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ML564 | v3
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
1000 NI/min initial maximum pressurized enclosure leakage.
1900 NI/min maximum as leakage increases.
Enclosure Material:
Stainless Steel 316L.
Mounting Method:
Wall mounting straps. Fixing holes as per drawing.
Temperature Limits:
Ambient -20
o
C to +60
o
C
Purge air temperature max = 70
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:
5 to 16 barg (73 to 232 psi).
Main Regulator:
Set at 5 barg, 40
μ
m automatic drain supply inlet filter.
Logic Regulator and Gauge:
Fitted and set to 2.3 barg (33 psi).
Process Connections:
Purge supply and outlet to pressurized enclosure 1” NPT female.
Minimum supply line 25 mm (1”) 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 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.
Intermediate Switch:
SPCO switch, contact ratings 250 Vac 4 Amps (AC-15) / 24V DC 4A,
Ex d IIC T6 Gb / Ex tb IIIC T80ºC Db.
System Purging Switch
(Optional):
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.
Intermediate Sensor:
Minimum: 2.0 mbarg.
Maximum: 10 mbarg.
Default Setting: 5.0 mbarg.
Tolerance: -0, +10%.
Note: There must be a 1.5 mbarg difference between the minimum pressure and intermediate sensors.
Purge Flow Sensor:
Set at 6.4 mbarg (Tolerance: -0, +10%).
CLAPS Sensor:
Minimum: 5.0 mbarg.
