VACUUBRAND MPT 200 - Manual (Page 9)

page 9 of 20
Documents are only to be used and distributed completely and unchanged. It is strictly the users´ responsibility to check carefully
the validity of this document with respect to his product. Manual-no.: 999226 // 07/10/2011
Use and operation
Notes on operation
Gas Correction factor cold cathode Correction factor Pirani
Air / N
2
- 1.00
CO
2
0.74 0.89
H
2
2.39 0.58
He 5.93 1.02
Ne 3.50 -
Ar 0.80 1.59
Kr 0.60 -
Xe 0.41 -
The vacuum gauge head MPT 100 consists of two components: one cold cathode sensor and one Pirani
sensor. The pressure measurement is dependent on the gas type. The vacuum gauge head is factory-
set for operation with air / N
2
.
Use the following correction factors when working with different gases in the pressure range below 0.1
mbar:
Connecting and starting operation
Vacuum connection:
➨
Remove the protective cover and keep.
➨ Connect the vacuum gauge head via small flange to the vacuum application.
☞ The vacuum gauge head may be mounted in any orientation, though an orienta-
tion is to be preferred in which condensate cannot get into the measuring cham-
ber.
☞ Avoid contamination (oil/oil mist) of the measurement chamber when generating the vacuum with an
oil-filled vacuum pump.
☞ Do not mount the vacuum gauge head directly at the oil-sealed pump. The diameter of the pipelines
should be as large as possible.
☞ Inside a vacuum system where evaporation occurs (e.g. rotary evaporator) the vacuum is not uni-
form. Therefore choose carefully the position where to connect the vacuum gauge head.
☞ Condensate and deposits in the measuring chamber falsify the measurement result.
☞ Soiling and damage effect adversely the function of the vacuum gauge head.
☞ If residues occur or when working with aggressive or condensable substances, install a gas washing
bottle in front of the vacuum gauge head MPT 100.
Electrical connection / VACUU•BUS
Voltage supply and readout of the vacuum gauge head via VACUU•BUS line by the vacuum gauge
DCP 3000 using VACUU•BUS protocol. Maximum cable length inside buildings: 30m. Extension cable
VACUU•BUS 2m: order-no. 612552.
NOTICE