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Lincoln Flow Meter Instructions: Calibrating Digital Grease Gun Volumetric Measuring Tools
Quick Answer: Calibrating a digital grease gun volumetric measuring tool means checking the displayed volume against a known reference volume. Use a positive displacement oval gear meter for grease because that meter matches the tool principle. Adjust the K factor only after you bleed air and confirm temperature is stable.
What the Lincoln Manual Calibration Section Covers
The Lincoln flow meter instructions for digital grease gun volumetric tools describe the menu path for calibration, the pulse per unit setting, and the air bleed procedure. Most field technicians start with a known 500 ml container. They dispense ten strokes and compare the total volume.
The tool calculates volume from gear rotation or piston position. A digital display shows grease volume in cm3 or oz. If the displayed value drifts more than 2 percent from the reference, you adjust the K factor.
Tools You Need on Site
Keep a calibrated reference meter, a stopwatch, a clean container, and a thermometer. Grease density and viscosity change with temperature. A 10 °C change can move the reading by 0.8 percent on some NLGI 2 greases. We have seen this on customer sites in Malaysia and Brazil.
Step by Step Calibration Procedure
Fill the grease gun with test fluid. Remove air pockets. Air causes a large error because the tool counts volume pulses without fluid. Bleed the hose at the outlet until grease flows without bubbles.
Set the reference meter in line. Silver Instruments supplies oval gear flow meters in DN4 to DN25 sizes for grease calibration benches. Connect the outlet of the gun to the meter. Do not use a turbine meter. Grease flow is too viscous and intermittent.
Dispense a known volume. For a 500 ml reference, use 10 full strokes if each stroke is 50 ml. Record the reference volume and the tool display. Calculate the deviation as a percentage.
If the deviation is over 2 percent, enter the K factor adjustment in the tool menu. Some Lincoln models need a password. The default password is often 0000. Check the manual for your exact model. After adjustment, run two more tests. The second and third results should match within 1 percent.
Common Calibration Errors Field Technicians Make
One error is skipping the air bleed. Another is using a reference container with a wide neck. Evaporation or spillage gives a false low volume. Use a narrow neck graduated cylinder or a sealed reference meter.
In 2024 a grease distributor in Vietnam asked us why the tool read 12 percent
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Temperature matters. Grease viscosity at 20 °C can be three times higher than at 40 °C. If you calibrate in an air conditioned workshop and then use the gun outdoors, the reading changes. Record the fluid temperature at calibration and at use.
Why a Positive Displacement Meter Works for Grease
A digital grease gun measures volumetric flow. An oval gear flow meter does the same. The oval gear meter captures a fixed volume per gear revolution. The output is a pulse. Each pulse equals a small volume like 0.5 ml. This works well because the measuring principle matches the tool.
Silver Automation Instruments recommends oval gear meters with PPS or 316 stainless steel bodies for grease. The PPS body suits NLGI 000 to NLGI 2. The 316 body handles food grade grease and aggressive additives.
What to Ask Before You Buy a Reference Meter
Send us the grease type, viscosity in cP, working pressure in bar, temperature in °C, and required flow range in kg/h. Also tell us the pipe size DN. We will recommend a meter model and a pulse output setup.
A common setup for a grease gun calibration bench is a DN6 oval gear flow meter with 4-20 mA and pulse output. A DN6 meter covers 0.5 to 50 kg/h. For higher flow, use a DN10 or DN15 meter.
FAQs
1. How often should I calibrate a digital grease gun volume meter?
Every 6 months or after 5000 dispense cycles. If the tool is used in hot or dirty areas, calibrate every 3 months.
2. Can I use water to calibrate a grease meter?
No. Water has much lower viscosity. The internal leakage is different. Use the same grease or a calibration oil with similar viscosity.
3. What is a normal K factor for a grease meter?
It depends on the gear size. For a DN6 oval gear meter, the K factor is often around 2000 pulses per liter. Confirm with the meter certificate.
4. What if the display jumps even when no grease flows?
Check the sensor cable and the battery. Electrical noise can cause false pulses. Route signal cables away from motor drives.
5. Does Silver Automation Instruments sell complete calibration benches?
We supply reference meters, displays, and pulse scaling modules. Many customers build a bench with a local fabricator. Send us your stroke volume and pressure. We help size the meter.
Contact Silver Automation Instruments. Tel: +86-25-68650347. WhatsApp: +86-25-52155837. WeChat: +86 15365082610.
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