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Performance indicators are important safety devices that must be monitored regularly and are necessary for every chemical fume hood. Each hood should be equipped with a monitoring device used to continuously measure air flow, and provide a visible reading to the hood user.
The most common types of visual performance indicators are differential pressure manometers or gauges, and digital monitoring devices. It is important to the health and safety of the laboratory occupants to pay close attention to the digital or posted reading.
A broken or missing performance indicator may result in lab occupants being unaware of air flow changes, and increase the risk of chemical exposure. If you believe that your hood is missing a performance indicator, your current device has been damaged, or is out of range; please contact Facility Operations immediately for repair.
| Model Specification | WJ-1500A | WJ-1500B | WJ-1800A | WJ-1800B |
| External dimensions of equipment(mm) | 1500(W)*1205 (D) *2400 (H) | 1800(W)*1205 (D) *2400 (H) | ||
| Dimension of works pace (mm) | 1260(W1)*780(D1) *1100 (H1) | 1560(W1)*780(D1) *1100 (H1) | ||
| Panel material | 20+6mm thick butterfly ceramics | |||
| Material of internal lining board | 5mm thick ceramic fiber board | |||
| Diversion structure | Lower air return | |||
| Control system | Button control panel (LCD panel) | |||
| PH value control | The medium is alkaline water solution; manual monitoring, and manual control through acid pump and alkali pump. | |||
| Input power | Three-phase five-wire 380V/50A | |||
| Current for air fan | Not over 2.8A(380V or 220V can be directly connected) | |||
| Maximum load of socket | 12 KW(total of 4 sockets) | |||
| Water tap | 1 set (remote control valve + water nozzle) | No | 1 set (remote control valve + water nozzle) | No |
| Water discharge way | Magnetic chemical pump strong discharge | |||
| Using environment | For non-explosion indoor use, within 0-40 degrees Celsius. | |||
| Applicable fields | Inorganic chemistry experiment; Food, medicine, electronics, environment, metallurgy, mining, etc. | |||
| Ways of Purification | Spray sodium hydroxide solution, no less than 8 cubic meters/hour | Spray sodium hydroxide solution.no less than 12 cubic meters/ hour | ||
| Ways of surface air speed control | Manual control (through the electric air valve to adjust the exhaust air volume or adjust the height of the moving door) | |||
| Average surface air speed | 0.6-0.8 m/s Exhaust air volume: 1420-1890m3/h (when door height h =500mm) | 0.6-0.8 m/s Exhaust air volume: 1760-2340m3/h (when door height h =500mm) | ||
| Speed deviation of surface air | Not higher than 10% | |||
| The average intensity of illumination | Not less than 700 Lux; Standard white and uv-free yellow LED lamps; The illumination is adjustable. | |||
| Noise | Within 55 decibels | |||
| Flow display | White smoke can pass through the exhaust outlet, no overflow. | |||
| Safety inspection | No spikes, edges; Charged body and the exposed metal resistance is greater than 2 mQ; Under 1500V voltage, no breakdown or flashover occurred for 1min test. | |||
| Resistance of exhaust cabinet | Less than 160 pa | |||
| Power consumption | Less than 1.0kw/h (excluding power consumption of fans and external instruments) | Less than 1.2kw/h (excluding power consumption of fans and external instruments) | ||
| Water consumption | Less than 3.2L/ h | Less than 4.0L/ h | ||
| Performance of wind compensation | With a unique wind compensation structure, the volume of the wind will not cause turbulence in exhaust cabinet and will not directly blow to the staff (need to connect to the air compensation system of the laboratory) | |||
| Air volume regulating valve | 315mm diameter flanged type anti-corrosion electric air flow regulating valve (electric contact actuator) | |||
Baffles
The baffles are moveable partitions used to create slotted openings along the back of the hood body. Baffles keep the airflow uniform across the sash opening to optimize capture efficiency and eliminate dead spots or possible reverse flows at the sash opening which would result in a loss of containment.
Baffle Positions
Adjusting the baffles allows the user to accommodate light vapors or dense, heavy vapors as necessary. High performance fume hoods have louvered or articulated baffles that allow more flexibility. Baffle positions open and close the slots between the panels. In a three panel louvered baffle system, the baffles would be adjusted as follows to accommodate light or dense vapors:
• Light vapors: Maximum airflow is required at the top. Top slot is fully opened and the center and bottom slots are in the open position.
• Normal Operation: The top, center, and bottom slots are all open evenly to
provide uniform flow.
• Heavy vapors: Maximum flow is required at the bottom near the work surface. The top slot is closed and the center and bottom slots are open.
Sash
The sash located at the front of the hood can be adjusted to optimize the air flow into the fume hood. It provides a protective barrier, a window to observe the activities in the containment, and protects the user's breathing zone from vapors released in the containment.
Sash Opening
The sash opening or hood face is the imaginary plane from the bottom of the sash to the air foil sill. The face velocity is measured across this plane.
Sash Positions
There are three typical sash positions to be used by the operator.
• Closed: All sashes should be closed when the fume hood is not in use.
• Operating Position or Operating Height: A maximum of 18 inches. The sash should be used at this position whenever work is being performed in the containment.
• Set-Up Position: Any opening greater than the operating position. The sash should only be used in this position for loading equipment and set-up of materials. Other work should not be performed with the sash in the set-up position.
• Hoods should be evaluated by the user before each use to ensure adequate face velocities and the absence of excessive turbulence.
• In case of exhaust system failure while using a hood, shut off all services and accessories and lower the sash completely. Leave the area immediately.6 Questions to Ask When Buying a Fume Hood:
-Which chemicals will you use within the hood?
-Is a ducted or ductless hood best suited to your needs and available space?
-Where will you place the fume hood in the lab? Consider workflows, access to external exhaust systems, and competing air patterns.
-What size fume hood will best suit your needs? Be sure to consider what (if any) equipment will be enclosed in the hood.
-Are any service fixtures or accessories such as airflow monitors, electrical outlets, water, or gas fixtures required?
-Are base cabinets for acid, solvent, or non-chemical storage required?
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