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User Guide
Model 4200 Dust & Opacity Monitor
12 Troubleshooting
12.1 Error Codes
Only a limited number of possible errors can be detected by the microprocessor
system in the transmissometer and they are displayed as an error code.
e.g.
ER 15
This signifies a serious malfunction of the system. Contact Land Instruments
International for advice and service.
Error identification table
Identification
Number
Fault
Plus
Plus
Plus
1
M LED Failure
2
F LED Failure
3
M LED Failure
F LED Failure
4
ADC Overrange
5
M LED Failure
ADC Overrange
6
F LED Failure
ADC Overrange
7
M LED Failure
F LED Failure
ADC Overrange
8
Checksum Error
9
Checksum Error M LED Failure
10
Checksum Error F LED Failure
11
Checksum Error M LED Failure
F LED Failure
12
Checksum Error ADC Overrange
13
Checksum Error ADC Overrange
14
Checksum Error ADC Overrange F LED Failure
15
Checksum Error ADC Overrange
F LED Failure
12.2 Flashing Decimal Points
On normal operating display, indicate opacity or dust readings out of the
instrument operating range.
