Fail-Safe Operation - RayTek Thermalert GP Series Operator's Manual

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3.2

FAIL-SAFE OPERATION

The Fail-Safe system is designed to alert the operator and provide a safe out-
put 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 (as shown in the Table 8).
Table 8: Fail-safe Error Codes
DISPLAY CODE
CONDITION
(flashing)
E111 Over instrument input range
E000 Under instrument input range
E444 Head disconnect
E555 Head ambient temperature
GPM: >85°C (185°F)
GPR/GPS: >65°C (150°F)
E666 Monitor ambient temperature
>50°C (120°F) or <0°C(°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 4mA.
28 Thermalert GP Series Operator's Manual
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15
10 20
5 25
0 30
MA OUTPUT T.C. OUTPUT
20mA High value of
input range
4mA Low value of
input range
4mA Low value of
input range
4mA Low value of
input range
4mA Low value of
input range
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