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Instruction Manual
For potentially contaminating applications and to protect the measurement system against contamination,
installation of the optional seal with centering ring and filter is recommended. See
part numbers.
Remove the protective lid and install the product to the vacuum system following manufacturer's
recommendations for different flanges and fittings. Keep the protective lid for future maintenance.
3.2 Electrical Installation
3.2.1
Grounding
WARNING! Be sure the vacuum gauge and the rest of your vacuum system are properly grounded for
safety as well as intended operation of the equipment. When using KF flanges, metal clamps must be used to
ensure proper grounding.
WARNING! The gauge may only be connected to power supplies, instruments or control devices that
conform to the requirements of a grounded protective extra-low voltage (SELV) and limited power source (LPS),
Class 2. The connection to the gauge has to be fused.
Ground loops, differences of potential, or EMC problems may affect the measurement signal. For optimum
signal quality, please do observe the following:
• Use an overall metal braided shielded cable. The connector must have a metal case.
• Connect the cable shield to ground at one side via the connector case. Make sure the connector case has
direct contact to the cable's shield on its whole circumference. Do not connect the other side of the shield.
• Connect the supply common with protective ground directly at the power.
• Use differential measurement input (signal common and supply common conducted separately).
• Potential difference between supply common and housing ≤18 V (overvoltage protection).
InstruTech
PCM301 Busy Bee
section 1.4
for accessories
Page 11
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