MKS Granville-Phillips Mini-Convectron 275 series - Overpressure Conditions

1 Safety Instructions
9
Series 275 Mini-Convectron Module with DeviceNet
Instruction Manual - 275563
1.3 Overpressure Conditions
Series 275 instruments are furnished calibrated for N
2
. They also measure the pressure of air correctly
within the accuracy of the instrument. Do not attempt to use a Series 275 Gauge calibrated for N
2
to
measure or control the pressure of other gases such as argon or CO
2
, unless accurate conversion data
for N
2
to the other gas is properly used.
A pressure relief valve should be installed in the system if the possibility of exceeding 1000 Torr
(1333 mbar, 133 kPa, 19 psi) exists.
Suppliers of pressure relief valves and pressure relief disks can be located via an online search, and
are listed at ThomasNet.com under “Relief Valves”. Confirm that these safety devices are properly
installed before installing the product.
In addition, ensure that:
a. The proper gas cylinders are installed,
b. Gas cylinder valve positions are correct on manual systems, and
c. The automation is correct on automated gas delivery systemsVacuum gauges with compression
fittings may be forcefully ejected if the vacuum system is pressurized.
Be aware that when high voltage is present in any vacuum system, a
life threatening electrical shock hazard may exist unless all exposed
conductors are maintained at Earth ground.
This hazard is not peculiar to this product.
Be aware that an electrical discharge through a gas may couple dangerous
high voltage directly to an ungrounded conductor almost as effectively as
would a copper wire connection. A person may be seriously injured or even
killed by merely touching an exposed ungrounded conductor at high potential.
This hazard is not unique to this product.
Install suitable devices that will limit the pressure to the level that the vacuum
system can safely withstand. In addition, install suitable pressure relief valves
or rupture disks that will release pressure at a level considerably below the
pressure that the system can safely withstand.
Series 275 Gauges should not be used above 1000 Torr (1333 mbar, 133 kPa, 19
psi) true pressure.
If accurate conversion data is not used, or is improperly used, a potential
overpressure explosion hazard can be created under certain conditions.
Using the N
2
calibration to pressurize a vacuum system above about 1 Torr
with certain other gases can cause dangerously high pressures which may cause
explosion of the system. See Chapter 4, Operation, before using with other
gases.