ML435 | v23
Page
2
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
1500 NI/min max.
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:
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).
/IS Terminal Box:
Stainless steel, for intrinsically safe circuits only, c/w blue terminals,
front access cover and lower removable gland plate.
Power Interlock Switch:
Volt Free contacts for the connection of Intrinsically Safe Circuits.
Alarm Switch:
Volt Free contacts for the connection of Intrinsically Safe Circuits.
Intermediate Switch:
Volt Free contacts for the connection of Intrinsically Safe Circuits.
System Purging Switch (Optional): Volt Free contacts for the connection of Intrinsically Safe Circuits.
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.
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.
