ELGA
MEDICA-D 7/15 US
Operator Manual
MEDICA-D 7/15 US MANU40550 Version 2
– 05/17
Page 37
6. OPEN the analyzer isolating valve (V
1
).
7. OPEN the emergency by-pass valve.
8. Slowly OPEN the upper bleed nipple on the
0.2µm capsule filter until water, free of bubbles,
flows out. USE an absorbent cloth to prevent
splashing of internal components.
9. The emergency by-pass is now operational.
When the analyzer does not require water it is
necessary to manually isolate the mains water
supply to prevent overflow from the docking
vessel.
Step 4 - Calculate Ion-Exchange Cartridge Life
1. Calculate the maximum ion-exchange cartridge
pack life. Under emergency by-pass processing
and with your mains water conditions, to maintain
a supply purity of 1M
.cm to the analyzer.
Time between
pack changes
=
55,000
(Conductivity of
mains water)
x (Water consumption of
analyzer l/hr)
Example
Mains water conductivity
= 605µS/cm
Water consumption of analyzer = 20l/hr
Time
between
pack changes
=
55,000
605 x 20
Time
between
Pack changes
= 4.5 hrs
In the absence of information on mains water conductivity assume a
pack life of 2 hrs if the analyzer consumes 20 l/hr.
If flow starts to decline this may be solved by changing the 0.2µm filter.
Step 5 - Return to Normal Operation
1. ONCE the unit has been repaired the
MEDICA-D
7/15
US
must be returned to normal operation.
2. RE-CONNECT the mains supply to the inlet of
the
MEDICA-D 7/15 US
and re-adjust supply
pressure.
3. ENSURE the emergency by-pass valve is closed
inside the
MEDICA-D 7/15 US
and REPLACE
right-hand cover.
4. CHANGE ion-exchange cartridge pack and
0.2µm filter.
(See Section 7.2 and Section 7.4).
5. PERFORM 'Initial Start up' routine.
(See Section
5.6).