Transmitter LKM120 for Pt100/Ni100
The LKM120 is a digital, programmable transmitter for mounting in the connection head type B and can be set for Pt100 according to DIN EN 60751 and Ni100 resistance sensors. It converts the temperature dependent resistance value of the sensor into a standard signal of 4...20mA or inverse 20...4mA. Lead resistances are compensated by means of a four-wire circuit. A three- or two-wire circuit can also be implemented.
The transmitter is delivered configured according to the customer's requirements. Subsequent changes to the sensor and measuring range can be made using our "Programming Kit for LKM120/121" and a PC. The required program is available free of charge in the "Downloads" tab.
For a small correction, an offset can be set by software.
The selection menu is available for configuration.
When entering the measuring range, please note that it is between -200 and +600°C for the Pt100 and between -60 and +250°C for the Ni100. The minimum span is 20°C.
| Feature | Value | Remark |
|---|---|---|
| Input | Pt100 / Ni100 | 2-, 3-, 4-wire connection |
| Total measurement range | -200 – 600 °C | Pt100 |
| -60 – 250 °C | Ni100 | |
| Span | programmable | |
| Zero point | programmable | |
| Response time | 0.6 s | |
| Measurement current | max. 0.7 mA | |
| Linearity error | < 0.1 % FS | |
| Loop voltage | 5 – 30 VDC | reverse polarity protected |
| Lead resistance | max. 25 Ω | per lead |
| Resolution | > 14 bit | |
| Load resistor | < 900 Ω | at 24 V |
| Sampling rate | 300 ms | with 50/60 Hz filter, otherwise 100 ms |
| Output | 4 – 20 mA (20 – 4 mA) | programmable, 2-wire current loop |
| Sensor break | > 20 mA | programmable |
| Short circuit | < 4 mA | programmable |
| Terminal type | Spring terminals | |
| Clamping range | 0.2 – 2.5 mm² | |
| Enclosure | Nylon, black | |
| Temperature coefficient | < 100 ppm | |
| Operating temperature | -40 – 85 °C | |
| Dimension | 43.3 × 20 mm | D x H |
| Weight | 32 g | |
| EMC | EN 61326-1 EN 61326-2-3 |
emission and immunity |
Documents
| Document | Format | Language(s) |
|---|---|---|
| Datasheet — LKM120 Technical specification |
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| Operating Instructions — LKM120 Installation and operating instructions |
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Software
| Program / Package | Format | Language(s) |
|---|---|---|
| Service Program — LKM120/121 Parameterization software |
ZIP |  |
| Program — AnalogToTemperatur Conversion of analog output values (mA/V) to temperature |
ZIP | |
