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Instruction Manual
Due to the possibility of corrosion when used in certain environmental conditions, it is possible that the
product's safety could be compromised over time. It is important that the product be periodically inspected for
sound electrical connections and equipment grounding. Do not use if the equipment grounding or electrical
insulation has been compromised.
2.2 Safety Precautions - Service and operation
Ensure that the vacuum port on which the CDM900 is mounted is electrically grounded.
Use an appropriate power source of 13 to 30 Vdc, 0.3 W minimum.
Turn off power to the unit before attempting to service the module.
Turn off power to the unit if a cable or plug is damaged or the product is not operating normally according to
this instruction manual. Contact qualified InstruTech service personnel for any service or troubleshooting
condition that may not be covered by this instruction manual.
Do not use if the unit has been dropped or the enclosure has been damaged. Contact InstruTech for return
authorization and instructions for returning the product to InstruTech for evaluation.
Gauge failures due to contamination or wear and tear are not covered by the warranty. We recommend
checking the zero at regular intervals.
2.3 Electrical Conditions
WARNING! When high voltage is present in any vacuum system, a life threatening electrical shock hazard
may exist unless all exposed electrical conductors are maintained at earth ground potential. This applies to all
products that come in contact with the gas contained in vacuum chambers. An electrical discharge within a
gaseous environment may couple dangerous high voltage directly to any ungrounded conductor of electricity. A
person could be seriously injured or killed by coming in contact with an exposed, ungrounded electrical
conductor at high voltage potential. This condition applies to all products that may come in contact with the gas
inside the vacuum chamber (vacuum/pressure containment vessel).
2.3.1 Proper Equipment Grounding
WARNING! Hazardous voltages that could seriously injure or cause death are present in many vacuum
processes. Verify that the vacuum connection port on which the gauge is mounted is 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 CDM900 must be electrically connected to the grounded vacuum chamber. The connection must conform
to the requirements of a protective connection according to EN 61010:
➔ VCR® connections fulfill this requirement.
➔ For gauges with a KF connection, use a conductive metallic clamping ring.
InstruTech
CDM900 Micro Bee
Page 6
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