Page
7
ML548_ES | 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
Pressure characteristics during purge and pressurization of a pressurized enclosure
using a MiniPurge
®
system that incorporates a CLAPS system:
Section 5: Main Components
Air Supply Filter / Regulator
The unit is provided with a 40 μm liquid / dust filter element as a precaution. The user of the MiniPurge
®
system must ensure that air supply is to the quality stated in Air Supply Quality paragraph found in the
Installation of the System section.
Logic Air Supply Regulator
This device provides the system with a stable air supply pressure to the logic system and allows consistent
operation. The pressure level is factory set to 2.5 barg (36 psig) and can be verified by means of the integral
pressure gauge.
Minimum Pressure Sensor
This monitors the pressure inside the pressurized enclosure. When the pressure is below the minimum required
for safe operation, the pressure sensor causes the system to reset and the Alarm / Pressurized indicator turns
Red
.
The sensor is factory calibrated and set to operate in falling pressure at or above the minimum
specified pressure.
Purge Flow Sensor
The Purge Flow Sensor monitors flow through the Purge Outlet Valve. At correct purge flow rates, above the
minimum specified for purging, the sensor sends a signal that activates the purge timer. This sensor is factory
calibrated to operate on falling flow rate at or above the minimum specified purge flow rate.
Intermediate Sensor
This sensor monitors the pressure inside the pressurized enclosure. It senses when the pressure is drops and
provides early warning before the low pressure sensor trips the system. The setting on this is user selectable.
Intermediate Pressure
Sensor Pressure
Power Interlock switch
Alarm &Trip
Purge Time
Machinery Start
Normal Operation
CLAPS Regulator
Pressure
Intermediate switch contacts
open. Intermediate sensor
sends falling pressure signal
Fault Condition - loss of pressure
outside of CLAPS regulation
Minimum Pressure
Sensor Pressure
Purging Pressure
Minimum pressure switch contacts
open. Minimum pressure sensor sends
a low pressure signal.
Alarm indicator shows red (alarm only)
Alarm indicator shows red and power
is disconnected (Alarm and Trip)
Minimum
pressure switch
Intermediate
pressure switch
Power Interlock switch
Alarm Only
Contacts
Active
Inactive
