Transmitter LKM281 for thermocouples
The LKM281 is a digital, programmable transmitter with galvanic isolation between input and output for mounting on the standard rail. It can be set for different thermocouples according to DIN EN 60584 and DIN 43710. It converts the temperature-dependent thermoelectric voltage of the sensor by means of 3-wire technology into a standard signal of 4...20mA, 0...20mA or inverse. The temperature compensation takes place in the transmitter itself.
With the increased interference and shock resistance, a wide supply voltage range and the slim design of 6mm, this transmitter is particularly well suited for use in motor vehicles.
It is supplied in a customer-specific configuration. Subsequent changes to the sensor and measuring range can be made via the mini-USB interface on a PC. The required program is available free of charge in the "Downloads" tab.
A zero point controller can be used to make a small correction on site. Additionally, an offset can be set via software.
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 200°C.
| Input: | Te K, J, L, T, U, E, N, S, B, R, C |
Definition range s.Tab. 2 |
| Zero: | Total measuring range | depending on thermocouple |
| Span: | >50 K | |
| Linearity error: | <0,3K | |
| Measurement error | <0,2% | |
| Cold junction error: | <±0,5°C | |
| Supply voltage: | 8...35 VDC | reverse polarity protection |
| Max. Current consumption: | 23 mA | At 24 VDC |
| Galvanic isolation | >2.5 kV | |
| Output: | 4...20mA / 20...4mA / 0...20mA / 20...0mA, 3-L | |
| Sensor break: | >20mA | Typically 21mA |
| Short circuit: | Current value for room temperature | |
| Response time: | <0,5s | |
| TC: | <100ppm/K | |
| Operating temperature range: | -40...85°C | |
| Humidity: | <95% | |
| Mounting: | 35mm DIN rail | |
| Material: | Polyester | |
| Dimensions: | 100 x 6 x 93mm | H x W x D |
| Clamping type: | Screw terminals | Tension clamp terminals possible |
| Clamping range: | 0,2..2,5mm² | |
| Weight: | approx. 54g | |
| Vibration: | 147...500Hz /300 ms2/ 500Hz..2K / 200 ms2 | |
| EMC: | EN 61326-1 EN 61326-2-3 |
Emission and noise immunity |
Temperature neasuring range of thermocouples:
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► Operating instruction in PDF-format
► Service program for LKM26X / 28X
► Program for converting analog output values (mA or V) of transmitters to the corresponding temperature