High-Temperature Oval Gear Flow Meter
Hot-Oil and Asphalt to +200 °C pointer / +150 °C LCD
±0.5 % of rate base, ±0.2 % of rate precision grade
DN10 to DN200, PN1.0 to PN6.3 MPa, viscosity 0.6 to 2000 mPa·s
Pointer build to +200 °C; LCD electronic build to +150 °C
- Hot lube oil, asphalt and bitumen, warmed heavy fuel oil, hot resin, and heat-transfer oil; liquid only, no straight-pipe requirement
- Thermal-extension pipe (100 mm or 160 mm) carries the counter, pulse transmitter, or LCD head above the hot body for ambient electronics
- U-suffix steam jacket on the body shell for asphalt service; jacket-side spec by quote
- Out of scope: hot steam (go to vortex), service above +200 °C (go to Coriolis), and ±0.1 % custody (go to Coriolis)
High-temperature oval-gear body
with thermal-extension pipe
and finned heat-dissipation barrel
Product photo on request
with thermal-extension pipe
and finned heat-dissipation barrel
Product photo on request
Cast-iron or cast-steel high-T body · pointer or LCD head
Thermal-extension 100 mm (DN15-DN50 light) / 160 mm (DN50 heavy and larger)
The LC-T series; LC-TA (thermal-extension pipe) and LC-TE (electric heat-trace) body codes; handles hot lube, asphalt, warmed HFO, hot resin, and heat-transfer oil to +200 °C on the pointer build and +150 °C on the LCD build. The thermal-extension pipe lifts the readout into ambient air. DN10 to DN200, PN1.0 to PN6.3 MPa, 0.6 to 2000 mPa·s. Diesel wet-cal per JJG 667-2010. Optional U-suffix steam jacket (LC-UTA / LC-UTE). Ships 5 to 7 business days.
Benefits
- +200 °C pointer / +150 °C LCD: hot lube at 80 to 200 °C, asphalt 150 to 200 °C, warmed HFO 30 to 380 cSt; LCD is the tighter ceiling.
- Thermal-extension pipe: 100 mm on DN15 to DN50 light bodies, 160 mm on DN50 heavy and larger; keeps the readout out of the hot zone.
- No straight-pipe requirement: volumetric chamber-displacement physics measures volume directly; the only series on the site with zero D upstream.
- Viscosity 0.6 to 2000 mPa·s: four flow-range grade cover light fuel, mid lube, high-viscosity HFO, and very-high-viscosity asphalt.
- U-suffix steam jacket: jacket on the body shell keeps asphalt and hot resin liquid; jacket steam never enters the displacement chamber.
- JJG 667-2010 cal, 5 to 7 day lead: diesel-oil K-factor on the data plate, ISO 9001 cert, factory-direct.
Configure your build.
Pick DN, body material, working pressure, accuracy grade, output, and the steam-jacket option. The configurator returns the PF-OG-LCT model code and a ballpark unit price; engineering replies with the wet-flow-calibrated K-factor and the bypass-loop drawing within one business day.
Your Configuration
PF-OG-LCT-TA-25-1.6-S-A-N
DN25, cast iron, PN1.6 MPa, ±0.5 % of rate, pointer + 6-roller cumulative, mechanical only.
Estimated unit price
Verified after engineering review
$680
✓ JJG 667-2010 wet-flow calibration
✓ ISO 9001 cert + mill cert by heat number
✓ Reply within 4 business hours
✓ ISO 9001 cert + mill cert by heat number
✓ Reply within 4 business hours
Typical applications
Four applications where this is the right pick.
🏗
Asphalt batch plant and bitumen tank farm
Hot bitumen at 150 to 200 °C, 200 to 500 mPa·s. The U-suffix jacket keeps product liquid on the truck rack.
⛽
Refinery hot-oil and warmed-HFO bunker billing
Bunker fuel and IFO 180 / 380 at terminal temperature, 30 to 380 cSt. Honest ±0.5 % of rate next to Coriolis.
⚡
Heat-transfer oil and thermal-fluid skid
Therminol or Dowtherm on a closed loop at 150 to 200 °C. The extension pipe holds the readout in ambient air.
🪨
Hot resin, hot coatings, and coke-by-product oil
Resin and coatings warmed to flow, plus coke-byproduct oil in service. The jacket prevents cold-spot freeze on the line.
Specifications
| Measurement principle | Volumetric positive-displacement; two interlocking oval rotors meter 4 × crescent-cavity volume per rotor revolution; no Reynolds-number dependence, no straight-pipe requirement, viscosity-tolerant within the design limits |
|---|---|
| Reference standards | JJG 667-2010 (China national metrological verification regulation for liquid volumetric flow meters; the factory diesel-oil wet calibration standard); design conventions referenced in API MPMS Chapter 5.2 custody practice (custody accreditation is buyer-arranged with a notified body, not ex-factory) |
| Pipe size | DN10, DN15, DN20, DN25, DN40, DN50, DN65, DN80 (light type), DN80 (heavy type), DN100, DN150, DN200 |
| Model code | LC-T series; LC-TA (cast iron with thermal-extension pipe), LC-TE (cast steel with electric heat-trace), or 316 stainless TB body; append U for the steam-jacket body shell (asphalt, hot resin) and −J (the −J suffix marks the ±0.2 % precision grade). Full build per the §XIV selection matrix (e.g. LC-TA50.2/A1-GF-I = LC-TA cast iron, DN50, PN1.6 MPa, A1 counter + signal-out, GF-I 12 V pulse; LC-UTA50.2/A1-GF-I adds the steam jacket) |
| Working pressure | Cast iron: PN1.0 / 1.6 MPa · Cast steel: PN1.6 / 2.5 / 4.0 / 6.3 MPa · 316 stainless: PN1.6 / 2.5 / 4.0 / 6.3 MPa |
| Medium temperature; pointer build | −20 to +200 °C on the mechanical pointer build with thermal-extension pipe |
| Medium temperature; LCD electronic build | −20 to +150 °C on the LCD electronic build; the LCD ceiling is the tighter ceiling because the electronics live in closer thermal coupling to the displacement chamber than the mechanical pointer |
| Accuracy | ±0.5 % of rate (standard accuracy grade); ±0.2 % of rate (precision grade, suffix J) within the published flow-range grade per DN and viscosity |
| Repeatability | ±0.05 to ±0.1 % typical on a freshly calibrated meter (engineering estimate; clearance-stability dominated; the build does not list a separate repeatability row) |
| Viscosity range | 0.6 to 2000 mPa·s; four published flow-range grade: 0.6-2 mPa·s light-viscosity, 2-200 mPa·s mid-viscosity, 200-1000 mPa·s high-viscosity, 1000-2000 mPa·s very-high-viscosity |
| Turndown | 1:10 per body per viscosity range on the standard accuracy grade; 1:5 on the precision grade at certain DN and viscosity combinations |
| Wetted material | Cast iron (TA) for petroleum and non-corrosive oils; cast steel (TE) for higher-pressure refined fuel and warmed-HFO service; 316 stainless (TB) for hot resin and corrosive hot chemical service. Rotors run iron-on-iron or stainless-on-stainless to match the body. |
| Thermal-extension pipe | 100 mm extension on DN15 to DN50 light bodies; 160 mm extension on DN50 heavy and larger; the extension carries the counter, pulse transmitter, or LCD head above the hot body for an ambient electronics zone |
| Steam-jacket option | U-suffix steam jacket on the body shell; keeps the medium liquid through the meter on asphalt and resin service; jacket steam never passes through the displacement chamber; maximum jacket pressure, port size, and jacket medium (steam, heat-transfer oil, hot water) are specified at quote |
| Counter / display | A (pointer + 6-roller cumulative, passive) / A1 (pointer + cumulative + signal-output capable) / Z (pointer + zero-return single-shift counter) / J1 (heavy-body pointer with signal output) / ELZ (LCD electronic head, instantaneous + cumulative, +150 °C cap) |
| Output signal | None (mechanical pointer, passive); GF-I 3-wire pulse 12 V; GF-II 3-wire pulse 24 V; MF 4-20 mA two- or three-wire; RS-485 Modbus RTU on the LCD electronic build |
| Power supply | None on mechanical pointer (passive); DC12V on GF-I and two-wire MF; DC24V on GF-II and three-wire MF; LCD electronic head DC12 to DC24V external |
| Hazardous-area | Ex d IIBT4 housing on the pulse transmitter or LCD electronic head; the mechanical-only pointer build is passive and requires no Ex certification; the cleanest hazardous-area choice in this range |
| Ingress protection | IP65 typical on the electronic head; mechanical pointer is enclosed cast-body construction rated for outdoor service |
| Connection | Flange JB/T79~82-1994 standard (equivalent to HG/T 20592 at PN1.6 / 2.5 / 4.0 / 6.3 MPa); ANSI 150 / 300 / 600 lb supplied to order |
| Ambient temperature | −10 to +60 °C around the electronic head; the hot body radiates; allow clearance for natural-air convection above the thermal-extension pipe |
| Applicable media | Hot lube oil and gear oil at 80 to 200 °C; asphalt and bitumen at 150 to 200 °C warmed to 200-500 mPa·s; warmed heavy fuel oil (HFO / IFO 180 / IFO 380) at 30 to 380 cSt in-service; hot resin and hot coatings; coke-by-product oil at warmed in-service viscosity; heat-transfer oil (Therminol / Dowtherm) at operating temperature. Liquid only, single-phase, no entrained gas. |
| Out of scope | Hot saturated and superheated steam (go to vortex); gas and two-phase flow (go to gas series); service above +200 °C (go to Coriolis, mass-direct to +350 °C); custody requiring ±0.1 % of rate (go to Coriolis); abrasive-particulate-laden flow (jams rotors); pulsating flow without an upstream accumulator |
| Calibration | Diesel-oil wet-flow calibration on the factory loop per JJG 667-2010; ISO 9001 calibration certificate ships with each meter; water calibration is explicitly forbidden on cast-iron and cast-steel bodies because water induces oval-wheel rust |
| Lead time | 5 to 7 business days from factory |
Installation
Five field rules for a long-life hot-service install on an oval-gear positive-displacement meter.
- Upstream filter mandatory; gas-elimination filter if entrained gas possible 100 µm mesh on petroleum, finer on chemical-dosing. Air pockets over-register; gas displaces chamber volume the same as liquid.
- Rotor shaft horizontal regardless of pipe orientation Off-horizontal mount causes asymmetric bearing wear and K-factor drift within the first thousand hours of service.
- Bypass loop required on continuous 24/7 service Bypass with isolation valves above and below the meter for maintenance access. On asphalt and warmed-HFO service the bypass should be steam-traced to match the main line.
- Throttle INLET, on-off OUTLET; open the inlet slowly Water-hammer is the number-one cause of rotor damage on a PD meter. Never snap-open a valve upstream of the meter at full line pressure.
- U-suffix steam jacket on asphalt service; never steam-clean the chamber Jacket steam circulates outside the displacement chamber. Running steam through the chamber thermal-shocks bearings and clearance tolerances.
Frequently asked questions
What is the honest temperature ceiling, and what is the delta between the pointer build and the LCD electronic build?+
The pointer build runs −20 to +200 °C on the displacement chamber. The LCD electronic build runs −20 to +150 °C. The 50 °C delta is honest, documented, and structural: the LCD electronics live in closer thermal coupling to the chamber than the mechanical pointer, so the LCD ceiling is the tighter ceiling. Both builds use the same thermal-extension pipe (100 mm on DN15-DN50 light, 160 mm on DN50 heavy and larger) to carry the head into ambient air. For service above +200 °C route the inquiry to a Coriolis mass-flow meter (rated to +350 °C standard).
Will this meter measure warmed heavy fuel oil at bunker terminal viscosity, and how does it position against a premium custody oval-gear?+
Yes; warmed HFO / IFO 180 / IFO 380 at terminal in-service temperature is the canonical high-temperature oval-gear service. The range includes a dedicated high-viscosity flow-range table (200-1000 and 1000-2000 mPa·s) on DN10-DN200 that covers the entire warmed-HFO range. Accuracy ±0.5 % of rate standard, ±0.2 % of rate precision (J suffix). For ±0.1 % of rate custody, go to Coriolis.
What cert ships with the meter, and what is the lead time?+
Lead time is 5 to 7 business days from the factory. Each meter ships with a diesel-oil wet-flow calibration certificate per JJG 667-2010 (the China national metrological verification regulation for liquid volumetric flow meters), an ISO 9001 calibration certificate, a mill certificate traceable to heat number on the wetted material, and the Ex d IIBT4 housing certification on the pulse transmitter or LCD electronic head where the buyer specifies the electronic output. The factory does not ship API MPMS Chapter 5.2 custody-transfer accreditation, OIML R 117, MID MI-005, GB/T 30491, ATEX, IECEx, FM, CSA, or 3-A dairy listing; design conventions reference the API and OIML practice for volumetric PD flow measurement, but custody-transfer accreditation is buyer-arranged with a notified body for the project jurisdiction. Water calibration is explicitly forbidden on cast-iron and cast-steel bodies because water induces oval-wheel rust; the diesel-oil wet calibration is the factory-published verification.
Need a high-temperature oval-gear on a hot-oil, asphalt, or warmed-HFO line?
Send medium, temperature, viscosity, DN, pressure, min/normal/max flow, and jacket need. Engineering returns a wet-flow-calibrated quote in one business day.