Yuanyin Cola Machine – Standard Operating Procedure for Calibrating High Pressure Gauge from Too High to 70–100 psi
I. Pre-operation Safety Instructions & Core Specifications
The equipment’s standard normal working pressure range is 70–100 psi. Throughout the operation, it is strictly forbidden to calibrate to a pressure above the 100 psi upper limit or below the 70 psi lower limit.
This equipment uses food-grade carbon dioxide cylinders. The cylinders and the filling gas are safe and compliant, with no related usage hazards.
Throughout the operation, ensure the high-pressure gauge dial is unobstructed, allowing clear observation of real-time pressure value changes.
The adjustment rod must be operated slowly and steadily. Rapid or large-scale rotation is strictly prohibited to avoid sudden pressure changes that could damage equipment components.
II. Step-by-Step Operating Procedure
Pre-depressurization Pre-adjustment
Confirm that the high-pressure gauge reading exceeds the standard upper limit of 100 psi. Holding the adjustment rod, slowly turn it counterclockwise for 3 full rotations to loosen it. After loosening, keep the position fixed to complete the pre-depressurization preparation.
Active Depressurization to Lower Pressure
Keep the adjustment rod position fixed. Directly pull out the gauge’s pressure relief ring outward to begin steady, continuous depressurization. Throughout the operation, keep your eyes fixed on the high-pressure gauge to monitor the pressure drop trend in real time.
Depressurization Termination Criterion
When the high-pressure gauge pressure steadily drops below 70 psi, immediately close the pressure relief ring to terminate the depressurization operation.
Precise Calibration and Locking
Slowly turn the adjustment rod clockwise in very small increments, each time no more than 1/4 of a full turn. After each adjustment, pause for 3–5 seconds to observe the change in the high-pressure gauge pointer. Continue until the pointer rises steadily into the standard range of 70–100 psi, completing pressure calibration and locking.
III. Post-operation Effect Verification
After calibration is complete, confirm that the pressure is stable within the standard range of 70–100 psi. Turn on the machine and test-dispense two cups of beverage. Throughout the test, observe the high-pressure gauge reading to ensure there is no significant pressure fluctuation, which would indicate normal operation.