# Learn How to Program Gems' DM21 Series - 1/8 DIN Meter/Totalizer

Product Manager, Carl Schoenherr, demonstrates how to program.

Video Transcript:

Welcome, my name is Carl Schoenherr. I work with Gems Sensors as a Product Manager. One of the products I support is the DM-21 Meter. Which is right here. What I'm going to do is show you how to actually calibrate the meters so that it works with our flow sensors, either the RotorFlow or a turbine type meter.

The turbine I actually have wired to the device. Both devices put out a pulse meaning when water goes through it a pulse signal is generated that the meter will then interpret and put on its display, either you know some type of units. Gallons per minute, liters per minute, and so on. The meter is also capable of giving you a total as well as a rate.

A total I think of it like when you're driving in a car, your odometer keeps track of your total miles that you did on your trip if you went 700 miles or so. Your rate is like your speedometer, you go so many miles per hour. In this case I'm going to program it gallons per minute for your rate but for your total it would just be in increments of a gallon. It's a very small sensor so it takes a long time for a gallon to go through it. But here now I will program it for you. You'll see on the front there's four keys. This program button I'm going to press and hold for 3 seconds and what it will do is bring me into what is called the program mode. In the program mode there's going to be five steps with what we are going to do. The meter does come with a manual. It clearly states how to do everything here. We also have a little cheat sheet I call it which is two pages because really there are only those basic steps that you need to do.

So let's go through the basic steps to get the meter working. cCAL that's your count calibration factor meaning what is it going to total and is it going to total in gallons or liters. The formula will be shown to you shortly but all you need to know is for this unit, how many pulses equal one gallon. Knowing that, I'll put the number in using these two keys the left. You'll see as I press one of the keys it will increment and the number I wanted to put in is what is in here now is zero. And you use the other key to move you over to the next place where you want to increment your digit to whatever you need based on the formula. Okay, so right now I've entered the number .1204 into the meter. You press the program key. A common question is, "Hey if I get tired and I stopped in the middle of this does it lose its programming?". The answer is no it does not. You can unplug it, all the programming remains. That's your cCAL. Your decimal point is where you actually choose to put the decimal point when you actually view it. I've chosen three but again, you could choose different amounts of decimal points. You'll see where the decimal point is blinking. I've chosen three. You could also choose two or a different one. You press your program key, it stores the value.

The next thing you're going to press is rCAL. Your rate calibration decimal point. Most flow sensors put out a lot of pulses. You'll always want your decimal point way to the left just for putting in your calibration factor because it's a small number. Again the math will be shown to you shortly. It's all based on just knowing the pulses that equal one gallon. The rCAL that you'll actually put into the unit and you can scroll through it as I say with the program to you. So let me do it. This is the number I wanted and again if I did not want that number I could choose any other number by just blinking if I wanted that to be a six let's say, you just keep hitting this key and it increments down eventually it gets to zero and then starts again. But I wanted that number .7228. I'll press the program key, it stores it. The last is my decimal point for the rate value. For the rate I'm going to make it two decimal places so we can see when we go out that rate is in two decimal places and the total is with three.

The last thing we're going to do is the input. The input is what is the actual device that's going into this. Is it a sinking device or is it a sourcing device. Here you'll see the choices. It's a mag probe. A sourcing device or a sinking. Again, a mag probe sourcing device or sinking. This is sinking. Whereas the RotorFlow is actually a sourcing device, but here I've programmed it in. Right now we're done. We can press our key. Will hold the program key for three seconds and what will happen is it goes back into what we call the run mode. In the run mode it displays the rate meaning how fast are you going. Right now there's nothing going through the sensor so it's going zero. Another thing, as you press the program key it tells you the count. How far did you go? Your odometer? How many gallons have gone through? Well we haven't blown through it yet or haven't passed any liquid through it. It said zero. Next thing, it also gives you is a high alarm value. It also gives you a low alarm value. The alarms could be like in your car. I don't want to go over 70 miles an hour and I don't want to go under 60. It could actually give you alarms. If you're over 70 a light will go on. If you're under 60 a light would go on. You see the two alarm lights are on the far right-hand side. So right now let's go back into the rate mode which is the sensor and then I'll blow through it just to simulate that the numbers will increase. Takes about a second and then we'll go back to zero. It sees no change. The next thing you have is the count mode which is your total. Since I've blown through it, it accumulated a little bit of gallons. Again it's a very small sensor but as you blow in it you'll notice this number only does one thing, just like in your car. It only increments. So there we have it. It's up to now the number 23 and if you want to reset it you just hit the reset button, just like you do in a car to reset it to take another trip.

The next button you press would be for a high alarm and this is for the rate. Let's say when you're traveling if you're going if we go over half a gallon a minute through the sensor, a light will come on. And also a relay will come out the back which you could turn something on or off. The next button is your low alarm and inside the low alarm we have it listed as .1 meaning anything below .1 will be an alarm condition. So the good flow will be anywhere between .1 and .5.S o let's take a look at it. If you wanted to change it, again you use these two keys and you can change it. You go to whatever digit you want and all you do is change the number. Let's leave it at what we have. We're in the rate mode. You see the alarms on because we're below .1. As you blow into it the display will turn green for good and then back into a red mode if we get above .5. So you see that we're at .3. It will go to 0. You'll be back in an alarm mode. You see your alarm lights on the far right-hand side. So again you blow in it if it goes above .5 you'll see it. Let's take a look at the total. Your total is just a display of how many gallons have passed through the sensor. You'll see it's at .39 now. If you blow in it, all that happens is that you'll add to what is there. We've added to it. We're now at 59 or .059 gallons. If we hit the reset key it drops to zero.

Thank you very much. My name is Carl Schoenherr. If you have any questions whatsoever contact Gems Sensors 1-800-378-1600.