Fail-Safe Operation; Cleaning The Lens - RayTek GP Series Operating Instructions Manual

Maintenance

6.1 Fail-Safe Operation

The Fail-Safe system is designed to alert the operator and provide a
safe output in case of any system failure. Basically, it is designed to
shutdown the process in the event of a set-up error or a failure in the
sensor head or control electronics.
When an error or failure does occur, the display indicates the
possible failure area, and the output circuits automatically adjust to
their lowest or highest preset level, see the following table.
Display Condition
(flashing)
E111 Over instrument input range
E000 Under instrument input range
E444 Head disconnect
E555 Head
GPR/GPS: >65°C (150°F)
E666 Monitor ambient temperature
>50°C (120°F) or <0°C (32°F)
Note:
With either input type H003 or H004 the under instrument input
range will display low scale for the input device, and the output will
be 4 mA.

6.2 Cleaning the Lens

Keep the lens clean at all times. Any foreign matter on the lens will
affect measurement accuracy. However, care should be taken when
cleaning the lens. To clean the lens, do the following:
Lightly blow off loose particles.
Gently brush off remaining particles with a soft camel hair
brush.
58
ambient temperature
Table 13: Fail-Safe Error Codes
Rev. F 10/2011
mA Output Thermocouple Output
20 mA High value of input range
4 mA Low value of input range
4 mA Low value of input range
4 mA Low value of input range
4 mA Low value of input range
GP Series