Transmitter LKM294 for resistance sensors
The LKM294 is a digital, configurable measuring transducer for mounting on the standard rail and can be adjusted for different resistance sensors according to DIN EN 60751. It converts the temperature dependent resistance value of the sensor into a standard signal of 0...10V or inverse 10...0V. Four DIP switches can be used to set 16 different measuring ranges, one of which can be freely selected. Lead resistances are compensated by means of a four-wire circuit. A three- or two-wire circuit can also be implemented.
The transmitter is supplied configured to customer specifications. Subsequent changes of the sensor and measuring range can be made with our communication interface "LKM S1" with adapter A1 and a PC. The required program is available free of charge in the tab "Downloads".
For a small correction an offset can be set by software.
The following measuring ranges are configurable:
| -100...100°C | -30…70°C | 0...100°C | 0...400°C |
| -50...50°C | -20...80°C | 0...200°C | 0…500°C |
| -40...60°C | -20...150°C | 0...250°C | 0…600°C |
| -30...60°C | 0...50°C | 0...300°C | 1x freely selectable |
The selection menu is available for configuration.
When entering your individual measuring range, please note the measuring range of the selected sensor. This can be found in the technical data. The minimum span is 20°C.
| Sensor | Specified range in °C / Ω |
|---|---|
| Pt100/Pt1000 | -200 – 850 °C |
| Ni100 TK6180/Ni1000 TK6180 | -60 – 250 °C |
| Ni100 TK5000/Ni1000 TK5000 | -60 – 260 °C |
| Resistance | 0 – 4000 Ω |
| Parameter | Value | Remark |
|---|---|---|
| Sensor wiring | 2- / 3- / 4- wire configuration | 4-wire configuration standard |
| Number of ranges | 15 + 1 | 1x freely selectable |
| Measuring current | 0,25 mA | |
| Current consumption | max. 10 mA | |
| Supply voltage | 15 – 35 VDC, 15 – 26 VAC | reverse polarity protected |
| Resolution | 0,1 °C | |
| Linearity error | < 0,1 % | |
| Accuracy | 0,3 % | of measuring range |
| Sampling rate | 2 / s | |
| Output | 0 – 10 V | 10 – V possible via software |
| Sensor break | > 10 V | |
| Short circuit | = 0 V | |
| Terminal type | Screw terminals | 0,2 – 2,5 mm2 |
| Temperature coefficient | < 0,015 K/°C | set temperature range 0 – 100 °C |
| Operating temperature | -40 – 85°C | |
| Dimensions | 75 x 25 x 53 mm | H x W x D |
| Weight | 60 g | |
| EMC | EN 61326-1 EN 61326-2-3 |
emission and immunity |
Documents
| Document | Format | Language(s) |
|---|---|---|
| Datasheet – LKM294 Technical Specification |
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| Operating Instructions – LKM294 Installation and operating manual |
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Software
| Program / Package | Format | Language(s) |
|---|---|---|
| Service Program – LKM294 for Windows-PCs Parameterization Software |
ZIP |  |
| Program – AnalogToTemperatur Conversion of analog output values (mA or V) to temperature |
ZIP | |
