XTP501 & XTC501 User’s Manual
26
99976 Issue 1.1, May 2020
OPERATION
2.7.9 Light Guide
The light guide is fitted to the right-hand side of the lower surface and has a red and
green LED to display the current status.
•
Green On – indicates instrument power is on.
•
Red LED flashing – indicates when external compensation input or external
sensor is out of range (if either is selected to
ON
). Out of range is <3.6
mA or >21 mA (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)
These have been designed to follow the NAMUR NE44 standard.
