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Digital Pressure Gauges

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General Purpose Digital Pressure Gauges

Series:
PG5
General Purpose Digital Pressure Gauges
Enclosure Protection:
N/A
Relays:
N/A
Batteries:
1 9V (700 hrs)
Details

IP67 Digital Pressure Gauges with 0.25% Accuracy

Series:
PG7
IP67 Digital Pressure Gauges with 0.25% Accuracy
Enclosure Protection:
IP67
Relays:
Solid State
Batteries:
2 AA Alkaline (2,000 hrs)
Details

IP65 Digital Pressure Gauge with 5.5" Display

Series:
PG10
IP65 Digital Pressure Gauge with 5.5
Enclosure Protection:
IP65
Relays:
Solid State,SPDT
Batteries:
2 C Alkaline (8,000 hrs)
Details

IP65 Digital Pressure Gauges

Series:
PG2
IP65 Digital Pressure Gauges
Enclosure Protection:
IP65
Relays:
N/A
Batteries:
1 3V Lithium (2-3 years)
Range:
0-5,000 psi
Lightning Protection?:
No
Certification:
N/A
Details

How They Work

Digital pressure gauges use pressure transducers to provide a reliable, high accuracy reading on an attached digital display. Our display takes the signal from the transducer and processes it according to your settings to give you a pressure reading in the unit of measure of your choosing - adjusting it for activated features like tare or peak hold.

Unlike analog, or dial, pressure gauges, digital gauges are built for reliability in demanding conditions. Dial gauges require constant re-calibration and repair. One major dial gauge manufacturer estimates that in a typical plant, 25% of dial gauges need immediate replacement, and another 40% need corrective action. It’s a mess caused by inadequacies inherent in analog gauges.

On the other hand, digital pressure gauges are inherently durable. Especially our gauges. They’re built to withstand the tough stuff, like vibration, over pressure, water hammer, etc.

There is one moving part in a digital pressure gauge - the diaphragm. It’s a thin metal (316L SS) layer with an electric circuit attached to it’s back. As the diaphragm flexes under the pressure, the resistance on the circuit changes in direct proportion to the applied pressure. This is known as piezoresistive technology, and the circuit is called a Wheatstone bridge.

The diaphragm is definitely thin, and needs to be handled with care. But its designed to take the even pressure that comes when installed. In fact, it can handle an over pressure 2X it’s full scale and still operate normally.

In contrast, a dial gauge is all mechanical, full of moving parts and small gears. They are especially prone to over pressure and vibration. It doesn’t take much to send them to the re-calibration lab, or to break them altogether.

Vibration is a common problem in process plants, and pumps are a major source of that vibration. Monitoring pumps is critical (more on that later), but whatever gauges will be installed on or near pumps need to be able to handle the vibration. Our digital pressure gauges work perfectly in vibrating environments. Unlike a dial gauge, they’re legible under vibration as well.

In extreme environments, the display can be tethered to the transducer with a cable to prevent additional wear and tear on the electronics, further increasing the gauge’s lifespan. Tethering the gauge also increases it’s operating temperature, and is generally a good way to remove the electronics from process stresses.

Features

Our digital pressure gauges come with the most complete set of gauge functions on the market. Our most basic model offers all but a few of them. These are easily accessible (and easily locked) through the display interface.

Tare

The Tare function is very popular. It allows you to cancel out the existing pressure. It measures change from the moment you enable the function.

This is sometimes used to calculate weight. Our digital pressure gauges can be programmed to calculate weight in a hydraulic system. Once programmed, you can enable the Tare function to cancel out existing weight before a load is applied.

Peak Hold

Holding the peak pressure is another popular function. Peak Hold does exactly that. If you’re trying to monitor pressure peaks, then this is the function for you.

The digital gauge will still be actively reading pressure, you’ve just told it to not display anything but the peaks. This setting can be activated and reset at any point.

Units Of Measure

Choosing your unit of measure is part of the ordering process. But we’ve still included the option to change it at any time. Pre-programmed units include psi, bar, kPa, kgcm2, mbar, MPa, inHg, ftH2O, cmHg, inH2O, mmHg.

You can also create a custom unit of measure. This is done by entering a multiplier, or a conversion factor. For example, converting psi to ftH2O is easy, simply multiply by 2.31. So if it wasn’t already a standard option in the pressure gauge’s menu system, you could use the custom multiplier option to make the conversion.

Bar Graph

Our digital pressure gauges come with a bar graph. This let’s your instrumentation tech and your operators see pressure as a percentage of scale, rather than just a hard measurement. You simply set the low and high point for your bar graph, and the gauge does the rest!

Auto Off

To conserve battery life, each digital pressure gauge comes with an auto-off setting. This simply turns the gauge off after it’s been on a certain number of seconds. All you have to do is tell the gauge how many seconds to stay on.

Max/Min

Finally, you can toggle between the current reading, the most recent highest (maximum, or peak) reading, and the most recent lowest (minimum) reading. This is done right on the main screen by pressing the S, Select, or Down button, depending on the model you have.

Applications

Digital pressure gauges are an important part of any process that uses pressurized vessels or lines. They serve a vital safety tools to control pressure, and they help you keep your equipment running smoothly. When used right, pressure gauges are one of the most valuable instruments you can have.

Pump Control

We tend to think of pump control as turning pumps on and off. And when we’re discussing liquid level, that’s exactly they function they provide, a means of controlling when pumps run and, in the case of a VFD, at what RPMs.

But the best way to control a pump is not with level sensors, though they play a role too. It’s with pressure gauges. It also happens to be the old way, practiced for years as an effective method for keeping pumps, seals, and bearings working for many years at a time with no downtime. But as older engineers retired and newer technologies became the focus of later generations, we stopped using pressure gauge to control pumps.

Digital pressure gauges are used to monitoring the suction and discharge pressure on pumps. The differential between the two is critical, as are the individual readings. Operating the pump at the right differential pressure will ensure a long life of uninterrupted service. Click here to learn more about pump control with pressure gauges.

Filter & Control Valve Monitoring

Filters and valves need to be monitored constantly to know how they’re operating. Like a pump, filters and valves need two gauges installed, one on the upstream and downstream side.

A pair of digital pressure gauges will let you see flow decrease over time as the filter gets dirty and eventually clogs. This decrease in flow will be represented by an increase in differential pressure.

Control valves need gauges installed to show the operator how open or closed it is. This will also give an indication of flow via differential pressure. The pressure drop across the control valve is a critical value. Too big of a drop could create an over pressure on the upstream side, and starve the process on the downstream side.

Hydraulic Weight/Force

Pressure inside of a hydraulic column can be converted to pounds of force (or weight) by factoring in the area of the hydraulic ram. Our digital pressure gauges allow you to put in customer multipliers to measure in whatever unit of measure you need. So to measure weight from a hydraulic column, simply calculate your multiplier. The formula for this is area = pie X by the radius2(A=πR2). Enter the calculated multiplier and label the unit as LBS.

This is done to monitor force in hydraulic systems. A unique application of this concept weighs hay bales on a forklift to avoid spending thousands on an industrial weight scale. Virtually anything could be weight in this manner as long as you have an accurate measurement on the hydraulic column inside the forklift.

Difficult/Harsh Points Of Measurement

Our tethered digital gauges are ideal for placing the display and electronics in a safer or more convenient location. In many industrial settings, the pressure port is in a difficult place. Often the conditions are harsh right at the point of measurement - either the temperature is high, or vibration can be severe, or it may be particularly oil, dirty, or wet.

The best way to make pressure measurement easy in these environments is to tether the display to the transducer with a cable. This removes the electronics of the display from harsh conditions, and allows you to place the display in a much more convenient location.

Tethered digital pressure gauges come in handy in applications ranging from pump monitoring to pressure testing.

FAQs

Do your gauges work for both liquids and gasses?

Yes. Our digital pressure gauges work on all fluid types, provided there is good chemical compatibility, the pressure range specifications match up, and you have an appropriate mounting method.

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Can I program custom units of measure?

Yes. The gauges each come with an easy method to use a custom unit of measure using the push buttons on the gauge. Programming a custom unit of measure simply involves adding a multiplier that converts from PSI to your desired unit of measure. You then give the unit a label.

For example, if I wanted to convert PSI to Head or Feet of Water, I would use 2.31 as my multiplier, since I have to multiply PSI by 2.31 to get Feet of Water. I would then type in the label of my unit. I could call it FtH2O, or Head, or FtWater, etc. If I wanted Feet of Oil, then I would need to factor in the specific gravity of oil to come up with my multiplier. It's a little math, but you only have to do it once!

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How can I get my display in a more convenient location?

You would simply order a tethered version of your pressure gauge. This places a cable (as long as you need it) between the display and the actual sensing elements of the gauge. You can place your digital display where it can be easily located and read.

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Are your digital pressure gauges rated for outdoor use?

Yes, two of them are. Our PG7 and PG10 are suitable for use in outdoor environments with and IP67 and IP65 rating respectively.

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How long is the battery life?

The typical battery life for our PG5 is 700 hrs. It uses a standard 9V alkaline battery. The PG7 uses AA batteries. The alkaline variety will typically get you about 2,000 hours. A PG10 will get you 8,000 hrs typically with it's C batteries.

In all cases, upgrading to lithium ion batteries will give you more battery life.

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How accurate are your gauges?

Standard accuracy is a 0.25% error band, though we can go up to 0.01% on select pressure ranges. We offer NIST certification and recalibration services.

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