |
Supply and potentials | EL3318 | |
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Power supply for the electronics | via the E-bus | |
Current consumption via E-bus | typ. 210 mA | |
Differential voltage between +TC and -TC | Recommended area of application | respective measuring range |
Destruction limit, short-term/continuous | ±15 V | |
Max. potential of the twisted TC ends to one another (non-isolated/grounded TC) | Recommended area of application | ±2 V |
Destruction limit, short-term/continuous | ±15 V | |
Max. potential UCM (CommonMode voltage) of the twisted TC to GND | Recommended area of application | Not applicable because GND is not accessible |
Destruction limit, short-term/continuous | ||
Max. potential of twisted TC or GND to SGND or 0 V power | Recommended area of application | ±30 V |
Destruction limit, short-term/continuous | ±50 V | |
Electrical isolation: Max. potential of twisted TC or GND to bus side | Recommended area of application and short-term/continuous destruction limit | 500 V |
Communication | EL3318 |
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Configuration | via TwinCAT System Manager |
Width in the process image | max. 16 bytes input, |
Distributed Clocks | - |
Environmental conditions | EL3318 |
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Permissible ambient temperature range during operation | -25°C... +60°C (extended temperature range), from firmware 06 |
Permissible ambient temperature range during storage | -40°C … +85°C |
Permissible relative air humidity | 95%, no condensation |
General data | EL3318 |
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Dimensions (W x H x D) | approx. 15 mm x 100 mm x 70 mm (width aligned: 12 mm) |
Weight | approx. 60 g |
on 35 mm support rail according to EN 60715 | |
Installation position | variable |
Standards and approvals | EL3318 |
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Protection class | IP20 |
Vibration / shock resistance | conforms to EN 60068-2-6 / EN 60068-2-27, |
EMC immunity / emission | conforms to EN 61000-6-2 / EN 61000-6-4 |
Marking / Approval*) |
*) Real applicable approvals/markings see type plate on the side (product marking).
Ex markings
Standard | Marking |
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ATEX | II 3 G Ex nA IIC T4 Gc |
IECEx | Ex nA IIC T4 Gc |
cFMus | Class I, Division 2, Groups A, B, C, D |
Extended features | EL3318 |
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Pluggable connection level | - |
Electrical isolation | - |
TwinSAFE SC | - |
Calibration certificate | - |