MKS Stabil-Ion 370 Series, Instruction Manual, Page: 37 / 122

3-1
Series 370 Stabil-Ion Instruction Manual - 370119
Chapter 3
3 Installation
3.1 Gauge Installation Tips
For best results locate pressure gauges close to the point where pressure is to be measured. Gas
sources, long tubulation or other constrictions can cause large errors in indication. Note that if
placed near the pump, the pressure in the gauge may be considerably lower than in the rest of the
system. If placed near a gas inlet or source of contamination, the pressure in the gauge may be
much higher.
To minimize temperature effects, locate pressure gauges away from internal and external heat
sources in a region where the ambient temperature is reasonably constant.
Parts of the gauge can get quite hot during degassing, especially if there is poor ventilation. This will
not damage the gauge. However, care should be taken to prevent low temperature rated materials
such as plastic wire insulation from touching hot parts of the gauge.
3.1.1 EMC Compliance
In order to comply with the standards for immunity as called for by the EMC Directive, careful
consideration to grounding and shielding of instrumentation cables is required. User-supplied
cables must have the drain shield of the cable connected to chassis ground. Immunity to radiated
and conducted RF energy in industrial environments will depend on cable construction and
routing. The VGC system will perform within the typical uncertainty of a Stabil-Ion Gauge system
when subjected to industrial levels of RF energy.
Snap-on ferrite sleeves (G-P p/n 013746, 4 ea. provided) must be installed on the ion gauge cable at
both the gauge tube end and Controller end of the cable. Failure to install these ferrite suppression
cores may result in non-compliance with the EU EMC Standards for Industrial Level Immunity.
3.1.2 Cable Installation Statement
It is intended that all wiring either to or from the Stabil-Ion Gauge Controller unit, whether supplied
by MKS or not, be installed in accordance with the safety requirements of NEC/NFPA 70. Cables
provided by MKS for connection to sensors or transducers is, at a minimum, designed for use as
Appliance Wiring Material (UL category AVLV2), and is constructed of appropriate material and
dimensions for the voltages and currents provided by the Stabil-Ion Gauge Controller unit. It is
emphasized that it is the user’s responsibility to install cables to/from the Stabil-Ion Gauge
Controller unit, whether provided by MKS, or not, in accordance with the applicable local, state,
and national safety requirements.
Raceway and/or conduit may be needed for certain installations.
It is the installer's responsibility to ensure that the automatic signals
provided by the product are always used in a safe manner. Carefully check
the system programming before switching to automatic operation.
Where an equipment malfunction could cause a hazardous situation, always
provide for fail-safe operation. As an example, in an automatic backfill
operation where a malfunction might cause high internal pressures, provide
an appropriate pressure relief device.