SICK GM700 Ex, Operating Instructions Manual, Page: 84 / 102

Error message Description Possible cause/clearance
SIG: M LOW Measuring channel signal too low:
b
Optical interfaces (front window) of SR-unit or
reflector contaminated.
b
Optical axes alignment too inaccurate.
b
Hardware defect.
b
Clean front window, chapter 9.7 .
b
Check optical alignment and correct if necessary,
chapter 7.9 .
b
If not successful, contact Service.
SIG: R HIGH Reference channel signal too high.
b
Contact Service.
SIG: R LOW Reference channel signal too low.
b
Contact Service.
Zero gas measurement for
NH
3
Z MEAS: RANGE Unallowed results during zero gas measurement:
b
Zero gas missing.
b
Optical interfaces (front window) of SR-unit or
reflector contaminated.
b
Optical axes alignment too inaccurate.
b
Check zero gas supply and repair if necessary.
b
Clean front window, chapter 9.7 .
b
Check optical alignment and correct if necessary,
chapter 7.9 .
Sensor Communica‐
tion??? Communication fault between evaluation unit and
GM700 SR-unit Check connections:
b X
Observe safety information for Ex-free zone!
b
Evaluation unit - SR-unit.
b
Lines to SR-unit.
b
Outer plug-in connectors on SR-unit.
b
Inner plug-in connectors in SR-unit.
NOTE
This Table also contains recommended solutions that can only be performed by specially trained personnel.
10.6.2 Warning messages
WARNING
Risk of explosion
Some of the work described in this Chapter assumes an Ex free zone.
b
Wait 20 minutes after switching off the main power supply before opening the enclosure.
Table 23: Warning messages
Warning message Description Possible cause / clearance
Feed Test Gas No detectable sample gas concentration (see Interval).
b
Feed span gas. (GMK)
FIT: LINEPOS Deviation of absorption line position:
b
Line during start process not aligned properly.
b
Wait until the warning message disappears after
a few minutes.
b
Restart device
–
Activate Maintenance mode with maint
button.
– Trigger menu item Reset System or
– switch device off and on again.
b
If not successful, contact Service.
MEAS: REF CONC (only for
device with closed cell) Gas concentration in reference cell too low; measure‐
ment still possible.
b
Plan and prepare reference cell replacement.
DEV: TEMP Optic of SR-unit out of allowed temperature range:
b
Warm-up phase after switching on.
b
Ambient temperature too high.
b
Wait until the temperature has stabilized.
b
Select different ambient temperature range.
b
Cool device.
10
TROUBLESHOOTING
84 O P E R A T I N G I N S T R U C T I O N S | GM700 Ex 8019532/100Q/V1-1/2018-08 | SICK
Subject to change without notice