Ceilometer Alerts - BLVIEW - CL31 - CL51

BL‑View User Guide
Document code
M211185EN
Revision
E
Language
English
Product
BLVIEW
CL31
CL51
Document type
User guide

For more information, see:

  • Vaisala Ceilometer CL31 User Guide
  • Vaisala Ceilometer CL51 User Guide
Table 1. Ceilometer Status, Warnings
Status Message Reason Instructions
Battery failure Battery is dead. Replace the battery.
Battery voltage low The unit has been powered too long using the backup battery. Connect the line voltage or replace the battery.
Battery fails to recharge. If the battery is old, replace it. If the battery is OK, check the operation of ceilometer engine board CLE321.
Blower failure Blower cable is not connected. Check that the blower cable is connected.
Window blower circuit breaker is not ON. Check that the window blower circuit breaker is ON.
Line voltage level is not correct. Check that the line voltage is present and correct.
Blower is stuck. Check if visible obstacles disable blower operation.
Blower is damaged. Replace the blower.
Blower is blowing, but only cool air. The blower heater is malfunctioning. Replace the blower.
Ceilometer engine board failure Non-critical fault in ceilometer engine board CLE321. Replace ceilometer engine board CLE321.
Heater fault Window blower circuit breaker is not ON. Check that the window blower circuit breaker is ON.
Line voltage level is not correct. Check that the line voltage is present and correct.
Heater is damaged. Replace the heater.
High background radiance Direct sunlight. In case there are no alarms, the measurements are OK. If there is an alarm, the measurements are invalid.
High humidity (option) Relative humidity > 85 %. Water has been condensed inside the ceilometer. Leakage in the enclosure or leakage in the door. Take the ceilometer inside, open the maintenance door and let it dry in a warm air conditioned place. Condensed water on optical surface may disturb the measurement. There is a danger of short circuits.
Humidity sensor failure (option) Humidity sensor is not connected. Connect the humidity sensor or disable the option in the software.
Humidity sensor is damaged. Contact technical support and send the ceilometer to Service Center for the humidity sensor to be replaced.
Laser monitoring failure Laser power monitor board CLM311 has failed. Replace CLM311.
Laser power measurement on ceilometer engine board CLE321 has failed. Replace CLE321.
Receiver warning A non-critical CLR321 receiver failure. Replace CLR321.
Tilt angle > 45 degrees warning The unit is not correctly installed or the tilt angle is larger than 45°. Check the installation. The height measurement accuracy is lost with tilt angles greater than 45°.
Transmitter expires Laser diode is too old. Replace transmitter CLT321. The measurement data is valid, but it is possible that some clouds are missed.
Window contamination (appears from time to time and lasts < 5 min) Usually drizzle drops on the window. The blower cleans the window. If clouds are detected, the height information is correct. If no clouds are detected, it is possible that high clouds are missed.
Window contamination (continuous) For example, bird droppings, leaves, or dust have contaminated the window. Clean the window.
Working from battery The unit has battery power left for a maximum of 1 ... 2 hours. Connect the line voltage or replace the battery.
Table 2. Ceilometer Status, Alarms
Status Message Reason Instructions
Ceilometer engine board failure Ceilometer engine board is damaged. Replace ceilometer engine board CLE321.
Coaxial cable failure Coaxial cable disconnected or broken. Verify the connection or replace the coaxial cable.
Light path obstruction Window is badly contaminated or severely scratched. Clean the window or in case of damage, replace CLW311.
Something blocks the laser beam. Check the clarity of the optical path.
Memory error A failure in the CLE321 memory. Replace CLE321.
Receiver failure Receiver CLR321 is damaged. Replace CLR321.
Loose cable connection. Check that the cables from receiver CLR321 and ceilometer optics CLO321 are undamaged and correctly connected.
Receiver test not operating. Check that the optics unit CLO321 is not misplaced or damaged. If the CLO321 unit is damaged or missing, contact Vaisala for repair and replacement, since the CLO321 unit is not field‑replaceable.
Receiver saturation Direct sunlight. Wait for the sun to exit the field-of-view. The ceilometer returns to normal operation.
Something is partially blocking the laser beam. Check the clarity of the optical path.
Transmitter failure Laser is worn out or damaged. Replace laser transmitter CLT321.
Laser does not get electrical power. Check from the status message that the line Voltages is marked OK.
Transmitter shut-off (Laser temperature > 85 °C) Direct sunlight has heated the laser. Wait for the sun to exit the field-of-view. The ceilometer returns to normal operation.
Environment temperature is too high. Check if there is a specific reason for the high temperature.
Voltage failure Ceilometer engine board CLE321 is damaged. Replace CLE321.