Campbell NL100 Manual do Utilizador descarregar pdf (Página 7)

November 2005, ARM-TR-069

Every Six Months

The following are required to perform the six-month checks, maintenance, and sensor verification

(see Appendix B):

• desiccant pack

• second person and radios

• HMI31/HMP35 temperature and RH probe

• assorted tools (wrenches, screwdrivers).

If equipment or sensor replacement is required, the following items may be needed (see

Appendix C):

• replacement parts or sensors

• users manual.

11. Troubleshooting Techniques

1. Communication Outages: The PC communicates with the datalogger through various

peripheral devices (See Appendix G: Wiring Diagrams). Any one of these devices or the

cables connecting them can fail. If a communication outage occurs, check these devices for

power and proper functioning: NL-100, AT-MC13 Fiber Drivers.

2. Failed Temperature and RH sensors: There are six sensors in the aspirated chamber. A

malfunctioning sensor should be obvious as the data from it will be significantly different

from the other sensors. Check for tight connections from the sensor wires to the datalogger

input channels. If connections are tight, a replacement sensor should be installed (see

Appendix C: Sensor Replacement Procedures).

3. Aspirator Fan/Heater Failure: There are two muffin fans at the rear of the aspirated

chamber. There is one located in the datalogger enclosure along with a heater and two

thermostats. If any of the muffin fans fail, check for obstructions and/or that 110V power

is available. If the muffin fan in the datalogger enclosure fails, also check the thermostat

for a proper setting. Turning the thermostat up or down will allow power to the fan. The

same procedure can be used for the heater. See Appendix G: Wiring Diagrams for the AC

Power Wiring Diagram.

4. “Sonde In” Switch Failure: The “Sonde In” switch is a user-operated switch. The switch is

a normally open switch. When the switch is closed 5V supplied by the datalogger is

present on the line. The program looks for any voltage on this line above 0V. There is also

a 100k ohm resistor. If the switch does not work, (1) check the connections, (2) check for

5V on the line, and (3) check for breaks in the cable. If all of the above check out ok then

the switch has gone either bad or there are dirty contacts preventing proper operation of the

switch. Either way, the switch will have to be replaced. See Appendix G: Wiring

Diagrams.

Computer Problems: The computer conforms to the ARM Core PC Standards. Problems with

the PC should be directed to Ron Reed or Tim Martin (630-252-8708). If neither can be reached,

contact the Mentor(s).

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