GENERAL DESCRIPTION
HOLLY IS A DEVICE WHICH HAS BEEN SPECIALLY DESIGNED FOR DETECTING MICRO-PERFORATIONS
IN IONIC EXCHANCE MEMBRANES. A TYPICAL DEFECT OF THESE MEMBRANES IS MICRO-PERFORATION
DUE TO THEIR MOVEMENT WITHIN THE ELECTROLYZERS. THE IDENTIFICATION OF
THE MICRO-PERFORATIONS TAKES PLACE VIA AN AUTOMATIC CYCLE WHICH NARROWS
THE LOCATION OF THE MICRO-PERFORATION TO A RESTRICTED AREA AND USE A PROBE
TO DEFINE ITS EXACT POSITION. HOLLY IS EQUIPPED WITH A DEPRESSED POROUS
SURFACE WHICH RECEIVES THE MEMBRANE AND A FRAME WHICH IS ACTIVED BY FOUR
PNEUMATIC CYLINDERS. INSIDE THE FRAME A SENSOR IS ACTIVATED BY TIMING
BELTS, AND IS LOWERED ONTO THE MEMBRANE THANKS TO TWO PNEUMATIC CLINDERS,
GUARANTEEING CONSTANT SPECIFIC PRESSURE. THE SYSTEM IS EQUIPPED WITH A
THERMO-VENTILATION CYCLE WHICH DIMINISHES THE CHECKING TIME. THE MICRO-PERFORATIONS
ARE IDENTIFIED BY MEANS OF ACOUSTIC AND/OR LUMINOUS SIGNALS LOCATED INSIDE
THE AUTOMATIC SENSOR. A MANUAL SENSOR MAKED A PRECISE INDIVIDUATION OF
THE MICRO-PERFORATION WHICH IS MARKED BEFORE BEING REPAIRED USING A WELNY
WELDING DEVICE. THE MOVEMENT OF EACH INDIVIDUAL BOARD IS MANAGED FROM
A SINGLE CONTROL PANEL LOCATED ON THE SIDE OF THE DEVICE.
TECHNICAL SPECIFICATION
| POWER SUPPLY VOLTAGE |
220V
- 50 Hz
|
| POWER ABSORBED |
2.5
Kw
|
| AUXILIARY VOLTAGE TO CONTROLS |
24
VDC
|
| LINE COMPRESSED AIR PRESSURE |
min.
6 max 8 bar
|
| COMPRESSED AIR CONSUMPTION |
14
Nm³/h
|
| VACUUM BENEATH MEMBRANE WITH MEMBRANE APPLIED |
TYPICAL
-0.7 bar
|
| APPROX. HEIGHT OF WORK SURFACE |
1.20
m
|
PERFORMANCE
| CONTROLLABLE EXPANDED MEMBRANE SIZES | |
| HOLLY-88 |
1310
x 820 mm *
|
| HOLLY-175 |
1310
x 1570 mm *
|
|
HOLLY-250 |
1310
x 2460 mm *
|
| HOLLY-350 |
1310
x 3000 mm *
|
| MINIMUM DETECTABLE PERFORATION SIZE |
"
100 MICRON
|
| EXPLORATION LIMITS |
UP
TO 15 mm FROM INSIDE FRAME EDGE
|
| TYPICAL PRESSURE OF SENSOR ON MEMBRANE |
0.4
N/cm²
|
| SENSOR SPEED |
1
metre/minute
|
| INTERMITTED ACOUSTIC ALARM INSURE PRESENCE OF PERFORATION AUTOMATIC STOPPED INSURE PRESENCE OF PERFORATION NONE STRESS ON THE MEMBRANE NO INSTALLATION TIME IS INVOLVED HOLLY GUARANTEES THAT YOUR MEMBRANE IS CHECKED COMPLETELY IN FEW MINUTE | |
USE PARAMETERS
LINE PRESSURE NO LOWER THAN 5 bar
SENSOR PRESSURE NO LOWER THAN 3 bar
VACUUM REACHED WITH FRAME SEALED AND MEMBRANE IN PLACE (DOWN FRAME) NO
LOWER THAN -0.1 bar.
MEMBRANE TREATMENT
BEFORE CHECKING
THE MEMBRANE MUST BE COMPLETELY WET BEFORE IT IS LOWERED
ONTO THE POROUS SURFACE, SO AS TO GUARANTEE THE CORRECT WORKING DIMENSIONS.
THE MEMBRANE MUST BE CLEARED OF ANY FOREIGN BODIES BEFORE BEING LOWERED
ONTO THE POROUS SURFACE. HAVING LOWERED THE MEMBRANE ONTO THE POROUS SURFACE
AND SEALED THE FRAME, DRY IT WITH A SPONGE OR PAPER TO REMOVE THE FILM
OF WATER, THUS CREATING THE BEST WORKING CONDITIONS.
 STEP-1:THE MEMBRANE IS POSITIONED FROM THE UP POSITION ON THE VACUUM PLANE |
 STEP-2: THE MEMBRANE REMAIN IN POSITION BY THE VACCUM PLANE |
 STEP-3: THE UPPER FRAME GO DOWN - THE SENSOR START TO TEST - STOPS NEAR THE PERFORATION - EMITTED AN ACOUSTIC SIGNAL -THE RELATIVE LAMP LIGHTS UP |
 STEP-4: THROUGHT A MANUAL PROBE THE OPERATION FIND THE EXACTLY POSITION OF THE PERFORATION |
 STEP-5: THE OPERATOR MARKS THE PERFORATION'S AREA |
 STEP-6: THE SENSOR FINISH ITS AUTOMATIC TEST AND GO TO END-STROKE |
 STEP-7: THE UPPER-FRAME GO IN UP-POSITION |
 STEP-8: THE OPERATOR REMOVETHE MEMBRANE TO REPAIR THE MARKER'S ZONE WITH WELNY MACHINE |
