EKO INSTRUMENTS CO., LTD. - Pyranometer MS-80/80S/80U - Instruction Manual Ver. 1
Pg. 34
6- 3. Troublesho oting
Read the following in case of any sensor trouble. If any questions should remain, please contact EKO for further
technical support.
Table 6-3. Troubleshooting in field
Failure Action
There is
no output.
MS-80
MS-80U
Make sure that the sensor cable is connected properly to the instrument. To verify the
connection, measure the impedance of output cable [between the “+” and the “-” wires] and
check if the measured impedance is within the proper range as shown in the specification
table.
MS-80S
Make sure that the sensor is properly connected, and type of power supply and voltage values
are appropriate. Also check the communication settings [i.e. port, baudrate, converter ID] are
appropriate.
Output value is too
low
The glass dome maybe soiled with rain or dust. Clean the glass dome with deminaralized
water and soft cloth.
The output may decrease over time. Recalibrate periodically.
Negative output
signal
during night-time.
Pyranometers generate an output signal, which is proportional to the temperature differences
between the sensor’s so-called hot and cold junctions. Night-time offset can occur when the
dome temperature will cool down below the temperature of the detector. A slight negative
offset within the specification can be expected.
Unusual noise
Check the shield connection and make sure it is connected securely.
Make sure if the output cable is not shaking from the wind; take necessary measure by fixing
or lining the cables through metal pipe.
Check for any objects, which emit electromagnetic wave around the instrument and or cable.
When using a data logger or a measuring device with <100MΩ input impedance for MS-80
and MS-80U, a data logger potentially does not measure the sensor output correctly; thus
take following measures in composition:
1. Use a measuring device with input impedance more than 100MΩ
2. Set up the integration time and stability time as long as possible.
3. Use moving average processing on the data
4. Attach 2 or more ferrite cores at the end of the cable.
5. Avoid ground loops. Electrically isolate the pyranometer from the mounting platform.
6. Connect the shield of the cable to the datalogger analog ground.
7. Use a datlogger with differential voltage input.
4-20mA and 0-1V
output outside range
Example) 2mA output
when using 4-20mA.
The fluctuation of
measured current is
large.
If it is confirmed that the wiring is correct, connect the ground wire of this product to the
negative side of the data logger voltage (current) measurement terminal.
Note that the appropriate ground wire connection method for this product may differ
depending on the type of data logger and measurement environment. Select an appropriate
ground wire connection method for this product according to the type of data logger and
measurement environment.
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