Start Clean Up; Economy Mode - Parker MIDIGAS 2 Guia Del Usuario

4.4 Start Clean Up

The clean up cycles are designed to clean the CMS bed of impurities, bring the generator up to production purity more rapidly, and prevent poor
quality gas flowing into the buffer. The operation of the cycle is factory set and is dependant upon the purity as described below:
O2 = 5.00 %
Rapid Cycle
O2 = 100 ppm
Pure Start A
PRODUCTION PURITY
On completion of the start up cycles the N
The Start clean up cycle can be disabled within the customer settings menu (applies only to generators fitted with an O
however Parker domnick hunter strongly recommend that the start up cycles remain enabled.

4.5 Economy Mode

Economy mode is designed to switch the generator into standby mode when there is no demand for gas.
The generator continually monitors the pressure at the outlet port. If the pressure exceeds a pre-determined level for a sustained period of time
(Economy Period *), the N
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back pressure is maintained for an additional 5 minutes, the generator will stop cycling and enter Economy mode.
When the pressure falls below the regulated outlet pressure, the generator will resume normal operation. If the generator is in Economy mode
when this occurs, it will run through the relevant clean up cycle.
The economy mode can be disabled within the customer settings menu (applies only to generators fitted with an O
Parker domnick hunter strongly recommend that this option remains enabled.
The Economy over-ride facility (optional on generators fitted with an O
economy mode. If the over-ride is enabled, a clean up cycle will be performed once every 20 minutes. This allows the generator to go straight
on-line when the outlet pressure falls below the regulated outlet pressure.
*The Economy Period is factory set to 5 minutes, however this can be adjusted during commissioning.
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Rapid Cycle – this cycle is used for lower purity generators (250ppm – 5.0%). The chambers are filled and
exhausted alternately on a fixed cycle time. The Rapid Cycle takes 160 seconds to complete.
Pure Start - The higher purity generators (10 - 100ppm) require a two stage cleaning process (A + B):
A The chambers are filled and exhausted alternately.
B The chambers are then filled and exhausted on a reduced cycle.
The pure start cycle times are dependant upon the production purity of the generator. Refer to the table below for
guidance.
10 ppm
100 ppm
outlet valve will open, allowing gas to be delivered to the application.
2
outlet valve will close. The generator will continue to cycle as normal without delivering gas to the application. If the
PURE START CYCLE (Secs)
A
4 x 120
4 x 90
analyser) can be used to maintain the beds when the generator is in
2
B
120/90
90/70
analyser),
2
analyser), however
2