Application of CGD-I-1NH3 Ammonia Alarm in Refrigeration System

This article describes the use of ammonia gas leakage alarm devices to centrally control multiple monitoring points in large and medium-sized ammonia refrigeration systems to detect the concentration of ammonia gas leaks in the ammonia plant room. When the concentration of ammonia gas in the environment reaches or exceeds the preset alarm At the time, the ammonia gas leakage alarm device will issue an alarm to remind the user to take safety measures so as to prevent the occurrence of the accident from being reduced so as to avoid the occurrence and harm of the accident.
1. Refrigerants Mentioned in refrigerants, people first think of CFCs, HCFCs, because of their colorless, odorless, non-toxic and safe physical properties, they have long been used as refrigeration systems. The development and application of the company has established an indelible contribution.
This type of renovation project has been confirmed. However, we already know that HCFCs have caused the greatest damage to the ozone layer, and therefore, the well-known Vienna Convention for the Protection of the Ozone Layer and the Montreal Protocol on Substances that Deplete the Ozone Layer, and the Montreal Protocol (Amendment). My country joined the Vienna Convention in September 1989. Since the substance that destroys the ozone layer occupies a very important position in industrial and agricultural production, it is necessary to research and develop appropriate substitutes for limiting and disabling the aforementioned substances. Since the substance that destroys the ozone layer is mainly Freon, the search for alternatives to Freon is the focus of research. Now more commonly used are: hydrofluorocarbons HFC, hydrofluorocarbons do not contain chlorine, does not damage the ozone layer, the degradation products in the atmosphere is less toxic, is an ideal alternative. However, the greenhouse effect is heavier, and the production cost is high. The heat exchange performance is poor and the flammability is a shortcoming. In particular, large-scale refrigeration systems are difficult to perform. Therefore, ammonia as a refrigerant can better solve the above problems.
Ammonia (R717, NH) is one of the medium-temperature refrigerants. Its evaporation temperature, ts, is -33.4°C and its application range is +5°C to -70°C. When the cooling water temperature reaches 30°C, the working pressure in the condenser is generally Not more than 1.5MPa. The vapor of ammonia (R717, NH) is colorless and has a strong irritating odor. Ammonia (R717, NH) is highly toxic to the human body and causes frostbite when ammonia splashes on the skin. When the volume of ammonia vapor in the air reaches 0.5-0.6%, it can cause an explosion. Therefore, the concentration of ammonia in the air in the engine room must not exceed 0.02 mg/L.
2. National regulations require that the flammable and explosive nature of ammonia be met by relevant national regulations. For example, in Article 2.2.2 of the “Specifications for Design of Electrical Installations for Explosion and Fire Hazardous Environment” (GB50058-92), flammable substances may appear. When the highest concentration does not exceed 10% of the lower explosive limit, it can be classified as a non-explosive danger zone. Another example is Article 7.2.1 of the “Freezer Design Code” (GB50072-2001). The ammonia compressor room should be equipped with an automatic measurement device for ammonia concentration. When the ammonia concentration is close to 10% of the lower explosion limit, an alarm signal should be issued. Ammonia Explosion Hazard: When the volume of ammonia in the air reaches a concentration of 15% to 28% (105 g/m to 200 g/m3), an open flame can cause an explosion. Based on this, the ammonia concentration alarm value is a value close to 1.5% (10.5 g/m3).
When the concentration reaches 0.266%, which is equivalent to only 2% of the lower explosion limit, it can already cause death. Therefore, if the alarm value of ammonia concentration is set to be close to 10% of the lower explosion limit, there is no real improvement in the level of safe production. How much practical significance. Combining the current status of ammonia leakage in ammonia refrigeration rooms in various industries in China, and referring to the same industry standards (50ppm) in developed countries and regions such as Hong Kong and the United States, ammonia concentration automatic measurement devices are installed in the ammonia refrigeration room, and the alarm concentration value should be set at 150 It is ~200 ppm, which is approximately 0.8‰ to 1.4‰ near its lower explosion limit.
3. Automatic detection of ammonia concentration In a complete ammonia refrigeration system, most of the ammonia refrigerant is in the refrigerator room, and the operation and operation of each refrigeration equipment is also completed in the refrigerator room. The equipment operation control display is also in the refrigerator room. Therefore, it is necessary to install an ammonia leakage control device in the refrigerating machine room.
In practical engineering applications, in addition to installing explosion-proof accident fans in the equipment room, CGD-I-1NH3 ammonia leakage alarms are also installed in the refrigerating machine room. We will refer to the probes for short, because the size of the refrigerating machine rooms is different, the probes can hold two , 4, 6, and so on, are distributed around the room, which facilitates the timely detection of leaks, and is equipped with a smart alarm controller to form a complete ammonia leak control and alarm device. The specific control flow is as follows: When the ammonia in the refrigeration room leaks, and the operator fails to open the explosion-proof accidental exhaust fan for various reasons, or the operator cannot enter the machine room to operate, the probe installed in the machine room detects the ammonia concentration alarm value. When outputting a 4~20mA current signal to the intelligent alarm controller, the intelligent alarm controller will output the switch signal after receiving the alarm signal, and use the lower limit alarm signal of the ammonia concentration automatic measurement device to forcibly start the operation of the explosion-proof accidental exhaust fan; The upper limit alarm signal is used to cut off all equipment power except the explosion-proof accident exhaust fan and explosion-proof lighting in the engine room to form a complete safety control system.
4. CGD-I-1NH3 ammonia leakage alarm adopts imported electrochemical sensors, short reaction time, long service life; explosion-proof enclosure, strong and durable; high reliability and accuracy, anti-interference ability; good performance to price ratio . Analog output type and field display type, the former can output current signal, the latter can not only output the current signal but also display the gas concentration value on the spot. It is more intuitive and can be selected according to the user's needs in actual engineering. Under normal circumstances, if the user configures There is a host computer system, suitable for analog output type, if the user does not have a host computer system, it is suitable to use the field display type.
CGD-I-1NH3 ammonia leak alarm

First, the product description Fixed, liquid crystal display ammonia leak alarm. The default signal is 4-20mA current output RS485 optional. Products using the most advanced microelectronics processing technology, with imported foreign gas sensors, can quickly and accurately detect the target gas. Intrinsically safe circuit design, with a die-cast aluminum explosion-proof enclosure, can be safely used even in harsh environments. The CGD-I-1NH3 ammonia leak alarm is a gas diffusion type. The detection principle is that when the target gas enters the gas probe section, the internal sensor will sense the first time. Sensors generate a certain amount of electrical signal based on the gas concentration. After the signal is amplified by the circuit, the CPU passes AD sampling, temperature compensation, and intelligent calculation to output a precise 4-20mA current signal and RS485 communication signal. The customer can collect these signals and use it with the JH-XSD, JH-99 gas alarm control host, PLC, DCS, and host computer systems of Hengan Environmental Protection to perform alarm and data reprocessing. In addition, the product is equipped with 2 groups of relays (switch signal), which can be linked with the control equipment of the fan and solenoid valve to ensure the safety of your life and property.
Second, CGD-I-1NH3 ammonia leakage alarm product features ● CGD-I-1NH3 ammonia leakage alarm measurement accuracy, reliability Sensors imported high-quality catalytic combustion sensors, electrochemical sensors, infrared sensors, PID sensors with high accuracy, Fast response and stable performance ● CGD-I-1NH3 ammonia leakage alarm equipped with intrinsically safe explosion-proof sound and light alarm, ≥ 85dB sound and flash light tips ● First and second fault alarm and relay output ● Clear display , intuitive use of LCD large LCD screen, gas concentration digital display
● Password protection for maintenance safety ● The CGD-I-1NH3 ammonia leak alarm adopts three-wire 4-20mA industrial standard current signal output to connect with various gas alarm controllers, or PLC, DCS and other systems. (RS485 optional)
● Infrared remote control operation adjustment parameters need to be changed, simple, fast and full-featured on-site operation without cover open non-intrusive.
● CGD-I-1NH3 ammonia leakage alarm is operated by remote control to facilitate the adjustment of the instrument in the field. ● Strong, durable die-cast aluminum and 304 stainless steel components, corrosion resistance ● Explosion-proof certificate level: ExdIICT6
● Explosion-proof license number: CE11.1153
● Protection class: IP66
Third, CGD-I-1NH3 ammonia leakage alarm product parameter detection gas ammonia chemical NH3 detection principle electrochemical range 0-100ppm 200ppm 1000M optional (more range please consult) resolution 0.1, 1PPM optional (according to the range and Sensors depending on the detection method Diffusion type mounting method Wall mounted (closest to the gas leakage source) Output signal 4-20mA (RS485 optional) Design standard GB 50493-2009 "Petroleum chemical companies combustible gas and toxic gas detection alarm Design Code
GB 12358-2006 "General Technical Requirements for Environmental Gas Detectors and Alarms in Workplaces" Level Industrial Display LCD Display Operating Voltage DC 12-24V Housing Materials Die-casting Aluminum and 304 Stainless Steel Accuracy ≤ ± 5% Acoustical and Optical Alarm Explosion-Proof Warning Lights ≥ 85dB ( Optional) Response time ≤ 60S (T90) Relay 2 group (standard) Repeatability ≤ ± 2% Explosion-proof grade ExdIICT6 Linearity error ≤ ± 0.2% Explosion-proof license CE11.1153 Zero drift ≤ ± 0.5% (FS/month) Protection Class IP66 Operating temperature -20°C～+60°C (please inquire for special requirements) Measurement certificate Optional working humidity ≤95% RH No dew-wire system 2-wire or 3-wire system (split type) Working pressure 86～106Kpa Fixed position 4 power consumption ≤ 2W (DC 24V) Inlet M20*1.5 Size 195mm x 155mm x 90mm Outlet M20*1.5 Coverage radius ≤ 7.5m Design life 2 to 3 years (depending on sensor) Weight approx. 1.98KG Accessory packaging Box, manual, certificate, calibration cover, weatherproof cover
Applications: Oil and petrochemical, chemical plants, smelters, steel plants, coal plants, thermal power plants, pharmaceutical scientific research, pharmaceutical production plants, tobacco companies, environmental monitoring, school research, building construction, fire alarm, sewage treatment, industrial gas process control , Boiler room, waste treatment plant, tunnel construction, oil pipeline, gas station, underground gas pipeline overhaul, indoor air quality testing, and safety protection monitoring of dangerous places.

V. Ordering instructions Type CGD-I-1 Display CGD-IB JH-B Explosion-protected CGD-I-1 CGD-IK Detection of common flammable gases and various toxic gases Detection principle Catalytic combustion, semiconductor, electrochemical, infrared, PID photoelectric ion , Heat transfer type display liquid crystal display digital display digital display no significant output signal 4-20mA RS485 relay relay 4-20mA relay wire system 3-wire / 4-wire 220V AC 220V AC 2-wire / 3-wire 2-wire

5. JH-XSD series gas alarm controller receives four standard signals: 4-20mA alarm point and all parameters can be set by key, with four alarm control relay output can provide 24V power for four detection probes. Three-wire or three-wire probe All, optional RS485/RS232 communication interface. There are usually single-channel, 2-channel, 4-channel, 8-channel, and 16-channel. Each channel is connected to a toxic gas detection transmitter. The specific selection of several channels is determined by the number of toxic gas detection transmitters in the equipment room.

12V Dc Motor Can drive under the rated voltage 12 v dc motor, most of the products our company can achieve the 12 v voltage drive, speed can be customized according to customer demand.

Characteristics: 12V dc motor With torque, low noise, small size, light weight, easy to use, constant speed operation, etc, also can match all kinds of reducer in order to achieve the purpose of changing the output speed and torque

Application field:  12V Dc Motor part of the armature iron core, armature, commutator and other devices, dc motor is suitable for most of the electronic products, such as electric toothbrush, razor, medical apparatus and instruments, breeze machine, mixer, etc

          

Method of use: the best stable in horizontal plane, installed on the 12V Dc Motor output shaft parts, cannot use a hammer to knock, knock prone to press into the 12V dc motor drive, may cause damage to internal components, and cannot be used in the case of blocked.

 

Operating temperature range:

12V dc motor  should be used at a temperature of -10~60℃.

The figures stated in the catalog specifications are based on use at  ordinary room temperature catalog specifications re based on use at ordinary room temperature  (approximately20~25℃.

If a 12V dc motor  is used outside the prescribed temperature range,the grease on the gearhead area will become unable to function normally and the motor will become unable to start.Depending on the temperature conditions ,it may be possible to deal with them by changing the grease of the motor's parts.Please feel free to consult with us about this.

   

Storage temperature range:

12V dc motor  should be stored ta a temperature of -15~65℃.

In case of storage outside this range,the grease on the gearhead area will become unable to function normally and the motor will become unable to start.

 

Service life:

The longevity of geared motors is greatly affected by the load conditions , the mode of operation,the environment of use ,etc.Therefore,it is necessary to check the conditions under which the product will actually be used .The following conditions will have a negative effect on longevity.Please consult with us should any of them apply.

●Use with a load that exceeds the rated torque

●Frequent starting

●Momentary reversals of turning direction

●Impact loads

●Long-term continuous operation

●Forced turning using the output shaft

●Use in which the permitted overhang load or the permitted thrust load is exceeded

●A pulse drive ,e.g.,a short break,counter electromotive force,PWM control

●Use of a voltage that is nonstandard as regards the rated voltage

●Use outside the prescribed temperature or relative-humidity range,or in a special environment.

●Please consult with us about these or any other conditions of use that may apply,so that we can be sure that you select the most appropriate model.

 

when it come to volume production,we're a major player as well .each month,we rurn out  600000 units,all of which are compliant with the rohs directive.Have any questions or special needed, please contact us, we have the engineer group and best sales department to service to you Looking forward to your inquiry. Welcome to our factory.

 

 

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