Lufft Cloud Height Simulator for CHM 8k

The Lufft CH Simulator is an on-site calibration equipment to check the measurement accuracy of the cloud height of the ceilometer CHM 8k.

The simulator is deployed on the top of the ceilometer covering the optical outlet and inlet. A photo diode receives the laser impulse emitted by the ceilometer and, after a certain delay, an integrated LED sends an optical signal back to the ceilometer.

The time span between receiving and sending the signal correlates with the base cloud that the ceilometer shall detect. The duration of the simulator LED pulse corresponds to a cloud thickness.

The characteristics of this simulated cloud is stated in the simulator manual and must be compared with the data output of the ceilometer. The result shows the user if the ceilometer still works in an appropriate way.

The simulator is controlled with an Android tablet using Bluetooth communication or by using serial communication (RS485). The app allows switching between different clouds and in the expert mode the simulation of background light emitted from additional LEDs. Although the simulator works out of the box, the mounting adapter allows a fine tuning in the angle. The UMB communication protocol is embedded in the simulator.


We offer a few variants of the CHM Simulator for simulation of cloud height:

CHM Simulatior - Scope of delivery: CHM Simulator App, CHM Simulator Adaptor Frame, User Manual (Article no. 8349.SIM)
CHM Simulator, incl. Case - Scope of delivery: CHM Simulator App, CHM Simulator Adaptor Frame, Case, Power Cable 10m, incl. cig plug connector (optional: 24V power supply), User Manual (Article no. 8349.SIMco)
CHM Simulator, incl. Case & Tablet - Scope of delivery: Tablet incl. CHM Simulator App, CHM Simulator Adaptor Frame, Case, Power Cable 10m, incl. cig plug connector (optional: 24V power supply), User Manual (Article no. 8349.SIMc)