Pressure range: -0.100~5.000MPa
Operating temperature/humidity: -10℃~60℃; 35%~85%RH
Resolution Pressure: 0.001MPa; Temperature: 0.1℃
Accuracy Pressure: ±0.5% FS; Temperature: ±1℃
Battery life: 6 months
Battery: 3V button battery
Sampling rate: 1.2s
Low battery indication: Displays “LOB” at low battery
Display: 37 x 17 mm LCD/green backlight, automatically off after 6 seconds of inactivity
Measurement unit: MPa, kPa, bar, psi, kgf/cm2, mmHg
Out-of-range display: Pressure: FULL; Temperature: — —
– Pressurized refrigerant may remain in hoses. Point hoses away from you and anyone nearby.
– Safety gloves and goggles must be worn all the time during using the gauge.
– Avoid inhaling refrigerant steam, lubricant or oil mist! Inhalation of refrigerants at high concentration can cause arrhythmia, loss of consciousness, even asphyxiation!
– Exposure to refrigerants may cause frostbite or other injuries. Please disconnect hoses with extreme caution.
– If your eyes contact with the refrigerant, rinse them immediately and see a doctor.
In power-off mode, press and release the power button to turn on the gauge. Press and hold the power button for 3 seconds to turn it off.
In power-on mode, press and release the power button to turn on the backlight. It will be auto-off after 6 seconds of inactivity.
In power-on mode, press and hold ▼/ZERO for 3 seconds to zero. The gauge will display 188.8.131.52 and then zero the value. In power-on mode, press and hold ▼/ZERO for 3 seconds to restore. The gauge will display current relative pressure.
Press and hold ▲/SET and ▼/ZERO until ON is displayed, indicating auto-off function is enabled. The gauge will automatically turn off after 15minutes of inactivity. Press and hold ▲/SET and ▼/ZERO, until OFF is displayed, indicating the auto-off function is disabled. The gauge will run all the time and not turn off automatically
Select refrigerant types, shift temperature/pressure units:
Press and hold ▲/SET until “R” blinks, you may select the refrigerant type. Press and release ▲/SET or ▼/ZERO to scroll through refrigerant types. When “R” blinks, press and release /, temperature value flashes to indicate you may shift between temperature units. Press and release ▲/SET or ▼/ZERO to shift between Fahrenheit and Celsius. When the temperature value blinks, press and release /, pressure unit flashes to indicate you may shift between pressure units. Press and release ▲/SET or ▼/ZERO to shift between pressure units. When the pressure unit blinks, press and release / to exit settings. The gauge will come to normal display interface in 5 seconds of inactivity.
1.Connect the manifold to a system
Close high and low pressure valves.
– Connect one end of the blue hose to the low pressure side of the gauge, the other end to the low pressure side of the air conditioner/refrigerating system.
– Connect one end of the red hose to the high pressure side of the gauge, the other end to the high pressure side of the air conditioner/refrigerating system.
– Connect the yellow hose to vacuum pump.
Please note: Operate when the system shuts down.
2.Select the refrigerant
– Refer to the “Functions” section for selecting suitable refrigerant type.
3. Evacuate a system
– Turn on the vacuum pump.
– Open both high and low pressure valves and then other valves. The system starts evacuating.
– Check pressure on low pressure side down to -0.1MPa and continue evacuating for 10-30 min.
– If vacuum reached, close both valves. Finally close the vacuum pump.
– Keep the pressure for more than 5 min and check if the system leaks. If the pressure rises, there is leak in the system. You need to repair it first and then further evacuate it. If the pressure remains unchanged, evacuation ends.
Note: There must be no refrigerant in the system during evacuation, otherwise, recover the refrigerant first. Never discharge the refrigerant in the air.
4. Fill a system
– Disconnect the yellow hose from the vacuum pump and connect this hose to a refrigerant container.
– Open valve on refrigerant container (upward). Open the valve core on the gauge to evacuate the yellow hose. Put the upside of the container down. Open both high/low valves. The system will be filled with refrigerant to certain quantity (per system manufacturer’s requirement). Close both high and low valves and then put the container upward.
– Turn on the system.
– After 5-10 min, check if the system has normal high and low pressure (Please see the User Manual of the system).
– If the pressure is deficient, slowly open the low pressure valve when the system runs (it is forbidden to open the high pressure valve at this time), supplement gas refrigerant of proper quantity (place the container upward), then close low pressure valve. Check the system again.
– If the pressure is too high, slowly open the high pressure valve. Use a refrigerant recovery system to recover proper quantity of the refrigerant. Close the high pressure valve and check the system again.
– Turn off the system and close all the valves. Recover refrigerant residue with a refrigerant recovery system. Disconnect the refrigerant container and hoses. Keep them well.
Note: Do not use the gauge in hazardous or corrosive liquid, especially liquid ammonia or refrigerants that contain ammonia.
– Low power indicator
When the LCD displays “LOB”, it indicates the battery will run out and needs to be replaced by a new battery.
– Out-of-range display
When “FULL” is displayed, it indicates the pressure is out of range. Please break the connection of this pressure source.
– Storage requirements
The gauge should be stored indoor at -20~40℃ with relative humidity below 85%. The room should be ventilated without corrosive impurities.
– Other tips
Keep the gauge clean and threaded coupling undamaged. Check whether the hose ages and replace it when necessary. Check if the gauge leaks periodically.