V-MGC Digital 2.2 Technical
data
Characteristics
and parameters
Measured
parameters
Temperature
ргоЬе
Cycle
measurement
Connector
Measurement
range
Overload
Accuracy
Optional
refrigerant
Measured
medium
Environmental
conditions
Shell
Characteristics
and parameters
Power
Screen
Warranty
data
Pressure: psi/kPa/bar/inHg
Temperature: °F/°C
Vacuum: Micron/kPa
2
0.33s
Compression fitting: 3*7/16UNF (1/4"SAE)
Low pressure: О-50Ьаг
High pressure: О-50Ьаг
Temperature: -20-70°С (-4-158°F)
Vacuum degree: 0-1 OOkPa
754psi, 52Ьаг, 5200kPa, 5.2МРа
Pressure: ±0.5% of full scale
Temperature: ±О.5 °С
Vacuum degree: ±5Micron
R 134a.R14,R141B,R143A,R152,R170,R21,R218,R22,R227,R245,R290,
R32, R401A,R401 В, R401 С, R402A, R402B, R403A,R403B, R404A, R405A,
R406A,R407 А, R407B, R407C, R408A, R409A,R409B, R41 ОА, R41 ОВ, R41,
R411A,R411 B.R412A,R41 ЗA,R414A,R415A,R417 A,R50,R500,R501,R502,
R503,R504,R507,R507A,508A,R508B,R509A,R600A.R744,R11,R113A,
R114,R115,R116,R12,R123,R123A ,R124,R125,R13,
Measured medium: 68 types
lmmeasuraЫe medium: R717 and other ammonia refrigerants
Working temperature:5-122°F/-15- 50°C
Storage Temperature: ±О.5 °С
Environment humidity: 10-90%rF
Material: АВS/РА/ТРЕ
Size: 190 х 140 x80mm
Weight: 800g(without batteries)
DATA
5*1.5v АА rechargeaЫe batteries
Lifetime: 150hours(No backlight)
LED , 0.5s (response time)
1 year
РО4
V-MGC Digital
5.2.5 Measurement about overheating and supercooling ( see figure В)
Overheating: it means the differences between the actual temperature
after the refrigerant leaving evaporator (sensor temperature) and the
boiling temperature in evaporator.
After the refrigerant boiling, the temperature keep heating up, the
temperature that exceeds the boiling is the degree of overheating. lf
under the worst circumstances (underloading fixed valve system), the
refrigerant must Ье evaporated completely when it nears Ьу the ending
of evaporator. ln this case, to prevent the liquid refrigerant from entering
into compressor is necessary.
The manufacturer of refrigerant system provides graph data that marks
the degree of superheat under the condition of indoor humidity's
temperature and outdoor air temperature.
То measure overheating is the most useful to repair fixed valve system
and judge the quantity of recharging the refrigerant and the proper
operating environment.
lf the degree of overheat is too high while others figure аге normal,
means to charge the refrigerant. Оп the contrary, reduce the refrigerant.
Supercooling: lt means that the differences between the refrigerant
boiling temperature in condenser and the actual temperature when
the refrigerant leaves condenser. The degree of supercooling is the
temperature under the boiling temperature. Under the worst
circumstances, the degree in underloading TXW would Ье lower.
lf the degree is down too fast, the liquid will backflow into the
compressor and damage it. ln the system with expansion valve
(TXV) , the degree of supercooling is the most useful information
of charging status. The purpose of this design is to ensure the constant
degree of superheat. А suitaЫe filling capacity сап extend the
system's lifetime and ensure the system's work efficiency.
Р13
