3. Disconnect the sensor wires from the data logger and use a digital volt meter to check the
voltage between the red (+) and the black (–) wires. No voltage indicates a problem with
the photodiode, the cable, or the variable shunt resistor.
Symptom: Incorrect solar radiation
1. Make sure the top surface of the sensor head is clean and that the sensor is properly
leveled.
2. Verify that the range, multiplier, and offset parameters are correct for the desired
engineering units and data logger type.
8.2 Maintenance
8.2.1 Cleaning
Keep the sensor clean and treat it as a scientific instrument to maintain the accuracy of the
calibration. The vertical edge of the diffuser must be kept clean to maintain appropriate cosine
correction.
Clean the sensor only with water and/or a mild detergent such as dishwashing soap. Vinegar can
also be used to remove hard water deposits from the diffuser element if necessary.
CAUTION:
Do not use alcohol, organic solvents, abrasives, or strong detergents to clean the diffuser
element. Exposure to alcohol or organic solvents harm the acrylic materials of the sensor,
which will adversely affect the cosine response of the sensor.
8.2.2 Cable replacement
Replacement cables are available from Campbell Scientific. When reconnecting your sensor,
arrows on the connector jacket and an aligning notch ensure proper orientation.
When disconnecting the sensor for an extended period of time, protect the remaining half of the
connector still on the station from water and dirt with electrical tape or another method.
Connectors are designed to be finger-tightened only. The O-ring inside the connector can be
overly compressed if a wrench is used. Pay attention to thread alignment to avoid cross-
threading. When fully tightened, one to two threads may still be visible.
CS310 Quantum Sensor
13
