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3.1.3 Confined space precautions
Explosion hazard. Training in pre-entry testing, ventilation, entry procedures, evacuation/rescue
procedures and safety work practices is necessary before entering confined spaces.
The information that follows is supplied to help users understand the dangers and risks that are
associated with entry into confined spaces.
On April 15, 1993, OSHA's final ruling on CFR 1910.146, Permit Required Confined Spaces, became
law. This standard directly affects more than 250,000 industrial sites in the United States and was
created to protect the health and safety of workers in confined spaces.
Definition of a confined space:
A confined space is any location or enclosure that has (or has the immediate potential for) one or
more of the following conditions:
• An atmosphere with an oxygen concentration that is less than 19.5% or more than 23.5% and/or a
hydrogen sulfide (H
• An atmosphere that can be flammable or explosive due to gases, vapors, mists, dusts or fibers.
• Toxic materials which upon contact or inhalation can cause injury, impairment of health or death.
Confined spaces are not designed for human occupancy. Confined spaces have a restricted entry
and contain known or potential hazards. Examples of confined spaces include manholes, stacks,
pipes, vats, switch vaults and other similar locations.
Standard safety procedures must always be obeyed before entry into confined spaces and/or
locations where hazardous gases, vapors, mists, dusts or fibers can be present. Before entry into a
confined space, find and read all procedures that are related to confined space entry.
3.2 Product overview
Do not use the GS1440 or GS2440EX sensor as a safety device to identify the hydrogen sulfide
concentration in an area. Obey all applicable regulations and occupational health and safety
precautions before entry into confined spaces and toxic hazard environments. Get advice from the
occupational health and safety department at the workplace or the government regulatory body to
identify the possible hazards and safety standards.
The GS1440 sensor is not approved for use in hazardous locations.
The GS2440EX sensor continuously measures the hydrogen sulfide (H
(0–5 mg/L H
S) and air (0–1000 ppm H
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The CAx440EX field transmitter is an accessory for use in explosion hazardous areas (Division 2)
and can be used as an Ex barrier (Division 1) for equipment (e.g., GS2440EX sensor).
The field transmitter is a power supply and a cellular communication device. The field transmitter
supplies power to the GS2440EX sensor and transmits data from the GS2440EX sensor to the Hach
H
S Data cloud server.
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Two batteries or a DC power supply are used to supply power to the CAx440EX field transmitter.
The enclosure of the CAx440EX field transmitter is an IP64/IP67 rated, polycarbonate (PC) case that
can be hung or attached to a wall during use.
The I.S. components supply parameters of the I.S. output entity with an "4-20mA SENSOR CABLE"
terminal and an "RS-232 SENSOR CABLE" terminal.
6 English
S) concentration that is more than 10 ppm.
2
S).
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D A N G E R
D A N G E R
N O T I C E
S) concentration in liquids
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