LEYBOLD 157 89, Manual

Page: 18 / 40

2.5 Installing the instrument
The CM 31 has been designed to operate reliably under
all normally encountered industrial conditions (see Sec-
tion 1.2.9).
The instrument is supplied with a rugged table-top hou-
sing. The metal housing is provided with ventilation slits
on the top and bottom. When installing the instrument
within a cabinet, sufficient ventilation must be ensured.
For this, also refer to Section 1.2.9 „Ambient conditions“.
The metal housing also reliably protects the instrument
against electromagnetic interferences (EMI). However,
the CM 31 should be installed away from strong magne-
tic fields, large transformers and motors etc., so that the
instrument cannot be influenced.
2.5.1 Installation
Note
When installing the CM 31, care should be taken so as
not to obstruct the ventilation slits in any way. Also ensu-
re a sufficient throughput of air.
2.5.2 Rack installation
The CM 31 is delivered for installation into a 19“ rack
having 3 height units.
It is inserted into the rack and secured by screwing in
four mounting screws through the holes on front panel.
Mounting screws are included.
2.5.3 Panel installation
The CM 31 is delivered ready for panel mounting. The
required panel cut out is given in Fig. 8.
2.5.4 Using the CM 31 as a table-top
instrument
When using the CM 31 as a table-top instrument a sup-
port stand (Ref. No. 200 60 900) may be fitted to the bot-
tom of the instrument. The support is inserted from the
rear into the lowermost groove of the corner profile and
is then pushed to the front until it engages.
The four adhesive feet (Ref. No. 229 48 120) are atta-
ched under the support stand and under the rear of the
instrument.
2.6 Checking the equipment
functions
2.6.1 TM measurement channels
The THERMOVAC measurement channels are supplied
factory-aligned and does not require any maintenance.
Test gauge T 210 may be used to check important equip-
ment functions. The test gauge is a gauge head simula-
tor for a THERMOVAC gauge head, but it does not sup-
ply calibration values.
By operating the potentiometer it is possible to simulate
any pressure within the range between 5·10
-4
mbar and
atmosphere.
This is especially useful for checking trigger thresholds
and trigger reactions in vacuum systems since this
checking can be carried out without starting up the vacu-
um pumps.
In the event of a fault in the measurement system test
gauge T 210 may be used to determine whether the fault
is with the gauge head, the gauge head cable or the CM
31 itself.
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Fig. 8 Dimensional drawing and panel cutout (dimensions in mm)