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D-1
2150EX Area Velocity Flow Module
Appendix D General Safety Procedures
The intrinsically safe 2150EX is intended for use in potentially
explosive atmospheres, and complies with ATEX Directive
94/9/EC. The 2150EX is Group II, Category 1G or 2G equipment
for use in gas hazard zones 0, 1, and 2. For safety information
specific to the 2150EX, refer to the Safety Information section at
the front of this manual.
The safety of the personnel who use the 2150EX is a critical con-
sideration. The following general safety procedures, applicable to
working in and around manholes and sewers, are those used by
Black & Veatch, a respected consulting firm, and are published
here by their permission.
Field personnel must keep safety uppermost in their minds at all
times. When working above ground, rules of common sense and
safety prevail. However, when entering manholes, strict safety
procedures must be observed. Failure to do so could jeopardize
not only your own life, but also the lives of other crew members.
CAUTION
Before you install any flow logger, you must take the proper
safety precautions. The following discussion of safety proce-
dures offers only general guidelines. Each situation in which
you install a flow logger varies. You must take into account the
individual circumstances of each installation.
Additional safety considerations, other than those discussed
here, may be required. Check applicable guidelines, codes, and
regulations of federal, state, city, and county agencies.
D.1 Hazards There are many hazards connected with entering manholes.
Some of the most common hazards are:
• Adverse Atmosphere–The manhole may contain
flammable or poisonous gases or the atmosphere may be
deficient in oxygen. Forced ventilation may be necessary.
• Deteriorated Rungs–Manhole steps may be corroded
and not strong enough to support a man. It may be
difficult to inspect the rungs because of poor lighting.
• Traffic–Whenever manholes are located in the traveled
way, barricades and warning devices are essential to
direct traffic away from an open manhole.
• Falling Objects–Items placed near the manhole opening
may fall and injure a worker in the manhole. All loose
items should be kept away from the manhole opening.