OVAL GEAR METERS – 1/2" TO 2" THREADED
SERIES GPI-OM Oval Gear Meters - 1/2” to 2” Threaded 
Meter Type
Positive Displacement (PD) Flow Meter designed to measure the flow of most fluids including high and varying viscosities without requiring recalibration.
How It Works
Positive Displacement Flow Meters measure the volumetric flow of fluids in pipes. As fluid flows through the chamber the oval gears rotate. Each rotation corresponds with a fixed volume of fluid that is picked up by a sensor creating a pulse signal. Electronic displays convert the pulse signal to a flow rate or totals.
Standard Features
- High accuracy and repeatability, direct volumetric reading
- No calibration required
- Measures low and high viscosity liquids up to 1,000cps
- Pressure rated up to 5800 PSIG
- No straight pipe runs required up or downstream
- Stainless Steel, Aluminum, and PPS
- Bi-directional flow measurement
- Factory Calibration Certificate supplied with each meter
- 1 Year Limited Warranty
Optional Features
- Measures up to 1,000,000cps
- Quadrature pulse output option for high resolution
- PF option for metering pulsating flows
- Optional Exd I/IIB Approval (ATEX, IECEx)
LCD Display Features
- Rate of Flow, 2 Totals (1 Resettable Batch, 1 Cumulative)
- User Configurable to GPM, LPM or any Unit of Measure
- Factory Calibrated for 1.0 Specific Gravity
- Field Calibratable for fluids greater than 1.0 Specific Gravity
- Digital Display with 6 Digits Starting at 0.01 (floating decimal)
- Totals Maximum of 99,999,999
- Powered by 3.6V Battery (approximate 3 Year life, for display only) or may be externally powered
Electronic Options
- Local or Remote LCD (see below features)
- Pulse Output (Open Collector NPN)
- 4-20mA Outputs
- Scaled Pulse Output
- Alarms or Batch Controlling
| Connection Sizes | ||||
|---|---|---|---|---|
| 1/2" (OM015) | 1" (OM025) | 1½" (OM040) | 2" (OM050) | |
| FLOW RANGES* | 0.26 - 10.6 GPM (1 - 40 LPM) | 2.6 - 40 GPM (10- 150 LPM) | 4 - 68 GPM (15- 250 LPM) | 8 - 120 GPM (30- 450 LPM) |
| ACCURACY (Of Reading @ 3cps - 1000cps) | ||||
| Standard | ± 0.5% | ± 0.5% | ± 0.5% | ± 0.5% |
| With RT14 Display w/ non-linearity correction | ± 0.2% | ± 0.2% | ± 0.2% | ± 0.2% |
| REPEATABILITY (Typical) | ± 0.03% | ± 0.03% | ± 0.03% | ± 0.03% |
| PRESSURE RATINGS | ||||
| Aluminum Meter (A) | 990 PSIG (68 Bar) | 990 PSIG (68 Bar) | 435 PSIG (30 Bar) | 285 PSIG (20 Bar) |
| Aluminum Meter - Intermediate Pressure (M) | - | 2000 PSIG (138 Bar) | - | - |
| Stainless Steel Meter (S) | 990 PSIG (68 Bar) | 990 PSIG (68 Bar) | 435 PSIG (30 Bar) | 550 PSIG (38 Bar) |
| Stainless Steel Meter - Intermediate Pressure (N) | 1450 PSIG (100 Bar) | 1450 PSIG (100 Bar) | 725 PSIG (50 Bar) | 725 PSIG (50 Bar) |
| Stainless Steel Meter - High Pressure (H) | 5800 PSIG (400 Bar) | 5800 PSIG (400 Bar) | 5800 PSIG (400 Bar) | 4350 PSIG (400 Bar) |
| PPS (P) | - | 70 PSIG (5 Bar) | - | - |
| Mechanical Stainless & Aluminum Meters (M4) | 580 PSIG (40 Bar) | 580 PSIG (40 Bar) | 435 PSIG (40 Bar) | 285 PSIG (40 Bar) |
| TEMPERATURE RATINGS | ||||
| Meters with Pulse Out Only | -4 to 250°F (-20 to 120°C) | -4 to 250°F (-20 to 120°C) | -4 to 250°F (-20 to 120°C) | -4 to 250°F (-20 to 120°C) |
| Meters with LCD Display Only | 14 to 140°F (-10 to 60°C) | 14 to 140°F (-10 to 60°C) | 14 to 140°F (-10 to 60°C) | 14 to 140°F (-10 to 60°C) |
| Meters with LCD Display & 4-20mA Output | 32 to 140°F (0 to 60°C) | 32 to 140°F (0 to 60°C) | 32 to 140°F (0 to 60°C) | 32 to 140°F (0 to 60°C) |
| Meters with Mechanical Totalizer | 176°F (80°C) | 176°F (80°C) | 176°F (80°C) | 176°F (80°C) |
| PPS Meters with Pulse Out Only | 176°F (80°C) | 176°F (80°C) | 176°F (80°C) | 176°F (80°C) |
| VISCOSITY | ||||
| Standard Unit Ranges | 3 - 1,000 cps | 3 - 1,000 cps | 3 - 1,000 cps | 3 - 1,000 cps |
| Low Viscosities below 3cps | Contact Us | Contact Us | Contact Us | Contact Us |
| High Viscosity Ranges | 1,000 - 1,000,000 cps | 1,000 - 1,000,000 cps | 1,000 - 1,000,000 cps | 1,000 - 1,000,000 cps |
| PRESSURE DROP (At Full Std Capacity) | Contact Us | Contact Us | Contact Us | Contact Us |
| RECOMMENDED STRAINER SIZE | 100 Mesh (150 Microns) | 100 Mesh (150 Microns) | 100 Mesh (150 Microns) | 100 Mesh (150 Microns) |
| STRAIGHT PIPE REQUIREMENTS | None | None | None | None |
| OUTPUT PULSE RESOLUTION | Pulses per Gallon (Pulses per Liter) - nominal | |||
| Reed Switch | 318 PPG (84 PPL) | 102 PPG (27 PPL) | 53 PPG (14 PPL) | 25 PPG (6.5 PPL) |
| Hall Effect | 636 PPG (168 PPL) | 405 PPG (107 PPL) | 212 PPG (56 PPL) | 99 PPG (26 PPL) |
| QP-Quadrature Hall Option | 636 PPG (168 PPL) | 203 PPG (53.5 PPL) | 106 PPG (28 PPL) | 49 PPG (13 PPL) |
| SWITCH OUTPUTS | ||||
| Reed Switch Output | 30VDC x 200mA max. [Maximum Thermal Shock 50°F (10°C)/minute] | |||
| Hall Effect Output (NPN) | 3-Wire Open Collector, 5-24VDC Max. 20mA Max. | |||
| Optional Outputs | 4-20mA, Scaled Pulse, Quadrature Pulse, Flow Alarms or Two-Stage Batch Control | |||
| PROTECTION CLASS | IP66/67 (NEMA4X), Optional Exd I / IIB T4/T6, Integral Ancillaries can be supplied I.S. (intrinsically Safe) | |||
| WETTED MATERIALS (Std) | ||||
| Body - Aluminum Meter (A, M) | Aluminum | Aluminum | Aluminum | Aluminum |
| Body - Stainless Steel Meter (S, N) | 316L Stainless Steel | 316L Stainless Steel | 316L Stainless Steel | 316L Stainless Steel |
| Body - Stainless Steel Meter (H) | 316 Stainless Steel | 316 Stainless Steel | 316 Stainless Steel | 316 Stainless Steel |
| Body - PPS Meter (P) | - | PPS | - | - |
| Bearings - Aluminum Meter (A, M) | none | none | none | none |
| Bearings - Stainless Steel Meters (S, N, H) | Carbon Ceramic | Carbon Ceramic | Carbon Ceramic | Carbon Ceramic |
| Bearings - PPS Meter (P) | - | none | - | - |
| Shaft - Aluminum & Stainless Steel Meters | Stainless Steel | Stainless Steel | Stainless Steel | Stainless Steel |
| Shaft - PPS Meter | - | Carbon Ceramic | - | - |
| Rotor - Aluminum & PPS Meters (A, M, P) | PPS | PPS | PPS | PPS |
| Rotor - Stainless Steel Meters (S, N, H) | 316 Stainless Steel | 316 Stainless Steel | 316 Stainless Steel | 316 Stainless Steel |
| Seals - Aluminum & PPS Meters (A, M, P) | FKM (Viton™) | FKM (Viton™) | FKM (Viton™) | FKM (Viton™) |
| Seals - Stainless Steel Meters (S, N, H) | PTFE encapsulated FKM | PTFE encapsulated FKM | PTFE encapsulated FKM | PTFE encapsulated FKM |
| CONN. TO CONN. LENGTH | ||||
| Aluminum Meters | 4.3" (110mm) | 5.4" (137mm) | 7.4" (188mm) | 8.3" (212mm) |
| Stainless Steel Meters | 4.3" (110mm) | 6.9" (176mm) | 7.4" (188mm) | 8.3" (212mm) |
| PPS Meter | - | 4.9" (104mm) | - | - |
*Maximum flow is to be reduced as viscosity increases, see flow de-rating guide. Maximum recommended pressure drop is 15 PSIG (1.03 bar)
Options
- PTFE encapsulated FKM (Viton™) Seals
- Buna-N (Nitrile) Seals (-40°F minimum)
- EPR (Ethylene Propylene Rubber) Seals for keytones (1/2” only)
- High Viscosity SS or PPS Rotors
- Up to 300°F rated
- BSPP (G) Female Connections
- Sanitary Fittings (1/2” size larger than meter size; for standard SS & Aluminum bodies)
- N.I.S.T. Certification
Replacement Parts
- Contact our Sales Dept.
Alternate Meters
- Digital Series: GPI-G2SS, GPI-G2(AL)
- Analog Series: M12(NPT)
Application Notes
- Saturated Steam Service: Not acceptable
- Potable Water: Not acceptable.
- Vacuum Service: Not acceptable
- Gaseous Service: Not acceptable
- General Non-Suitable Services: Liquids with unfiltered solids. Note that deionized (DI) and ultra-pure waters require all stainless steel components and PTFE seals.
- Installation: Limit display’s exposure to sun.
- Corrosion: Before ordering, verify all materials of our flow meters are compatible with the service media(s), intermittently used cleaners, the environment, and cleaning processes in conjunction with the temperatures and pressures of the application(s) and future applications. John C. Ernst Co. does not make chemical compatibility recommendations. Compatibility is the responsibility of the user and/or specifying party.
Model Number Matrix
