Introduction to formaldehyde detector selection：
Aetna Gihua recommends the following products for you:
The fixed formaldehyde detector is mainly composed of an alarm control host and a formaldehyde gas detection probe. The alarm control host has a switching output and optional communication interface, which can be connected to an external sound and light alarm or start the control device. It is also possible to communicate with the host computer.
The alarm control host can receive the signal of the detection probe, and when the measured value reaches the set alarm value, the control host will send out an audible and visual alarm, and at the same time output the control signal (switching contact output), prompting the operator to take safety measures in time, or automatically start the pre-connected control equipment to ensure safe production. Antai Jihua series alarm host is suitable for all kinds of industrial alarm control, wall-mounted installation, simple installation, easy operation, stable working state, and high measurement accuracy.
1, alarm control host functions and parameters
Receiving standard signals: 4-20mA, 2-wire or 3-wire probes are acceptable, and 24V power supply can be provided for the probe.
Optional 1, 2, 4, 8 channel number of four main units: each channel is connected to a probe, and the number of channels is stated when ordering;
Alarm points and all parameters can be set by button;
Each channel has two alarm outputs; Switching Passive Contact Output 220VAC, 2A
It can set low and high limit secondary alarms, or upper and lower limit alarms, with delay alarm function (some models);
The host can correct the data of the detection probe and remotely adjust the zero point;
Optional RS485/232 communication function for real-time monitoring and communication.
Operating voltage 220V AC
Temperature range: 0~70°C
Humidity range: 10~90% RH (non-condensing)
Accuracy: 0.2%F.s (0.5%F.s for a single channel)
Installation method: wall mounting
Weight: Approx. 1.2 kg (single/dual channel)
Overall dimensions: 200X200X80mm
2, formaldehyde gas probe functional parameters
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How it works:
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electrochemical
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Detect gases
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Formaldehyde gas
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Detection range
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0-20ppm
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Maximum power consumption
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30mA
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Output signal
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4-20mA standard signal output
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Connect the cable
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2-core shielded cable
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Accuracy
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±5%
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Zero drift
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< 0.5% F.S./month
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Reaction time
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<30s
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Explosion protection
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Ex d IIC T6
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Ingress protection
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IP66
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Power supply
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24V DC can be supplied by the main unit
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Sensor life
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2 years
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Rules
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Housing diameter 105mm
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weight
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950g
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Origin
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Beijing
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Model number
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JHAT-FM-HCHO
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1. Installation method: wall-mounted or tube-mounted; The distance between the transmitter and the release source should not be greater than 2 meters outdoors and 1 meter indoors.
2. If there are many release sources or large areas (more than 8 points) that need to be detected, please select; Antai Jihua bus makes formaldehyde detection probe/transmitter.
3. The advantages of JHAT-FM-HCHO (detection probe/transmitter) + AT-1/2/4/8 (alarm control host) and JHAT-FZ-HCHO (detection probe/transmitter) are; Save wiring costs and facilitate unified control.
Attached:
Formaldehyde is a colorless gas with a strong pungent odor. It is easily soluble in water, alcohols and ethers. Formaldehyde is gaseous at room temperature and usually appears in aqueous solution. Its 37% aqueous solution is called formalin, which is used by medical and scientific research departments to preserve specimens. The boiling point of this solution is 19.5°C, so it is very volatile at room temperature, and the volatilization rate accelerates with the increase of temperature. Formaldehyde ranks second in China's priority control list of toxic chemicals. Formaldehyde has been identified by the World Health Organization as a carcinogenic and teratogenic substance.
Formaldehyde was widely used in industrial production 100 years ago due to its strong chemical response and low price.
Formaldehyde is a very strong fungicide, which is widely used in hospitals and scientific research departments for the preservation of specimens.
Some inferior water-based interior wall coatings and white latex also use formaldehyde as preservatives;
Some unscrupulous businessmen also use it to preserve food (such as seafood, rice noodles, etc.).
Formaldehyde is widely used in industrial production, is the raw material for the manufacture of synthetic resins, paints, plastics and man-made fibers, and is an important raw material for adhesives used in the manufacturing of wood-based panels (urea-formaldehyde resin glue, melamine resin glue and phenolic resin glue). At present, urea-formaldehyde resin adhesive (UF) is mainly used in the production of wood-based panels (including plywood, large core board, MDF and particleboard) in various countries around the world.
