Test on refrigerators appliances and circuits
Microline was present at A&T 2012 in Turin
Microline at China Import and Export Fair in April 2012
Microline is COGNEX certificated integrator
Leak and Flow Tests
MICROLINE MPLEAK - MPFLOW - LF - HL100 is automatic testing equipment that uses air, gas or gas mixes to check the input and tightness of gas or hydraulic circuits.
PORTABLE TEST RIG: MICROLINE MPLEAK MPFLOW
MPLEAK test rig is designed to check tightness of gas circuits and pressure vessels, using air.
The standards require that the tightness test is carried out at 150 mbar (for gas circuits) and up to 12 bar (for hydraulic circuits). Pressures different from these must be specified and agreed.
The MICROLINE MPFLOW version is used to measure air flow in pneumatic circuits.The test is made by measuring the drop in pressure through three gauged flanges by the same number of measuring scales.
MICROLINE MPFLOW can also be used to measure air flow on refrigerator capillaries.
In this case measurements are taken with a mass flow transductor.
A rapid connection to the capillaries is placed directly on the front of the equipment.
The test equipment is used to rapidly detect capillaries that have internal obstructions, even only partial.
FIXED TEST RIG: MICROLINE LF SERIES AND HL100
The series LF test equipment is designed to test: cookers, gas cooking hobs and combustion chambers on hermetic boilers.
With regard to testing gas cookers and cooking hobs, the test rig is made to test: air tightness, air and/or gas flow and other functional details such as safety thermocouple cut-in.
With regard to testing combustion chambers on hermetic boilers, the test rig is designed to test tightness with high flow (up to 1500 nl/h) and values of very low pressure (0.5 to 5 mbar).
In both cases supply pressure regulation is automatic and flow is measured with a mass sensor.
As the equipment is modular, the tests can be modified and/or integrated with those for electrical safety (earth efficiency, insulation resistance, dielectric strength, residual voltage, eddy currents).
HL100 is test equipment dedicated to checking tightness in gas circuits or hydraulic circuits for heat exchangers. 
It uses a mix of tracer gas: hydrogen and nitrogen, which is non-inflammable and environmentally friendly.
Standard technical specifications:
- automated Custom connections for quick connection to the items being tested;
- possibility to pre-check tightness in a vacuum or under air pressure, to seek out serious leaks;
- end of test automatic washing cycle for the item being tested, to avoid contamination which could affect measurement.
| Air leak | ||||
|---|---|---|---|---|
| input pressure | 6 bar | 6 bar | 18 bar | 6 bar |
| test pressure | 100-250 mbar | 5 bar | 15 bar | 0.5-5 mbar |
| measuring range | da 20 a 150 cc/h | da 0.1 a 10 mbar | da 0.1 a 10 mbar | 100-1500 l/h |
| resolution | 1 cc/h | 0.01 mbar | 0.01 mbar | 2 l/h |
| Flow | ||
|---|---|---|
| input pressure | 6 bar | <50 mbar, 100-200 mbar, other on request |
| full scale | 500-1000-2000 l/h | 1-20 m3 |
| output pressure | stabilized | stabilized or automatically regulated |
| measuring range | 4 autorange values | on request |
| Leakage with tracer gas mixture | ||
|---|---|---|
| input pressure | 6 bar | 200 bar, cylinder |
| test pressure | 100-200 mbar | 1-15 bar |
| minimum detectable leak |
2 cc/h | 2 cc/h |
CN2 and CN2-D are test rigs capable of carrying out flow cycles and loading of nitrogen or other non-corrosive mixes, on heat exchangers or any pressure vessels.
CN2 is semi-automatic test equipment that can be programmed to create a single loading cycle at programmable pressure, with manual flow activated by means of a push button.
CN2-D goes one step further; it is automatic test equipment with programming potential to create complete flow and loading cycles. It is provided with a buzzer to signal end of flow to the operator, who simply pushes the start button in order to continue. As an alternative, separate cycles can be carried out by selecting them with the keyboard or reading a bar code. Print-outs can also be made.
