Tag Archive | "gas detection"

Monitoring of CO, CO2 and Combustible Gases in Indoor Grow Ops


With the recent legalization of marijuana in many North American regions, the cannabis cultivation industry is booming. Greenhouses and other indoor grow rooms provide a structure for growing plants in a controlled environment but can also pose potential hazards to human health. To create favourable growing conditions, reliable heating, cooling and ventilation must be used. Heating may be supplied by sunlight, natural gas, propane gas, fuel oil, wood or electricity. Gas powered equipment may be a source of carbon monoxide if not properly maintained and serviced. Grow lights emit a great deal of heat and can cause combustible gases to ignite. Cooling of the facility is often done by a ventilation system. But there may also be an air conditioning system, which could be a source for refrigerant leaks. Current practices for the commercial cultivation of marijuana and industrial hemp uses Carbon dioxide (CO2) enrichment to increase plant growth and development either using cylinders of liquefied compressed gas or a CO2 generator. CO2 displaces oxygen and can cause an asphyxiation hazard.

 

Two gas detectors should be mounted inside the furnace room – one for monitoring potential leaks in the pipes supplying the gas to the furnace, and the other monitoring carbon monoxide levels generated by the furnace. A well maintained, efficiently burning furnace produces very small amounts of CO, but a dirty, inefficient burning one can product deadly amounts. To monitor the CO levels, an LPT-M-TCO-R should be mounted inside the furnace room at the “breathing zone” (4 -6 ft from the floor). Connected the the LPT-M-TCO-R would be a remote sensor. If the furnace uses propane, an ESH-A-C3H8-100 remote sensor with an internal propane sensor would be used, mounted 6 inches off the finished floor, close to the pipes suppling the gas to the furnace. If the furnace uses natural gas, an ESH-A-CCH4-100 remote sensor with an internal methane sensor should be used instead, mounted 6 inches from the ceiling above the pipes supplying the gas.

 

Inside the room, should be an audible/visual alarm device such as the RSH-24V-R Remote Strobe/Horn. Mounted outside the door of the furnace room would be a QCC Quad Channel Controller. If there are additional entrances to the room, each should have a remote visual/audible alarm device outside the door. Inside the grow room there should be an AST-IS6 carbon dioxide gas detector mounted in the “breathing zone” (4 – 6 ft from the floor) to provide continuous monitoring of CO2 levels. This is especially important if a CO2 enrichment practice is used. The AST-IS6 can be factory set with a range of 0 – 5,000 ppm and one device covers approximately 743 sq m (8,000 sq ft).

 

The LPT-M and AST-IS6 will communicate with QCC, which in turn will display their gas level readings, and in the event of a leak / high gas concentration, will provide an audible alarm and control equipment such as the ventilation system, shut off the furnace, trigger the other remote horn/strobe devices or other set responses as configured using its 3 internal relays. The QCC can be ordered with an optional data logging package and it can be configured to communicate with a Building Automation System. The aforementioned gas detectors/sensors are housed in water / dust tight enclosures, and are IP54 rated with the factory installed splash guard, providing protection for the equipment in wet areas.

 

Typical Indoor Grow Op Monitoring System:

3D-grow-room-QCC

 

About Critical Environment Technologies Canada Inc.

Critical Environment Technologies Canada Inc. is a leading equipment manufacturer for commercial and industrial gas detection applications. We are dedicated to designing, developing and servicing hazardous gas detection systems for a wide range of applications that require monitoring of refrigerants, TVOCs, combustible and toxic gases. CETCI’s products are sold through a worldwide network of authorized distributors. Our knowledgeable Regional Sales Managers are experienced with many application scenarios, including commercial, institutional, municipal and light industrial markets worldwide. Areas of specialization include car parks, refrigeration plants, commercial swimming pools, water purification, including wastewater treatment facilities, ice arenas, wineries and breweries, schools and many more.

For suggestions on gas detection systems, indoor air quality monitors and calibration, please visit

www.critical-environment.com.

Posted in Applications, EducationalComments Off on Monitoring of CO, CO2 and Combustible Gases in Indoor Grow Ops

CETCI Launches the FCS Flexible Control System, a High Performance Gas Detection Controller with Logic Control


Delta, British Columbia, Canada – Critical Environment Technologies Canada Inc. (CETCI) is pleased to announce the release of our FCS Flexible Control System. The FCS replaces the PDC, offering dramatic technological and functional improvements over its predecessor.

The FCS Flexible Control System is a sophisticated, high performance Controller that offers up to 128 gas channel configurations for monitoring toxic, combustible and refrigerant gases with versatile control functionality for non-hazardous, non-explosion rated, commercial and light industrial applications. The FCS is designed to accept inputs from digital and analog transmitters and/or Peripheral Devices (in various combinations), using Modbus® RS-485 or 4-20 mA analog input. In addition, the FCS is available with Modbus® RS-485 output or BACnet® MS/TP output for communicating with a Building Automation System (BAS).

FCS

Standard features include, a full colour, LCD touch screen with LED indicators for Power, Status and Fault, a door mounted audible alarm, an extensive menu structure with password protection, a USB port for firmware upgrades and data downloads, four internal 5-amp, dry contact relays, two configurable switch inputs and two strobe/horn output drives. The built-in data logging capabilities have a large capacity memory for saving all channel readings, configuration changes and transition data. The FCS has a maximum of 32 priorities which can be configured to define the relationships between the channels and the relays, allowing up to. Up to three conditions can be assigned to each relay. Channels can be assigned to report their Low, Medium, High and/or Fault statuses which in turn can be configured to trigger one re more relays to act on one or more of those statuses and channels. The logic control and flexibility of the priority levels is immense, allowing numerous monitoring and alarming configurations.

Optional, value added features include, internal analog inputs (AI) and/or analog outputs (AO), a top mounted strobe and a locking door. The FCS, like our new suite of products, uses our signature black enclosure that is IP54 rated when the optional water tight buzzer is installed at time of order.

Depending on the type and size of the application, the FCS may require additional devices to create the complete system. For networks that extend over a large area there is the potential for data noise and a reduction in the signal. The LNK-XT Network Extender is a signal booster that extends the range of the Modbus communications. An LNK-XT is recommended every 610m (2000ft) and up to 6 of these devices can be used on one FCS network. For very large system application and/or very long wire runs, the Remote Power Supply is available to boost the voltage and provide a renewed amount of power to compensate for voltage drops. The RPS-24VDC converts 90-240 VAC power to 24 VDC power. If more than the four internal relays are needed, two remote devices are available – the RLY-4 which offers four contacts and the RLY-8 that offers eight. All relays are rated at 5 amps. A maximum of 56 relays can be accommodated by the FCS. In the event that the optional internal analog inputs and/or analog outputs are insufficient, there two peripheral devices, the LNK-AI and the LNK-AO available. The LNK-AI offers 4 analog inputs and the LNK-AO offers 4 analog outputs. Depending on the internal AI and AO configurations, up to a maximum of 14 LNK-AO and 14 LNK-AI devices can be connected to the FCS.

The FCS is ideal for use in large, enclosed parking facilities, indoor recreation facilities, food processing plants, refrigeration plants, chemical storage rooms, manufacturing plants and many more.

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CETCI Launches the DCC-MRI Oxygen Monitoring System


Delta, British Columbia, Canada – Critical Environment Technologies Canada Inc. (CETCI) is pleased to tell you about the DCC-MRI Oxygen Monitoring System for MRI room applications in hospitals and clinics. The DCC-MRI replaces our GEM-MRI, offering technological and functional improvements over its predecessor.

Magnetic Resonance Imaging equipment is cooled by compressed gas. Compressed gas, if it leaks will displace Oxygen, creating the potential for an oxygen deficient or hazardous atmosphere. To meet general health and safety protocols, Oxygen monitoring devices are required to be present in MRI rooms. However, due to the strong magnetic field inside the MRI room, electronic equipment tends to not operate properly when mounted inside the room. The DCC-MRI system is designed to be installed on the wall outside of the MRI room with a flexible, sample line running from the inlet port fitting to the sampled environment. The factory tested maximum length of line is 15.24 m (50 ft). The DCC-MRI constantly monitors the target air area and indicates real time Oxygen levels on the LCD display.

The system is designed with an internal flow detector, sample draw pump, adjustable flow meter and an internal LPT-A Analog Transmitter that houses an integral Oxygen sensor. The measurement range of the sensor is 0 to 25.0% volume Oxygen. The alarm is factory configured to a descending alarm set point of 19.5% vol to alert if there is a deficiency of oxygen in the target air area.

DCC-MRI-closed-open

 

Features include two 4 – 20 mA outputs, one alarm level line voltage relay with field configurable time delays and trigger levels, a blocked flow alarm indicating a dirty filter or clogged tubing, a side mounted audible buzzer, an LCD digital display with LED indicators for channel alarm status and fault conditions and a door mounted Silence push button.

The DCC-MRI Oxygen Monitoring System is designed to accurately measure to government established exposure levels for Oxygen deficiency for health and safety.

For more information on the DCC-MRI, please visit www.critical-environment.com/products/dcc-mri.html

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A Dual Channel Gas Detector for Monitoring Hazardous Gases in the Workplace


Critical Environment Technologies Canada Inc, (CETCI) offers strategic and reliable gas detection solutions for many applications. Our DCC Dual Channel Controller is an ideal fixed gas detection system for monitoring indoor air to protect workers from exposure to unhealthy levels of combustible, toxic and refrigerant gases, oxygen deficiency, and volatile organic compounds in the workplace.

The potential for exposure to hazardous gases is a concern in many workplace environments. In fact, every workplace must meet local (provincial/state, COOHS/OSHA, etc.) health and safety standards for hazardous gas exposure during working hours. To ensure the safety of the workers, equipment, and the facility, areas presenting a gas hazard should be monitored by gas detectors. In the larger, open areas, a fixed gas detection system is suitable; in confined spaces that workers enter and where gas may be present, portable gas detectors are more appropriate.

Commercial buildings that share a warehouse with manufacturing and/or service work in the back and offices in the front are a prime place for harmful gases and vapours to be present in the entire workplace area.  Airports, hotels, restaurants, supermarkets, shopping malls, manufacturing plants, food processing plants, vehicle repair shops, wineries, breweries and many more are all examples of workplaces where hazardous gases are used or produced onsite.

CETCI’s DCC Dual Channel Controller offers a fixed, continuous hazardous gas monitoring solution with two gas channels, two programmable relays, two 4-20 mA outputs and one configurable 4-20 mA input, an internal audible alarm, an LCD display with LED indicators and a password protected menu system. The two gas channels can be configured with one or two internal gas sensors, one internal and one remote gas sensor or one remote gas sensor, depending on the application requirements. The internal gas sensor options include toxic gases such as carbon monoxide, nitric oxide, nitrogen dioxide, oxygen, etc. The remote sensor options include refrigerants, TVOCs and combustible gases such as hydrogen, methane and propane. The DCC can also be connected to a remote 4-20 mA transmitter/gas detector such as our AST-IS (CO2), ART (IR refrigerants), LPT (CO or NO2) or LPT-A (various gases). All of our gas detectors come standard in a water/dust tight enclosure with a copper coated interior to reduce RF interference.

Optional, value added features for the DCC include an extra loud door mounted buzzer for noisy environments, a top mounted strobe, an internal heater for cold environment applications, and a door mounted water tight buzzer and splash guard for wet or spray down environments.

The DCC Dual Channel Controller conforms to CSA, UL, CE, FCC and IP54 standards.

 

About Critical Environment Technologies Canada Inc.

Critical Environment Technologies designs and manufacturers indoor air quality and fixed gas detection systems including self-contained systems, controllers and transmitters (analog, digital and wireless). Applications include commercial HVAC, institutional, municipal and light industrial markets worldwide. Many of these applications are for vehicle exhaust, but areas of specialization include refrigeration applications, food processing plants, manufacturing plants, wastewater treatment plants, fisheries, wineries/breweries, pulp and paper mills, recreational facilities, bakeries, greenhouses, and many more.

For more information about our products, check out our website at www.critical-environment.com or to discuss a tailored gas detection solution for your application, contact us at 1-877-940-8741.

 

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Monitoring Ethylene (C2H4) and Carbon Dioxide (CO2) in Ripening Rooms


Fruits and vegetables are commonly shipped for long distances from one country to another before they are ripe so they can endure the voyage and remain viable. Upon arrival at their destination, the first order of business is to get them ripe and ready for sale and consumption.

As fruit and vegetables ripen, they release ethylene, a naturally occurring growth hormone. To be profitable and meet demands, commercial fresh produce companies need to speed up the ripening process in a uniform and predictable way, which is achieved by adding more ethylene in a controlled environment. Typically the fresh produce is placed in air-tight ripening rooms and ethylene is introduced at concentrations between 10 and 1,000 ppm depending on the type of produce.

Ethylene is not harmful to humans in the concentrations used in ripening rooms. An extremely high level of ethylene would have to be inhaled in order to have an adverse effect on human health. That being said, ethylene is a very reactive and flammable gas, making the potential for an explosion a safety concern. The LEL for ethylene is 27,000 ppm (2.7%) and a common concentration used in a ripening room is 1,000 ppm (0.1% by volume), with a typical exposure time of 24 hours.

Two common ways to add ethylene to the ripening rooms is by high pressure gas cylinders or ethylene generators. If ethylene is delivered into the rooms by pipes from cylinders, there are areas for potential leaks and the threat of explosion from cylinders of pure ethylene is high. An ethylene gas detector would be highly recommended to continuously monitor the ethylene gas levels in the cylinder storage room.

In the ripening rooms, the primary reason for an ethylene gas detector is not for the safety of humans, but rather for the safety of the perishable goods. Assisted ripening is a complex process and predictions can be made about the remaining shelf life of the perishable goods based on the level of ethylene gas that is present; that the produce gives off. Some types of fruits and vegetables are more sensitive to ethylene than others. Ethylene sensitive produce will spoil if exposed to levels that make them ripen too quickly. Varieties that are more tolerant but don’t get the right amount will not ripen on schedule.

There is also the potential for ethylene to leak from one room into another, especially if the method of delivery is through a network of pipes. This could cause premature ripening or result in damage to the other types of produce in adjacent rooms. Monitoring the concentration levels of the ethylene gas in each room will help ensure the correct amount is being delivered at all times.

As fruit ripens, it releases carbon dioxide. This decreases the oxygen level in the room and delays the effects of the ethylene. CO2 levels in excess of 1% (10,000 ppm) will slow the ripening process, and can cause quality and production problems. When CO2 levels build up, the ripening room should be vented, which could be as simple as opening the door, or turning on a ventilation system. Constant monitoring of the CO2 levels inside the room with a gas detector that can be configured to activate the ventilation system at a predefined concentration would allow for more efficient control and optimization of the ripening process, a higher safety level and better production.

 

About Critical Environment Technologies Canada Inc.

Critical Environment Technologies Canada Inc. is a leading equipment manufacturer for commercial and industrial gas detection applications. We are dedicated to designing, developing and servicing hazardous gas detection systems for a wide range of applications that require monitoring of refrigerants, TVOCs, combustible and toxic gases. CETCI’s products are sold through a worldwide network of authorized distributors. Our knowledgeable Regional Sales Managers are experienced with many application scenarios, including commercial, institutional, municipal and light industrial markets worldwide. Areas of specialization include car parks, refrigeration plants, commercial swimming pools, water purification, including wastewater treatment facilities, ice arenas, wineries and breweries, schools and many more.

 

For suggestions on gas detection systems, indoor air quality monitors and calibration, please visit

www.critical-environment.com.

 

References

smartGAS Mikrosensorik GmbH. Web. Retrieved from

http://www.smartgas.eu/en/products/applications/foodstorage.html [accessed 30 September 2015]

CHEMAXX INC. “Ethylene Explosion – Banana Ripening.” (2006). Retrieved from

http://www.chemaxx.com/explosion17b.htm [accessed 30 September 2015]

Catalytic Generators LLC “All About Ripening.” (2015). Retrieved from

http://ripening-fruit.com/ingredients_for_proper_ripening [accessed 30 September 2015]

 

 

 

Posted in Applications, EducationalComments Off on Monitoring Ethylene (C2H4) and Carbon Dioxide (CO2) in Ripening Rooms

Ammonia Vent Line Gas Detector


Critical Environment Technologies Canada Inc. (CETCI) is pleased to introduce our Ammonia (NH3) vent line gas detector.

The LPT-A Vent Line Ammonia Transmitter (P/N: LPT-A-VLT-NH3-S) is designed to detect and alert operators of high concentrations of ammonia in vent lines of refrigeration systems caused by equipment failure or system over pressurization. Slow leaks of refrigerant can be costly over time and a dangerous situation could present itself if a high pressure release were to occur. Typically, normal vapour flow is handled by the ammonia compressor, but a vapour flow in excess of the compressor’s capacity will enter the vent stack and can cause a large amount of the gas to travel up the vent line and discharge. In addition, higher than normal concentrations of ammonia can be caused by faulty valves, damaged or worn equipment, contaminants and/or equipment failure or system overpressure. Without safety precautions in place, hazardous levels of ammonia from equipment failure or over pressurization could cause an explosion and seriously jeopardize the health of workers and people in the surrounding area.

The VLT provides continuous, real-time monitoring of the levels of ammonia in the relief vent line. It can be configured to alarm at a pre-determined set point (1.0% / 10,000 ppm is recommended) and send an analog signal to activate a remote strobe or horn, or communicate with a controller or PLC to activate or shut down equipment as required.

The catalytic NH3 sensor has a range of 0 to 3% volume (0 – 30,000 ppm) and is potted into a 2” pipe fitting protruding from the back of the enclosure which connects to a coupler that is used to secure the device to a mounting pipe. The VLT may be mounted on the vent relief stack above the pressure relief valve using the 3/4” cast steel coupler. Or it can be mounted outside on the relief header, 3 to 5 feet above the roof-line. Unless exposed to very high concentrations of ammonia for a prolonged period of time, the sensor should last 3+ years.

The circuitry is housed in a durable, copper coated, ABS/polycarbonate enclosure that is water / dust tight (drip proof) and corrosion resistant. The factory installed splash guard on the (unused) front vent protects the interior from water entering the enclosure. A water tight gland provides a water tight conduit entry for the cable.

The VLT is virtually maintenance free, but removal from the pipe extension will be required to access the sensor during calibration. Bump tests should be done monthly and a full calibration conducted yearly (unless a significant exposure incident occurs, after which additional bump tests and/or calibrations are required to ensure the device is working properly and the sensor has not been poisoned).

Vent line systems should always be treated with extreme caution and workers should assume a relief valve could release at any time. Take necessary safety precautions and follow industry standard practices when installing, servicing and calibrating the VLT.

 

About Critical Environment Technologies Canada Inc.

Critical Environment Technologies designs and manufacturers indoor air quality and fixed gas detection systems including self-contained systems, controllers and transmitters (analog, digital and wireless). Applications include commercial HVAC, institutional, municipal and light industrial markets worldwide. Many of these applications are for vehicle exhaust, but areas of specialization include refrigeration, food processing plants, manufacturing plants, wastewater treatment plants, commercial swimming pools and many more.

For more information about our products, check out our website at www.critical-environment.com or to discuss a tailored gas detection solution for your application, contact us at 1-877-940-8741.

Posted in Products, TransmittersComments Off on Ammonia Vent Line Gas Detector

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Gas Detectors

CETCI gas detectors are used to detect many different gases. Some of the most common are Carbon Monoxide, Carbon Dioxide, Nitrogen Dioxide, Nitric Oxide, Ammonia, Chlorine, Ozone, Combustible Gases like Methane and Propane, Oxygen, Refrigerants and more.

IAQ Monitors

The YES Series of IAQ Monitors are essential for those responsible for conducting Indoor Air Quality (IAQ) Investigations. These instruments are specifically designed to measure and record the quality of indoor air in offices, buildings, homes, schools, parking garages, ice rinks, etc.