Refrigeration Gauge
Refrigeration Gauge is an instrument specially used to measure pressure parameters in refrigeration systems. Based on pressure sensing technology, the internal elastic element deforms when subjected to pressure in the refrigeration system. This deformation is converted into the rotation of the pointer through a mechanical transmission mechanism, and the corresponding pressure value is indicated on the dial. It has the characteristics of intuitive and clear readings, high measurement accuracy, and adaptability to different pressure ranges of the refrigeration system. It can accurately reflect the pressure conditions of the refrigeration system during operation. It is widely used in various types of refrigeration equipment to help technicians monitor the pressure of the refrigeration system in real time and determine whether the equipment is operating normally, so as to promptly discover potential faults and perform maintenance and adjustments to ensure efficient and stable operation of the refrigeration equipment.
Zhejiang Hengsen Industrial Group Co., Ltd. is a high-tech enterprise specializing in the production of HVAC control products, pipe fittings, and refrigeration fittings. Hengsen is located in Zhejiang Zhuji, that is closed to Xiaoshan and Pudong international airports with good geographical and economic advantages. Through the in-depth implementation of the technical standards strategy, Hengsen accelerated the process of transformation and upgrading. Up to now, Hengsen has 5 subsidiaries, covering a total area of more than 80,000 square meters, with more than 500 employees and more than 100 professional technicians.
Why Choose Us
Rich Experience
We have more than 20 years of manufacturing experience in copper valves, water-heating pipes, and air-conditioner parts.
Broad Market
Hengsen has a number of offices in China, and its products have been supporting many Fortune 500 enterprises for a long time, and exported to South America, Europe, the Middle East, and other regions.
Professional Team
Professional team composed of professional technical personnel, from product design, and production to quality testing, every step of professional personnel responsible for.
High Precision
Professional equipment manufacturing high-quality products, automatic production, to ensure the beauty and quality of products.
Competitive Price
Manufacturers' direct sales can eliminate the intermediate steps, and provide the best service and affordable prices.
Good Service
We can provide ODM/OEM service according to customer requirements. Each customer has a person responsible for and is provided with a year after-sales guarantee.
What is Refrigeration Gauge
Refrigeration gauges are designed to provide information regarding the operational health of a closed refrigeration system. Most refrigeration systems, regardless of their application, require that pressure and temperature process variables be closely and continually monitored.
Benefits of Refrigeration Gauge
Accuracy
One of the key benefits of digital refrigeration gauges is their accuracy. With precise pressure and temperature readings, technicians can easily diagnose and troubleshoot refrigeration systems, ensuring their proper functioning. This not only saves time but also reduces the risk of system breakdowns and costly repairs.
Convenience
Digital refrigeration gauges also have a wide range of pressure scales and temperature units, allowing technicians to use them for different types of refrigeration systems. Their compact design also makes them easily portable, allowing technicians to carry them to different job sites.
Simultaneous Measurement
The simultaneous measurement of pressure and temperature is another advantage of digital refrigeration gauges. Technicians can compare the readings and quickly identify any discrepancies, making diagnosis and troubleshooting more efficient. This also eliminates the need for multiple gauges and thermometers, reducing clutter and streamlining the process.
Wireless Connectivity
Data logging and wireless connectivity are advanced features of digital refrigeration gauges that provide numerous benefits. These gauges can record and store data, allowing technicians to track the system's performance and identify any abnormalities or trends. With wireless connectivity, technicians can remotely monitor the system’s readings, making it easier to detect and prevent potential issues.
Energy Efficiency
Finally, digital refrigeration gauges have the capability to calculate superheat and subcooling. This feature enables technicians to accurately charge the system and maintain its optimal performance, ensuring energy efficiency and cost savings.
Pressure Gauges: These gauges display the refrigerant pressure readings from both the high and low sides of the HVAC system. They provide critical insights into the system’s performance and facilitate accurate troubleshooting.
Hoses: Hoses serve as conduits for connecting the manifold gauges to the system. They allow the flow of refrigerant and ensure precise pressure readings. It is important to use hoses of the correct size and quality to prevent leaks and inaccurate readings.
Valves: The valves on manifold gauges control the flow of refrigerant during pressure evaluation and system troubleshooting. They enable technicians to isolate specific parts of the system for analysis and adjustment.
Analog Gauges
These are the most used gauges – they are easy to read and handle. In the analog gauges, the needle position indicates the pressure, there’s usually multiple colored areas on the face of the dial that tell you the temperature of the refrigerant at that pressure, making it a little easier than pulling out a P/T chart and looking it up every time the needle moves.
Digital Gauges
Compared to analog gauges, digital gauges are more efficient – they provide the pressure readings in numbers, down to 1/10th of a PSI. You don’t need to convert the readings, reducing the chances of making an error. What makes Digital gauges useful is the additional features, automatic calculations of Pressure to temperature, most of them have either Bluetooth temp clamps for the pipes.
How to Select a Refrigeration Gauge
Size
The larger the dial face, the more gradations it will have for more exact readings, and the easier it can be seen from a distance – an important consideration if technicians cannot get close to the gauge. Another factor to keep in mind is that the size of the end connection will determine what sizes of gauge are available. For example, a 1.5″ gauge is too small to accommodate a ½ inch size connection, based on the wrench flat area in proportion to the case profile.
Temperature
Both the ambient temperature and media temperature will determine the material of the wetted parts (brass, stainless steel, nickel alloy, etc.) and whether it will have a dry case or be liquid-filled. The lower the ambient temperature, the more likely it is that a liquid-filled gauge is the right choice. Gauges in extremely cold environments, like the oil fields around the Arctic Circle, are filled with a special low-temperature silicone oil to prevent the internal parts from icing.
Application
Gauges for drinking water applications need to be lead-free, while process industries like refineries and pharmaceuticals require industrial process gauges. Cryogenic gas tanks call for a pressure solution that measures both differential pressure and working pressure, and is cleaned for oxygen service. Gauges used in sanitary processes must have a hygienic design. The highly aggressive gases used in the semiconductor industry means these applications need gauges with an ultra-high purity (UHP) design.
Media
A brass (copper alloy) gauge is suitable for water, air, or other non-aggressive liquids or gases. But sour gas (hydrogen sulfide), ammonia, creosote, and other harsh chemicals require corrosion-resistant materials such as stainless steel or a nickel-copper alloy. For media that can clog gauge mechanisms, opt for the addition of a diaphragm seal, which provides a physical barrier between the fluid and the pressure instrument.
Connect the high-pressure side of the cooling line to the red port on the gauge.
The red port and red gauge are always high-pressure gauges. You will want to attach a code-approved red hose, which is made to withstand high pressure, using the flare fittings that are included with it, to the high-pressure port on the cooling unit. The high-pressure port can be of a different size and thread pitch than the low-pressure side in order to avoid the potential for accidental incorrect hookups.
Connect the low-pressure side to the blue port of the gauge.
The low-pressure side will be connected with a blue low-pressure hose to the blue pressure gauge and the low-pressure side of the cooling unit. It allows the proper flow of vacuum pressure in order to determine the vacuum pressure in the system.
Attach a waste hose or vent hose to the center of the manifold set up.
In case of discharging the unit, or venting freon by attaching the unit, you will need to attach a larger black low-pressure hose to the center port of the manifold. By doing so, you will be able to attach a refrigerant recovery bottle to the manifold set to avoid violating federal law regarding the release of refrigerant into the atmosphere.
Attach micron meters or other gauges to the additional ports.
The additional ports on the manifold can be used to attach micron (vacuum pressure) gauges, or even a vacuum pump that can be attached to some piece of furniture in order to perform the proper services to the cooling system as required for the repair that you are making.
Always stand directly in front of the gauge to avoid the parallax error. This error occurs when the needle appears at a different position when viewed from an angle other than straight on.
A sudden drop in the needle can be an indication of a system pressure loss, which could be due to a leak or a malfunctioning component.
Regularly calibrate the pressure gauge to maintain its accuracy. Calibration requires checking the gauge’s readings against a standard at regular intervals and adjusting the gauge to align it with this standard if any discrepancies are found.
Inspect the pressure gauge regularly for any physical damage. Damaged gauges will provide inaccurate readings and should be replaced.
To prevent the gauge from regularly reaching its maximum reading and thus running the risk of overloading, select a gauge with a maximum pressure rating that exceeds the system’s normal operating pressure by around 25%.
Safety Gear
Before you start, suit up. Safety gloves and glasses are your best defense against accidental exposure to refrigerant.
Proper Procedures
Always follow the manufacturer's instructions when connecting and disconnecting your gauges.
Safe Handling of Refrigerants
Remember to play it safe. These substances can be harmful if not handled correctly.
Understanding Refrigerant Hazards
Refrigerants are not your everyday substances. They can be harmful if inhaled or if they come in contact with your skin. So, be aware of the hazards.
Ensuring Proper Ventilation
When working with refrigerants, make sure you're in a well-ventilated area.
Calibrating your Refrigeration Gauges
It's important to check your gauges periodically to be re-calibrated so that your work will continue to be accurate and efficient. This guide will describe two easy ways to calibrate your gauges. The first is a simple zeroing, and the second will calibrate your gauges against actual refrigerant.
Step by Step to Zero the Gauges
- First, disconnect all hoses from the gauge set
- If your gauges have rubberized coverings on them, you will need to remove these to either zero or calibrate the gauges.
- Remove the plastic lens covers from gauge faces. They should pop off.
- In order to zero the gauges, use the screwdriver to turn the screw on the face of the exposed gauge. This changes the resting position of the needle. You should set this to zero on both the low-gauge and the high-gauge
- Note that sometimes jostling of the unit can result in the miscalibration of these gauges. Make sure they remain zeroed as you replace the protective coverings
- Replace the plastic lens cover and plastic gauge covers, then attach your hoses
Step by Step to Calibrate the Gauges using Refrigerant
- Connect the tank of refrigerant to your gauge
- Turn the tank of room-temperature refrigerant upside down, so the pressure coming from the tank is the result of the liquid in the tank, not the gas. Make sure to open the lines to the gauge being calibrated.
- Remove any rubber covers to the gauge faces
- Remove the plastic lens covers from gauge faces. They should pop off.
- Take a reading of the temperature of the liquid inside your refrigerant tank, if you have an Infrared Thermometer. If you only have access to the ambient temperature in the room, make sure the refrigerant tank you're using has been acclimated to that room temperature for at least one day.
- Use your Temperature reading and your Temperature/Pressure chart to obtain the amount of pressure coming from the tank into your line to the gauge being calibrated
- This number from the chart is what your gauge should show. If your gauge is correctly displaying the pressure from the tank, it is calibrated
- If the number you are expected is not being read from the gauge, use the screwdriver to adjust the screw on the face of the gauge to read that number
- Switch gauges and make sure to perform the same process for each one. Make sure refrigerant remaining in hoses is recovered and not released into atmosphere.
Our Certificate
FAQ
We're professional refrigeration gauge manufacturers and suppliers in China, specialized in providing high quality custom service. We warmly welcome you to wholesale high-grade refrigeration gauge from our factory.
Car Refrigerant Gauges, 410a Refrigerant Gauges, R32 Refrigerant Gauges