Overpressure Test; Leak Test; Removal Of Modifications; Fig. 4-2: Setup For Enclosure Tests - Emerson ROSEMOUNT MLT 2 Upgrade Manual

ATEX Instruction Manual
ETC01035
02/2008

Fig. 4-2: Setup for Enclosure Tests

4.3.1.2 Overpressure Test

A pressure of 37,5 mbar (= 1,5 times the
maximum overpressure specified) has to be
applied to the pressurized enclosure. To do
this, the following has to be performed:
• Carefully apply a pressure of 37,5 mbar to
the enclosure and hold this pressure for
a period of 2 minutes +/- 10 seconds.
The test is considered satisfactory if no per-
manent deformation occures which would
invalidate the type of protection.
Keep the modifications to carry out the leak
test (sec. 4.3.1.3).

4.3.1.3 Leak Test

The leakage of the enclosure has to be
measured with an overpressure of 25 mbar
applied to the pressurized enclosure. To do
this, the following steps have to be perfor-
med:
Emerson Process Management GmbH & Co. OHG
Tests after Modification or Repair
4.3
MLT 2 / BINOS
• Make sure the modifications as described
in the section 4.3.1.1 still apply.
•
Apply an overpressure of 25 mbar to the
analyzer enclosure and take the reading
of the flow meter.
The test is considered to be satisfactory if the
measured value is acceptable compared to
the following values.
Acceptable flow values are:
• 3 l/min max for single enclosures
• 4,5 l/min max for dual enclosures
The test is considered satisfactory if the
measured value does not exceed the values
given above.

4.3.1.4 Removal of Modifications

Remove all the modifications described in
section 4.3.1.1. Take special care of the gas
connections to be tightend.

100 F
4-7