LKM457 Channel – Temperature - /moisture probe with 4...20mA output
The LKM457 is a duct temperature / humidity probe with integrated transmitter and two current outputs 4...20mA. It can be used to measure temperature and humidity values in buildings, plants and air ducts. It is suitable for direct connection to evaluation devices with current input such as PC cards or PLCs. The sensor is supplied fully calibrated. Minor corrections can be made on site by means of two controllers.
Via the built-in serial interface, the temperature range can be changed customer-specifically with a PC. In addition, the temperature, humidity in %r.H., dew point in °C and absolute humidity in g/m³ can be displayed. The optional communication interface S1 with adapter A1 is required for this.
The selection menu is available for standard configuration and can be used for typical settings.
These can be specified directly in the optional comment field below the selection menu.
Important Conditions: Please ensure that the measurement range falls within the specification limits of the respective sensor and has a minimum span of 20K. This guarantees that the desired range is technically feasible.
Our team will review your order for feasibility. If any issues arise, we will contact you to find a suitable solution.
Other configurations are also available on request:
Individual sensor tube lengths with Pt100 or Pt1000 in various accuracy classes,
Transmitters with measuring ranges that can be configured on site using DIP switches or a built-in head transmitter that is fully encapsulated in polyurethane (for use in particularly harsh environments).
| Measuring resistor | Specification limit in °C | ||
| Pt100 | -200 | ... | 850 |
| Input: | Semiconductor sensor | integrated |
| Measuring range temperature: | -20...80°C | e.g. 0...50°C possible |
| Measuring range humidity: | 0...100% | |
| Loop voltage: | 10...35VDC | |
| Output: | 2x 4...20mA | |
| Load: | max. 700 at 24V | |
| Measuring error temperature: | typ. 0,5°C | at 25°C |
| Measuring error Humidity: | < 2% | |
| Operating temperature range: | -30...85°C | |
| Humidity: | <95% | |
| Clamping type: | Screw terminals | |
| Clamping range: | 0,13...1,5mm² | |
| Dimensions: | 65x58x265mm | L x W x H, d=14mm |
| Weight: | approx. 100g | |
| Housing: | Polyamide white | glass fiber reinforced |
| EMC: | EN 61326-1 EN 61326-2-3 |
Emission and noise immunity |
► Operating instructions in PDF format
► Service program for LKM45x
► Program for converting analog output values (mA or V) of transmitters to the corresponding temperature