Tag Archive | "Gas Detectors"

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.

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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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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

Monitoring Ozone (in the air) in Hatchery & Fish Farm Applications


Critical Environment Technologies Canada Inc, (CETCI) offers strategic and reliable gas detection solutions for many applications, including ozone gas detection in the aquaculture industry.

Hatcheries, fish farms and such in the aquaculture industry require clean water to maintain a high survival rate while rearing aquatic animals. Contaminated water increases the risk of infection which in turn can compromise production. A common way to disinfect water is by generating ozone on-site with an ozone generator. Ozone is a powerful bactericide and viricide that decreases the risk of infection from water borne diseases which helps maintain a high survival rate, aerates the water and leaves no undesirable residues. However, ozone is highly toxic to humans and aquatic animals at very low levels. Standards set by OSHA allow a permissible exposure level of less than 0.1 mg/L on a time-weighted average for an 8 hour work period and a maximum single exposure level of 0.3 mg/L for less than a 10 minute duration.

For human safety, the ozone concentrations in the air should be monitored in the locations that could become contaminated with ozone. A typical ozone system for a hatchery operation has an ozone generator and three chambers. The ozone generator creates ozone which is then introduced into the first tank, the counter flow diffusion chamber. Here the oxidization of dissolved matter occurs. The first ozone gas detector should be installed in the ozone generator room to monitor for potential leaks around the ozone generator and piping structures. If the gas detector were to go into alarm, it can be configured to shut off the ozone generator, stopping the production of ozone. In addition, the ventilation and make-up air fans can be triggered to come on and go off at set intervals, including when the gas detector goes into alarm. The second chamber is the reaction or contact tank where the disinfection of the water and slow chemical reactions occur. Depending on the operation setup, the second chamber may be in the ozone generator room or in another room or general area. From the contact tank, the water gets sent to the third chamber which completes the slow reactions and the majority of the residual ozone decomposes. Any undissolved or residual ozone gas is collected and vented by way of the ozone destruction process which will destroy the ozone in the gas before releasing it into the atmosphere. A second ozone gas detector should be installed near the ozone destructor to monitor the exhaust air stream to ensure the ozone destructor is operating effectively.

CETCI’s LPT-A-O3 Ozone Gas Detector offers a fixed, continuous gas monitoring solution for hatcheries, fish farms and other aquaculture operations that use ozone to clean the water. Use as a standalone system, or combine up to four ozone gas detectors with our QCC Quad Channel Controller for larger applications. Each LPT-A-O3 transmitter features an audible alarm, LCD display with real time gas readings and a programmable relay to shut down the ozone generator. When combined with a QCC Controller, three more relays are available for triggering safety events such as switching on/off ventilation fans or make-up air fans and/or activating a remote strobe/horn. More value-added features available are two analog outputs, a data logger, manual equipment ON/OFF switch, top mounted strobe, remote strobe and horn combo and remote display module that offers the ability to view the gas level readings in a separate location from the controller and transmitters.

Ozone is a very reactive gas and can quickly corrode metals and damage plastic materials. There should be regular maintenance checks of pipe fittings, gaskets and seals all along the ozone injection system. In addition to a fixed gas detection system, it is also recommended that portable handheld monitors be used to do spot checks for leaks around piping and in poorly ventilated areas. If there is an equipment malfunction, or if tubing’s and fittings leak, or too much ozone is being produced, a properly installed ozone gas detector system will alarm and shut down the ozone generator before a dangerous environment is created and the health and safety of the workers is jeopardized.

 

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.

 

References

Eugster, Ulrich and Bruce Stanley “The Use of Ozone as a Disinfectant in Fish Hatcheries and Fish Farms.” Web.
   http://www.ozomax.com/pdf/article-seafood-hatchery.pdf [accessed 2 October 2015]
Gearheart, Michael and Steven Summerfelt “Ozone Safety in Aquaculture Systems.” Hatchery International (July/August 2007). Web.
  http://www.ozonesolutions.com/files/research/aquaculture_safety.pdf [accessed 2 October 2015]
Summerfelt, Steven T and John N. Hochheimer “Review of Ozone Processes and Applications As an Oxidizing Agent in Aquaculture.” The
  Progressive Fish-Culturist (1997) 59:94-105. Web. http://www.w-m-t.com/library/pdf/Summerfelt_paper_Review_of_Ozone.pdf [accessed 2
  October 2015]
WorkSafe BC “Ozone Safe Work Practices.” (2006) Web.
  http://www.worksafebc.com/publications/health_and_safety/by_topic/assets/pdf/ozone_bk47.pdf [accessed 2 October 2015]

 

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Four Channel Gas Detector for Wastewater Treatment Plants


Critical Environment Technologies Canada Inc, (CETCI) offers strategic and reliable gas detection solutions for many applications, including wastewater treatment plants. Our QCC Quad Channel Controller, is an ideal fixed gas detection system for this type of application.

A wastewater treatment facility is a wet maze of rooms, pipes, pumps, wells, chambers, concrete tanks and settling basins. Each treatment stage the wastewater goes through involves hazardous gases that may be already present, are produced or are added to complete the process. To ensure the safety of the workers, equipment and the facility, every area presenting a gas hazard should be monitored, including the gas storage rooms, ozone generator room and any room that gas passes through. In the larger, open areas, a fixed gas detection system is suitable; in confined spaces that operators enter and where gas may be present, portable gas detectors are more appropriate.

The most common hazardous gases found in this type of facility are hydrogen sulphide, methane, ammonia, carbon monoxide, chlorine and oxygen deficiency. Some facilities may also use ozone, chlorine dioxide or sodium hypochlorite with the chlorine during the sanitization treatment process. Furthermore, sulphur dioxide is often used to de-chlorinate the water once the treatment process is complete.

CETCI’s QCC Quad Channel Controller offers a fixed, continuous gas monitoring solution with four gas channels, three programmable relays, a door mounted audible alarm and an optional BACnet RS-485 output signal for communicating with a building automation system. The four gas channels can be configured with any combination of analog or digital transmitters with the same or different types of gas sensors. For large applications, multiple QCC controllers can be networked together, each providing another four available gas channels and 3 relays. Other value added, optional features include 2 analog outputs with a data logger, manual equipment ON/OFF switch, top mounted strobe, remote strobe and horn combo and a remote display module that offers the ability to view the gas level readings in a separate location from the controller and transmitters.

The potential for physical damage to the gas detection equipment is high in this type of harsh, wet environment. CETCI’s equipment is constructed to withstand the unpredictable water levels and acidic or caustic conditions from gases like hydrogen sulphide and chlorine when it mixes with water.

 

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 Applications, Controllers, News, ProductsComments Off on Four Channel Gas Detector for Wastewater Treatment Plants

Multiple Gas Detectors – Should They all be Calibrated at the Same Time?


Depending on the number and placement of gas detectors in your facility, you might be looking at the task of calibrating them as never-ending. It is true, calibration can be time consuming, especially if it is a large area populated with multiple fixed location sensors with different gas types – some near the ceiling, others near the floor and still others somewhere in between. However, it is a task the needs to be done and dedicating the time to calibrating them all at once is the optimal and responsible course of action. Having some sensors calibrated and others not on a job site leaves room for inaccuracies and poses a potential danger to workers and the public.

How long it takes to calibrate all the sensors will depend on the experience and training level of the person doing the calibration, what type of equipment is used and the number of sensors in the facility. Trained technicians can calibrate up to two different types of gas sensors at one time, which saves labour time. Taking on that challenge is not recommended unless the technician has the equipment, training and experience. Calibrating one sensor at a time may take a little longer, but can be easier for the inexperienced service technician and the end result is still a correctly functioning gas detection system.

Monthly bump testing of sensors is recommended in particular for sensors that are monitoring for gases that pose a serious health and safety risk when they leak, such as Ammonia, Chlorine, and Ozone. A log book must be kept to detail date, time and confirm bump testing results. It benefits the user to bump test all gas sensors in their facility. When bump testing Ammonia, in particular, use only a concentration of span gas just higher than the low alarm set point. Ammonia sensors are consumable and their life span is often measured in “ppm hours”. Using a high concentration of NH3 span gas to bump test will shorten the life of an Ammonia sensor.

How do you know if you are getting a correct reading from the unit?

The only way to guarantee that an instrument will detect gas accurately and reliably is to test it with a known concentration of gas. Exposing the instrument to a known concentration of test gas will show whether the sensors respond accurately and whether the instrument alarms function correctly. Keeping a log and verifying the accuracy of readings on a daily basis for a trial period will reinforce your confidence that the unit is performing correctly.

 

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

www.critical-environment.com.

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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.