![]() Step 2: Press the Zero button to cycle through the options until UNITS is displayed. ![]() Step 1: Press the On/Off button once to enter the main setup menu. Here are steps to program the multiplier into the gauge: Once you have determined the correct multiplier for your gauge and application you can set up the gauge to display the desired units. Programming Steps for Setting the APG Digital Pressure Gauge You can now move on to the programming steps. This equals 0.0098, which you enter into the custom multiplier screen on the digital pressure gauge. To get the multiplier that you'll enter into the gauge to display tons, divide the tons calculated above (49) by the psi full scale (5000). How To Calculate The Multiplier For Tons: So, when our hydraulic ram is pressing down to full-scale measurement on our 5000 psi gauge, we want it to display 49 tons. To convert this to tons, we will divide 98,125by 2000 lbs, or one ton, to get 49 tons. To determine the scale factor for tons, we convert the full-scale psi (pounds of force per square inch) to full-scale pounds. In our example with the motorcycle company, we would multiply the maximum output of the PG7 (5000 PSI) by the area of the hydraulic ram (19.625) to get 98,125 lbf, illustration below.ĩ8,125 lbf is a hard number to show on a four-digit display, so you (or, in this instance, our motorcycle manufacturing friends) will want to scale that reading to a larger unit of measure like tons for example. To do this, we multiple the maximum PSI of the digital pressure gauge by the previously calculated area. ![]() You will need to do some quick math to ensure the maximum measurement will fit on the pressure sensors display. It is important to note, however, that depending on the maximum pressure of your gauge, the measurement might be too long to fit on the 4-digit digital display of the To set the gauge to display in lbs, simply use the area (19.25) in square inches calculated in the previous steps as your multiplier, and skip to the programming steps below. How To Calculate The Force Applied By The Hydraulic Ram So we multiply π (3.14) by 6.25 inches (radius of 2.5 inches squared) to get 19.625 square inches as illustrated below. The formula for this is: Area = pi X radius squared. In this case, the force is calculated by determining the area of the bore/piston side as this is where the hydraulic fluid pressure is concentrated by the hydraulic pump. In order to get the PSI to lbs multiplier for our motorcycle manufacturing friends, we needed to calculate the piston area of the 5 inch diameter hydraulic ram, it is important not to confuse the area of the piston/bore side and the area of the rod side. How to Calculate the Area of the Hydraulic Ram When not provided, the area will need to be calculated. The manufacturer of the hydraulic ram will sometimes provide the area. Then, the multiplier for converting psi to lbs needs to be determined, using the area where the force is applied. To convert PSI to lbs, APG Sensors’ digital pressure gauges should be set up to use the "Custom Units of Measure" function, which will allow the sensor to read in pounds. Lbs of force, however, is not a unit of pressure displayed by our gauge therefore, the custom unit converter function that is built into all of our gauges needed to be used. Years ago, a motorcycle design and manufacturing company approached us about using one of our 5000 psi PG7 Digital Pressure Gauges to measure lbs of force from a hydraulic ram. How to Convert PSI to lbs Using an APG Digital Pressure Gauge: To convert PSI to lbs, simply multiply the pressure by the area over which the force is applied. PSI is a unit of measure for pressure, and pressure (PSI) is the amount of force (lbf) applied per unit of area (in2). The trick to understanding how this conversion works is to break it down into its base units. The principle behind the process is a simple conversion from one unit to another in this case the APG digital pressure gauge can convert PSI to lbs. APG gauges are able to display the pressure readings in a few industry-standard units as well as many other units for force by using a simple conversion factor or multiplier. This could be simply to display the actual force being exerted by a hydraulic ram in a familiar format. In a hydraulic system, it is often beneficial to not only display the pressure in the system but to also display the force being exerted by a hydraulic ram.
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