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Diaphragm vs Piston Gauges
Piston Style
These gauges measure pressure drops using precision machined metal piston encapsulated in a PTFE seal. This creates similar seal to a hypodermic needle. Despite the accuracy to which these seals are machined, there is still a small amount of leakage that occurs around the piston. This is why a piston gauge should not be used for liquid level applications or leak detection systems. Instead, they are recommended for filtration systems and flow rate applications.
Advantages of Piston Gauges:
• Lower costs
• Higher temperature capabilities
• Higher-pressure ratings
• Higher differential pressure ranges
Diaphragm Style
This type of gauge utilizes a rubber diaphragm to measure pressure. This creates a perfect barrier through the gauge and allows for zero leakage. Because they create a perfect seal, they are best suited for liquid level applications and leak detection systems. As the diaphragm size increases, the sensing area also increases. This is why larger diaphragms are used on low pressure ranges, such as the 400DGC.
Advantages of Diaphragm Gauges:
• No flow through gauge
• More sensitive measurement
• Lower pressure ranges available
• Can have a zero center dial
Application Examples
Filtration
By measuring a pressure drop across a filter, operators can get a visual indication about how dirty their filter systems are. Common accessories include color bands and electrical switches for alarms.
Liquid Level
Measuring liquid levels for cryogenic storage vessels is one of the largest developing applications for differential pressure gauges. Common accessories include panel mount dials, dense mark dials, and vertical calibration
Flow Monitoring
Using the Bernoulli Principle, differential gauges can convert pressure drops to flow rates. We can customize gauges to your exact flow data. Common accessories include pipe mounting kits and dual scales
Leak Detection
A differential gauge is a great tool for detecting leaks in systems. A reference tank can be used to test leaks in storage vessels or you can use a gauge over a length of plumbing to detect a pressure drop.
With over 30,000,000 design combinations, it can be difficult to decide on the exact right gauge. This brief overview should give you a great start.
Commonly Used Accesories
Liquid Filling
Glycerin or silicone dial case fills for reducing vibration and preventing fog buildup.
Color Band
Customizable three color indication at key pressure points in system.
Mounting Brackets
2″ pipe or wall mounting brackets that work with all precision gauges and ease installation.
Dial Sizes
Distributors and manufacturers can choose from a wide variety of dial sizes and options to best meet their compatibility needs
Follower Pointers
Detect pressure peaks throughout the day without needing to always watch the gauge.
Portable Kit
Use one gauge to monitor multiple devices with a portable kit
Electrical Switches
1 or 2 SPST or SPDT switches that can be set and field adjusted to the pressure range.
Filter Head Mount Kits
Hardware can be supplied to directly connect to large bag housings and filter heads
Piston Gauges
DX10
(11 Available Ranges)
- High System Pressure (1500 psi)
- Ideal for Liquids
- Only available in Stainless
- 3% accuracy with 11 available ranges
- Lowest Cost Precision Gauge
200DPG
(3.5-1000 PSID Ranges)
- Highest System Pressure (6000 psi)
- Ideal for Liquids
- Great for Filters and Hydraulics
- Lowest Cost Precision Gauge
Diaphragam Gauges
GX100
(4 Different Ranges)
- HighSystem Pressure (1500 psi)
- 5% Accuracy
- Aluminum Only
- Rolling Diaphragam Design Can Not Withstand Reverse Pressure
- Gases and Liquids
- Lowest Cost Diaphragam Gauge
200DGR
(3.5-100 PSID Ranges)
- HighSystem Pressure (3000 psi)
- 2% Accuracy
- Aluminum, Brass, 316 Stainless
- Rolling Diaphragam Design Can Not Withstand Reverse Pressure
- Gases and Liquids
- Great for Filters and Hydraulics
300DGC
(1-60 PSID Ranges)
- 1500 PSI Max
- 2% Accuracy
- Aluminum, Brass, 316 Stainless
- Convoluted Diaphragm Can Withstand Reverse Pressure
- Widspread usage in Cryogenics
- Can have a “Zero Center” dial, where pointer rests at 12 o’clock position
400DGC
(1-25″ H2O Ranges)
- Low differential pressure ranges with high system pressure rating (500 psi)
- Machined metal body can be completely customized
- Great for balancing and other highly sensitive applications
- Most advanced gauge in product line
600DGC
(1-50″ H2O Ranges)
- Low differential pressure ranges, however also low system pressure rating, only 35 psi
- Dial comes with panel mount hardware free
- Molded Nylon body with both rear and inline connections
- Ideal application is HVAC and flow balancing