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Lubricating Oil Flow Meter 100 L/h for Bearing Protection Systems
Quick Answer: A 100 L/h lubricating oil flow meter protects bearings in large pumps and compressors. Engineers choose positive displacement meters like oval gear or helical gear types because lube oil viscosity changes with temperature. Silver Automation Instruments supplies compact meters with local display, 4-20 mA output, and even ATEX Zone 1 certification. The meter body handles flows from 10 L/h to 600 L/h on a DN15 line without skipping pulses at low flow.
We recently shipped ten OM-15 oval gear meters to a diesel power plant in Mindanao, Philippines. Their bearing lube system ran at 2.5 bar with ISO VG 68 oil at 40 degrees C. The site needed a meter that would not stall at 15 percent of full scale. Standard turbine meters failed there. The oval gear design trapped a fixed volume per pocket and kept the 4-20 mA signal clean all the way down to 12 L/h. That is what bearing protection demands, a repeatable pulse even during warm-up cycles.
Why a Dedicated 100 L/h Lubricating Oil Flow Meter Matters
Bearing protection is not about totalizing batch volume. It is about confirming constant oil supply. When a thrust bearing on a large fan loses lube flow for 20 seconds, the damage cost runs into five figures. Operators in steel mills and gas compression stations look for a meter that gives update rates faster than 200 ms. They also do not want a meter that clogs on varnish or gets stuck when the oil is cold.
In practice, that means you skip Coriolis for this job. A Coriolis meter introduces a pressure drop that a low pressure lube skid cannot handle. Ultrasonic clamp-on meters struggle with small DN10 or DN15 lines and heavy damping from thick oil. Magnetic meters cannot read insulating lube oil. Here is the thing: positive displacement meters remain the default choice across oil and gas sites in the Middle East, mining operations in Chile, and edible oil plants in Indonesia. That is what we see on distributor reports month after month.
Silver Instruments OM-15 Oval Gear Flow Meter Specs for 100 L/h Lube Oil
The OM-15 is a small body oval gear flow meter designed for hydraulic and lube oil circuits. Its measuring range covers 12 to 600 L/h with an accuracy band of plus minus 0.5 percent of reading for viscosities above 20 cP. The standard housing is 316L stainless steel with PEEK gears and a ceramic bearing set. We offer a PTFE seal option for high temperature lube circuits running up to 150 degrees C. The process connection is DN15 threaded (G1/2 or NPT 1/2) so it fits directly into a skid piping spool.
Most bearing protection panels we build in Australia and export to Southeast Asia add a local indicator with a 4-20 mA HART output. You can integrate the meter directly into a Bently Nevada or PLC-based trip system. If the lube flow drops below a set point, say 80 L/h, the meter triggers an alarm within two seconds. The signal refresh rate on the OM-15 is configurable from 50 ms to 500 ms. For ATEX Zone 1 sites, we supply an Ex ia IIC T4 certified version. This unit is dust tight and water jet resistant with an IP67 rating.
One detail most engineers skip: the meter needs a small straight run. Because oval gear meters displace a fixed volume, they do not require 10D upstream like a vortex meter. A simple Y strainer 200 micron mesh before the inlet solves the majority of field issues. We learned this on a customer site in Vietnam last year. Their lube oil system picked up pipe scale from a new installation. The meter jammed after three days. A strainer fixed it permanently without recalibration.
Field Wiring and Output Configuration
The OM-15 ships with a 10 point terminal block inside a cast aluminum junction box. Terminals 1 and 2 provide 24 V DC power. Terminals 3 and 4 carry the active 4-20 mA HART loop. You also get a passive pulse output on terminals 5 and 6 for direct connection to a PLC counter card. The flow computer built into the LCD display supports scaling, damping, and low flow cut-off.
For sites without 24 V DC bus, Silver Instruments can supply a loop powered version with a battery pack or a solar powered remote display. We have deployed this on remote wellhead compressors in Oman where the bearing oil skid sits 500 meters from the nearest MCC. The meter loops back to a wireless Hart modem and sends flow data to the DCS every 15 seconds.
How This Meter Protects Your Bearings in Real Time
The bearing damage curve is non-linear. A hydrodynamic bearing running at 3000 rpm seizes within a minute of flow interruption. The OM-15 meter output rides a 4-20 mA signal directly proportional to flow rate. You program a low-flow trip in the PLC at, for example, 70 L/h. As soon as the flow goes below that threshold for more than three seconds, the logic de-energizes the main motor contactor. That is the simplest possible interlock. No flow computer needed. The 4-20 mA loop passes right into the analog input card of any Siemens, Allen Bradley, or Mitsubishi PLC.
We also recommend using the HART diagnostic bits to monitor the meter health. The HART secondary channel reports pick-up fault, reversed flow, and empty pipe conditions. A maintenance team in a LNG facility in Malaysia used this feature to spot a sticking gear before it caused a bearing failure. The meter sent a fault alert three days before scheduled shutdown. They cleaned the meter in two hours and avoided a production loss of 12 hours.
Direct Replacement for Existing Lube Oil Meters
Many OEM bearing protection panels originally installed a German or Japanese meter. Getting a replacement from them can take 12 weeks and cost three times the Silver Instruments price. The OM-15 matches the footprint of common KEM Kuppers or Oval Corp meters. The process connection sizes align. The K-factor range from 500 to 3000 pulses per liter can be set to match your existing PLC logic. Do not rewire the entire panel when the only failure is a worn out bearing inside the old meter.
Send us your application details for a quote: Tell us your lube oil type, viscosity at operating temperature (cP), normal flow rate in L/h, maximum pressure (bar), temperature (degrees C), pipe connection size (DN or inches), and whether you need ATEX or IECEx certification. Our application engineers will reply within one working day with a 100 L/h lubricating oil flow meter spec sheet and a fixed price. See the OM series product page at flow-meter.com.au for full dimensional drawings and material certificates.
FAQ
Q: Can the OM-15 meter handle ISO VG 320 gear oil at cold start? The meter works down to 1000 cP with standard PEEK gears. If your start-up viscosity exceeds 2000 cP, we supply a larger clearance gear set. Mention the cold viscosity when you send your inquiry.
Q: What is the pressure drop at 100 L/h? With ISO VG 68 oil at 40 degrees C, pressure drop across the OM-15 is less than 0.1 bar at 100 L/h. This keeps the lube pump discharge pressure well within the bearing supply requirement.
Q: Does this meter need a separate flow computer to trip the pump? No. The 4-20 mA analog output goes directly into your PLC analog input. You set the low flow trip threshold in the PLC program. The unit also has a local alarm output transistor that can drive a small relay directly.
Q: How do you calibrate the meter for bearing protection service? Every OM-15 leaves our factory with a 5 point calibration on an ISO 17025 accredited rig using a reference oil matching your stated viscosity. We provide a certificate with each meter at no extra charge.
Q: Can I use this meter on a turbine lube oil system with a 200 L/h normal flow? Yes, the OM-15 spans up to 600 L/h. We will set the 4 mA point at 0 L/h and the 20 mA point at 250 L/h so you get high resolution around the normal operating range. Tell us your maximum expected flow during commissioning.