7.4.3
FL20K foreline trap
The foreline trap (Figure 4, item 9) minimises oil vapour backstreaming from the backing-pump
and is recommended where the highest system cleanliness is required.
Foreline trap
Item Number
FL20K
A133-05-000
7.4.4
TAV vent-valve and vent-port adaptor
A solenoid-operated vent-valve is available for system venting. The valve is 24 V d.c.,
normally-open, and can be driven automatically from the EXC300M Controller.
The
solenoid-valve can be fitted in place of the manual vent-valve or it can be fitted directly to the
purge port. Alternatively, it can be fitted with the adaptor supplied and then used with any
suitable NW10 flanged port on your vacuum system.
An NW10 to
1
/
8
-inch BSP male adaptor is also available. This adaptor allows the vent-port to be
used with any suitable NW10 fitting and incorporates a removable fixed-flow restrictor.
Product
Item Number
TAV vent-valve
B580-66-010
NW10 to
1
/
8
-inch male adaptor
B580-66-011
7.4.5
ACX air-cooler
An ACX air-cooler can be fitted to the EXT250M pump. However, please refer to Section 3 to
check the suitability of air cooling in a particular application.
Air-cooler
Item Number
ACX250
B580-53-150
7.4.6
Vibration isolators
In applications where the small amount of vibration generated by the EXT250M pump is a
problem, a vibration isolator can be fitted. The isolator consists of two special flanges separated
by a flexible bellows and a rubber, anti-vibration, outer collar. The isolator required is dependent
on the pump flange size.
Flange size
Item Number
DN100ISO-K
B580-20-000
DNI00CF
B580-05-000
7.4.7
PRX purge-restrictor
A modified NW10 centring-ring is available to filter the purge gas and restrict its flow rate to the
recommended flow of 25 cm
3
min
-1
(4.17 x 10
-4
l s
-1
). The restrictor is suitable for all EXT250M
pumps fitted with a purge-port.
Purge restrictor
Flange size
Item Number
PRX10
NW10
B580-65-001
EXT250M Turbomolecular Pump
35
