ML511 | v13
Page
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Expo Technologies UK
T: +44 (0) 20 8398 8011
Expo Technologies US
T: +1 (440) 247 5314
Expo Technologies China
T: +86 532 8906 9858
MiniPurge
®
Control Unit Data
Action on Pressure Failure:
Alarm and Trip (isolate power to pressurized enclosure), user
adjustable Alarm Only.
Type of Operation:
Automatic leakage compensation using the Closed Loop Automatic
Pressurization System (CLAPS System).
Leakage Compensation Capacity:
500 NI/min @ 4barg inlet pressure
Leakage Compensation over
capacity:
+40%(minimum) of the normal enclosure leakage
Enclosure Material:
Stainless Steel 316L.
Mounting Method
Wall mounting straps. Fixing holes as per drawing.
Temperature Limits:
-20
o
C to +55
o
C
Compressed Air Supply:
Clean, dry, oil free air or inert gas. Refer to Air Supply Quality section
in Installation of the System.
Supply Pressure:
4 to 8 barg (60 to 120 psi).
Main Regulator:
Set at 4 barg, 40 mm automatic drain supply inlet filter.
Logic Regulator and Gauge:
Fitted and set to 2.5 barg (36 psi).
Process Connections:
Purge supply and outlet to pressurized enclosure
1
/
2
”
NPT female.
Minimum supply line 13 mm (
1
/
2
”
) ID tube, inlet sized appropriately for
flow rate.
Reference points & signals
1
/
8
”
NPT female, minimum 6 mm pipe to
be used.
Visual Indicators:
Alarm (Red
) / Pressurized (Green
).
System Purging: 4 LEDs that flash sequentially to indicate elapsed
time (black when not purging).
/PA Terminal Box:
Stainless Steel, Ex e IIC T5 Gb / Ex tb IIIC T100ºC Db IP66 Tamb : -20ºC
to +55ºC with terminals, front access cover & lower removable gland
plate.
Stainless Steel, Ex e IIC T4 Gb Tamb : -20ºC to +60ºC with terminals,
front access cover & lower removable gland plate.
Power Interlock Switch:
DPNO switch, contact ratings 250 Vac 4 Amps (AC-15) / 24V DC 4A,
Ex d IIC T6 Gb / Ex tb IIIC T80ºC Db.
Alarm Switch:
SPCO switch, contact ratings 250 Vac 4 Amps (AC-15) / 24V DC 4A,
Ex d IIC T6 Gb / Ex tb IIIC T80ºC Db.
Minimum Pressure Sensor:
Minimum: 0.5 mbarg.
Maximum: 5.0 mbarg.
Default Setting: 1.5 mbarg.
Tolerance -0, +0.7 mbarg.
Purge Flow Sensor:
Set at 6.4 mbarg (Tolerance: -0, +10%).
CLAPS Sensor:
Minimum: 5.0 mbarg.
Maximum:15 mbarg.
Default Setting: 10 mbarg.
Tolerance: -0, +10%
Note: there must be a 2.5 mbarg difference between the intermediate and CLAPS sensor calibration point.
For example: Minimum pressure = 5 mbarg, intermediate pressure = 6.5 mbarg, CLAPS sensor = 9 mbarg.
Purge Time:
User selectable, in 1 minute intervals, up to 99 minutes (tolerance -0,
+3 seconds).