Help: How do I read the readings on this gauge?

Depending on the model of the cryopolymer refrigerant, the temperature can be read accordingly

Depending on the type of refrigerant, the corresponding color is used

Can temperature and pressure be read simultaneously?

The outer pressure is 0.7 MPa; the temperature for the refrigerant R407C is 10, for R134a it is 30, for R22 it is 15, and for R404a it is 9

It is that the saturation temperatures vary under different pressures; the temperatures of different substances also change with pressure. Those inner circles contain the refrigerant

I. Classification of refrigeration pressure gauges: They are generally divided into “high-pressure gauges” and “low-pressure gauges”. 1. The maximum reading on a “low-pressure gauge” is usually 1.5 MPa or 1.8 MPa. 2. The maximum reading on a “high-pressure gauge” is usually 3.5 MPa or 3.8 MPa. II. Reading the pressure value: 1. The values on the outermost ring of a low-pressure gauge are in MPa; for example, if the pointer points to 0.3, the current pressure is 0.3 MPa. 2. The value indicated by the large black numbers on the outermost ring of the pressure gauge is in MPa units; if the pointer points to 2, then the current pressure is 2.0 MPa. 3. Conversions between different pressure units: 1 MPa = 10.2 kg/cm² = 10 bar = 145 Psi. Reading temperature values: 1. For low-pressure gauges, counting from the outside in: The first ring, in black, shows the pressure value in MPa (megapascals). The second ring, in green, shows the temperature of R407C in degrees Celsius. The third ring, in red, shows the temperature of R134a in degrees Celsius. The fourth ring, in green, shows the temperature of R22 in degrees Celsius. The fifth ring, in green, shows the temperature of R404A in degrees Celsius. If a chiller uses R22 as its refrigerant, and the low-pressure reading is 0.4 MPa, then the corresponding evaporation temperature is approximately 0 degrees Celsius. If a chiller uses R134a as its refrigerant, during operation, a low-pressure of 0.3 MPa corresponds to a condensation temperature of around 8 degrees Celsius. 2. High-pressure gauge: Starting from the outside and moving inward, the first ring is black and indicates the pressure value in MPa (megapascals). The second ring is green and shows the temperature of R407C, in degrees Celsius. The third ring is red and indicates the temperature of R134a, also in degrees Celsius. The fourth ring is green and shows the temperature of R22, in degrees Celsius. The fifth ring is green and indicates the temperature of R404A, in degrees Celsius. If a chiller uses R22 as its refrigerant, then at an operating pressure of 1.8 MPa, the corresponding condensation temperature is approximately 50 degrees Celsius. If a chiller uses R404A as its refrigerant, during operation, a high-pressure of 1.8 MPa corresponds to a condensation temperature of around 45 degrees Celsius. Four additional notes: 1. MPa means megapascals; kg/cm^2 means kilograms per square centimeter. 2. Different pressure gauges may use different units for pressure, so it is necessary to check the markings on the gauge face before reading the pressure. 3. Refrigerators and air conditioners generally use R22, R407C, and R134a ； Refrigerator R22 R404A ； Home air conditioners: R22 or R410A ； For car air conditioners, R134 and R12: 4. When the compressor is not running, the pressure is at equilibrium, meaning that the high pressure and low pressure are equal; this pressure value corresponds to the ambient temperature or the temperature of the coolant in the radiator. For R22, when the ambient temperature is 30 degrees, the equilibrium pressure on the pressure gauge is approximately 1.1 MPa; whereas when the ambient temperature is 10 degrees, the equilibrium pressure is about 0.6 MPa

Black represents pressure, red represents temperature, and the others indicate the cooling temperatures of the respective refrigerants

This is actually the saturation temperature of various refrigerants at different pressures. The black color on the outer ring represents pressure, while the different colors on the inner ring indicate various types of refrigerants. By determining which type of refrigerant is used in your freezer, you can read the corresponding temperature.