Listed below are a few commonly experienced problems and remedial action. These topics are also covered in the Troubleshooting GeoNet Networks, Agent Software Tutorial, and in the GeoNet Troubleshooting Guide, all of which are available at geokon’s website, https://www.geokon.com. Contact geokon if additional assistance is needed.
Symptom: Unit will not respond to communications
□Wrong connection type, or incorrect address specified in Agent software.
□The batteries may be improperly installed. Check their placement.
□The batteries inside the unit may be dead. Replace the batteries.
Symptom: Data Present (e.g., Battery/Signal Strength) but No VW gauge Data Available
□Verify that the gauge leads are wired correctly inside the logger. Refer to the gauge manual for wiring information, or to Section 3.5.1.
□Check the gauge for proper operation with an independent readout, such as a GK-404, GK-405, or GK-406. Gauge operation can also be checked by using an ohmmeter to measure the resistance between the VW gauge leads. Very high (megohms) or infinite resistance may indicate cable damage; very low resistance (<20Ω) may indicate a short between conductors.
□For long cables, add cable resistance of 14.7Ω per 1000 ft (48.5Ω per km) at 20 °C. Multiply this factor by two to account for both directions.
Symptom: Vw gauge reading is unstable
□Move any sources of electrical noise away from the transducer cable, such as generators, motors, arc welding equipment, high voltage lines, etc.
Symptom: Thermistor display shows -273.15 degrees C°
□This indicates an open circuit to thermistor leads. Verify that the thermistor leads are properly connected inside the logger. For wiring information, refer to Section 3.5.1, or to the gauge manual for wiring information.
□Check the thermistor for proper operation by using an ohmmeter to measure the resistance between the thermistor leads. Resistance should be between 10KΩ and 2.4KΩ when the ambient temperature is between 0 and +30 °C. Appendix C details the resistance versus temperature relationship. Very high or infinite resistance may indicate cable damage, very low resistance may indicate a short between conductors.
Symptom: Logger has weak communication
□If the signal is consistently weak (indicated by red and green LEDs illuminated at the same time) but not intermittently red, proceed with the installation. If the signal is frequently lost (red flash) it will be necessary to improve it. Try to get the logger as high as possible, with plenty of clear space around the antenna. Extending the sensor cable may enable moving the logger to a better location. If the signal does not improve, a higher gain directional antenna may be necessary. Contact geokon for assistance.
Symptom: Logger does not have power
□Ensure that the polarity of the batteries matches the diagram on the battery holder. Also check that the batteries are firmly seated.
□The batteries may be improperly installed. Check their placement.
□The batteries inside the unit may be dead. Replace the batteries.
Symptom: Logger will not synchronize with network
□If the red status light on a logger is flashing at 10 second intervals, it means the logger was once connected to a network, but the network is not present now, or the gateway has been reset, resulting in an equal but not overlapping radio cycle.
□Ensure that the network is functioning in deployment mode (red light flashing every 10 seconds on the gateway), and that the channel setting is correct. Follow the steps in Section 4.3 to remove and reinsert the batteries in the logger.
Symptom: No Data From Logger
□Be sure logger is powered.
□With network in deploy mode, observe either red and green lights only, or green lights every 10 seconds, on the logger.
□Make sure network time is set.
Symptom: Green Light flashes slowly (once per second)
Bootloader is activated, complete the following:
1.Change channel switches to a valid setting.
2.Press the Reset button on the circuit board.
Symptom: Green and Red Light Alternating
□Device malfunction, contact geokon.