Siemens 7MB2335, Operating Instructions Manual, Page: 45 / 168

Start-up
4-3
Operating instructions ULTRAMAT 23 gas analyzer
C79000-B5276-C216-03
ULTRAMAT 23 Type 7MB2335, 7MB2337 and 7MB2338 must be
installed in a suitable enclosure in accordance with EN 60079-15,
taking into account the environmental conditions under which the
equipment will be used.
When the temperature under rated conditions exceeds 70 °C at the
cable or conduit entry point, or 80 °C at the branching point of the
conductors, the temperature specification of the selected cable must be
in compliance with the actual measured temperature values.
Provisions must be made to prevent the rated voltage from being
exceeded by transient disturbances of more than 40%.
4.2 Preparations for Start-up
The pressure can be measured easiest using a U-tube manometer.
Check for leaks in the sample gas paths as follows:
S
Apply approx. 150 hPa (0.1 bar) to the sample gas path
S
Wait for approx. 1 min until the temperature of the inflowing gas has
stabilized
S
Note the pressure
S
Wait another 15 minutes, and note the pressure again.
The sample gas path is sufficiently leak-proof if the pressure has
changed by a maximum of 2 hPa (2 mbar) within 15 minutes.
Gas sampling devices, gas coolers, condensation traps, filters and any
controllers, recorders, or indicators connected should be made ready
for operation (refer to respective Instruction Manuals).
Check that the interfaces (see Chapter 3) are correctly assigned and
parameterized.
ATEX Zone 2
Checking for leaks
Gas conditioning