Promet Eexd Start-Up Purge Procedure - Michell Instruments Promet EExd User Manual

Promet EExd User's Manual
2.6

Promet EExd Start-Up Purge Procedure

1. Before start-up, ensure that all power and signal connections to the
Promet EExd are fully isolated
2. Ensure that all Inlet & Outlet gas connections to the Promet EExd are
made correctly and are leak tight checked.
3. Fully open the flow control valve of the flow meter of each channel.
4. Fully open the sample gas inlet isolation valves.
5. Adjust open the pressure regulators until full scale flow is observed on
each of the water dew-point channels.
6. Allow the sample gas to purge the system for the period of time indicated
in the table below:
Assumes total system pipe length is 3m (9.8') and internal pipe bore is
For every additional 1m (3.3') of pipe work, continue the Gas Purge for
7. After the appropriate purge duration, close the gas inlet isolation valve.
8. Ensure the window is replaced and fully secured before applying the
power.
Michell Instruments
This is a mandatory procedure stipulated in the ATEX/
IECEx certification of the product. The procedure must be
fully carried out prior to the Promet EExd having any power
or signal connections applied. It must also be fully carried
out after the Promet EExd and associated gas handling
equipment has been installed and leak checked. Always
refer to Appendix G.4 - Special Conditions of Safe Use.
This procedure must be carried out at any time following
service or maintenance periods that cause any of the Promet
EExd or associated gas handling equipment pipe work to be
It is not necessary to carry out this procedure if power or
signal connections only have been disconnected.
TOTAL PURGE TIME
must be a minimum of 1 minute at 1 Nl/min (2.1 scfh)
the recommended 4mm (0.16") internal bore.
an additional 15 seconds at 1 Nl/min (2.1 scfh).
disconnected.
INSTALLATION
15