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Instruction Manual
Proper Equipment Grounding
2.4.1
WARNING! Hazardous voltages that could seriously injure or cause death are present in many vacuum
processes. Verify that the vacuum connection ports on which the ion gauge and the convection gauges are
mounted are electrically grounded. Consult a qualified Electrician if you are in doubt about your equipment
grounding. Proper grounding of your equipment is essential for safety as well as intended operation of the
equipment. The vacuum gauge transducers and enclosure of any control module must be connected directly to
a good quality equipment earthing conductor. Use a ground lug on the vacuum connection flange of the
pressure measurement devices if necessary.
WARNING! In order to protect personnel from electric shock and bodily harm, shield all conductors
which are subject to potential high voltage electrical discharges in or around the vacuum system.
Electrical Interface and Control
2.4.2
It is the user's responsibility to ensure that the electrical signals from this product and any connections made to
external devices, for example, relays and solenoids, are used in a safe manner. Always double check the system
set-up before using any signals to automate your process. Perform a hazardous operation analysis of your
system design and ensure safeguards and personnel safety measures are taken to prevent injury and property
damage.
Overpressure and use with hazardous gases
2.5
WARNING! Install suitable protective devices that will limit the level of pressure inside your vacuum
chamber to less than what the vacuum chamber system components are capable of withstanding.
In cases where an equipment failure could cause a hazardous condition, always implement fail-safe system
operation. For example, use a pressure relief device in an automatic backfill operation where a malfunction
could result in high internal pressures if the pressure relief device was not installed on the chamber.
The IGM402 and the CVG101 are not intended for use at pressures above 20 psia (1000 Torr); DO NOT exceed
35 psig (< 2 ½ bars) pressure inside the sensor. If your chamber goes to higher pressures, you should install an
isolation valve or pressure relief device to protect the gauge tube from overpressure conditions. With some
fittings, actual safe overpressure conditions may be lower; for example, a quick-connect, O-ring compression
fitting may forcibly release the gauge tube from the vacuum chamber fitting with only a few psi over local
uncorrected barometric (atmospheric) pressure.
CAUTION! If the internal pressure of a vacuum gauge device is allowed to increase above local
uncorrected barometric pressure (atmospheric pressure side), vacuum fittings may release and possible
overpressure conditions may cause leaks that would allow the gas inside the gauge tube to release into the
atmosphere of the surrounding environment. Toxic, pyrophoric and flammable gases are examples of
hazardous gases that if allowed to leak out of the vacuum/pressure containment vessel into the atmospheric
environment, could cause bodily injury and possible damage to equipment. Never expose the gauge tube
internal volume to pressure above local atmospheric pressure when using hazardous gases.
InstruTech
IGM402 Hornet
Page 11
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