Transmitter LKM203
LKM203 - Transmitter for Resistance Thermometers
The LKM203 is designed for temperature measurements in various industrial applications and specifically developed for resistance thermometers. It converts the sensor's temperature-dependent resistance value into a standard signal of 4…20mA. Lead resistances are largely compensated by the three-wire circuit, although a two-wire circuit is also possible. Sensor, measurement range and optional offset can be adjusted via the USB-C interface and a Windows PC. The software is available for free download.
The QR code on the front of the transmitter links to this homepage, providing easy access to documents and software at any later time.
Ordering options:
1. Default configuration:- No adjustments in the selection menu needed.
- Delivery: The transmitter is delivered with the following configuration: Input: Pt100 (3-wire circuit), Measurement range: 0...100°C, Output: 4...20mA
- Adjustment: Choose your desired sensor and measurement range. Make sure that the selected measurement range is within the technical specifications of the sensor. The minimum span is 20K, the maximum span is 850K.
- Delivery: The transmitter is delivered ready for installation.
Accessories for Your LKM203:
Matching cable sensors: For the operation of your LKM203, we offer high-quality cable probes for resistance thermometers that ensure precise and reliable temperature measurements. Upon request, these can be customized to meet your specific requirements.| Input | Range | Accuracy |
|---|---|---|
| Pt100 | -200 – 850 °C | ±0.1 K |
| Pt1000 | -200 – 300 °C | ±0.1 K |
| Ni100 TK6180 | -60 – 250 °C | ±0.1 K |
| Ni1000 TK6180 | -60 – 170 °C | ±0.1 K |
| Ni100 TK5000 | -50 – 250 °C | ±0.1 K |
| Ni1000 TK5000 | -50 – 200 °C | ±0.1 K |
| Resistance | 0 – 2000 Ω | ±0.05 Ω |
| Value | Remark | |
|---|---|---|
| Loop supply (Iout) | 10 – 35 VDC | reverse polarity protected |
| Max. loop current | 23 mA | at 24 V DC |
| Zero point | -200 – 600 °C | programmable, sensor-dependent |
| Span | 20 – 850 K | programmable |
| Sensor wiring | 2- or 3-wire | |
| Measuring current | 0.25 mA | |
| Resolution | 16 bit input | 14 bit output |
| Linearity error | < 0.1 % FS | |
| Output | 4 – 20 mA | current loop |
| Short circuit | < 4 mA | |
| Sensor break | > 20 mA | |
| Measurement rate | 1 / s | |
| Input terminals | Screw terminals | 0.2 – 1.5 mm² |
| Output terminals | Screw terminals | 0.2 – 2.5 mm² |
| Mounting | 35 mm DIN rail | |
| Operating temperature | -40 – 85 °C | |
| Temperature coefficient | < 25 ppm / K | |
| Humidity | < 95 % | |
| Weight | 60 g | |
| Protection class | IP20 | |
| Dimensions | 89.7 × 17.8 × 60.7 mm | H × W × D |
| Material | Polycarbonate | |
| Vibration | 5 g / 10 – 200 Hz | |
| EMC | EN 61326-1 EN 61326-2-3 |
Emission and immunity |
Documents
| Document | Format | Language(s) |
|---|---|---|
| Datasheet – LKM203 Technical Specification |
  |
|
| Operating Instructions – LKM203 Installation and User Manual |
|
Software
| Program / Package | Format | Language(s) |
|---|---|---|
| Service Program for LKM203 (Windows PCs) Parameterization software |
EXE | |
| Program – AnalogToTemperatur Conversion of analog output values (mA or V) to temperature |
ZIP | |
| Driver (ftdichip.com) USB driver |
Web | |
