Transmitter LKM625
The LKM625 is a digital, programmable transmitter for mounting in an IP64 housing and is designed for semiconductor sensors. The sensors are automatically recognized. It converts the digital I²C signal of the semiconductor sensor into two standard signals of 4...20mA or inverse 20...4mA. Thus sensors with two different measured variables (e.g. temperature and humidity) are supported. If only one channel is used, the second one is set below 4mA. The transmitter is delivered configured according to the customer's requirements. 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".
With one zero point controller each, a small correction can be made on site.
The selection menu is available for configuring the temperature range.
The measuring range for relative humidity is always 0...100%.
Of course, all our I²C-bus sensors are compatible with the LKM625.
| Input: | Semiconductor sensor | for clamp mounting |
| Measuring range temperature: depending on sensor | -20...80°C | configurable via interface |
| Measuring range humidity: depending on sensor | 0...100% | |
| Loop voltage: | 10...35VDC | |
| Output: | 2x 4...20mA | invertible via interface |
 Load: |
max. 700 at 24V | |
| Measuring error temperature: | typ. 0,25°C | at 25°C (SHT31) |
| Measuring error Humidity: | <2% | (SHT31) |
| Operating temperature range: | -30...85°C | |
| Humidity: | <95% | |
| Clamping type: | Screw terminals | |
| Clamping range: | 0,13...1,5mm² | |
| Dimensions: | 48 x 42mm | L x W |
| Weight: | approx. 20g | |
| EMC: | EN 61326-1 EN 61326-2-3 |
Emission and noise immunity |
| Semiconductor chip | Manufacturer | Measured variable |
|---|---|---|
| SHT21, SHT31 | Sensirion | Temperature and humidity |
| MCP9800 | Microchip | Temperature |
| DS18B20 | Maxim | Temperature |
| TMP116 | Texas Instruments | Temperature |
| BMP388 | Bosch Sensortec | Air pressure and temperature |
| MPL3115 | NXP | Air pressure and temperature |
| APDS9300 | Analog Devices | Ambient light |
| OPT3001 | Texas Instruments | Ambient light |
| LKM830/x | Temperature |
| LKM831/x | Temperature and humidity |
| LKM832/x | Air pressure and humidity |
► Operating instructions in PDF format
► Service program for LKM62x
► Program for converting analog output values (mA or V) of transmitters to the corresponding temperature
