(Was Model 300, 301, 302), (Was Model 300W, 301W, 302W)
Meter Type
Differential Pressure Flow/Meter for fluids or gases
How It Works
Measures flow based on pressure differential created across a built-in nozzle
Features
- Large 3-1/2” Analog Dial Display
- Mechanical – requires no power
- Factory calibrated for Liquid or Gas
- Display Head can be mounted to read horizontally left or right of vertical piping or above or below of horizontal piping. (Below is ideal for steam applications.)
Applications
- All 3 body materials are suitable for:
- Water, including Deionized (DI), Demineralized & Distilled Water, Steam, most Oils & Solvents, and many low viscosity fluids
- Compressed Air, Oxygen, Carbon Dioxide and many other non-toxic compressed gases
- Monel is suitable for:
- Sea Water and Brackish Water
- Up to 25% Nitric Acid
- Other acids and alkalines
*Always verify chemical compatibility with the body materials, the seals and all internal wetted parts
Sizes
- 1/4″ to 8″
Detailed Specifications
| Specifications | |
|---|---|
| Dial Display Meters | |
| DISPLAY INFO | |
| Flow Measurements | Rate of Flow |
| Display Size | 3-5/16” Dia. |
| ACCURACY (Full Scale) | ±3% |
| REPEATABILITY (Full Scale) | ±1% |
| PRESSURE | |
| Standard Rating | 180 PSIG (12.4 Bar) |
| Optional Maximum Rating | 400 PSIG (27.5 Bar) |
| Minimum Required | 10 PSIG (0.69 Bar) |
| Standard Calibration for | 100 PSIG (6.9 Bar) |
| TEMPERATURE | |
| Standard Rating | 212°F (100°C) |
| Optional Maximum Rating | 350°F (176°C) |
| Minimum Rating | -30°F (-34°C) |
| Standard Calibration for | 80°F (26°C) |
| PRESSURE DROP | |
| Bronze Meters at Full Scale | 5 PSIG (0.34 Bar) |
| High Pressure Meters (400 PSIG) | 7 PSIG (0.48 Bar) |
| Stainless & Monel Meters at Full Scale | 7 PSIG (0.48 Bar) |
| VISCOSITY | |
| Standard Factory Calibration | < 5cps |
| Optional Factory Calibration Required | Up to 500cps |
| SPECIFIC GRAVITY | |
| Standard Factory Calibration | .95 - 1.05 S.G. |
| Optional Factory Calibration Required | < 0.95 S.G. or > 1.05 S.G. |
| STRAIGHT PIPE REQUIREMENTS | |
| Upstream (Pipe Diameters) | 10 |
| Downstream (Pipe Diameters) | 0 |
Detailed Materials Of Construction
| Materials Of Construction | |||
|---|---|---|---|
| Bronze | 316 Stainless Steel | Monel | |
| WETTED MATERIALS (Standard) | |||
| Body | Bronze | 316 Stainless Steel | Monel |
| Seals | Buna-N | Buna-N | Buna-N |
| Bellows | Bronze | 316 Stainless Steel | Monel |
| Cell Caps | Ryton® | Ryton® | Ryton® |
| WETTED MATERIALS (Optional) | |||
| Seals | Viton®, EPR, TFE | Viton®, EPR, TFE | Viton®, EPR, TFE |
| Bellows | - | - | Inconel® |
| Cell Caps | Bronze, SS | Bronze, SS | Monel |
| NON-WETTED PARTS (Standard) | |||
| Housing | Super ABS UV Stabilized | Super ABS UV Stabilized | Super ABS UV Stabilized |
| Crystal | Polycarbonate | Polycarbonate | Polycarbonate |
| Gear Movement | Bronze | Bronze | Bronze |
| NON-WETTED PARTS (Optional) | |||
| Housing | Epoxy Coated Aluminum | Epoxy Coated Aluminum | Epoxy Coated Aluminum |
| Crystal | Glass (for Aluminum Housing) | Glass (for Aluminum Housing) | Glass (for Aluminum Housing) |
| Gear Movement | - | Stainless Steel | Stainless Steel |
Detailed Standard Max. Flow Rate Scale GPM*
| Size | Standard Max. Flow Rate Scale GPM* | Conn. to Conn. Length | Weight | ||
|---|---|---|---|---|---|
| FNPT | Wafer | FNPT | Wafer | ||
| 1/4” | 2, 3, 4 | 3.06” | 4 Lbs | ||
| 1/2” Low Flow | 4, 6, 10, 15, 20, 30, 40, 60, 100 GPH | 3.06” | 4 Lbs | ||
| 1/2” | 2, 3, 4, 6, 10 | 3.06” | 1.12” | 4 Lbs | 4 Lbs |
| 3/4” | 6, 10, 15, 20 | 3.06” | 1.12” | 4 Lbs | 5 Lbs |
| 1” | 15, 20, 30, 40 | 3.06” | 1.12” | 4 Lbs | 5 Lbs |
| 1-1/2” | 30, 40, 60, 100 | 3.06” | 1.12” | 5 Lbs | 6 Lbs |
| 2” | 40, 60, 100, 150, 200 | 3.19” | 1.12” | 7 Lbs | 7 Lbs |
| 2-1/2” | 60, 100, 150, 200 | 1.12” | 8 Lbs | ||
| 3” | 200, 300, 400, 500 | 4.19” | 1.12” | 12 Lbs | 9 Lbs |
| 4” | 300, 400, 500, 800 | 1.12” | 12 Lbs | ||
| 5” | 300, 400, 500, 800 | 1.12” | 14 Lbs | ||
| 6” | 600, 800, 1000, 2000 | 1.12” | 16 Lbs | ||
| 8” | 600, 1000, 2000, 3000 | 1.12” | 24 Lbs | ||
Detailed Flow Rate Scales
*Optional Flow Rate Scales:
GPH (Liquids), LPH (Liquids), LPM (Liquids), CC/M (Liquids), SCFH (Gases), SCFM (Gases), Nm³/h (Gases), Lbs/Hr (Steam)
Non-Standard Flow Rate Scales are available in up to 3 connection sizes below the standard scale of the connection size.
Please contact our Sales Dept. for pricing and to order.
Low Flow Range Scales
| Standard Low-Flow Range Scales | ||||||
|---|---|---|---|---|---|---|
| Liquid | Gases | |||||
| Scale | Size | GPH | LPH | CC/M | SCFH | Nm³/h |
| 1 | 1/2” | .5 - 4 | 2 - 15 | 30 - 200 | 5 - 40 | .15 - 1 |
| 2 | 1/2” | .5 - 6 | 3 - 20 | 40 - 300 | 5 - 60 | .3 - 2 |
| 3 | 1/2” | 1.5 - 10 | 5 - 40 | 50 - 400 | 15 - 100 | .4 - 3 |
| 4 | 1/2” | 2 - 15 | 5 - 60 | 50 - 600 | 20 - 150 | .5 - 4 |
| 5 | 1/2” | 3 - 20 | 10 - 80 | 150 - 1000 | 30 - 200 | .5 - 6 |
| 6 | 1/2” | 4 - 30 | 15 - 120 | 300 - 2000 | 40 - 300 | 1 - 8 |
| 7 | 1/2” | 5 - 40 | 20 - 150 | 400 - 3000 | 50 - 400 | 1.5 - 10 |
| 8 | 1/2” | 5 - 60 | 30 - 240 | 500 - 4000 | - | - |
| 9 | 1/2” | 15 - 100 | 50 - 400 | 500 - 6000 | - | - |
Standard Flow Range Scales
| Standard Flow Range Scales | ||||||
|---|---|---|---|---|---|---|
| Liquid | Gases | Steam | ||||
| Scale | Size | GPM | LPM | SCFM | Nm³/h | Lbs/Hr |
| A | 1/2" | .3 - 2 | 1 - 8 | 1.5 - 10 | 2 - 15 | 5 - 40 |
| B | 1/2" | .4 - 3 | 1.5 – 10 | 3 - 20 | 4 - 30 | 5 - 60 |
| C | 1/2" | .5 - 4 | 2.0 – 15 | 4 - 30 | 6 - 50 | 10 - 80 |
| D | 1/2" | .5 - 6 | 3 - 25 | 5 - 40 | 10 - 80 | 15 - 120 |
| E | 1/2" | 1.5 - 10 | 5 - 40 | 5 - 60 | 15 - 100 | 30 - 200 |
| D | 3/4" | .5 - 6 | 3 - 25 | 5 - 40 | 10 - 80 | 15 - 120 |
| E | 3/4" | 1.5 - 10 | 5 - 40 | 5 - 60 | 15 - 100 | 30 - 200 |
| F | 3/4" | 2 - 15 | 5 - 60 | 20 - 150 | 30 - 200 | 40 - 300 |
| G | 3/4" | 3 - 20 | 10 - 80 | 30 - 200 | 40 - 300 | 50 - 400 |
| F | 1" | 2 - 15 | 5 - 60 | 20 - 150 | 30 - 200 | 40 - 300 |
| G | 1" | 3 - 20 | 10 - 80 | 30 - 200 | 40 - 300 | 50 - 400 |
| H | 1" | 4 - 30 | 15 - 120 | 40 - 300 | 60 - 500 | 50 - 600 |
| I | 1" | 5 - 40 | 20 - 150 | 50 - 400 | 50 - 600 | 100 - 800 |
| H | 1½" | 4 - 30 | 15 - 120 | 40 - 300 | 60 - 500 | 50 - 600 |
| I | 1½" | 5 - 40 | 20 - 150 | 50 - 400 | 50 - 600 | 100 - 800 |
| J | 1½" | 5 - 60 | 30 - 240 | 50 - 600 | 150 - 1000 | 150 - 1000 |
| K | 1½" | 15 - 100 | 50 - 400 | 100 - 800 | 150 - 1200 | 300 - 2000 |
| I | 2" | 5 - 40 | 20 - 150 | 50 - 400 | 50 - 600 | 100 - 800 |
| J | 2" | 5 - 60 | 30 - 240 | 50 - 600 | 150 - 1000 | 150 - 1000 |
| K | 2" | 15 - 100 | 50 - 400 | 100 - 800 | 150 - 1200 | 300 - 2000 |
| L | 2" | 20 - 150 | 50 - 600 | 150 - 1000 | 200 - 1500 | 400 - 3000 |
| M | 2" | 30 - 200 | 100 - 800 | 150 - 1200 | 300 - 2000 | 500 - 4000 |
| J | 2½" | 5 - 60 | 30 - 240 | 50 - 600 | 150 - 1000 | 150 - 1000 |
| K | 2½" | 15 - 100 | 50 - 400 | 100 - 800 | 150 - 1200 | 300 - 2000 |
| L | 2½" | 20 - 150 | 50 - 600 | 150 - 1000 | 200 - 1500 | 400 - 3000 |
| M | 2½" | 30 - 200 | 100 - 800 | 150 - 1200 | 300 - 2000 | 500 - 4000 |
| M | 3" | 30 - 200 | 100 - 800 | 150 - 1000 | 200 - 1500 | 500 - 4000 |
| N | 3" | 40 - 300 | 150 - 1000 | 300 - 2000 | 400 - 3000 | 500 - 6000 |
| O | 3" | 50 - 400 | 200 - 1500 | 400 - 3000 | 600 - 5000 | 1000 - 8000 |
| P | 3" | 50 - 500 | 300 - 2000 | 500 - 4000 | 500 - 6000 | 1500 - 10000 |
| Scale | Size | GPM | LPM | SCFM | Nm³/m | Lbs/Hr |
| N | 4" | 40 - 300 | 150 - 1000 | 200 - 1500 | 6 - 50 | 500 - 6000 |
| O | 4" | 50 - 400 | 200 - 1500 | 400 - 3000 | 15 - 100 | 1000 - 8000 |
| Q | 4" | 50 - 600 | 300 - 2400 | 600 - 5000 | 20 - 150 | 1500 - 10000 |
| R | 4" | 100 - 800 | 400 - 3000 | 500 - 6000 | 30 - 200 | 2000 - 15000 |
| N | 5" | 40 - 300 | 150 - 1000 | 200 - 1500 | 6 - 50 | 500 - 6000 |
| O | 5" | 50 - 400 | 200 - 1500 | 400 - 3000 | 15 - 100 | 1000 - 8000 |
| Q | 5" | 50 - 600 | 300 - 2400 | 600 - 5000 | 20 - 150 | 1500 - 10000 |
| R | 5" | 100 - 800 | 400 - 3000 | 500 - 6000 | 30 - 200 | 2000 - 15000 |
| Q | 6" | 50 - 600 | 300 - 2400 | 400 - 3000 | 15 - 100 | 1500 - 10000 |
| R | 6" | 100 - 800 | 400 - 3000 | 600 - 5000 | 20 - 150 | 2000 - 15000 |
| S | 6" | 150 - 1000 | 500 - 4000 | 1000 - 8000 | 30 - 250 | 3000 - 20000 |
| T | 6" | 300 - 2000 | 1000 - 8000 | 2000 - 15000 | 50 - 400 | 5000 - 40000 |
| Q | 8" | 50 - 600 | 300 - 2400 | 500 - 5000 | 15 - 150 | 1500 - 10000 |
| S | 8" | 150 - 1000 | 500 - 4000 | 1000 - 8000 | 30 - 250 | 3000 - 20000 |
| T | 8" | 300 - 2000 | 1000 - 8000 | 2000 - 15000 | 50 - 400 | 5000 - 40000 |
| U | 8" | 400 - 3000 | 1500 - 12000 | 3000 - 20000 | 50 - 600 | 5000 - 60000 |
Note: Non-Standard Flow Rates are available in up to 3 connection sizes below the standard scale of the connection size required. Please contact our Sales Dept. for pricing and to order.
Options and Application Notes
Options
- EPR, Viton®, Teflon® Seals
- 350°F, 400 PSIG (120°F Max for Digital Meters)
- LPM, SCFM, Nm³/H, Lbs/HR Scales
- Factory Calibration for Stable Specific Gravities other than 1.0
- Factory Calibration for Stable Viscosities under 500 cP
- Non-Standard Flow Rates
- Aluminum Housing with Plastic or Glass Crystal
- 4-20mA Output Signal
- Saturated Steam Service (120 PSIG Max.)
- Compressed Gas Service
- Ammonia Service
- Custom Scales (including Dual Scales)
- Peak Flow Indicator Dial
- Remote Readouts
- Panel Mount Meter Case (1½” or smaller only)
- 1 or 2 Reed switches SPDT
- Two Set Point Relays (High/Low)
- Cleaning for Oxygen Service
- 24VDC Power Supply
- NIST Calibration Certificates 4 to 200 GPM Full Scale up to Size 3″ (at time of order)
- Expedited Shipping (please contact our Sales Dept.)
- BSP Connections in Bronze or Stainless Steel
Application Notes
- Saturated Steam Service: Acceptable when configured for Saturated Steam Service (Max 120 PSIG)
- Potable Water: Not acceptable
- Vacuum Service: Not acceptable
- Gaseous Service: Acceptable when configured for Gases
- Installation: 10 pipe diameters of straight pipe required Upstream, No requirements downstream. Keep medias from freezing at all times in meter. Do not subject meter to water hammer. These Digital Meters require 24VDC power. We recommend that they are installed by an experienced installer or electrician.
- 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.
ORDERING REQUIREMENTS FOR METERS IN NON-WATER APPLICATIONS
For Liquids Please Specify
- Body Material: Bronze, 316SS, or Monel
- Seals: Buna-N, Ethylene Propylene, Viton®, or Teflon®
- Connection Size: 1/2″ to 8″
- Flow Range: See Scale options
- Flow Direction:
- Horizontal Left to Right
- Horizontal Right to Left
- Vertical Up mounted on Left or Right
- Vertical Down mount on Left or Right
- Media: If other than Water
- Pressure: Between 10 PSIG to 400 PSIG
- Temperature: Between -80 to 350°F
- Specific Gravity: At normal operating temperature (If under .95 S.G. or over 1.05 S.G.)
- Viscosity: At normal operating temperature (If over 5 cP)
For Gases Please Specify
- Body Material: Bronze, 316SS, or Monel
- Seals: Buna-N, Ethylene Propylene, Viton®, or Teflon®
- Connection Size: 1/4″ to 8″
- Flow Range: See Scale options
- Flow Direction:
- Horizontal Left to Right
- Horizontal Right to Left
- Vertical Up mounted on Left or Right
- Vertical Down mount on Left or Right
- Gas: Name of gas
- Pressure: Specify one specific or average pressure between 10 PSIG to 400 PSIG at meter inlet
- Temperature: Specify one specific or average temperature between -80 to 350°F at meter inlet
- Saturated Steam: Specify one specific or average pressure between 10 PSIG to 120 PSIG at meter inlet
Meter Head Mounting Options
Model Number Matrix
