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(1) Concentration display
Check that the gas concentration value is shown on the LCD and the detector is operating.
(2) Sampling gas flow rate
Check that the flow rate icon (on the right top corner of the LCD) is quickly spinning.
Refer to 7-1. 11
“Check for the correct sampling gas flow rate”
When the flow rate icon slowly spins or stops, check the filter element for contaminants. If the
filter element (FE-1) is dirty, replace it with a new one. Refer to 9-1.
“Filter Element
Replacement
” for procedure. If the flow rate icon returns to normal operation (quickly spinning),
check the tubing for clogging or excessive negative pressure.
(3) Airtightness
Check the airtightness of the unit by referring to 7-1.12.
“Check for the airtightness..”
(4) Filter element replacement
Check the filter element for contaminants at least once every 6 months and replace as needed.
The filter element is likely to clog faster in severe environment. If the clogging notification (flow
rate icon slowly spins or stops) appears on the LCD, check the filter element. Replace it with a
new one, if it is dirty. Refer to 9-1.
“Filter Element Replacement” for procedure.
(5) Tubing
Check that tubing has been done correctly at startup or relocation. If the tubing is incorrect, gas
sampling from the target place is not possible and an appropriate flow rate cannot be
maintained.
(6) Sensor unit installation/replacement
Install a new sensor unit into the gas detector at startup. Replace it with a new one every 6
months except for combustible gas sensor units (CHS-7)
.
CHS-7 is divided into two types,
hot-wire combustible (CH) and catalytic (CS). The sensor life of CH and CS types are 5
and 3 years from the installation date respectively.
For procedure, refer to 9-
2. “Sensor Unit
Installation/Replacement
”.
Green POWER LED is on.
Amber TROUBLE LED is off.
Red ALARM LED is off.
Gas concentration
with unit of measurement
(%LEL, ppb, or ppm)
Flow rate icon quickly spins.
