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Silver Instruments Oval Gear Flow Meter: Programming Electronic Gear Transmitters
Quick Answer
For engineers who need to program an electronic gear transmitter on an oval gear flow meter, Silver Instruments delivers a straightforward setup. The transmitter accepts a 4-20 mA output with HART protocol, configurable pulse scaling, and a local LCD display. You can set the K factor directly on the amplifier PCB or via the SIL-HHT handheld programmer. Just provide your pipe size (DN), fluid viscosity (cP), and flow range (L/min or kg/h), and we will pre-program the unit before shipment.
Why Electronic Gear Transmitters Matter on Your Flow Meter
An oval gear meter by itself generates raw gear rotations. The electronic gear transmitter converts those rotations into a calibrated pulse output or a 4-20 mA loop signal. Without proper programming, your DCS or PLC reads wrong totalizer values. Silver Instruments designs the SIL OG series oval gear meters with a modular transmitter head so you can change the electronics without removing the pipe connection. This saves downtime in a chemical dosing line or a fuel oil blending skid. The transmitter housing is rated IP67. It works from DN10 up to DN200 pipe sizes. Typical measuring accuracy stays within plus or minus 0.5 percent of reading when the K factor is correctly programmed. Common fluid examples include diesel (viscosity 3 to 6 cP at 25 degrees C), heavy fuel oil (up to 380 cSt at 50 degrees C), and water-glycol mixtures. For most applications, the default signal type is open collector pulse. But you can request a two-wire 4-20 mA HART variant if your control room uses analog input cards.
Programming Parameters You Need to Know
Most engineers skip this part and then call support. Here is what you should write down before touching any DIP switch or handheld programmer. First, your real flow range. Example: 2 to 20 liters per minute for a light fuel oil transfer pump. Second, the K factor of your specific flow meter. Every Silver Instruments oval gear meter ships with a calibration certificate that lists the K factor in pulses per liter. A typical DN25 meter shows about 320 pulses per liter for clean diesel. Third, the output load resistance if you use the 4-20 mA option. The loop must stay below 500 ohms at 24 V DC supply. Fourth, the frequency cut-off for low flow noise rejection. In practice, set this at 0.5 Hz for most small bore meters. Fifth, the display units on the local LCD. You can choose liters, gallons, kilograms, or pounds. Silver Instruments pre-configures the unit to liters as default.
Step-by-Step Programming Guide
This procedure applies to the SIL-TX-100 electronic gear transmitter used on SIL OG series meters. Before you start, isolate the meter from the process and relieve any residual pressure. Remove the four M4 screws on the aluminium lid and gently tilt the lid away from the housing. You will see the amplifier PCB with a 4-pin HART interface terminal block, three push buttons (MODE, UP, DOWN), and an 8-pole DIP switch block.
Step 1. Set the DIP switch 1 to ON if you want pulse output, or OFF for 4-20 mA analog output. Step 2. Connect the SIL-HHT handheld programmer to the 4-pin HART port using the blue adaptor cable. Do not loop-wire to the terminal strip at this stage. Step 3. The LCD will blink PROGRAM. Press MODE once to enter the K factor menu. Step 4. Use UP and DOWN to scroll to the exact K factor from your calibration sheet. A DN20 diesel meter might show 618 pulses per liter. Hold MODE for 3 seconds to save. Step 5. Move to the FLOW UNIT menu and select your engineering unit. Step 6. Set the PULSE SCALING factor if your PLC counter input cannot handle frequencies above 1 kHz. Example: Set divider to 10 for a clean 61.8 pulses per liter instead of 618. Step 7. Exit the programming mode, disconnect the HART handheld, and replace the
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After commissioning, we recommend a gravimetric or master meter validation run. A paint manufacturer in Vietnam ran a 10-minute test with 30 liter batches and compared the transmitter total against a weigh scale. The deviation was less than 0.3 percent after proper K factor adjustment. Similarly, a diesel generator testing facility in Saudi Arabia reduced fuel consumption measurement errors from 1.2 percent to 0.4 percent by simply correcting the pulse scaling divider.
When You Need Pre-Programmed Transmitters
Many distributors and EPC contractors prefer to receive the flow meter with the transmitter already programmed. Silver Instruments offers this at no extra charge during order. Send us your pressure (bar), temperature (degrees C), pipe size (DN), and flow range, and we will load the correct parameters before final calibration. You just mount the meter and wire it. This eliminates field programming errors and reduces commissioning time. Contact our application team:
Tel: +86-135-1213-1526
Whatsapp: 86-135-12131526
WeChat: +86 13512131526
Common Issues We See on Customer Sites
One frequent mistake is selecting the wrong K factor unit. Some calibration sheets print pulses per US gallon, but the transmitter expects pulses per litre. Always check the unit before entering the value. Another issue appears with high-viscosity fluids above 1,000 cP. When the RPM of the oval gears drops below 2 Hz, the transmitter may interpret the slow pulse train as a fault and trigger the low-flow alarm. In these cases, adjust the low-flow cut-off threshold in the advanced menu. A chocolate syrup batch line in Malaysia saw intermittent zero readings until the cut-off was lowered to 0.2 Hz. Also, if you run a long cable between the transmitter and the PLC, keep the pulse output cable away from VFD motor cables. A 50 metre unshielded cable run in a UAE water treatment plant picked up enough noise to double the pulse count. We solved it by specifying a twisted pair shielded cable and setting the edge sensitivity to negative edge trigger inside the transmitter menu.
FAQ about Programming Electronic Gear Transmitters
Can I program the transmitter without the handheld programmer? Yes. The three push buttons on the PCB allow direct menu navigation. The process is slower but fully functional.
What if I lose the calibration sheet with the K factor? Every Silver Instruments meter has a serial number engraved on the body. Send us that serial number via WhatsApp, and we will email the original calibration PDF within one working day.
Does the transmitter support HART revision 7? The current firmware supports HART 7 with multi-drop capability. You can address up to 15 devices on a single loop.
Is the transmitter ATEX certified? The standard enclosure meets ATEX Zone 2 (II 3G Ex nA IIC T4 Gc). For Zone 1 requirements, we offer an intrinsically safe variant with an external safety barrier. Ask our team for the certificate when you request a quote.
How do I reset the transmitter to factory defaults? Power off the unit. Press and hold the MODE button while reapplying power until the LCD shows RESET. Release the button. The transmitter will reload the calibration defaults stored in the EEPROM.
For technical support or a personalized programming guide for your application, reach our team at Tel: +86-135-1213-1526, Whatsapp: 86-135-12131526, or WeChat: +86 13512131526. We ship pre-programmed oval gear flow meters from our warehouse to Southeast Asia, Oceania, Latin America, Africa, and the Middle East.