4. General Information
16
PNEG-2174
Sampler - Model GRA
Optional Features
The certified drawings indicate which, if any, optional features are included with a sampling system. Some
of the more frequently specified optional features are briefly described in the following list.
1. Controller arranged to initiate a sampling cycle based on quantity or volume of material passing
through conveying line rather than upon elapsed time periods.
2. Explosion-Proof Sampling System. There are several major differences in an explosion-proof
sampler as compared to a standard sampling system. An explosion-proof sampler will typically have
the following features.
a. An explosion-proof solenoid on the directional control valve with the rating of:
Class 1, Groups C and D, Division 1 and 2
Class 2, Groups E, F and G, Division 1 and 2
The explosion proof sampler control is available in two enclosure classifications.
a. The NEMA 9 control with the rating of:
Class 2, Groups E, F and G, Division 1 and 2
b. The NEMA 7 control with the rating of:
Class 1, Groups C and D, Division 1 and 2
Class 2, Groups E, F and G, Division 1 and 2
3. Positive mechanical seals for sealing the sample cutter when slight conveying line pressures
are present.
4. Components of special materials, such as 316 stainless steel, monel, inconel or nedox coatings.
5. Programmable controls to sequence the sampler and the sample collection equipment.
6. Abrasion resistant linings of urethane, AR carbon steel plate, 304 stainless steel or ceramic tile.
Material Sampled
Most materials from light to heavy density granules, flakes, pellets, powders and slurrys.
Sampler Construction
Standard sampler construction is of painted carbon steel or Type 304 Stainless Steel. Other materials
and/or finishes appropriate to the operating environment and the material or product being sampled may
be used. Refer to the certified drawing(s) for any optional or special components installed on the sampler.
