70 • Chapter 6: Maintenance HS-04 Operator’s Manual
Chapter 6: Maintenance
Overview
This chapter describes troubleshooting procedures for the HS-04. It also includes procedures for
replacing the batteries and replacing various consumable parts.
WARNING: RKI Instruments recommends that service, calibration, and repair of RKI gas
detectors be performed by personnel properly trained for this work. Replacing the
sensor and other parts with original equipment does not affect the intrinsic safety
of the instrument.
AVERTISSEMENT: RKI Instruments recommande que le service, l'étalonnage et la
réparation des détecteurs de gaz RKI soient effectués par du personnel
dûment formé à ces travaux. Le remplacement du capteur et d'autres
pièces par l'équipement d'origine n'affecte pas la sécurité intrinsèque de
l'instrument.
Troubleshooting
The troubleshooting table describes error messages, symptoms, probable causes, and
recommended action for problems you may encounter with the HS-04.
Table 11: Troubleshooting the HS-04
Symptoms Probable Causes Recommended Action
• The LCD is blank. • The unit got turned off.
• The batteries needs to be
replaced.
• The battery cover may not be
completely closed.
1. To turn on the unit, press and briefly
hold POWER MODE.
2. Replace the batteries.
3. Be sure the battery cover is
completely closed and that the
screw is tight.
4. If the difficulties continue, contact
RKI Instruments, Inc. for further
instruction.
• The LCD shows an
abnormally high
reading but other gas
detection instruments
do not.
• Humidity filter needs to be
replaced.
• The HS-04 needs to be
recalibrated.
• The sensor needs
replacement.
1. Replace the humidity filter.
2. Recalibrate the unit.
3. If the difficulties continue, replace
the sensor and calibrate.
4. If the difficulties continue, contact
RKI Instruments, Inc. for further
instruction.
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