INDUSTRIAL DIGITAL FLOW METERS – STAINLESS STEEL
SERIES GPI-G2 Industrial Grade Digital Meters - 316 Stainless Steel 
(Was Model 31904S) (Was Model 31904HP) (Was Model 31904FL) (Was Model 31904TC)
Meter Type
Industrial Grade Digital Turbine Flow Meter, battery powered that displays rate of flow and totals.
How It Works
Magnetic pulses are picked up by a coil. The computer converts the pulses into a flow rate and totals.
Standard 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 (2) 1.5V AAA Alkaline Batteries (2-year life)
- Factory Calibration Certificate supplied with each meter
- Suitable for most chemicals: Ammonium, Plating Solutions, Fuel products, Water, and Brewing & Distillery Processes
- 1 Year Limited Warranty
| Meter Body Size | |||||
|---|---|---|---|---|---|
| 1/2" | 3/4" | 1" | 1-1/2" | 2" | |
| CONNECTIONS | |||||
| NPT (Female) Size (Standard) | 1/2" | 3/4" | 1" | 1-1/2" | 2" |
| 150Lb ASME Flanged Size | - | - | 1" | 1-1/2" | 2" |
| Tri-Clamp Size (1 size larger than body) | 3/4" | 1" | 1-1/2" | 2" | 2-1/2" |
| FLOW RANGES | |||||
| Standard | 1 - 10 GPM (3.8 - 37.9 LPM) | 2 - 20 GPM (7.6 - 75.7 LPM) | 5 - 50 GPM (18.9 - 190 LPM) | 10 - 100 GPM (38 - 380 LPM) | 20 - 200 GPM (76 - 760 LPM) |
| Extended | 10 - 15 GPM (37.9 - 56.8 LPM) | 20 - 30 GPM (75.7 - 113.6 LPM) | 50 - 75 GPM (190 - 284 LPM) | 100 - 150 GPM (380 - 568 LPM) | 200 - 300 GPM (760 - 1136 LPM) |
| ACCURACY (Of Reading) | |||||
| Meter Body with Display | ± 1.5% | ± 1.0% | ± 1.0% | ± 0.75% | ± 0.75% |
| Meter Body without Display | ± 2.0% | ± 1.5% | ± 1.5% | ± 1.0% | ± 1.0% |
| Extended Range With Display | ± 5% | ± 5% | ± 5% | ± 5% | ± 5% |
| REPEATABILITY | ± 0.1% | ± 0.1% | ± 0.1% | ± 0.1% | ± 0.1% |
| PRESSURE RATINGS | |||||
| NPT (Female) | 1500 PSIG (102 Bar) | 1500 PSIG (102 Bar) | 1500 PSIG (102 Bar) | 1500 PSIG (102 Bar) | 1500 PSIG (102 Bar) |
| NPT (Female) High Pressure | 3000 PSIG (207 Bar) | 3000 PSIG (207 Bar) | 3000 PSIG (207 Bar) | 3000 PSIG (207 Bar) | 3000 PSIG (207 Bar) |
| Flanged (With Local Display) | - | - | 255 PSIG @ 140°F | 255 PSIG @ 140°F | 255 PSIG @ 140°F |
| Flanged (With Remote Display) | - | - | 225 PSIG @ 250°F | 225 PSIG @ 250°F | 225 PSIG @ 250°F |
| Tri-Clamp | 150 PSIG | 150 PSIG | 150 PSIG | 150 PSIG | 150 PSIG |
| TEMPERATURE RATINGS | |||||
| With Local Display* | 0°F to 129/140°F (-18°C to 54/60°C) | 0°F to 129/140°F (-18°C to 54/60°C) | 0°F to 129/140°F (-18°C to 54/60°C) | 0°F to 129/140°F (-18°C to 54/60°C) | 0°F to 129/140°F (-18°C to 54/60°C) |
| With Remote Display | -40°F to 250°F (-40°C to 121°C) | -40°F to 250°F (-40°C to 121°C) | -40°F to 250°F (-40°C to 121°C) | -40°F to 250°F (-40°C to 121°C) | -40°F to 250°F (-40°C to 121°C) |
| PRESSURE DROP (At Full Std Capacity) | 7.5 PSIG (0.52 Bar) | 5.2 PSIG (0.36 Bar) | 9.8 PSIG (0.68 Bar) | 3.8 PSIG (0.26 Bar) | 4.7 PSIG (0.32 Bar) |
| MAXIMUM VISCOSITY | 100 cps | 100 cps | 100 cps | 100 cps | 100 cps |
| TYPICAL K-FACTOR | 2500 PPG / 660 PPL | 1100 PPG / 291 PPL | 565 PPG / 149 PPL | 215 PPG / 57 PPL | 100 PPG / 26 PPL |
| FREQUENCY RANGE | 42 - 420 Hz | 37 - 370 Hz | 47 - 470 Hz | 36 - 360 Hz | 33 - 330 Hz |
| RECOMMENDED STRAINER SIZE | 120 Mesh (125 Microns) | 120 Mesh (125 Microns) | 120 Mesh (125 Microns) | 35 Mesh (500 Microns) | 35 Mesh (500 Microns) |
| STRAIGHT PIPE REQUIREMENTS | |||||
| Minimum Upstream | 5" (127mm) | 7.5" (191mm) | 10" (254mm) | 15" (381mm) | 20" (508mm) |
| Minimum Downstream | 2.5" (64mm) | 3.75" (95mm) | 5" (127mm) | 7.5" (191mm) | 10" (254mm) |
| Desired Upstream | 10" (254mm) | 14" (356mm) | 20" (508mm) | 30" (762mm) | 40" (1016mm) |
| Desired Downstream | 5" (127mm) | 7.5" (191mm) | 10" (254mm) | 15" (381mm) | 20" (508mm) |
| WETTED MATERIALS | |||||
| Body | 316 Stainless Steel | 316 Stainless Steel | 316 Stainless Steel | 316 Stainless Steel | 316 Stainless Steel |
| Bearings | 96% Alumina Ceramic | 96% Alumina Ceramic | 96% Alumina Ceramic | 96% Alumina Ceramic | 96% Alumina Ceramic |
| Shaft | Tungsten Carbide | Tungsten Carbide | Tungsten Carbide | Tungsten Carbide | Tungsten Carbide |
| Rotor | PVDF | PVDF | PVDF | PVDF | PVDF |
| Retaining Rings | 316 Stainless Steel | 316 Stainless Steel | 316 Stainless Steel | 316 Stainless Steel | 316 Stainless Steel |
| Seals | N/A | N/A | N/A | N/A | N/A |
| CONN. TO CONN. LENGTH | |||||
| NPT (Female) | 4.2" (106.7mm) | 4.3" (109.2mm) | 4.5" (114.3mm) | 5.3" (134.6mm) | 6.3" (160mm) |
| 150 Lb Flanged | - | - | 6.75" (171.5mm) | 8" (203.2mm) | 9.5" (241.3mm) |
| Tri-Clamp | 5" (127mm) | 5" (127mm) | 5.5" (139.7mm) | 6.5" (165.1mm) | 7" (177.8mm) |
*Display rating for Safe Area is 140°F and for Intrinsically Safe is 129°F
For NPT 1500 PSIG, Flanged and Tri-Clamp Meters
Options
- Field programmable for Gallons or Liters
- Quarts, Cubic Feet, Barrels, Cubic Cent., Ounces
- Rates per Minute, Hour or Day
- PTFE O-Ring Seals
- N.I.S.T. Flow Certificate
Replacement Parts:
- See Series GPI-P317
For NPT 3000 PSIG Meters
Optional Accessories
- 4-20mA Output Module
- FM Approved Remote Display Kit (increases meter rating to 250°F)
- Pulse Access – Dust Cover for Remote Kit (provides digital open collector [NPN] output signal)
- Conditioned Signal Output Module
- Pulse Access Module
- 90° Display Adapter Kit (for vertical installations)
Alternate Meters:
Application Notes:
- Saturated Steam Service: Not acceptable
- Potable Water: Not acceptable. (See Series GPI- QSE)
- Vacuum Service: Not acceptable
- Gaseous Service: Not acceptable
- General Non-Suitable Services: Not acceptable for deionized (DI) ultra-pure water applications. Not suitable for medias with varying viscosities.
- 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
