Sparing, VFF
Spares for VFF Rotary Piston Flowmeters
Provide a serial or project number, and we can locate the spares code for any VFF meter. Sometimes, just a tag number is sufficient. Sizes range from LF03, LF05, LF15, MF30, VFF4, VFF8, to HF20 and bigger. We can locate old or new designs that might be particularly special and seemingly unavailable.
An original calibration certificate provides the flow range, meter performance, and clues to mechanical and electrical parts. Most had replacement rotors or pressure-balanced chambers.
Positive Measurement can provide sensors that replace or improve on the original. Sensor selection is relatively simple, and we can help confirm the type and setup instructions.
Replacement parts for VFFs
The VFF is designed to be modular, which offers a significant advantage: it can be upgraded. Upgrades may include adjustments to flow ranges, enhancements in accuracy, or changes in materials. Additionally, by using different instrumentation, the Hazardous Area specification can be modified from Exi to Exd or vice versa. This flexibility is particularly beneficial when repurposing a meter.
As flow rates change over time, the ability to recalibrate the PBC or replace it extends the lifespan of the meter, its instrumentation, and its cabling. The PBC can be sent back for refurbishment or calibration and can also be replaced with new components.
This typically includes a new rotor and sensor, as needed.
Sensors for Rotary Pistons
Typical Spares Codes
Did you know there were 5 generations of sensor used on these Rotary Piston meters?
Before they were used in Oil and Gas applications, the reeds were potted in place once they had been set up to provide even pulses (RC). The Reed Holder was followed by the Reed Lift system (RH & RL). The most popular, and simplest in some respects, was the M6, which utilised an M6 gland to hold the sensor at the correct position. Since 2015, most have been supplied with the CIFM sensor (shown above).
- RC covers serial numbers VFF101 to VFF437
- RH VFF335 to VFF396
- RL VFF212 to VFF892
- M6 VFF911 to VFF4594 et al
- CIFM from VFF4593 to the present day
RC was mounted in a PVC or SS cylinder with a typical spares code containing ‘RC’. The calibration certificate would inform the number of active and spare reeds. RC would also appear in either the stock code or description.
The RH and RL were quite similar. A PCB enabled the selection of which reed(s) were engaged. There was a mechanism to tune the sensor to provide an even mark-space ratio. e.g: REEDHLIFT40X
M6 sensors almost always deployed a single sensor – spares stock code SENSORLF5-10GX.
With the advent of the CIFM system, the sensor was housed in a plastic or stainless steel housing with one or two active parts. The latter was used when reverse flow detection was enabled. There were just two lengths, usually related to the pressure rating of the VFF.
- CIFM-2RSSENSORX (shown on the left) or
- CIFM-2RSSENSORLARGEX
A serial number is the quickest way to identify what you have.
Spare rotors:
Rotary piston rotors are available in a variety of sizes/flow ranges and a variety of materials. Wider and/or non-standard flow ranges might change the construction or the calibration.
Call us for advice on swapping rotors or pressure-balanced chambers.
Typical codes: VFFROTMF30FC2.5, CIFM-VFFROTLF03TIPVD
Spare chambers:
Rotary piston pressure-balanced chambers are available in various sizes/flow ranges and various materials. Wider and/or non-standard flow ranges might change the construction or the calibration.
Call us for advice on swapping rotors or pressure-balanced chambers.
Typical codes would include the three characters: PBC, e.g. VFF4PBCXCARBROTHAST, CIFM-LF03PBCPVDPX
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