TROUBLESHOOTING
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Symptom: The pressure indication does not exceed 2 kPa when atmospheric pressure is measured.
• The type of the sensor head differs from the
specified one.
(1) Change it with a specified one.
(2) Adjust or recalibrate with the one currently in use.
• Gas under measurement is not nitrogen.
(1) The type of gas used for calibration of this gas is
nitrogen.
• The sensor head is contaminated or its
filament has worn out.
(1) Replace the sensor head.
• The sensor head or controller is installed in
a place where tempera
ture is high. (This
gauge was calibrated at about 25°C.)
(1) Move the gauge to a clean, well ventilated place not
blown with draft.
Symptom: The needle vibrates and does not indicate a fixed value.
• The type of the sensor head differs from the
specified one.
(1) Change it with a specified one.
(2) Adjust or recalibrate with the one currently in use.
• The sensor head is contaminated or its
filament has worn out.
(1) Replace the sensor head.
• Leak in the sensor head or a leak in the area
where the sensor head is installed.
(1) If there is a leak in the sensor head, replace it.
(2) If the leak is elsewhere, stop it.
• Increased wire resistance due to poor
contact of the sensor head cable or
corrosion of the wire rod.
(1) Check the sensor head cable referring to Fig. 7-5
(2) Replace the sensor head cable.
• The line voltage is not within 100 to 240
VAC.
(1) Hold the line voltage within 100 to 240 VAC.
Symptom: Pointer does not move from the right（Atm pressure）
but it start moving suddenly after the
pressure decreases.
• The gauge has been exposed to high
temperature and high humidity above the
specification for long time.
(1) Use the gauge at condition as listed on the
specification.
(2)
If the same problem occurs in the regular
environment, the gauge needs repair.
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