Mass Flow Controllers & Meters

model

PCU–Gas Flow Portable Calibration Unit

Portable flow calibration with a very wide dynamic range

When a single flow meter won’t cover all of your calibration needs, consider using a portable calibration unit (PCU). Alicat’s PCU is a secondary calibration standard that combines up to 3 high-accuracy flow meters of varied ranges (max 1500 slpm) with totalizers into a rugged industrial carrying case for go-anywhere portability. PCU’s can be powered by two 9-volt batteries or the included AC cable and include a copy of Alicat’s Flow Vision SC™ software.

  • Versatile. Quickly calibrate multiple instruments across a combined turndown range of up to 1,000,000:1 (for example 1 sccm – 1000 slpm) with easy push-connect fittings or optional compression fittings.
  • Accurate. Measure live flow rates and flow totals with NIST-traceable accuracy (0.4% reading + 0.2% full-scale range) for a variety of gases down to 1/200th of full scale, or define your own gas composition with COMPOSER™.
  • Rugged. The PCU houses the flow meters within a rugged hard case and can withstand drops if they should occur.

PCU’s are also available in our “Whisper” configuration with low pressure drop (PCUW series) and 316L configuration for use with corrosive gases (PCUS series).

Performance

  • Available ranges:
    • Choose any 3 flow meters with ranges up to 1500 slpm (PCU and PCUS) or 250 slpm (PCUW)
    • All flow meters include a flow totalizer
  • Turndown ratio: up to 1,000,000:1 (combined turndown from 3 instruments)
  • High-accuracy calibration, NIST-traceable (standard on PCU’s): +/- (0.4% of the reading + 0.2% of the full-scale range)
  • Repeatability: 0.2% of the full-scale range
  • Typical measurement response time constant: 5-10 ms
  • No warm-up time required

Operating Conditions

  • Compatible gases: 98 (PCU and PCUW) or 130 (PCUS) pre-loaded selectable gas calibrations; additional mixtures definable with COMPOSER
  • Operating temperature: -10°C to +60°C
  • Max internal pressure (static): 145 psig/160 psia (PCU and PCUS) or 45 psig/60 psia (PCUW)
  • Max differential pressure (inlet to outlet): 75 psid (PCU and PCUS) or 15 psid (PCUW)
  • Proof pressure: 175 psig (190 psia)
  • STP/NTP: user-selectable (defaults to 25°C & 1 atm STP/0°C & 1 atm NTP)

In the box

Model Variations 

  • Low pressure drop (PCUW)
  • Aggressive gases (PCUS, see below)

Corrosive Gases (PCUS series)

Instruments in the standard PCU are also available with an optional “S” configuration (PCUS) for use with corrosive gases. In this configuration, we upgrade the flow body and sensor to 316L stainless steel and the elastomers to FFKM.

Build Options

Part numbers below are just a few examples of PCU range combinations. Any 3 flow meters with ranges up to 1500 slpm may be included in a standard PCU. Alicat’s PCU series is suitable for use with non-corrosive gases.

PCU-0.5SCCM-10SCCM-1SLPM

PCU-10SCCM-500SCCM-20SLPM

PCU-100SCCM-2SLPM-20SLPM

PCU-100SCCM-10SLPM-100SLPM

PCU-100SCCM-50SLPM-500SLPM

PCU-10SLPM-50SLPM-1500SLPM

Part numbers below are just a few examples of PCU range combinations. Any 3 flow meters with ranges up to 1500 slpm may be included in a PCUS. Alicat’s PCUS series is suitable for use with corrosive gases.

PCUS-0.5SCCM-10SCCM-1SLPM

PCUS-10SCCM-500SCCM-20SLPM

PCUS-100SCCM-2SLPM-20SLPM

PCUS-100SCCM-10SLPM-100SLPM

PCUS-100SCCM-50SLPM-500SLPM

PCUS-10SLPM-50SLPM-1500SLPM

Part numbers below are just a few examples of PCU range combinations. Any 3 flow meters with ranges up to 250 slpm may be included in a PCUW. Alicat’s PCUW series is suitable for use with non-corrosive gases.

PCUW-0.5SCCM-10SCCM-1SLPM

PCUW-10SCCM-500SCCM-20SLPM

PCUW-100SCCM-2SLPM-20SLPM

PCUW-100SCCM-10SLPM-100SLPM

PCUW-100SCCM-50SLPM-250SLPM

PCUW-10SLPM-50SLPM-250SLPM

Calibration of multiple flow instruments

Alicat’s portable calibration units (PCU) combine three battery-powered flow meters of complimentary ranges in a single case, each with totalizer and NIST-traceable high-accuracy calibration to a primary flow standard. With three overlapping measurement ranges, the PCU is capable of a total turndown of a million to one, making this an extremely versatile instrument.

 

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