Tri Gear Flow Meter
Tri Gear Flow meter
Tri-gear Flow meters are precise, reliable and rugged instruments for the volumetric flow of liquids in general industrial, petroleum and chemical applications that require high degrees of accuracy and repeatability. They operate on the Positive Displacement principle using advanced gear technology and offer a competitive alternative to their Oval Gear, Sliding Vane and Bi-Rotor alternatives.
Operation Principle
Liquid Passes into the single case measuring chamber and displaces two Trigears. Each rotation of a Tri-gear is proportional to a discrete unit of volume, in turn, the speed at which the gears rotate is directly proportional to flowrate. Reed and Hall Effect sensors mounted outside the pressure boundary detect the movement of the Tri-gears, thus allowing local or remote instruments to display flow total, rate of flow or facilitate batching applications.
Meters can be fitted with additional sensors to provide in phase or out of phase signals for applications such as bidirectional flow.
Benefits
- High Resolution Digital Output
- Wide Rangeability
- Bi-directional flow capability
- Digital or Analogue Outputs available.
- HART Output option
- Less slippage than oval gear meters.
- Smoother and quieter than Oval Gear Meters.
- Dual Output standard (reed and hall effect)
- Low Mass Tri-gears facilitate fast response time to step changes in flowrate.
Technical Specifications
| Model Prefix | TG008 | TG015 | TG020 | TG025 | TG040 | TG050 |
|---|---|---|---|---|---|---|
| Capacity Group | Small Capacity | Medium Capacity | ||||
| Nominal size (inches) | 8mm (3/8”) | 15mm (1/2”) | 20mm (3/4”) | 25mm (1”) | 40mm (1.5”) | 50mm (2”) |
| *Flow range – litres/min – US gal/min |
0.25 ~ 9.2 | 1-40 | 2 ~ 50 | 5 ~ 150 | 10 ~ 250 | 20 ~ 500 |
| 0.07 ~ 2.4 | 0.3 ~ 10.5 | 0.6 ~ 13 | 1.3 ~ 40 | 2.6 ~ 66 | 5 ~ 132 | |
| **Accuracy @ 3cp | ± 0.5% of reading | ± 0.25% of reading (15:1 turndown), ± 0.5% of reading (25:1 turndown) |
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| Repeatability | typically ± 0.01% of reading | |||||
| Temperature range | -20°C ~ +120°C (-4°F ~ +250°F), refer factory for lower & higher temperatures | |||||
| Maximum pressure (threaded meters) bar (PSI) | ||||||
| Aluminium Meters | 30 (440) | |||||
| 316 Stainless Steel meters | 34 (495) | 30 (440) | ||||
| High Pressure models | refer factory | |||||
| Electrical – for pulse meters (see below for optional outputs) | ||||||
| Output pulse resolution | Pulses/litre (pulses/US gallon) – nominal | |||||
| Reed Switch and Hall Effect | 670 (2546) |
77 (292.6) |
77 (292.6) |
33.5 (125.4) |
11.5 (43.7) |
6.5 (24.7) |
| High Resolution Hall / Quadrature | 1340 (5092) |
154 (585.2) |
154 (585.2) |
67 (254.6) |
23 (87.4) |
13 (49.4) |
| Reed Switch output | 30Vdc x 200mA max. (maximum thermal shock 10°C (50°F)/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 | |||||
| Physical | ||||||
| Protection class | IP66/67 (NEMA4X), integral ancillaries can be supplied Intrinsically Safe | |||||
| Noise generation @ maximum flow | - | 75db | ||||
| Dimensions | Refer datasheet | |||||
| Pressure drop chart | Refer datasheet | |||||
| Min. filtration – microns (mesh) | 75 microns (200 mesh) |
150 microns (100 mesh) | ||||
| Approximate shipping weights (basic threaded meter) kg | ||||||
| Stainless Steel | 2.2 | 3.0 | 3.0 | 4.0 | 9.0 | 12.0 |
| Aluminium | 1.0 | 1.5 | 1.5 | 2.0 | 4.0 | 6.0 |