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General| Brand | Vaisala |
|---|---|
| Model | LM21 |
| Category | Accessories |
| Language | English |
Details on manual revisions, publication dates, and release history.
List of supplementary user guides and technical references for associated Vaisala products.
Covers general safety considerations, warnings, caution notices, and product-specific safety precautions.
Guidelines for handling sensitive electronic components to prevent damage from electrostatic discharge.
Information regarding the standard limited one-year warranty and conditions that may void it.
Provides an overview of the LM21 Background Luminance Sensor and its function in airport RVR systems.
Explains the concept of runway lighting visibility and the role of background luminance measurement.
Guidance on mounting the sensor, optimal orientation, and tilt angle for accurate measurements.
Details on physically mounting the LM21 sensor onto the FS11 Visibility Sensor's support arm.
Procedure for verifying the LM21 sensor's operation and data output after installation with the FS11 system.
Instructions for operating the LM21 sensor when integrated into an FS11 Visibility Sensor system.
Lists the default configuration parameters for the LM21 sensor, such as communication settings and heater status.
Describes how the LM21 sensor measures ambient light, its optical path, and data conversion processes.
Provides information on the LMB201 board, its components, and its role in the sensor's operation.
Specifies the required DC and AC input voltages for the sensor's main unit and heating elements.
Details the RS-232, RS-485, and I²C communication options and their protection features.
Information on the 16-bit Hitachi H8 microcontroller, its clock rate, memory, and watchdog functions.
Describes surge and overvoltage protection mechanisms for communication interfaces and power inputs.
Explains the function of circuits related to heater control, backscatter measurement, and sensor sensitivity.
Details the sensor's ability to monitor window contamination and backscatter, and related commands.
Explains how the sensor calculates and applies compensation for window contamination to ensure accurate readings.
Describes the procedure for checking the sensor's sensitivity using an infrared LED.
Explains the operation of the hood and dew heaters, including temperature stabilization and fault detection.
Instructions for cleaning the LM21 sensor's window and hood to maintain performance and accuracy.
Step-by-step guide for field calibrating the LM21 sensor using the LMA21 calibrator unit.
Procedure for replacing the LMM101 Cover Frame Assembly, including disconnection and reassembly steps.
Instructions for replacing the LM211244 cover subassembly and associated cabling.
Detailed steps for removing and replacing the LMB201 measurement board within the LM21 sensor.
Identifies common error messages, their likely causes, and recommended solutions for the LM21 sensor.
Lists common alarm conditions, their probable causes, and the required corrective actions.
Explains specific indication messages like heater faults and their troubleshooting steps.
Addresses common operational issues such as missing data messages and how to resolve them.
Provides contact details for Vaisala technical support for assistance with manuals or product issues.
Guidelines for returning the LM21 sensor for repair, including problem reporting and packaging requirements.
Details on the physical dimensions, weight, housing material, and mounting options for the LM21 sensor.
Specifies the measurement range for background luminance and the sensor's measurement accuracy.
Information on the sensor's spectral response, peak wavelength, field of view, and lens diameter.
Details on connection types, power supply requirements, heater power, and output signal characteristics.
Specifies the operating temperature range and operating humidity levels for the LM21 sensor.
Information on the LM21's CE compliance and verification standards for radiated and conducted emissions/susceptibility.
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