Pura Pure Gas Dew-Point Transmitter / On-Line

Pura is a small, rugged, self-contained hygrometer transmitter designed specifically for the measurement of trace moisture content in ultra high purity gases used for semiconductor manufacturing, fiber optic production, optical ciating processes and pure gas production

Simple to use and install, Pura is available in 2-wire, 3-wire and hazardous area versions with VCR process connections and optional display/alarm units. It is fully configurable to meet specific needs.

Product Features

  • Measurement range down to -120°Cdp (-184°Fdp) (1ppbV)
  • Stable and repeatable measurement
  • Analog and digital output
  • Simple installation
  • VCR process connections
  • Optional display / alarm unit
  • Compact design
  • Fast response
  • Optional Hazardous Area Approval
  • Service exchange program

Technical Specification

Sensor Type Michell Advanced Ceramic Moisture Sensor
Range -120 to -40°Cdp (calibrated from -100 to -40°C)
(-184°F to -40°Fdp calibrated from -148 to -40°F)
Accuracy ±1°C from -40 up to -60°Cdp (-40 up to -76°Fdp)
±2°C from -60 up to -100°Cdp (-76 up to -148°Fdp)
±4°C from -100 to -120°Cdp (estimated) (-76 up to -148°Fdp)
Operating Pressure Minimum 10-7 Pa (10-9 torr)
Maximum 24 MPa (240 barg)
Operating Temperature -40 to +60°C (-40 to +140°F)
Flow Rate 1 to 5 Nl/min (2.11 to 10.59 scfh)
Power Nominal 24 V DC, 10-28 V DC maximum current 25 mA 2 or 3-wire configuration
Output PUR-TX-2W: 4 to 20mA 2-wire
PUR-TX-3W: 4 to 20mA 3-wire
PUR-AOL-SEN only: Digital String (RS485)
Cable with Display PUR-OL & PUR-IS-OL: 2m (standard) (6.56ft) / 5 or 10m (16.4 or 32.8ft) (optional)
PUR-AOL: 2m (standard) (6.56ft) / 5 or 10m (16.4 or 32.8ft) (optional)
Sensor Block Premium and OEM version: Cold drawn stainless steel, 0.1 - 0.2 Ra µm electro-polished internal finish
Pressure Connections Premium and OEM version: ¼" male VCR connection
Pura Sensor version: ½" male VCR connection
Installation Profile Premium and OEM version: 120mm (4.72in) pitch, drop in across gas port face seals
Zero pipe clearance required
2 off M4 x 0.7, 7mm (0.03, 0.28in) deep mounting holes in block, diagonally opposed
    at 20 x 20mm (0.79 x 0.79in) pitch
Pura Sensor version: fits into user's ½" VCR configured port
Overall Dimensions Premium and OEM version: 120 x 35 x 150mm (4.72 x 1.38 x 5.9in) (w x d x h)
Pura Sensor version: 132 x Ø35mm (5.2 x Ø1.38in)
Weight Premium and OEM versions: 450g (0.99lb)
Pura Sensor version: 180g (0.4lb)
Packaging Pura Premium: Double bagged and sealed in UHP inert gas
Pura OEM & Pura Sensor: Single bagged in 1000 gauge polythene
All options: shipped individually in profiled sponge protection and carton
Pura Sensor version supplied with protective guard over sensor surface for transportation and handling
Service Exchange Available on the Pura Sensor (SEN) ½" VCR connection
MonitorsAdvanced Online Monitor: PUR-AOLOnline Monitor: PUR-OL
Measurement Units °F, °Cdp; ppmV and ppbV with user-selectable range and resolution Simple display defined by 2-wire sensor input
Secondary measurement variable Pressure via external transducer 0-30 MPa (300 variable barg/4351 psi)
Completely user-configurable for any industry standard transducer
Automatic compensation for ppmV and ppbV
ppmV with no line pressure correction input available with PUR-TX-2W & PUR-IS-2W
Power Supply Universal 85 to 265 V AC; 95 to 370 V DC 100 to 240 V AC (+10, -15%) 50/60 Hz
Ingress Protection IP54 (NEMA 12); IP66 (NEMA 4X) for front panel only with optional cover IP65 front panel (IP20 rear panel)
Operating Temperature 0 to +50°C (+32 to +122°F) 0 to +50°C (+32 to +122°F)
Relays 2 off 10 A / 240 V c/o fully user-configurable: can accommodate full range for selected engineering unit + sensor fault alarm functions Alarm 1 relay: single pole make contact, rating 3 A @ 250 V AC
Alarm 2 relay: changeover contacts, rating 5 A @ 250 V AC
Display Resolution 5 Digit 4 Digit
Outputs: Analog 4-20 mA fully user-configurable and scaleable for range 0-20 or 4-20 mA fully user-configurable and scaleable for range
Outputs: Digital RS232: provides 2-way communication - full data access to user and total availability of all set-up options RS232: provides 2-way communication - full data access to user and total availability of all set-up options
Power Supply 18 to 36 V AC; 9 to 60 V DC 24 V DC
Relays 1 or 2 further 5 A relays (max 4 in total) n/o type fully user-configurable: can accommodate full range + full unit choice + sensor fault alarm functions 1 further optional relay - refer to factory
Outputs: Analog 0-10 V fully user-configurable and scaleable for range 0 to 10 V output using 500 Ω shunt resistant
Outputs: Digital RS485


Semi-Conductor / Electronics

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