More often that not, when a customer purchases an FM-1D/K Frequency to Current Converter, I can typically expect a phone call within a week or so of the shipment. Most of those calls start with an experienced, but terribly confused technician who has just finished reading the Installation Manual and is in dire need of little programming help.
With that phone call in mind, I’ve written the following tutorial to hopefully add a little content to the factory manual.
Meinecke Turbine Flow Meters are available in sizes ranging from 1-1/2″ to 12″. Cold Water Meters are rated to a maximum temperature of 122’F, Hot Water Meters are rated to 256’F. Even though this is a mechanical meter at its core, output options are available. When used with a remote totalizer, Reed Pulsers are available, but for the purposes of this post, we’re going to concentrate on the “other” output.
Opto Pulsers & the FM-1D/K Frequency to Current Converter
For a remote indication of flow rate, consider using an Opto Pulser and and FM-1D/K Transmitter, otherwise known as a “Frequency to Current Converter”. In it’s simplest terms, Opto Pulsers shine an infrared light on a star shaped, reflective wheel within the register.
With flow, the wheel spins and the pulser counts the reflections coming back at it from the wheel. That count, also referred to as a “Frequency” is reported to the FM-1D/K and then “converted” to 0-20 or 4-20mA output. For your convenience, there is also a display of flow rate located on the transmitter.
Different size meters, as well as those designed for measuring Cold or Hot Water have different Pulse Values. In this tutuorial, I’ve used a 3 inch cold water meter as an example, but pulse values for all meters sizes and types are included at the end of this article.
How to Buy a Flow Meter
Flow meters come in different styles, technologies, abilities, etc. No one meter that can do everything – but they all have their purpose. Before you can buy with confidence, learn what questions must be answered!
Looking beyond the factory manual…
I’m assuming you’ve read the Operations/Maintenance manual that came with your transmitter at this point. If not, this would be a good time to do that. Click Here to download a PDF copy if needed. Once the unit has been connected and powered up, go to Section 4, “Calibration by Hand”.
In this instance, we are programming the FM-1D/K for use with a 3 inch cold water meter and a Model OD-03 Opto Pulser.
Water Meter: 828601 3″ Cold Water Meter
Pulser: Type: OD-03
Current Output: 0-20mA or 4-20mA
Flow Rate: 3.5 to 528 GPM
Pulse Output: 1 pulse = 1 US Gallon
Step 1: Flow Range – The Maximum Continuous Flow for this meter is 528 GPM. When turning the unit on for the first time, the display should show “0000”. Press + or – to enter the programming mode and then adjust the digits (starting at the left) using the + or – buttons to match the maximum flow. If you want the output to reflect the full range of a 3″ meter, we suggest you change it to 0550. This gives you a possible flow range of 0 to 550 GPM which is just slightly more than the rated 528 gpm.
Step 2: Counter Reading – The purpose here is to sync the actual meter reading with the FM1-D/K display. If this isn’t important to you, skip this step. Using the Upper and Lower Status lights as directed, set each digit to match the reading on your flow meter. Don’t forget that the full eight digit readout includes the last two or three digits indicated by the red tip of the dial.
Step 3: Pulser Input – The pulse value for the OD-03 on a 3 inch meter is 1 pulse = 1 gallon so you will need to set this to 0001. Also, on the input value, the signal mode should be set to InPb. It shouldn’t make a difference if it’s not, but the correct setting is InPb. This setting tells the unit that the OD-** pulser is only capable of detecting flow in one direction only.
Step 4: Pulse Output – This reading is used for two purposes, the integral display and the pulse output to a remote totalizer (if used). When configuring this setting, it needs to be equal to or greater than the input value. In this application with an input value of 0001, the setting needs to be 0001 or greater.
Step 5: Output Setting – This setting allows you to choose between 0-20mA or 4-20mA. Toggle between them with the +/- buttons and use the “Select” button to make your choice.
Step 6: Damping – This setting determines the response time of the current output and flowrate indicator. Damping ranges from 1 (No Damping) to 14 (Maximum Damping). If there are no special requirements, the factory recommends a damping of “0004” for most applications.
Section #5 – Protection
Settings to the FM-1D/K can be protected against unintentional changes by using this feature. Once the programing has been completed, tested and the unit is ready for use, press both the + and – buttons simutaneously to toggle back and forth between the Programming and Protected Modes. In the Protected Mode, the settings are still visable, but cannot be changed.
Display: “LOC 6” = Device in Programming mode
Display: “LOC 8” = Device Protected
Follow the mfg’s recommendations/instructions as needed.
Section #6 is the Test Mode
Follow the mfg’s instructions to test your settings. The +/- buttons are used to scroll through the test modes.
Section #7 – Standard Mode
The Standard Mode is the default mode when all adjustments and programming are completed and the meter is ready for use.
- Rapid Flashing of all Status LED’s indicates incoming pulses;
- The permanently illuminated Status LED indicates the measuring units on the display;
- In the Standard Mode, the display offers the following information by toggling:
- Flowrate Indication – Reverse Flow is indicated by “-000”
- Counter Reading – First Four Digits
- Counter Reading – Last Four Digits
- Pulse Value – Input Setting
- Pulse Value – Output Setting
- Current Output Setting (0-20mA or 4-20mA)
- Damping Setting
- Firmware Revision
Section #8 – Lighting Protection
This section is self-explanatory. Follow the manufacturer’s instructions.
Section #9 – Trouble Shooting
This section is self-explanatory. Use the information found in this section as needed to troubleshoot individual problems with your unit.
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