Transmitter LKM437
Transmitter LKM437 for thermocouples
The LKM437 is a digital, programmable temperature switch for mounting on the standard rail and can be set for various thermocouples DIN EN 60584 and DIN 43710. When the switching point is reached, a potential-free change-over contact relay switches. Two LEDs additionally display the operating status and the switching status optically. The lead resistance of the two-wire circuit can be compensated on site with the setting controller.It can be used in two operating modes:
- Safety shutdown switch - In this case, the self-locking function is activated, and the relay is reset exclusively by switching the "Clear" input to "GND". Optionally, the relay can also be reset with a pushbutton mounted in the cover. The set hysteresis has no influence on the switching behavior.
- Temperature controller - The self-locking function is deactivated. As soon as the set value of the hysteresis is reached, the relay is reset. Resetting with "Clear" against "GND" is not possible.
With a zero point controller a small correction can be done on site. Additionally an offset can be set by software.
For configuration the selection menu is available.
The switching point and the hysteresis can be entered below. Please observe the following notes:
- Switching point, freely selectable in the measuring range of the sensor (see technical data), whole numbers
- hysteresis, freely selectable between 0.1°C and 255°C, the switching value must not leave the measuring range
- An evaluation of measuring resistors is possible with our LKM436.
| Switching output: | Switching output: | |
| Max. Switching capacity: | Relay changer | |
| Supply voltage: | 250VAC; 5A; 1250VA | |
| Max. Current consumption: | 18...34VDC | |
| Sensor: | 25mA | freely selectable |
| Reference junction: | thermocouple type S, K, T, J, B, N, E, R, C, L | |
| Adjustable switching range: | internal | freely selectable |
| Switching accuracy: | according to definition range sensor | |
| Drift of switching point: | better 1°C | |
| Hysteresis: | 100ppm/°C | freely selectable |
| Switching cycles mechanical: | from 1K | |
| Switching cycles electrical: | 1,5x10 7 | |
| Humidity: | 10 5 | |
| Ambient temperature range: | <95% | |
| Mounting: | -40…85°C | |
| Material: | 35mm rail | |
| Dimension: | Polycarbonate | H x W x D |
| Clamping type: | 75x25x53mm | |
| Clamping range: | Screw terminals | |
| Weight: | 0,2...2,5mm² | |
| EMV | EN 61326-1 EN 61326-2-3 |
Emission and immunity |
