3 Installation
19
Series 275 Mini-Convectron Module with DeviceNet
Instruction Manual - 275563
3.3.1 Environment
To minimize temperature effects, locate pressure gauges away from internal and external heat
sources, in an area where the ambient temperature is reasonably constant.
3.3.2 Location
Where you mount the Mini-Convectron Module is critical to obtaining reliable pressure
measurements. Long tubing or other constrictions can cause large errors in pressure readings. If the
gauge is mounted near the pump, the pressure in the gauge may be considerably lower than in the
rest of the system. If the gauge is mounted near a gas inlet or other source of contamination, the
pressure in the gauge may be much higher than in the rest of the system.
3.3.3 Gauge Mounts
Dimensions of the Mini-Convectron Module and the flange fittings are given in Section 2.2 on page
15.
3.3.3.1 Compression Mount/Quick Connect
Do not use for positive pressure applications. The gauge may be forcefully ejected. The gauge port
is designed to fit a standard 1/2 in. compression/quick connect mounting such as an Ultra-Torr fitting.
Insert the gauge tube port into the compression fitting and finger-tighten the press ring. A light film
of vacuum grease, such as Apiezon
®
, will ensure sealing.
3.3.3.2 1/8 NPT Mount
Fits standard 1/8 NPT female fitting. Wrap the threads of the gauge port with thread seal tape and
hand tighten. Do not use a wrench or tool. Tighten only enough to achieve a seal.
3.3.3.3 NW or Flange Mount
The KF mounting system requires O-rings and centering rings between mating flanges. Tightening
the wing nut will hold the flanges and the aluminum flange clamp together. Maximum pressure for
this style of mounting system is 1000 Torr absolute.
3.3.3.4 ConFlat Flange
To minimize the possibility of leaks with ConFlat
®
flanges, use high strength stainless steel bolts and
a new, clean OFHC copper gasket. Avoid scratching the seal surfaces. To avoid contamination, do
not use nonmetal gaskets.
Finger tighten all bolts. Use a wrench to continue tightening
1
/
8
turn at a time in crisscross order, e.g.,
1, 4, 2, 5, 3, 6, 4 until all flanges are in contact. After contact, further tighten each bolt about
1
/
16
turn.
3.4 I/O Connector Wiring
Cables for connecting the Mini-Convectron to the vacuum system are user supplied. Power to the
module is provided through the DeviceNet connector - see Figure 3-2. The DeviceNet interface
requires a 121 ohm terminating resistor to be installed at each end of the trunk as specified in the
DeviceNet Volume 1, Release 1.2, Section 9.3.4.
Connect the required wiring from the vacuum system to the Mini-Convectron Module.
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