The INVALCO GTB is a 1" to 2" cartridge-style gas turbine meter. A single removable support captures the rotor and bearings from one side; the second support only conditions the flow and stays in place. The design tolerates occasional slugs of condensate or debris. The CD4MCu cast rotor runs on two sealed, pre-lubricated micro bearings, and replacement internals come fully calibrated, ready to install without special tools.
Key specifications
Flow range: 1" 1.1-22 ACFM (K approx. 6200 p/ACF); 1-1/2" 3.0-60 ACFM (2500); 2" 4.5-90 ACFM (1500); 20:1 turndown
Linearity / repeatability: +/-1.0% / +/-0.25% (based on gas specific weight of 1 lb/ft³; rangeability reduces at lower density)
Output: 100-1,100 Hz; approx. 100 mV at 100 Hz to 1.5 V RMS at 1,000 Hz
Overrange / pressure drop: 125% intermittent; 0.5 psi at 100% flow
Pressure rating: 1"-2" MNPT 2,000 psi; ANSI RF Class 150 275 psi, 300 720 psi, 600 1,440 psi (non-shock at 100 °F; others consult factory)
Temperature: -150 to 450 °F extended range (others consult factory)
Materials: 316L SS body; 316 SS flanges; CD4MCu rotor; 410/430 SS bearings
Installation: Vertical or horizontal
Certification: CRN 0D11071.2 (1" MNPT)
How to read the model code
Example: GTB 3 2 000 = male NPT, 2", NPT connection.
Body style: 3 = male NPT; 4 = ANSI RF flanged; 4R = ANSI RTJ flanged; 6 = grooved (Victaulic)
Meter size: 1 = 1"; 15 = 1.5"; 2 = 2"
Specific connection: 00 = 1/2" & 1.5" NPT or wafer; 000 = 1" & 2" NPT or wafer; 02 = 150# flanges; 07 = 300# flanges; 14 = 600# flanges
Order the pickup coil, cable and electronics separately; use a low-drag (sine) or RF (square wave) pickup
Bulletin errors to note: the temperature range is printed as "-150 °F to 450 °F (130 °C to 218 °C)" (the low end is about -101 °C); the intro says vacuum to 5,000 psi while the pressure table tops out at 2,000 psi (NPT); the ordering header says "Tungsten Carbide V-Cup Bearing" though the specifications list 410/430 SS sealed micro bearings; connection code 00 mentions a 1/2" size that is not offered; and the worked example is printed as "GT3/2000". Confirm with the factory. SSIN044 replaces former publication SSIT090.
Pricing and lead time are quoted per configuration. Send the model code (or your application details), product, flow range, and pressure/temperature to Flow Measurement Services for a quote. Specifications summarized from Smith Meter (INVALCO) bulletin SSIN044 Rev 0.0 (11/16); confirm current data with the factory before ordering.
Smith Meter (formerly FMC Technologies / TechnipFMC Measurement Solutions), now manufactured by Guidant. Flow Measurement Services supplies and services Smith Meter equipment.