Maintenance; Procedure For Calibration Of Monitoring Devices; Procedure A; Procedure B - BUSCH COBRA NC 0100 B Supplément Au Manuel D'installation Et De Maintenance

aspiration pressure of approx. 10 mbar and with an overpressure at the
exhaust of 300 mbar, does not exceed 174 °C for T3(i).
If a rating is modified at a later date, thereby causing an increase of the
gas temperature; e.g. by the increase of the cooling medium
temperature, the adjustment of the thermostatic valve must be done
accordingly.

Maintenance

Procedure for calibration of monitoring
devices

Procedure A

Dismount the PT100 probe and check it with a calibrated oven or send
the probe to an approved laboratory for inspection.
Reassemble the probe on the pump after checking.

Procedure B

Dismount the pressure sensor and check it by comparing it with a
calibrated pressure sensor or send the sensor to an approved laboratory
for inspection. Reassemble the probe on the pump after checking.

Procedure C

Dismount the pressure switch and check it by comparing it with a
calibrated pressure sensor or send the sensor to an approved laboratory
for inspection. The pressure switch must trip at the prescribed alarm
value when the pressure increases. Reassemble the probe on the pump
after checking.

Procedure D

Remove the vibration sensor from the pump and get it calibrated by a
local calibration service.
Alternatively you can return the sensor for calibration to:
Monitran Ltd
Monitran House
33 Hazlemere Road
Penn
HP10 8AD
UK
info@monitran.com
Use an Analog Current Loop Simulator and Tester 4-20mA to test the
remaining control loop.
Compare and record the trip value, see Table alarm values.
After test of the control loop and calibration of the transmitter, mount
the transmitter back on the pump.

Procedure E

Check that the inductive contact changes state when the ball of the
flowmeter is passing without disassembling the flowmeter or its switch.

Procedure F

Check that the solenoid valve changes state by electrical supply. Visual
inspection of the solenoid valve sealing by means of the flow meter.

Procedure G

Check that the solenoid valve changes state by electrical supply. Visual
check of the sealing at the outlet of the solenoid valve (no liquid
passing).

General information

CAUTION

Information on the maintenance of the pump can be found in the en-
closed installation and operating manual of the COBRA NC 0100 ...
0300 B.
NC 0100...0300 B, Cat. 1
0870549526 (En/ De/ Fr)
Caution
Any servicing on the pumps must only be done by specially trained
servicing staff under strict adherence of current and valid safety
regulations. In the event of possible risks from dangerous substances of
any kind, the user of the pump must duly inform and instruct
maintenance staff before any work is carried out.
Before any maintenance work is carried out, any risk to the health of
maintenance personnel that could come from pumped substances (or
any other substances) from both within the pump or outside, must be
removed. The opening of the vacuum pump is only authorized after it's
come to a full stop and in the total absence of any explosive atmosphere.
In accordance with the Instructions and Operating manual of the
COBRA NC 0100 ... 0300 B, the following servicing may be carried out:
l Checking and cleaning of the water cooling pipework.
l Changing lubrication and cooling oils.
l Checking, cleaning or changing the air filter of the flushing device.
The flame filters of the flame arresters and the on-return valve at the
outlet must be checked for impurities at least twice a year and cleaned if
found dirty. Damaged flame filters (and this includes discoloured flame
filters through heat or visible corrosion on the flame filters as well) must
be removed and changed. For safety reasons, only authorized and
specially-trained personnel as well as professional maintenance staff from
BUSCH may carry out such work.
Other work such as dismantling or rebuilding jobs as well as repair and
maintenance work may only be carried out by BUSCH customer service
engineers.

Flame arresters maintenance

For safety reasons, only authorized and specially-trained personnel as
well as professional maintenance staff from BUSCH may carry out
maintenance on flame arresters.
The following flame arresters are used:
Flame arrester
Vacuum pump
inlet side
Cashco DN 50 3 x 0,3 IIB3
NC 0100 B/
BS&B 930-S50.1/
DN 50
3 x 0.3 / e-vp
Cashco DN 50 3 x 0,3 IIB3
NC 0200 B/
BS&B 930-S50.1/
DN 50
3 x 0.3 / e-vp
Cashco DN 50 3 x 0,3 IIB3
NC 0300 B/
BS&B 930-S50.1/
DN 50
3 x 0.3 / e-vp
Cashco DN 80 4 x 0,5 IIB3
NC 0100 B/
BS&B 930-S80.1/
DN 80
4 x 0.5 / e-vp
Cashco DN 80 4 x 0,5 IIB3
NC 0200 B/
DN 80
BS&B 930-S80.1/
4 x 0.5 / e-vp
Cashco DN 80 4 x 0,5 IIB3
NC 0300 B/
DN 80
BS&B 930-S80.1/
4 x 0.5 / e-vp
Flame arrester
discharge side
Cashco DN 50 3 x 0,3 IIB3
BS&B 930-S50.1/
3 x 0.3 / e-vp
Cashco DN 50 4 x 0,3 IIB3
BS&B 930-S50.1/
4 x 0.3 / eC-vp
Cashco DN 50 4 x 0,3 IIB3
BS&B 930-S50.1/
4 x 0.3 / eC-vp
Cashco DN 50 3 x 0,3 IIB3
BS&B 930-S50.1/
3 x 0.3 / e-vp
Cashco DN 50 5 x 0,4
0530 IIB3
BS&B 930-S50.1/
5 x 0.4 / 1 x 0530/ eC-vp
Cashco DN 50 5 x 0,4
0530 IIB3
BS&B 930-S50.1/
5 x 0.4 / 1 x 0530/ eC-vp
Maintenance
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