tinb74e1 (2023-01) IRG080.om 7
3 Installation
As a rule, all ionization measurement systems must only be operated
in connection with a properly earthed pump system.
Installation and mounting may only be carried out with the operating
When connecting the vacuum gauges to the vacuum system it must be strictly ob-
served that during operation the gauges are not subjected to mechanical oscilla-
tions, impact or vibrations.
The mounting position of the gauge heads has no influence on proper operation
per se. However magnetic fields can influence the operation of the gauge. Elec-
trons may be deflected by earth’s magnetic field or nearby sources.
The mounting orientation should be such that magnetic field is not perpendicular to
the electron trajectory. This can be obtained aligning the gauge axis to the mag-
netic field.
Any other mounting orientation can be adopted using the mu-metal
intermediate piece 399-891 (Accessories →17).
Exercise caution when install a venting valve in the immediate vicinity. The then
suddenly occurring air flow may result in mechanical damage to the sensitive
cathode.
When installing several gauge heads at one common component (T-piece or cross
for example) an optical separation is required. The gauge heads may not directly
"see" each other. Interactions may cause incorrect measurements.
Humidity at the insulators, caused for example by condensing water,
can give rise to incorrect measurements due to leakage currents.
Fit the gauge head to the vacuum chamber and bolt the CF flange on.
Before connecting the gauge head, it is recommended to pump down
the system and if possible run a vacuum test or a direct leak search.
Connect the gauge head cable set (Accessories →17) to the gauge head
(Fig. 2).
•BNC plug (with metallic shell) →Collector BNC socket (“Collect.”)
•Multipin connector →Multipin socket (“IS”)
The touch-insulated BNC connector included in the the gauge head
cable set must be connected to the IRC081 controller.
Do not use force to connect the plug. When plugging in make sure first that all pins
are lined up in parallel and are straight. Otherwise the current feedthrough can
suffer damage.
Connecting the gauge head
