3.12 Install addional safety equipment
WARNING:
If the control system needs to know the total ow rate of purge gas to the dry
pumping system for safety reasons, install suitable measurement equipment in the
purge gas supply pipeline.
WARNING:
If the gas purges are used to dilute dangerous gases to a safe level, ensure that the
dry pumping system shuts down if the purge gas supply to the dry pumping system
fails.
If the total ow rate of purge gas to the dry pumping system is required to be known for
safety reasons, suitable measurement equipment should be ed in the purge gas
supply pipeline. If ng a rotameter, ensure that it is suitable for use with the purge gas
and that it is correctly calibrated.
Ensure that the installaon is congured so that it remains safe if there is a failure of the
purge gas supply to the dry pumping system.
If an alarm condion is detected, the dry pumping system will shut down automacally.
Ensure that the installaon remains safe if the dry pumping system shuts down
automacally.
3.13 Purge gas set up
There are two types of gas module used on dry pumping systems. Refer to Purge data on
page 18. The gas module conguraon may be adjusted to suit process demands.
Contact our service personnel for instrucon on how to access the gas valves menu (by
the PDT) and for the process‑specic recommendaons.
For dry pumping systems using the medium‑duty gas module, there is an adjustable
needle valve ed to the purge pipe which enables the adjustment of the level of gas
ballast to suit the applicaon.
Use the following procedure to adjust the gas ballast:
1.
Remove the le hand side panel of the dry pumping system.
2.
Idenfy the adjustable needle valve on the purge pipe (contact us for guidance).
3.
Adjust the needle valve unl the required ow is met. Refer to Purge data on page
18 for the purge gas ows.
4.
Ret the le side panel.
For GXS450 and GXS750 dry pumping systems with medium‑duty gas module, there is
an addional electronically controlled gas ballast available for harsh applicaons. By
default, these dry pumping systems are supplied with this addional gas ballast switched
o but it can be enabled using the PDT.
Use the following procedure to enable the addional gas ballast:
1.
Press the SETUP buon on the PDT to enter the SETUP menu.
2.
Scroll using the UP/DOWN keys and select the FIT ACCESSORY menu.
Page 50
M58800880_H - Installaon
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