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Grease Gun Flow Meter Instructions: Tracking Precise Ounces and Grams with Digital Lubrication Tools
Quick Answer: Use a positive displacement oval gear flow meter with a digital display for grease gun service. The meter records volume in ounces or grams and gives a pulse or 4-20 mA output. Silver Automation Instruments supplies these meters for bearing lubrication, assembly lines, and maintenance workshops.
Why Digital Grease Gun Flow Measurement Eliminates Guesswork
Most grease guns deliver inconsistent shots. One pull can be 0.5 ounces. Another pull can be 1.2 ounces. A digital flow meter removes this guesswork. It shows the actual dispensed volume on a local display. It can also send a pulse or 4-20 mA signal to a PLC. The PLC stops the gun at a preset gram value.
We have seen this problem on customer sites in Indonesia and Vietnam. A bearing service team used manual counting and overgreased motor bearings by 30 percent. The extra grease raised bearing temperature by 12 degrees Celsius. A small oval gear meter solved the issue.
Which Flow Meter Works Best for Grease and Lubricants
We recommend a positive displacement oval gear flow meter for grease. It works with viscous media from 100 cP to 50,000 cP. It handles NLGI 000, NLGI 0, NLGI 1, and NLGI 2 greases. The measuring gears rotate only when grease moves. Each rotation equals a fixed volume. The sensor counts rotations and converts them to ounces or grams.
For typical grease gun flow rates of 0.05 to 1 L/min, use a 6 mm oval gear meter. Stainless steel body with PTFE gears fits lithium, calcium, and polyurea greases. Maximum working pressure up to 40 bar is common. The display shows total and batch volume. You can set a batch setpoint of 15 grams for a bearing fill.
The Silver Instruments OG-06 model covers 0.05 to 1 L/min. The OG-10 model covers 0.1 to 10 L/min for larger dispensing systems. Both models have a local digital display and pulse output.
Installation Steps for a Grease Gun Flow Meter
Install the meter between the grease pump or gun outlet and the hose or nozzle. Keep the meter full of grease. Avoid air pockets because air causes false counts. Use a 100 mesh strainer before the meter to catch hard particles.
Step 1: Flush the line with clean grease. Step 2: Mount the oval gear meter in a horizontal position. Step 3: Connect the signal cable to the digital display or PLC. Step 4: Set the K factor from the calibration certificate. Step 5: Run 100 grams of grease and compare with a scale. Adjust the K factor if the deviation is more than 0.5 percent.
In practice, most engineers skip the scale check. That is a mistake. The meter K factor shifts slightly with thick grease. Calibration with a scale takes 10 minutes and prevents disputes on the production floor.
Converting Ounces to Grams in the Digital Display
Grease density changes with base oil and thickener. A lithium complex grease may have a density of 0.88 to 0.95 kg/L. The flow meter measures volume first. The display converts volume to mass using a user-set density value. If you fill 100 ml and the density is 0.90 kg/L, the display reads 90 grams. One ounce is 28.35 grams. One US fluid ounce is 29.57 ml. Do not mix mass ounces and volume ounces.
Set the density correctly for each grease type. A silicone grease may be 1.05 kg/L. A polyurea grease may be 0.92 kg/L. Wrong density input creates a 5 t
Field Notes from Lubrication Systems in Asia, Oceania, and the Middle East
Last year a manufacturer in Thailand used a Silver Instruments oval gear flow meter on an automatic bearing lubrication skid. The skid filled 8 bearings with 6.5 grams each. The old method used a timer. Timer-based filling varied from 5.2 to 8.1 grams. The new meter held accuracy within plus or minus 0.2 grams.
A mining workshop in Western Australia uses a grease gun flow meter with RS485 Modbus output. The maintenance crew tracks grease consumption by asset number. They reduced grease waste by 22 percent in six months.
A food canning plant in the Philippines uses the same meter on conveyor bearing lubrication lines. The digital display shows batch weight in grams. Operators no longer guess the grease volume on each shift.
Common Mistakes That Cause False Readings
Air in the grease is the number one problem. Air bubbles pass through the oval gears and produce counts with no actual grease. Use a pressure relief valve and keep the supply line full.
Here is the thing. Mounting the meter at the end of a long flexible hose also causes trouble. Vibration and hose whipping create noise in the pulse signal. Mount the meter close to the gun or on a fixed bracket. Use shielded cable for the signal wires. Keep the cable away from motor drives.
Do not use an electromagnetic flow meter for grease. Electromagnetic meters need conductive liquid. Grease is not conductive enough. Do not use a turbine meter because thick grease slows the rotor and causes undercounting.
How to Request a Quote with Your Grease Parameters
Send us your exact application data. We need grease type, NLGI grade, flow range in g/min or L/min, pressure in bar, temperature in degrees Celsius, and pipe size in DN. This helps us select the right meter size and seals.
You can reach Silver Instruments at Tel: +86-25-68650347. Use Whatsapp: +86-25-52155837 for quick questions. WeChat: +86 15365082610 is available for Asian customers. We ship from China to Southeast Asia, Oceania, Latin America, Africa, and the Middle East.
FAQ: Grease Gun Flow Meter Instructions
Can a grease flow meter really measure ounces and grams?
Yes. A positive displacement oval gear meter counts fixed volumes. The digital display converts the volume to mass with a density setting. It shows ounces or grams on the same screen.
What flow range do I need for a grease gun?
Most manual and pneumatic grease guns deliver 0.05 to 1 L/min. A 6 mm oval gear meter covers this range. For larger dispensing systems, a 10 mm meter handles 0.1 to 10 L/min.
Does the meter work with NLGI 2 grease?
Yes. Use a stainless steel body and PTFE gears for NLGI 2 grease. Maintain 5 to 40 bar pressure. Avoid suction conditions. Keep the line full.
Can I connect the meter to a PLC or digital display?
Yes. The meter provides pulse output or 4-20 mA HART output. Modbus RS485 is optional. The pulse count gives total flow. The analog output gives flow rate.
What accuracy can I expect on a grease gun?
Expect plus or minus 0.5 percent of reading after scale calibration. For small shots of 5 grams, the repeatability is about plus or minus 0.1 gram if the line has no air.
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