Functions
Part 1 • Page 6-7
Part 1 – Operating Instructions
Rev. 4.00 December 2014
Software version 1.04
EcoRO Dia I/II (HT)
Part 1 • Chapt
er 6
6.2.8
Loop pressure
The following factors determine the pressure ratios in a loop:
•
The maximum consumption (number of dialysis stations and other consumers)
•
The minimum flow speed required (to avoid contamination)
•
The minimum supply pressure at the last tapping point
•
The pipe geometry (pipe cross-section etc.)
The overflow valve
UV1
at the end of the loop must be set according to customer requirements. Without
permeate discharge and maximum performance, the setting pressure via
UV1
should be 2.0–3.5 bar.
The flow speed in the primary loop should reach 0.5 m/s (with full discharge).
6.2.9
Membrane pressure vessel in the loop
The required constant pressure and an adequate supply of permeate is ensured by installing a membrane
pressure vessel. In turn, the size of the vessel and the necessary membrane air pressure depend on the
factors listed under
part 1, chapter 6.2.7 “System production pressure”.
LMW recommends a daily check of the Hydrowatch on the installed membrane pressure vessel (DG).
If the red indicator is visible in the viewing glass, please contact your Lauer Membran Wassertechnik
GmbH service technician immediately.
6.2.10 Prevention of excess pressure in the loop
An increase in pressure after reverse osmosis may well be possible if a butterfly valve is blocking the loop.
The pressure switch
PSAH1
prevents the pressure increasing above the set value. After the system is
switched off, the corresponding message appears on the display
part 1, chapter 14. A faulty expansion
membrane on the surge tank also leads to an increase in pressure when the system is switched on, and
thus to the system being switched off via pressure switch
PSAH1
(factory setting: switch-off pressure =
6 bar / switch-on pressure = 4 bar).
6.2.11 Temperature-dependent discharge
6.2.11.1 Discharge through menu temperature discharge dialysis or standby mode (analogue valve)
When an adjustable start temperature has been reached in the permeate (factory setting: start 35°C / stop
33°C), the system discharges the concentrate via
Y9
depending on
LSHL2
until the temperature drops to
below the stop value.
6.2.11.2 Discharge via alarm evaluation (digital signal)
When the limit temperature set on the temperature limit value controller has been reached, the system
discharges the concentrate via Y9 depending on LSHL2 until the temperature drops below the limit value.
The message “Alarm 21, temperature too high” appears on the display.
6.2.11.3 System stop via error evaluation (digital signal)
When the set limit temperature is exceeded for more than 3 minutes (alarm 21), the system switches off
(consumer protection).
IMPORTANT The Hydrowatch must be checked before and after each chemical disinfection. If the red
indicator is visible, the loop must not be disinfected.
