Petroleum Liquid-Level Gauge
Accurate, reliable level measurement keeps petroleum operations both safe and efficient — from the tank farm to the delivery truck. For over 75 years, Krueger Sentry Gauge has built the instrumentation petroleum companies count on, and we build it in Green Bay, Wisconsin using components produced by us or other American manufacturers to comply with the Buy American Act.
Our in-house machine shop lets us tailor a gauge to almost any tank, fitting, or fluid — in sizes from 6 to 144 inches — without a significant price increase. Whether you are storing fuel oil, dispensing gasoline, or transporting refined product, we offer a gauge built for the job, including:
- Overfill Alert Gauge (Type PO and Type O-S3)
- All-Plastic and All-Stainless-Steel Liquid-Level Gauges (Type PH and Type H-S3)
- Direct-Reading Liquid-Level Gauge (Type PD and Type D-S2)
- Barrel Gauge (Type PB and Type B-S3)
Petroleum Liquid-Level Gauge Applications
The petroleum industry touches nearly every part of modern life — roughly 30 billion barrels of oil are consumed worldwide each year, adding close to $2 trillion to the global economy. Our experience across exploration, refining, transportation, and distribution is what sets Krueger Sentry Gauge apart, and it lets us recommend the right gauge material and type for each application. Common applications include:
- Exploration & extraction
- Refining
- Fuel oil storage
- Gasoline dispensing
- Bulk transport
- Bio-diesel & E85
- Diesel exhaust fluid (DEF)
- Backup generator tanks
- Waste-oil collection
- Hydraulic & lubricating oil
Fluids Our Petroleum Gauges Handle
Petroleum operations move a wide range of fuels and fluids, each with its own handling and compatibility requirements. We build gauges in stainless steel (316L) as well as plastics and other chemically resistant materials so the wetted parts stand up to what you store. Fluids we regularly gauge include:
Diesel Fuel Level Guages
Diesel is one of the most common fuels our customers store and dispense. Our At-A-Glance and Therma gauges give operators an accurate reading on bulk diesel tanks, backup-generator day tanks, and delivery vehicles, so you always know how much fuel is on hand and can load and unload safely.
Gasoline Tank Level Gauges
Gasoline’s volatility makes reliable level indication a safety essential. Our gauges provide a clear, continuous reading during loading and unloading, helping prevent overfills and spills at the terminal, the retail site, and everywhere in between.
Biofuel and E85 Level Gauges
Ethanol blends such as E85 and bio-diesel can be harder on standard materials than conventional fuel. We match the gauge’s wetted components to the blend you handle, so you get long-term accuracy without premature wear.
Diesel Exhaust Fluid (DEF) Gauges
DEF requires materials that won’t contaminate the fluid or corrode over time. Our stainless-steel and plastic gauges are well suited to DEF storage and dispensing tanks, protecting both the fluid and the equipment it serves.
Waste Oil Gauges
Waste-oil collection tanks are easy to overlook until they overflow. Our gauges give shops and fleets a clear reading on used-oil storage so it’s emptied on schedule and never runs over, with wetted parts that stand up to dirty, variable media.
Hydraulic Oil Gauges
Clean, well-managed hydraulic oil keeps equipment running. Our gauges provide accurate readings on hydraulic storage and reservoir tanks, helping you track usage and top off before levels get critical.
Transmission Fluid Gauges
Transmission fluid storage calls for accurate indication and materials that won’t contaminate the fluid. Our stainless-steel and plastic gauges are well suited to ATF storage and dispensing, protecting both the product and the equipment it serves.
Brake Fluid Gauges
Brake fluid is hygroscopic and sensitive to contamination, so the tank it’s stored in matters. We match the gauge’s wetted components to the fluid, giving you dependable readings without compromising fluid quality.
Built for the Industry That Keeps the World Moving
The petroleum industry powers transportation, manufacturing, and the products people use every day, and the companies that run it can’t afford guesswork when it comes to what’s in the tank. At Krueger Sentry Gauge, we’re proud that our American-made instrumentation helps make this industry safer and more efficient, one accurate reading at a time.
Frequently Asked Questions
Got questions? Get answers instantly by browsing our FAQs below, chatting with our AI assistant, or reaching our to our team directly.
What do we use as a part number?
At Krueger Sentry, we don’t use classic part numbers. Everything is description-based. Refer to your product’s Spec Page (materials options) and the Order Info (tank measurements) page for more information. Example Part Number: – H-2-48 + 12 w/glass (H signifies the type of gauge, 2 is the size opening, 48 is the tank depth, 12 is the extension, and everything after that is the options you want to be included.
Which liquid level monitor is the right choice for me?
When choosing a liquid level gauge, different factors can change which sight gauge is best for you. The basic factors that motivate people to buy each type of gauge are as follows.
- Economical sight gauge- At-A-Glance Direct Reading
- Versatile sight gauge- Therma Gauge
- Small tank monitor, under 12 inches – The L Gauge
- Standard Barrel Level Gauges – Barrel Gauge
- Up to 12 feet of mechanical remote capability – Remote Reading Gauge
- Durability – GFK Gauge – you can achieve this durability by ordering a therma gauge with a gauge guard as well.
How do I find or locate a Krueger Sentry Gauge distributor?
Search our Preferred Distributor Page. Don’t see a distributor you want to use? Call me. Lee Geurts: 920-434-8860 ext 204
Which sight gauge do you recommend most often to your customers?
I try to sell the Therma gauge to most people. It is nearly as inexpensive as the At A Glance Gauge, but you have more control over your swing arm. Plus, this level gauge can be fitted with the most options.
What is the difference between the Type D At a Glance Level Gauge and the Type H Therma Level Gauge?
The Swing arm on the Type D Gauge is fixed. When you thread in the gauge, the swing arm spins inside the tank and will end up facing in a random direction. The swing arm on the Type H Gauge can be aimed in the exact direction you want it to swing, and when you thread the gauge in it does not spin inside the tank.
How long is the swing arm on a level gauge?
The arm is always half the depth of your tank.
How do I order a custom-size level gauge?
In order to get an accurate gauge for your tank, we take two measurements into consideration. First, we measure, in inches from top to bottom, what the distance is from empty to full, known as tank depth. Second, the distance from the full mark to the gauge fitting on top is also known as an extension length. Sometimes this measurement comes out to zero.
How do I prevent my tank gauge from getting damaged by the sun and weather?
Ordering upgraded options such as Solid Glass Tops and Gauge Guards will make your Krueger Gauge nearly impervious to weather, sun, and damage.
Can I repair just the top of my Tank Gauge, or do I need to replace the whole thing?
If your gauge still seems functional, you can replace just the top components by ordering the corresponding repair kit. Repair Kits are available for all gauge types and come in a variety of material options for added durability, which can be found in the Tank Gauge Accessories.
What is the recommended maintenance/testing for Krueger Leak Gauges?
Krueger Sentry provides a Leak Gauge Functionality / Calibration Testing Report with inspection procedures for inspectors/technicians. Please contact us with any questions.
