protecting workers & facilities: cannabis processing...local annunciation may be employed and...
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OSHA 29 CFR 1910.1000 Table Z-1 Limits for Air Contaminants l PEL: Permissible Exposure Limit as an 8 Hour TWA
ACGIH: American Conference of Governmental Industrial Hygienists
NIOSH IDLH: Immediately Dangerous to Life or Health, The National Institute for Occupational Safety and Health
California Fire Code: Chapter 38 Plant Processing and Extraction Facilities
2018 IFC, The International Fire Code l NFPA 1, The Uniform Fire Code l NFPA 70, The National Electrical Code
NFPA 30, The Flammable and Combustible Liquids Code l NFPA 58: The Liquefied Petroleum Gas Code
UL 1389, Outline of Investigation for Plant Oil Extraction Equipment
Protecting Workers & Facilities: Cannabis ProcessingFixed Gas Detection Technical Brief
www.SensidyneGasDetection.com
GAS HAZARDS
Solvent Extraction is used to remove the
essential oils from plant matter which is then
distilled to separate it into the desired compounds
and remove the solvent.
Common process “solvents” include
Ethanol, other flammable liquids, Butane and
Carbon Dioxide. Most are toxic and highly
flammable while CO2 is toxic and can cause
asphyxiation.
Flammable solvents require storage, piping,
valves and controls for proper process operation
and safety. Monitoring flammable and toxic gases
is mandatory per regulation.
CO2 is another common hazard at these
sites coming from cylinders or a gas burning
generator. Monitoring for Carbon Monoxide (CO),
Carbon Dioxide (CO2), and Natural Gas or
Propane is required when a generator is use.
Process Illustration courtesy of Precision Extraction Solutions
HOW TO MONITOR FOR COMPLIANCE AND TO IMPROVE SAFETY
Building and safety regulations specify the use of gas detection to be installed in specific
areas based on gases to be monitored and the area hazard classification. Codes call for bottom
air make-up ventilation and a listed gas detector within 12 inches of the lowest point for
flammables. Detectors are often placed in front of the exhaust ventilation grills and on the
process equipment near the potential leak points. CO2 is monitored in the waist to face zone as
it is a breathing hazard but heavier than air.
Local annunciation may be employed and gas detection alarm contacts interlock with other
devices and AC power to shutdown the process if an alarm is higher than 25% LFL. Ventilation
fans are activated by a gas alarm of 10% LFL or higher. Indoor gas storage and solvent
recovery areas require their own gas detectors and ventilation.
SENSIDYNE GAS DETECTION EQUIPMENT
Sensidyne has decades of experience in manufacturing fixed gas detection and we
pioneered intelligent gas sensors and universal transmitter in the 1990s. Customers rely upon
our high quality products for asset protection and personnel safety. The staff has decades of
experience in process, industrial, manufacturing and HVAC applications and should be
consulted for specific solutions to dangerous gas exposure and compliance issues.
Founded in 1983, Sensidyne is ISO 9001: 2015, EN 13485: 2003 certified. Fixed gas
detection has global approvals for hazardous (classified) areas, SIL 2, sensor performance
certifications, CE Mark, and RoHS. Every team member is charged with delivering products and
solutions that are effective and robust for customer satisfaction.
CAS
Number
Chemical
Name
OSHA PEL
8 Hour TWA
ACGIH STEL
15 Minutes
NIOSH IDLH
30 Minutes
Flammability
LFL %Volume
Flash Point
°F / °C
Vapor Density
Air = 1.0
124-38-9 Carbon Dioxide 5,000 ppm 30,000 ppm 40,000 ppm Nonflammable - - 1.50
64-17-5 Ethanol 1,000 ppm 1,000 ppm 3,300 ppm 3.3% 57° / 14° 1.50
106-97-8 Butane 800 ppm 1,000 ppm 1,600 ppm 1.8% Gas 2.10
67-63-0 Isopropyl Alcohol 400 ppm 400 ppm 2,000 ppm 2.0% 53° / 12° 1.05
142-82-5 Heptane 400 ppm 500 ppm 750 ppm 1.1% 25° / -4° 3.50
110-54-3 Hexane 500 ppm 50 ppm TWA 1,100 ppm 1.1% -7.6° / -22° 3.00
108-88-3 Toluene 200 ppm 300 ppm Ceiling 500 ppm 7.1% 40° / 4° 3.10
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Non-Intrusive User Interface
Horizontal or Vertical Conduit Entry
3-wire Design with 4-20mA Output
Modbus®, BACnet® and Relays Offered
FM Class I, Div. 1 & 2; ATEX Zones 1 & 2
Bright LED Display or OEM Blind Models
More Than 25 Serviceable Sensor Types
COST-EFFECTIVE ADVANCED GAS DETECTOR
SensAir is based on decades of proven gas detector
design. The result is a performance certified advanced product
with greatly enhanced capabilities, including an easy to use
non-intrusive user interface, clear LED display and intuitive
configuration and maintenance functions, which are accessed
with a magnetic stylus.
Transmitter enclosure material options are offered along
with horizontal or vertical conduit mounting and accessories for
duct mounting, sample draw and remote gassing.
Communication options have been expanded to include
Modbus®, BACnet® and Alarm relays in addition to 3-wire,
4-20mA. More than 25 gas sensor types are offered.
Combustibles, Toxics
and Oxygen Gas Detection
GAS DETECTION SYSTEM CONTROLLERS
Sensidyne offers Digital Gas Detection Controllers to power,
display and provide output and alarm functions that are required by the
safety systems user and engineers. Input capacity ranges from 4, 8
and 16 gas detectors to a maximum of 64. Signal output protocols
include discrete 4-20mA, RS 485 Modbus®, Ethernet and contacts.
The controllers are hazardous area approved for installation in a
Class I, Division 2 classified environment and to receive inputs from
gas detectors in a Class I, Division 1 hazardous (classified) area.
Alarm relays are provided for annunciation and mitigation
measures such as fans and process shutdown. Fail-safe operation is
standard with supervisory alarm notifications for Fire and Building
Automation systems. An alarm acknowledgement function is provided
and a gas detection system UPS is required by the fire code. 4-Channel 9000 8/16 Channel 7100
Cannabis February 6, 2019