1、 Product Overview:
The ammonia flowmeter adopts the principle of Karman vortex flowmeter, which has high reliability and can measure the temperature range of medium from -20 ℃ to+250 ℃. The ammonia flowmeter has standard signal output and pulse signal output, which can be used in conjunction with computer systems and is an ideal measuring instrument for automation.
Ammonia is an inorganic compound with a colorless and pungent odor that is easily soluble in water. When ammonia dissolves in water, it becomes a gas at room temperature, making ammonia metering extremely simple. When ammonia passes through high pressure or low temperature, it will become liquid. At this time, a flow meter with a single function cannot measure the flow rate. It is necessary to contact Ouwei Instrument to provide a selection plan.
2、 Parameters and requirements of ammonia flowmeter:
Measurement medium: gas, liquid
Installation methods: flange card type, flange type, plug-in type
Flow range: Reynolds number 1.5 × 104~4 × 106; Gas velocity of 5-50m/s; Liquid 0.5-7m/s
Measurement accuracy: Level 1.0, Level 1.5
Measurement temperature: normal temperature -25 ℃~100 ℃, high temperature -25 ℃~150 ℃ -25 ℃~250 ℃
Signal output: Pulse voltage output, high level 8-10V, low level 0.7-1.3V, pulse ratio of about 50%, transmission distance of 100m, pulse current remote transmission output 4-20mA, transmission distance of 1000m
Environmental temperature: -25 ℃~+55 ℃ Humidity: 5-90% RH50 ℃
Shell material: stainless steel, aluminum alloy
Power supply: DC24V or lithium battery 3.6V
Explosion proof grade: intrinsic safety type iaIIbT3-T6
3、 Characteristics of ammonia flowmeter:
1. The table body has temperature and pressure compensation function, which can measure the standard volume flow rate or standard mass flow rate of the fluid.
2. Fully intelligent and digital circuit design, capable of automatically compensating for measured fluid density or standard condition volume calculation.
3. The new digital filtering and correction functions make flow measurement more accurate and reliable.
4. The battery powered type can work continuously for more than two years without the need for an external power source.
5. The brand new dot matrix Chinese character LCD display is more convenient to use and operate.
4、 Having the installation conditions for ammonia flowmeter:
⑴ Pipeline situation: Installation requires a certain amount of front and rear straight pipe sections. Common situations are shown in the figure (D is the diameter of the pipeline):

⑵ Installation conditions:
1. The sensor should be installed on a horizontal, vertical, and inclined (liquid flow from bottom to top) pipeline with the same diameter as it. The upstream and downstream of the sensor should be equipped with a certain length of straight pipe section, which should meet the requirements of 15-20D for the front straight pipe section and 5-1OD for the rear straight pipe section.
2. The pipeline near the installation of the liquid sensor should be filled with the measured liquid.
3. Sensors should be avoided from being installed on pipelines with strong mechanical vibrations.
4. The inner diameter of the straight pipe section should be as consistent as possible with the sensor diameter. If it cannot be consistent, a pipe slightly larger than the sensor diameter should be used, with an error of ≤ 3% and not exceeding 5mm.
When the measured medium contains a large amount of impurities, a filter should be installed beyond the required length of the straight pipe section upstream of the sensor. Sensors should be avoided from being installed in places with strong electromagnetic field interference, small space, and inconvenient maintenance.