C264 – Flow Rate – Pulse Output Meter
Description
This calculates the flow rate for pulse output based meters.
References
Kelton calculation reference C264
KIMS calculation reference K206
Kelton calculation C244 – Calibration Correction
Kelton calculation C248 – Gas Flow Rate Conversion from Qv
Kelton calculation C261 – Gas Flow Rate Conversion from Qm
Kelton calculation C262 – Liquid Flow Rate Conversion
Options
Factor Type
- Meter Factor
- K-Factor
This option is used to select the whether a meter factor will be applied to the flow rate calculation. Note that K-factor will always be an input.
Meter Type
- Volume
- Mass
This option is used to select whether physics of the meter in question infers mass or volume flow rate from its direct outputs.
Fluid
- Gas
- Liquid
This option is used to select whether the fluid being metered is a liquid or a gas.
Ctsm
- Not applied
- User entered
- Calculated
This option is used to select whether a correction for temperature on the steel of the meter is made and whether this correction is user entered or calculated.
Cpsm
- Not applied
- User entered
- Calculated
This option is used to select whether a correction for pressure on the steel of the meter is made and whether this correction is user entered or calculated.
Interpolation Factor
- Apply
This option is used to apply an interpolation factor.
Calibration Correction
- Apply
This option is used to apply a calibration correction using C244.
Spool Temperature Coefficient
- Cubic
- Linear (Approximate)
- Linear (Full)
This option is used to select the temperature coefficient applied for the Ctsm calculation is linear or cubic.
Calculation
Correction for temperature on steel of meter
The Ctsm is calculated by:
| Where | ||
|---|---|---|
| αsp | = | Meter temperature coefficient |
| Tsp | = | Meter temperature |
| Trf | = | Meter reference temperature |
Correction for pressure on steel of meter
The Cpsm is calculated by:
| Where | ||
| λsp | = | Meter pressure coefficient |
| Psp | = | Meter pressure |
| Prf | = | Meter reference pressure |
Flow Rate
The flow rate, observed volume or mass, is calculated by :
| Where | ||
| IntF | = | Interpolation factor |
| MF | = | Meter factor |
| f | = | Frequency |
| KF | = | K-factor (Will be pulses per volume or pulses per mass depending on whether output flow rate is volumetric or mass based) |
| Ctsm | = | Correction for temperature on steel of meter |
| Cpsm | = | Correction for pressure on steel of meter |
Note that correction factors are set equal to one if they are not required for the calculation of flow rate.