Maintenance; Filter; Regulator - Sentry P2B-ATEX Installation & Operation Manual

Maintenance

Normal control maintenance should require draining the water from the filter bowl and replacing the dirty or clogged
filter element . A lockable shut-off valve, available from other suppliers, is required to perform L .O .T .O . procedures .
Always disconnect air before inspection or maintenance of the control or sampler .
With the relieving type of filter or regulator, outlet pressure can be reduced even though the system is dead-ended .
Turn the adjusting knob counter-clockwise to open the relief passage and allow air to escape .
Clean the filter/regulator bowl with warm water only . The polycarbonate plastic bowls used on these filters/regulators can
become damaged and possibly burst if exposed to such substances as certain solvents, strong alkalies, compressor oils
containing ester-based additives, or synthetic oils . Fumes of these substances in contact with the polycarbonate bowl,
externally or internally, also can result in damage .

Filter

Drain filter as frequently as necessary to keep the liquid level in the bowl below the element mounting stud . If the
liquid level rises above the stud, liquid will be carried into air lines . Replace the filter element when plugged or dirty .
1. Shut off inlet pressure . Turn adjusting knob counter-clockwise until it stops, reducing pressure to zero .
2. Remove the bowl and unscrew the mounting stud to replace the filter element .
3. Clean the plastic bowl using warm water only . If the plastic bowl shows signs of cracking, cloudiness or other signs
of deterioration, replace with a metal bowl . Consult Sentry Equipment Corp for replacement parts .
4. Lubricate the o-ring seal before reassembly . Tighten the element stud and/or bowl to 5-10 in lb .

Regulator

Upon detection of air leaks, pressure fluctuation or creep, the regulator can be disassembled for cleaning .
1. Shut off the inlet pressure . Turn the adjusting knob counter-clockwise until it stops, reducing pressure to zero .
Remove the entire air control assembly by unscrewing two (2) tube fittings and removing the fasteners holding the
four-way valve to the mounting bracket .
2. Unscrew the plastic bonnet from the regulator and carefully remove parts . Observe arrangement of components
for future reassembly .
3. Clean the parts with warm water and soap . Dry the parts and blow out the internal passage in the body using clean,
dry, compressed air .
4. Inspect the parts carefully and reassemble .
5. Tighten the plastic bonnet to 50–60 in-lb .
6. Replace the air control assembly and tighten the panel nut securely .
Sentry P2B-ATEX Controller 9