SK00-9663-EI-003-00
58
The output does not reach about 8.0V even at atmospheric pressure
Cause
Action
The gas being measured is not nitrogen.
It is normal. There is a gas species
dependence.
The gas being measured is nitrogen, but it
contains a lot of water and oil.
It is normal. There is a gas species
dependence.
It is an environment with a lot of
deposits.
The sensor may be contaminated.
⇒
Replace the sensor
Room temperature and gas temperature at
the time of adjustment and measurement are
different.
It is normal. It is temperature dependent.
⇒
Adjust the atmospheric pressure
according to the temperature to be
measured.
High altitude
Please consider the pressure difference
due to the altitude.
Atmospheric pressure adjustment is off.
Refer to Chapter 8 and make adjustments.
The filament or temperature sensor is
short-circuited with the case.
Measure the insulation between each pin
and the case.
⇒
Replace the sensor when the
insulation deteriorates.
The voltage does not drop below 1.7V even when exhausted to a vacuum
Cause
Action
Actual pressure is not less than 5×10
-2
Pa.
Check the pressure with an ionization
vacuum gauge.
Room temperature and gas temperature at
the time of adjustment and measurement are
different.
It is normal. It is temperature dependent.
⇒
Adjust the zero point at the
temperature to be measured.
Zero point adjustment is off.
Refer to Chapter 8 and make adjustments.
The filament or temperature sensor is
short-circuited with the case.
Measure the insulation between each pin
and the case.
⇒
Replace the sensor when the
insulation deteriorates.
Internal circuit failure
Check and/or repair at ULVAC is necessary.
The pressure indication does not show a constant value.
Cause
Action
The pressure is actually fluctuating
It is normal.
It is vibrating under the influence of
vibration such as pump.
Please suppress the vibration as much as
possible.
Affected by the principle of the Pirani
gauge.
It is especially susceptible to
atmospheric pressure.
Summary of Contents for G-TRAN SW100-A
Page 7: ...SK00 9663 EI 003 00 VII Revision history Date Number Reason 2022 10 3 00 First edition ...
Page 69: ...SK00 9663 EI 003 00 69 15 EC DECLARATION OF CONFORMITY ...
Page 70: ...SK00 9663 EI 003 00 70 16 UK DECLARATION OF CONFORMITY ...
Page 71: ...SK00 9663 EI 003 00 71 17 Certificate of decontamination ...
Page 72: ...SK00 9663 EI 003 00 72 18 Drawings 18 1 SW100 A R dimensions ...
Page 74: ...SK00 9663 EI 003 00 74 18 3 Display unit cable L ...
