XTC601 User’s Manual
Michell Instruments
29
OPERATION
2.7.11 Status LED or Light Guide
The Status LED or Light Guide options have identical functionality and take their input
from the same board. Therefore, only one of them can be selected.
For either option the information available is as follows:
Power LED
•
Green LED On – indicates instrument power is on.
Status LED
•
Red LED flashing – indicates when external compensation input or
external sensor is out of range (if either is selected to
ON
ON
). Out of range
is <3.2mA or >21.4mA (see Status Message Table in Section 2.5.1).
•
Red LED On – indicates an internal sensor error or instrument cell
temperature not yet stabilized (see Status Message Table in Section 2.5.1)
– for LED indication this takes priority over external errors.
These have been designed to follow the NAMUR standard.
